Xpdf Tools v4.03 CHANGES

0.2 (95-dec-12)
---------------
First public release.


0.3 (96-jan-13)
---------------
LZW patent workaround.
Implemented inline images.
Fixed (mostly) disjoint polygon fills.
Added remote server stuff.
Added page number on command line.
Fixed problem with font encodings which caused character misalignment.
Fixed inverted CCITT decoding and inverted image mask drawing.
Now compiles under gcc 2.7.x (ignore those stupid 'unused parameter'
  warnings).
Many minor bug fixes and optimizations.


0.4 (96-apr-24)
---------------
Implemented DCT filter.
Implemented PostScript output; wrote pdftops program.
Implemented links.
Implemented font rotation -- I was wrong: X11R6 servers *do* support
  font rotation (by specifying a matrix in place of a size).
Added bindings for Home/End, Page Up/Down, arrow keys.
Added initialZoom resource and -z option.
Added geometry resource and -g option.
Fixed image size off-by-one bug.
Fixed bug where page content is reference to an array of streams.
Cleaned up uninitialized variables which were causing random problems
  on various platforms.
Manually skip whitespace before calling atoi() for startxref.
Replaced calls to XrmCombineFileDatabase() with calls to
  XrmGetFileDatabase() and XrmMergeDatabases() so it will work under
  older versions of X.
Fixed problem with reading multiple xref tables in updated PDF files.
Check for encryption and print appropriate error message.
Rudimentary dithering of images.
Fixed bug in CCITTFax filter (pass mode followed by horizontal mode).
Optimized drawImage() and drawImageMask().
Changed several things to ease porting:
  - changed '__inline' to 'inline' (to adhere to the ANSI standard)
  - surrounded interface/implementation pragmas with #ifdef _GNUC__
  - got rid of empty array initializer lists
  - moved Operator type definition from Gfx.cc to Gfx.h
  - renamed String, uint, etc.
  - ability to uncompress to file (NO_POPEN and USE_GZIP flags)
  - added definitions of XK_Page_Up/Down and XPointer for old versions
    of X
For VMS port:
  - use correct Xdefaults name for VMS, get rid of ltkGetHomeDir()
  - added '#include <stddef.h>' before all X includes
  - renamed files with multiple periods in their names
Fixed window resizing infinite oscillation bug.
Fixed problem with string-type (as opposed to stream-type) indexed
  color space lookup tables (which are used in inline images).
If an X font is not found, try smaller and then larger sizes (this is
  useful for old or broken X servers which can't scale bitmap fonts).
Added -rgb (color cube size) option.
Various minor bug fixes.


0.5 (96-may-23)
---------------
Fixed bug in LTKWindow which broke the remote server mode.
Fixed PostScript output:
  - doesn't seg fault if file is unwritable.
  - incorrect DSC comment - need colon in '%%Page:'.
  - use 'imagemask' command for masks.
  - output filters in the correct order.
  - Stream::isBinary() checks the next-to-bottom, not top, stream.
  - if page width > height, rotate it 90 degrees.
  - if page is larger than paper size, scale it down.
Set default MediaBox to 8.5" x 11" to deal with non-compliant PDF
  files which don't specify a MediaBox.
Added DEBUG_MEM stuff in gmem.c and gmempp.cc.
Fixed memory leaks:
  - LTKWindow didn't delete the LTKBox.
  - LinkAction needs a virtual destructor.
Use $(RANLIB) variable in goo/Makefile and ltk/Makefile.
Allocate image data after calling XCreateImage, using
  image->bytes_per_line -- works in 24-bit mode now.
DCTStream rounds width of rowBuf lines up to the next multiple of
  mcuWidth, so last MCU doesn't run off end of buffer.
Increase size of block (from 255 to 1024 bytes) read at end of file to
  search for 'startxref'.
Skip past garbage at start of file, look for '%PDF'.
Moved more compiler options out of Makefiles into Makefile.config.
Top-level Makefile uses '$(MAKE)' instead of 'make' for making
  subdirectories.
Space/PageDown/Next and Backspace/PageUp/Previous now moves to
  next/previous page if already scrolled to bottom/top of current
  page.


0.5a (96-jul-09)
----------------
[not a public release]
For PDF 1.2 (a.k.a. Amber, a.k.a. Acrobat 3) support:
  - look for trailer after first xref instead of at end of file.
Deal with font subsets by converting character names of the form
  'Cnnnn' to the appropriate character from the standard encoding.
Extract encoding from embedded Type 1 fonts.
Kludge to fill one-pixel thick polygons.
Changed X font encoding to use endash for hyphen (gets rid of too-long
  hyphens).
Handle Resources key in Pages dictionaries (needed for pstoedit
  output).
Fix comment handling in Parser (needed for pstoedit output).
Move Bezier curve conversion from GfxState to XOutputDev; look at
  flatness parameter in GfxState.
Change all of the path functions in XOutputDev (stroke, fill, clip) to
  use the same path transformation/conversion function.
Rewrote PostScript output driver as a subclass of OutputDev; removed
  duplicated code (ps_ functions) from Gfx.
Fixed bug in xref code with small (< 1024 bytes) PDF files.
Implemented BX/EX operators.
Added PDFDoc class.


0.6 (96-nov-12)
---------------
Add support for PostScript output to stdout (-) and to a command
  (|lpr); added -ps option and psFile resource.
Decryption is implemented but not included in the distribution due to
  legal restrictions: the decryption algorithm is a trade secret of
  RSA, Inc., and the U.S.A. still has bogus export controls on
  cryptography software.
Added .xpdfrc config file:
  - Added fontmap parameter: user can map PDF font names to X fonts.
  - Added fontpath parameter: search for Type 1 font if encoding is
    not in PDF file.
Incremental display: display is updated after every 200 commands.
Added forward and backward by-10-page buttons.
Links:
  - Implement links with "Launch" actions that point to PDF files.
  - Draw borders around links.
  - Handle links with named destinations.
  - GoToR links specify a page number instead of a page reference.
Optimizations:
  - Rewrote Stream to use buffering, and added lookChar() functions;
    rewrote Lexer to take advantage of this.
  - Use hash tables for name->code mapping in font encodings.
  - Made XOutputDev::doCurve() iterative, changed /2 to *0.5, and
    changed the flatness test.
Added file name to window title.
Implemented RunLength filter.
Implemented forms.
Convert ObjType to an enum.
Changed isDict("Pages") to isDict() (in Catalog.cc) to deal with
  incorrect PDF files.
Changed color selection so that very pale colors don't map to white.
Fixed bug in CCITTFax filter (multiple make-up codes).
In GString::clear(): need to set length to 0 before calling resize().
Base initial window size on first displayed page, not page 1; deal
  correctly with rotated pages.
Added ltkGetIntResource() and LTKApp::getIntResource().
PostScript output fixes:
  - Escape backslashes in strings.
  - When doing ASCII85 encoding, keep both chars of EOF marker ('~>')
    on same line.
  - Add extra line '%-EOD-' after image data streams; call wrapper
    functions for image and imagemask which look for this line -- this
    should fix the 'too much data in stream' bug.
  - Font tags can be reused for different fonts on different pages --
    so use font object reference (number/generation) instead.
Initialize character widths to zero (this caused crashes on OSF/1).
Handle image masks which go outside of pixmap.
Makefile.config changes:
  - Remove -o in C++ compile rule.
  - Add $(AR) variable.
Code which read char widths from font dictionary read all but the last
  width.
Add 'return 0;' to main() in xpdf and pdftops.
Allow fonts to use StandardEncoding.
Convert man pages to VMS help files.

0.7 (97-may-28)
---------------
Implemented FlateDecode filter (for PDF 1.2).
Basic xref table reconstruction for damaged files
New pdftotext program converts PDF to plain text.
Implemented menus in LTK; added a menu to xpdf.
Added open and save functions; allow xpdf to start without any PDF
  file.
Implemented text find.
Implemented text select/copy.
Change mouse cursor when it's over a link.
Embed Type 1 fonts in PostScript output.
Moved rotate functions to menu; added quit to menu.
Fixed stroke color bug in PostScript output (was using fill color
  instead of stroke color; this sometimes caused lines to be missing
  (white) in PostScript output).
Support Launch-type links -- pops up a dialog before executing
  anything.  Expects the A (action) dictionary to contain a Unix
  dictionary with F (file) and P (paremeter) keys just like the Win
  dictionary.
A moveto op all by itself should just be discarded, instead of
  generating a subpath with one point (this was causing seg faults).
Balanced parentheses in strings don't need to be escaped.
Tj operator in PostScript prolog didn't check for zero when dividing
  by length of string.
Implemented selection in LTK; TextIn widgets support dragging/copy/
  paste.
Handle font subsets that use hex character codes.
Added icon pixmap; added the XPMLIB and NO_XPM variables to
  Makefile.config.
Fixed subtle bug in use of horizontal scaling parameter (it affects
  only the width of drawn characters, not positioning done in text
  space).
Memory testing (with DEBUG_MEM):
  - gmalloc now fills memory blocks with garbage to catch unitialized
    fields.
  - gfree fills memory blocks with garbage to catch uses of freed
    blocks.
Handle image masks which go off the pixmap on the top and/or left.
Fixed inline functions which had two return statements (to make the
  HP, SCO, and other cfront-based compilers happy).
Fixed bug which caused seg faults when following a link to a different
  file (info in LinkGoto object was used after link was deleted by
  loadFile).
If page content is an array of streams, the streams are concatenated;
  objects and commands can span multiple streams.
If file open fails, try lower-casing and upper-casing the file name.
Commands should end when lexer sees a '/' character.
GString::append(char *, int) was broken.
Changed LTKScrollingCanvas redraw to be more efficient: copy as much
  as possible from window before copying from off-screen pixmap.
Ignore gs (set extended graphics state) operator.
Handle colorspaces (CalGray/RGB are treated as DeviceGray/RGB; the
  weird colorspaces are not yet implemented).
Named destinations (for links) can be strings as well as names; deal
  with the names tree in the catalog.
Clip to the page CropBox.
Added '-q' to gzip options (to suppress warnings, in case user has -v
  in GZIP env var).
Added 'include Makefile.config' to top-level Makefile.
Added INSTALL variable to Makefile.config; used in top-level
  Makefile.
Always initialize LinkDest left/bottom/top/right/zoom fields (bogus
  floating point values were causing crashes on Alpha).
Added Makefile.config options for Digital Unix (DEC compilers), HP-UX
  (HP compilers), SCO Unix, and Evans & Sutherland ES/OS.
Added flag to set stream mode in fopen call for VMS.
Rewrote Link module.
Pages with no contents shouldn't cause an error message.
In PostScript output: pdfImM needs to set fill color before doing
  imagemask.
If font doesn't specify character widths, use widths from built-in
  font, based on font flags.
Fixed LTK scrollbar to delay before repeating and to control the
  period between repeats.
Removed window/widget copy() methods (they were untested and unused).
Unknown filter types produce a single error message instead of a
  stream of errors.
Added a dummy target in top-level Makefile so making individual
  executables (e.g., 'make pdftops') should now work.
Added optional xpdf-flip.ltk with buttons on right side instead of
  bottom of window.

0.7a (98-feb-22)
----------------
Moved find command from menu to toolbar button ('f' key still works).
Support TrueColor visuals.
Added a -cmap option and a installCmap resource to install a private
  colormap.
Mouse button 2 pans the window.
Selecting a URI link now executes a configurable command (from the
  urlCommand resource).
Added a "link info" display which shows the URL or file for the link
  under the mouse.
Don't draw (or convert to PostScript) text drawn in render modes 3 and
  7 -- this is invisible text, used by Acrobat Capture; this text is
  still passed to the TextPage object so that selection works.
Recognize (and quietly ignore) marked content operators (BMC, BDC,
  EMC, MP, DP).
Recognize new color-setting operators (scn, SCN).
Added A4_PAPER option.
Embed external Type 1 font files (this currently only works with PFA
  files).
Added "-level1" option (in xpdf and pdftops) to generate Level 1
  PostScript.
Setup autoconf -- replaced Makefile.config.  Added SELECT_TAKES_INT
  flag, and use configure to autodetect (for HP-UX).
Fixed appendToPath() to behave reasonably when appending ".." to root
  directory.
Fixed array size in FlateStream::compHuffmanCodes() (was causing xpdf
  to crash under OSF/1).
ASCII85Stream, ASCIIHexStream, and DCTStream didn't check for EOF and
  could run past the end of the stream in damaged files.
Handle hex escapes (#xx) in names.  Still allow the name /# for
  backward-compatibility.
Check for NULL characters in encoding array in GfxFont.cc (was calling
  strcmp() with NULL which crashed under Solaris).
PageAttrs::PageAttrs() didn't initialize crop box boundaries.
Changed uses of lookup() to lookupNF() in XRef.cc.
Fixed type checking of operators which take a variable number of
  args.
Gfx::buildImageStream() doesn't need to check for parser (since I got
  rid of the bogus array-of-command thing).
XOutputFont matches on font reference instead of font tag (similar to
  PSOutputDev fix).
Fixed bug in position calculation for multi-char substitutions in
  XOutputDev.
Cleaned up local variables which hid class variables.
Optimized variable length decoding in CCITTFaxStream.
Set link border width to zero if Border dictionary entry is missing.
Throw away zero-length strings in TextOutputDev -- they don't have
  valid xMin/xMax values.
Swapped order of XLIBS and XPMLIB in xpdf/Makefile.
Deleted 'LTKApp::' in function declaration in LTKApp.h.
Changed '(XKeyEvent *)&event' to '&event.xkey' in LTKApp.cc.
Check that the link rectangle coordinates are in the correct order,
  and swap if necessary.
TextOutputDev didn't set text to NULL, which caused pdftotext to
  segfault if it couldn't open it's output file.
Fixed a hash table search bug in GfxFontEncoding::getCharCode().
Cleaned up colorspace code: rewrote GfxColorSpace and added
  GfxImageColorMap; cleaned up PSOutputDev::doImage.
Handle named colorspaces in images.
Correctly set the default color after a colorspace change.
Old setcolor operators now set the colorspace.
Fixed bug with uncompressed blocks in FlateStream.
Fixed bug with fixed Huffman code table in FlateStream.
Added hash table of X windows (for LTKWindow and LTKWidget) to LTKApp
  and replaced calls to XQueryTree with hash table searches -- this
  avoids a roundtrip to the server for each event and also fixes the
  problem where XQueryTree crashed if the window no longer existed
  (with leftover events from a destroyed window).  (Thanks to Yair
  Lenga for the suggestion.)
Create a new GC for selection -- xor black and white (instead of LTK
  foreground and background).
Fixed crash with blank lines in .xpdfrc.
Allow spaces in font descriptors in fontmap lines in .xpdfrc.
Check for bogus object number in XRef::fetch().
Use MacRomanEncoding for TrueType fonts that don't specify an
  encoding.
Certain PDF generators apparently don't include FontDescriptors for
  Arial, TimesNewRoman, and CourierNew -- set GfxFont flags
  appropriately.
Fixed a bug in width guessing in GfxFont -- sans serif and serif were
  swapped.
Rewrote XRef::readXRef() to avoid using a parser to read the xref
  entries.
Added NO_TEXT_SELECT option.
Ignore APPn/COM/etc. markers in DCT streams.
Replaced select() with XMultiplexInput() in LTKApp.cc for VMS.
Handle WM_DELETE_WINDOW protocol -- if you ask the window manager to
  delete the xpdf window, xpdf will exit cleanly; other
  windows/dialogs are simply closed.
Optimized DCT decoder; switched to integer arithmetic.
The "/Type /Annots" field in an annotation dictionary is optional.
Check for null nameTree in Catalog::findDest().
In XOutputDev, search user font map before default font map.
Added "normal" SETWIDTH parameter to all font descriptors in
  XOutputDev (some systems have a narrow-width Helvetica font).
Added FOPEN_READ_BIN and FOPEN_WRITE_BIN to support Win32.
Added a hack which allows better font substitution for some Type 3
  fonts.  Also allow character names of the form /nn and /nnn.
Added <strings.h> and <bstring.h> to LTKApp.cc (needed by AIX and IRIX
  for bzero() declaration for FD_ZERO).

0.80 (98-nov-27)
----------------
Support for some Japanese fonts (Type 0 fonts using the Adobe-Japan1-2
  character collection, horizontal only).
Added pdfinfo application.
Added pdftopbm application.
Added pdfimages application.
Added -papercolor option and .paperColor resource.
Fixed divide-by-zero problem in XOutputDev Type 3 font matrix kludge.
Font subset char names can be 'Bxx' as well as 'Cxx' and 'Gxx'.
Fixed bug in color space conversion in DCTStream filter (YCC->RGB was
  correct, YCCK->CMYK was broken).
Added XRef::getDocInfo() and PDFDoc::getDocInfo() to support pdfinfo.
Optimized GfxImageColorMap.
Lexer::getStream(), getPos(), and setPos() check for null stream.
Decryption code now does strings as well as streams.
ASCII85 decoder rounds short tuples up instead of down.
CropBox and MediaBox can be non-integers.
PostScript output:
  - Use a rectangle operator.
  - Call setpagedevice with page size.
  - Insert %%PageOrientation comments.
  - Add paper size flags (-paperw and -paperh) to xpdf and pdftops.
  - If HAVE_POPEN is not defined, and user tries to print to '|...',
    the PSOutputDev destructor tried to write to the PS file.
  - Added support for forms (pdftops -form).
Removed error messages for empty paths in stroke, fill, etc. operators.
Don't allow flatnesses less than 1 in XOutputDev (this speeds up
  rendering a little bit when there are lots of tiny curves).
Moved the font subset character name guessing from GfxFont to
  XOutputDev and TextOutputDev - now these files print correctly.
Cast argument to XFree() to XPointer; add XPointer definition where
  necessary (portability fixes).
Various minor VMS fixes.
Changes to configure script and Makefiles:
  - Print a warning if X is missing.
  - Use C++ when checking select() argument type (HP-UX).
  - Use 0 instead of NULL when checking select().
  - Default to gcc instead of c++.
  - Get rid of AC_C_INLINE -- this is meant for C, not C++.
  - Changed -USE_GZIP to -DUSE_GZIP.
  - Added ability to compile ouside of the source tree.
  - Added .cc.o rule to {goo,ltk,xpdf}/Makefile.in.
  - Added @LIBS@ to XLIBS in xpdf/Makefile.in.
  - In top-level Makefile.in: added '-' to clean commands; added
    distclean rule.
  - Create install directories.
  - Use INSTALL_DATA (instead of INSTALL) for man pages.
  - Changed xpdf-ltk.h rule to avoid leaving an empty file when
    ltkbuild fails.
  - Change things so that by default, ltkbuild is not built and
    xpdf-ltk.h is not rebuilt.
  - Use AM_PROG_CC_STDC to add compiler flags for ANSI C.
  - Modify autoconf's builtin macros to check for xlC.
  - Use Steve Robbins' smr_CHECK_LIB to test for pixmap library (Xpm)
    -- this should fix the problems on systems that have the library
    but not the include file.
  - Added better test for sys/select.h, sys/bsdtypes.h, strings.h,
    bstring.h.
  - New VMS make scripts from Martin P.J. Zinser.
  - Moved dependences into Makefile.in -- this gets rid of problems
    with 'cc -MM' (which is gcc-specific) and 'include Makefile.dep'
    (which isn't supported by all make implementations).  Also changed
    all non-system include files to '#include "..."' (from '<...>').
Tweaked the TextOutputDev heuristics slightly.
Modify Gfx to use a stack of resources -- this is necessary for Form
  XObjects, which can define their own local resources; also modified
  PSOutputDev to dump fonts used by forms.
Look for excessively large MediaBox (compared to CropBox) and shrink
  it to CropBox.
Minor fix to scrolling when dragging a selection.
Various patches for pdftex and Win32 support.
Deal with Separation colorspaces by using their alternate colorspace
  entry.
Added PBMOutputDev for pdftopbm application.
Added ImageOutputDev for pdfimages application.
Separated XOutputDev into LTKOutputDev + XOutputDev.
Added support for 1-D and mixed 1-D/2-D (Group 3) decoding to
  CCITTDecode filter.
Added resetImage(), getImagePixel(), and skipImageLine() to Stream
  class; used these in XOutputDev, PSOutputDev, and ImageOutputDev.
Implemented predictor for LZW and Flate filters.
In pdfImM1 in PSOutputDev prolog: div should be idiv.
Changed output from printUsage() function in parseargs to look nicer.

0.90 (99-aug-02)
----------------
Added Type 1/1C font rendering, using t1lib.
Added "backward" and "forward" buttons.
Added fit-page and fit-page-width zoom factors; replaced zoom-in and
  zoom-out buttons with a zoom popup menu.
Type 1C fonts are converted to Type 1 and embedded in PostScript.
Support vertical Japanese text.
Added Japanese text support (EUC-JP) to pdftotext.
Bumped PDF version to 1.3.  Added stub functions for ri and sh
  operators. (But there are still some missing 1.3 features.)
Added -raw option to pdftotext.
Minor changes to allow compiling under MS Visual C++ 5.0.
Top-level makefile: changed 'mkdir -p' to '-mkdir -p'.
Configure script: added X_CFLAGS to smr_CHECK_LIB(Xpm).
Added Xpm_CFLAGS to xpdf/Makefile.in (this is needed to get the -I for
  the xpm includes).
Rewrote code that handles font encodings; added support for Type 1C
  fonts.
In the setpagedevice dictionary in PostScript output - added a
  /Policies entry which tells the PS interpreter to scale the page to
  fit the available paper.
Changed PageUp behavior slightly: move to bottom (instead of top) of
  previous page.
TextPage used character's dx (width + char space) instead of just its
  width.
Read base URI from document Catalog (for URI-type links).
Minor change to configure script to avoid using 'unset'.
Fixed bugs in CropBox inheritance.
Fixed a bug in resource stack handling for form objects.
Display forms even if they have a missing/incorrect FormType.
Fixed a bug in stream predictors -- the predictor parameters (width,
  comps, bits) don't need to match the actual image parameters.
  Completely rearranged the predictor code.
Fixed PostScript output to correctly handle stream predictors.
Don't segfault on empty (zero-page) documents.
Added the xpdf.viKeys feature.
Added the ffi and ffl ligatures to XOutputDev and TextOutputDev.
Pdftotext and pdfimages now check okToCopy().
Added a '-q' flag to all programs (except pdfinfo) to suppress
  messages and errors.
Deal with DeviceN colorspaces by using their alternate colorspace
  entry.
Change PostScript output so setpagedevice is only called once, at the
  very beginning of the document (to avoid problems on duplex
  printers).
Changes to configure script and makefiles for DOS/DJGPP.
FontEncoding::getCharCode() looked for (code>0) instead of (code>=0).
Added keypad arrow keys, etc. to xpdf.
Minor changes to gfile.{h,cpp} (<windows.h>) to compile under VC++.
Fixed CCITTFaxStream to correctly handle all parameters.
Modifications to gfile.{h,cc} for Acorn.
Some minor changes for OS/2.
Added 'SHELL = /bin/sh' to Makefiles.
Compare file version to pdfVersionNum+0.0001 to avoid floating point
  precision problems.
Added LDFLAGS to Makefiles.
Removed strip entirely from configure and Makefiles.
Fixed a bug in choosing the correct DCTStream color transform.

0.91 (2000-aug-14)
------------------
Added TrueType font rendering, using FreeType.
Support for Chinese fonts (Type 0 fonts using the Adobe-GB1-2
  character collection).
Decryption code is included with the main distribution (now that the
  US export regulations are a little bit less irrational).
Added (very basic) support for generating PostScript with Japanese
  fonts -- only tested with ghostscript so far.
Added support for generating EPS files (pdftops -eps).
Much-improved image filtering in xpdf (for downsampling and for
  transforms other than 0/90/180/270-degree rotations).
Implemented a basic full-screen (presentation) mode (xpdf
  -fullscreen).  (There is currently no way to switch between window
  and full-screen modes on the fly -- this will be fixed in a later
  release.)
Added "reload" menu item.
Do a better job with anti-aliased Type 1 fonts on non-white
  backgrounds.
Handle Lab color spaces.
Handle non-null user passwords.
Avoid security hole with tmpnam()/fopen() -- added openTempFile() in
  goo/gfile.cc.  [Thanks to Joseph S. Myers for pointing this out.]
Filter out quote marks (' and ") in URLs before running urlCommand to
  avoid a potential security hole.  [Thanks to Frank Doepper for
  pointing this out.]
Fixed TrueColor detection to look at the complete list of available
  visuals, not just the default visual.
In gfile.h, changed NAMLEN(dirent) macro to NAMLEN(d).
Removed copyright character from start-up banners.
In the open and save dialogs, if the open/save button is pressed with
  no file name, the dialog is not canceled.
Added Xpm_CFLAGS to ltk/Makefile.
XOutputDev::updateLineAttrs was using dashLength before it was
  defined.
In top-level Makefile.in, use INSTALL_PROGRAM instead of INSTALL.
In man page, recommend -q instead of -err in .mailcap.
Changes for GNOME / Bonobo support:
  - Separated Stream classes into BaseStream and FilterStream trees.
  - Got rid of all FileStream-specific stuff.
  - Added a PDFDoc constructor that takes a BaseStream* instead of a
    file name.
Allow newlines inside strings (Photoshop does this).
Don't require whitespace between tokens in consecutive content
  streams (for pages that specify an array of streams).
Look at MissingWidth when constructing font character widths array.
Fixed a bug that caused incorrect PostScript output for images that
  use 8-bit indexed color spaces with < 256 colors in the palette.
Handle case where embedded font file is bad (this was seg faulting).
Minor changes for Windows/pdftex.
Work around a bug in PDF files from the IBM patent server.
Fixed bugs in PostScript form generation: use pdfStartPage instead of
  pdfSetup; problem with inline images.
Minor bug fix in FlateStream::loadFixedCodes().
Added %%DocumentMedia and %%PageMedia comments to the PostScript so
  that gsview (a Windows frontend for ghostscript) gets the right
  paper size.
Draw AcroForm fields that have appearance annotations.
Bounds check gray, CMYK, and RGB values (in GfxColor).
Moved the link border drawing code into Page (from PDFDoc).
Minor modifications for pdftohtml.
PSOutputDev: use the Type 3 font scaling kludge from XOutputDev.
Separation color spaces were handled incorrectly in images.
Fixed a bug with form bounding boxes.
Modified the t1lib support -- replace libt1x code with my own code.
  Type 1 and TrueType fonts are now handled similarly, and clipping
  works on Type 1 fonts.
Don't print copyright banner (xpdf); add -v switch to get copyright
  and version info (all apps); get rid of -err switch (xpdf).
Automatically reload the PDF file if it has been changed, i.e., if the
  modification time is different.
Fixed a memory (malloc size) bug in CCITTFaxStream.
Fixed two bugs in FontEncoding::hash() -- handle zero-length character
  names (which were found in a (buggy?) PDF file), and handle
  character names with high-bit-set characters (use unsigned ints).
Added PDFDoc::isLinearized() and corresponding code in pdfinfo.cc.
Handle files with an incorrect page count in the Pages dictionary
  (FOP, from the Apache project produces a page count of 0).
Handle TrueType equivalents to the Base14 fonts (Arial, TimesNewRoman,
  CourierNew) -- Adobe's tools use these names without embedding the
  fonts.
Tweaked the Type 3 font sizing kludge.
Changed pdfimages (ImageOutputDev) so it doesn't output JPEG files for
  4-component color spaces, since these seem to confuse most image
  viewers.
Added support for generating OPI comments (pdftops -opi).
In XOutputDev::drawImage() and drawImageMask(), check for images that
  are completely off-page.
Use the provided alternate or a default (DeviceGray/RGB/CMYK) color
  space for ICCBased color spaces.
Incorporated MacOS-specific code from Leonard Rosenthol.
Configure script switches to C++ for the strings.h/bstring.h test.
Gfx::opRestore() calls clearPath() to handle (apparently) buggy PDF
  files produced by FreeHand.
The /Type field in most dictionaries is optional (PDF 1.3 change).
Move printCommands variable definition into Gfx.cc.
If page is smaller than paper, center the PostScript output.
Fix a minor bug in the SELECT_TAKES_INT detection in the configure
  script.
TextOutputDev filters out control characters.
Changed enough occurrences of 'char *' to 'const char *' to keep gcc
  2.95 from barfing.
Support for Latin-2 and Latin-5 in pdftotext (however, this will only
  work if the PDF file contains correct font encodings, which seems to
  be rare).
TextOutputDev converts "eightoldstyle" to "eight", etc.
Don't use the return value from sprintf() -- most systems return the
  length, but some return the string.
Minor fixes for SunOS 4.
Configure script looks for both select() and fd_set in sys/select.h.
Configure script checks for gethostbyname() in -lbsd (for LynxOS).
Fix missing closepath bug in PostScript output.
Change PostScript portrait/landscape mode selection so it only uses
  landscape if the page width is greater than the paper width.
Tweaked the VMS code in makePathAbsolute().

0.91a (2000-oct-11)
-------------------
Implemented separable CMYK PostScript output (the -level1sep switch to
  pdftops).
Implemented Pattern color spaces with tiling patterns (polygon fills
  only).
Implemented Stamp annotations.
Implemented Named link actions.
Fixed a really dumb bug in the TrueColor code in SFont (which affects
  both Type 1 and TrueType font rendering on 16-bit displays).
Rewrote the GfxColorSpace / GfxColor code.
Switched from djgppcfg to dj_make.bat (from Michael Richmond).
Bug in the Type 1 encoding parser -- couldn't handle lines of the form
  'dup NNN/name put' (with no space between the code and the name).
Fixed the mkstemp() test in configure.in -- switched from
  AC_TRY_COMPILE to AC_TRY_LINK and added <unistd.h>.
Added DESTDIR to top-level Makefile.in.
Fixed an incorrect OPI comment in PSOutputDev.
Minor tweak to the CCITTFax code to avoid writing past the end of an
  array on an invalid data stream.
Xpdf crashed if the user selected 'reload' when no document was
  loaded.
Look for character names of the form "xx" (two hex digits with no
  leading alphabetic char) and 'cNNN' (decimal digits with a leading
  alphabetic char that happens to be a hex digit).
FlateStream didn't correctly handle zero-length streams.
Xref reconstruction didn't handle the case where the opening "<<"
  immediately followed "trailer" with no intervening whitespace.
Fix the %%DocumentSuppliedResources comment in EPS output.
Scale annotations to fit their rectangles.
Added Stream::close() to handle cases (e.g., patterns) where a Stream
  object is used multiple times before it is deleted.
Added the topLevel arg to Gfx::go() so it doesn't call out->dump() for
  every pattern element (and form).
Rearranged the GfxResources class.
Clean up white space handling in Lexer.
Make the dpi parameter to PDFDoc::displayPage etc. a double - this
  avoids margin gaps with fit-page and fit-width.
Fix a rounding problem in xpdf.cc that was causing the window to
  sometimes be one pixel too small.
Fixed a minor bug in dealing with Base-14 TrueType font names.
Fixed Lab -> RGB color space conversion.
Added support for opacity values (from PDF 1.4) to GfxState and
  OutputDev.  [Thanks to Leonard Rosenthol.]
Implemented type 2 functions; rearranged the Function class
  hierarchy.

0.91b (2000-oct-29)
-------------------
Print a warning about Type 3 fonts (XOutputDev, PSOutputDev).
Added the scroll lock behavior to 'n' and 'p' keys in xpdf.
Change FileStream buffer size to a #define'd constant.
Renamed Pattern to GfxPattern to avoid clashes with Windows and MacOS
  types.
Added CNS (Big5) Chinese font support (CHINESE_CNS_SUPPORT); renamed
  CHINESE_SUPPORT to CHINESE_GB_SUPPORT.

0.91c (2000-nov-19)
-------------------
Fix an endianness problem in the Type 1 font code which resulted in an
  incorrect display with "-t1lib plain" on big-endian systems.
CCITTFax stream decoder will skip over extra zero bits at end of line,
  even if EncodedByteAlign flag wasn't set.
Added Big5 support to pdftotext (with CHINESE_CNS_SUPPORT enabled).
Fixed a typo in the CNS/Big5 encoding translation table.
Change the form code in PSOutputDev to store images in arrays of
  strings.
The xref reconstruction (for damaged files) now also looks for
  'endstream' tags, and the parser uses this information when setting
  up stream objects.
In pdfinfo, convert Unicode chars in the 00xx range into 8-bit chars;
  print a warning if there are any other Unicode chars.

0.92 (2000-dec-03)
------------------
Fixed %%BeginResource comment (for xpdf procset) in PostScript
  output.
Added "-title" switch and "xpdf.title" resource to set the window
  title.
Check for <freetype.h> in addition to <freetype/freetype.h>.
Upgraded the configure script to smr_macros 0.2.4 - this should fix a
  bug where configure wasn't correctly finding t1lib.

0.92a (2000-dec-17)
-------------------
Added 'extern "C" { ... }' in various places for ANSI C++ compliance.
Tweaked the code that figures out DPI for fit-to-page and fit-to-width
  modes.
Fixed the image transformation code in XOutputDev -- no more missing
  lines.
Implemented color key image masking in XOutputDev.

0.92b (2001-jan-07)
-------------------
Fixed a bug in the error-checking code in the Separation/DeviceN color
  space parsing functions.  [Thanks to Lidia Mirkin.]
Added wheel mouse support (mouse buttons 4 and 5).  [Thanks to
  Thorsten Schreiner.]
Added preliminary support for FreeType 2 (disabled by default).

0.92c (2001-jun-04)
-------------------
Fixed a bug in the new image transformation code.
Look for character names of the form "<letter><digit><digit>", instead
  of looking for names beginning with a few specific letters.
T1FontFile::T1FontFile wasn't initializing vars, and ~T1FontFile
  wasn't checking before calling T1_DeleteFont -- this caused crashes
  if it tried to open a nonexistent font file.
Catalog::Catalog didn't set baseURI to NULL early enough.
Tweak the check for strings.h in the configure script.
Yet another fix for the image rotation code in XOutputDev --
  off-by-one problem when upsampling.
Handle Type 1/1C encodings when using FreeType 2.
Allow FreeType2 to render user-supplied Type 1 base fonts.
Opening a new file from full-screen mode tried to scroll.
Fixed a bug in GfxFont constructor (missing check for NULL base font
  name).
Don't crash if a Type 1 font's FontBBox is non-integer.
Pdfinfo prints page size.
Tweak for the alpha hack in T1Font/TTFont: sample the middle pixel
  instead of the top-left pixel.
Automatically activate the text input widget in the find window.
Changed a Japanese char code mapping in XOutputDev and TextOutputDev:
  period was being incorrectly mapped to small circle (end-of-sentence
  character).
Add the 0/+/-/z/w key bindings to control the zoom setting.
Fixed ImageOutputDev (pdfimages) to correctly handle inline image
  masks.
Extract ascent/descent info from font descriptor.

0.92d (2001-jun-26)
-------------------
Embed TrueType fonts in PostScript output.  (Added a "-noembtt" flag
  to pdftops.)
Extract encoding from TrueType fonts.
Moved Function classes to a separate file (Function.h/cc).
Implemented multi-dimensional sampled Functions.
Implemented Type 4 (PostScript calculator) Functions.
For Type 0 fonts, FontDescriptor is in descendant font, not parent.
  [Thanks to Lidia Mirkin.]
Added the "-htmlmeta" option to pdftotext.
In TextOutputDev, when computing the number of blank lines to insert,
  do a sanity check on the result.
If both FlateDecode and some other filter (e.g., DCTDecode) were
  applied to an image stream, getPSFilter() crashed instead of just
  returning NULL.
Handle the /Identity function.

0.92e (2001-aug-23)
-------------------
Widths in font dict should override built-in font widths.
Changed "rotate left/right" menu items to "rotate
  clockwise/counterclockwise".
The link parsing code choked if the Border array was incorrect (too
  short).
Modified PSOutputDev to output CMYK for fill/stroke colors.

0.93 (2001-oct-25)
------------------
Implement PDF 1.4 (128-bit) decryption.
Bump supported PDF version number to 1.4.
Text output for Simplified Chinese.  [Thanks to Cheung Siu Fai.]
Read an app-defaults file for Xpdf.
Read a system-wide config file (<prefix>/etc/xpdfrc) if ~/.xpdfrc
  doesn't exist.
Accept and verify owner password; if correct, allow all actions.
Added a "-level2sep" option to pdftops to generate Level 2 separable
  PostScript.  The PostScript separation convention operators are used
  to handle custom (spot) colors.  [Thanks to Thomas Freitag for help
  on this.]
Add support for FreeType 2 to the configure script.  Warning: this
  requires FT 2.0.5 or newer.
Fixed the bounding rectangle overlap test in the disconnected subpath
  fill hack in XOutputDev.
Stupid typo in font name table in PSOutputDev.
Changing the zoom setting with a keyboard shortcut didn't update the
  displayed setting.
Modified the mouse wheel support and added the second wheel (mouse
  buttons 6 and 7).  [Thanks to Michal Pasternak.]
Character and word spacing is affected by horizontal scaling (display
  and PS output).  [Thanks to Eddy Ng.]
Rotation specified by the text matrix, character spacing, and
  horizontal scaling interacted incorrectly (display and PS output).
Some broken Type 1/1C fonts have a zero BBox -- kludge around this by
  assuming a largeish BBox.
Handle PDF files with an incorrect (too small) xref table size.
Allow "-?" and "--help" as aliases for "-h" (all apps).
Correctly handle unescaped parens in strings in Lexer.
Fixed a bug in LTK where a menu got posted multiple times if you right
  clicked while a page was being rendered.
Removed a comma inside a string in configure.in.
Kludge around broken PDF files that use char 32 but encode it as
  .notdef instead of space.
Clean up various compiler warnings: use constructor args like "fooA"
  if there is a field named "foo".  Everything now compiles cleanly
  under gcc 2.91.66, 2.95.2, and 3.0.1.
Page objects now read all of the page rectangles (MediaBox, CropBox,
  BleedBox, TrimBox, ArtBox), as requested by the pdfTeX folks.
  Added a new PDFRectangle struct to hold these.
Use XOutputDev's Type 3 font size hack in TextOutputDev too, so it
  does a little better job of extracting text in Type 3 fonts.
Modify pdfimages to write one-bit images as PBM files.
Work around a bug in cygwin's implementation of fseek.

0.93a (2001-nov-21)
-------------------
Implemented the sh (shaded fill) operator for the axial shading type.
Minor fixes to avoid compiler warnings.
Cleaned up global variables -- moved many into instance vars and
  function args.
Minor fixes for OS/2.
Fix the system config file path for VMS.
Fix an uninitialized var in XOutputDev that caused crashes on Alphas.
Don't incrementally update the display in full-screen mode.
For Type 1/1C fonts, use the FontBBox from the PDF FontDescriptor
  (instead of the one in the font file) if present -- this avoids
  problems with fonts that have non-standard FontMatrixes.
Add the Euro character to WinAnsiEncoding.
Track the bounding box of the clip region to make rendering patterns
  more efficient.
Fix openTempFile() for Win32.

0.93b (2001-dec-11)
-------------------
Added a duplex option to PSOutputDev and a -duplex switch to pdftops.
Added XRef::PDFgetDocInfoNF() for pdftex project.
Updated the VMS build script.

0.93c (2001-dec-12)
-------------------
Completely rewrote the code that handles font encodings:
  - everything is Unicode-based
  - 16-bit fonts are handled much more cleanly
  - text output encoding can be set more flexibly
New .xpdfrc config files.

1.00 (2002-feb-01)
------------------
More work on the font encoding rewrite:
  - use the ToUnicode font dict entry
  - pdfinfo and pdftotext (with '-htmlmeta') convert info strings to
    the selected text encoding
Added key bindings for forward ('v') and backward ('b').
Added the pdffonts program which lists the fonts used in a PDF file.
Fixed several problems in the TrueType font embedding code (for
  PostScript output).
Accept named destination on command line.
Added several new items to pdfinfo: file size, PDF version, tagged
  (yes or no), XML metadata (with the -meta option).
Pdftops didn't get the portrait/landscape setting correct for PDF
  files with rotated pages.
The TrueTypeFontFile class (including the Type 42 converter) now
  understands cmap format 6.
Improved the "about" window -- mention the GPL, add a list of key
  bindings.
Added Zcaron and zcaron characters to WinAnsiEncoding.
The '0' keyboard shortcut didn't update the zoom popup menu.
Handle the complete list of alternate names for the Base14 fonts.
Fixed substitute font scaling in XOutputDev - scale only the width,
  not the height.
Implemented stitching (type 3) functions.
Handle the case of moveto/closepath/clip, which defines an empty
  clipping region.
Move dependences into separate Makefile.dep files; get rid of the
  distdepend target.
Move all of the configure-script-generated -D options out of the
  Makefiles and into a top-level .h file (aconf.h).
Cleaned up the FreeType 1/2 detection code in the configure script.
Pdfinfo prints dates in a more readable format.
Fixed a bug in the Paeth image predictor.
Handle annotations with multiple states.
Another workaround for buggy X servers: clip points that are way out
  of bounds.
Added libpaper support (for Debian).
Generate PostScript DSC resource comments for PS (not just EPS)
  files.
The save and restore (q/Q) operators shouldn't save/restore the path.
Performance optimization: disable pattern drawing in TextOutputDev.

1.00a (2002-feb-25)
-------------------
Added an optimized special case for one-bit images in XOutputDev.
Implemented CID TrueType font embedding; added a psEmbedCIDTrueType
  option.
The initialZoom X resource was broken.
The reverse MacRoman encoding should return 32 for "space" (not 202,
  which is an alternate encoding).
Tweaks to the FreeType 2 support: only disable hinting if the bytecode
  interpreter is disabled (i.e., disable autohinting but not bytecode
  hinting); add some padding to the glyph cache for CJK fonts.
Added level3 and level3Sep options for the psLevel setting and
  corresponding -level3 and -level3Sep options to pdftops.
Added a -level2 option to pdftops for consistency.
Avoid a divide by zero in pdftotext.  [Thanks to William Bader.]
Added a Greek language support package.  [Thanks to Alexandros
  Diamantidis and Maria Adaloglou.]
Don't bother trying to extract a "builtin" encoding from a TrueType
  font.
Accept either a page number or a page reference in a link
  destination.
Update the fontFixedWidth flag in GfxFont after reading the char
  widths (used by the Acorn RiscOS port).
Removed yet another (illegal but not caught by gcc) class specified
  from a .h file.
Avoid using snprintf - it's not available everywhere.
Improved the CMYK->RGB transform.
Use mkstemps where available.

1.01 (2002-may-20)
------------------
Implemented Type 3 fonts.
Implemented PostScript CID font embedding; added a
  psEmbedCIDPostScriptFonts option.
Implemented PostScript 16-bit font substitution; added psNamedFont16
  and psFont16 options.
Moved the initialZoom setting from X resources to the xpdfrc file.
Implemented the radial shading type in the sh (shaded fill) operator.
  [Thanks to Mike Sweet.]
Added an 'include' command to the xpdfrc format.
Added the displayNamedCIDFontX option so different fonts can be used
  within one character collection.
Added a simple reverse video mode (-rv switch, xpdf.reverseVideo
  resource).
Implemented stroked text in XOutputDev (with t1lib and FreeType2).
  [Thanks to Leonard Rosenthol.]
Implemented stroked text in PSOutputDev.
Added a built-in Unicode map for UCS-2.
New key binding in xpdf: 'g' activates the page number text field.
PSOutputDev will now embed external TrueType fonts in addition to
  external Type 1 fonts.
The psEmbedType1Fonts and psEmbedTrueTypeFonts options were missing
  the "Fonts" suffix.
Documentation in xpdf.1 for -freetype option was wrong.
Added the Big5ascii Unicode map to the Chinese-traditional support
  package (maps 7-bit ASCII straight through).  [Thanks to Lawrence
  Lai.]
Modified the EUC-CN and EUC-JP encodings to pass 7-bit ASCII straight
  through.  [Thanks to Lawrence Lai.]
Avoid a divide by zero in XOutputDev.  [Thanks to Simon Burge.]
Remove old code in openTempFile that removed an extension from the
  name returned by tmpnam.
Tweak the scrolling behavior when switching pages.  [Thanks to Case
  Jones.]
In the code that guesses character names (for font subsets), also
  handle names of the form 'ABnnn'.  [Thanks to Colin Granville.]
Fix the transform code for annotations.
Improved the CMap file parser to handle more general PostScript
  lexical conventions.
Added '-enc' option to pdfinfo.
Added the small caps and oldstyle numbers from Adobe's Unicode
  corporate use area to the Latin1 and ASCII7 Unicode maps.
The code in TextOutputDev that guesses Type 3 font size could generate
  a zero size, which resulted in div-by-zero errors.
Various tools (including Adobe's) occasionally embed Type 1 fonts but
  label them Type 1C - so check for a '%!' at the start.
Some tools embed Type 1C fonts with an extra whitespace char at the
  beginning - just skip over it.
Fixed a typo in the Simplified Chinese add-to-xpdfrc file.
Updates to dj_make.bat and the djgpp build instructions.
Added a Turkish language support package.
Updated VMS build scripts.  [Thanks to Martin Zinser.]
Modify the incremental display update code to redraw less often if
  most of the commands are vector graphics, as opposed to text and
  images.
Tweak the Type 1 font bbox code to look at the bboxes in both the PDF
  font object and the embedded font file.
Fixed the ETenms-B5-H CMap file (for traditional Chinese) to map the
  Latin characters to their proportional versions.
Added an optional displayCIDFontX entry for one of the Arphic TrueType
  fonts in the traditional Chinese 'add-to-xpdfrc' file.
Remove leading '-' on include statements in Makefiles.
Added psASCIIHex parameter.
Added the GBK Unicode map to the simplified Chinese language pack.
Pdftotext now opens the text file in binary mode to avoid Microsoft's
  annoying automatic end-of-line translation stuff.
Added an executeCommand function in goo/gfile.cc.  [Thanks to Mikhail
  Kruk.]
The %ALDImagePosition OPI comment was wrong if the page was scaled to
  a different paper size.
The OPI code was saving the default transform matrix before calling
  setpagedevice, which can change the matrix.
Fixed a crash when an inline image dictionary contains garbage.
Upgraded to autoconf 2.53.
Use unsigned int file offsets, to allow access to PDF files in the 2-4
  GB size range; use fseek64/ftell64 if available.
Fixed two floating point exception cases that came up with broken PDF
  files.
Avoid a crash when printing an error message regarding an unnamed
  font.
Default link border width should be 1.  [Thanks to Michael Pfeiffer.]
Minor tweak to build with FreeType 2.1.0.
Handle "weird" characters in PostScript font names.
PSOutputDev now handles PostScript XObjects.
Added several more page attributes for the pdftex project.
Transferred the copyright to Glyph & Cog, LLC.

2.00 (2002-nov-04)
------------------
Switched to the Motif toolkit.
Support multiple open documents (in separate windows).
Added document outlines to the viewer.
Modified the text extraction (placement) algorithm.
Implemented the JBIG2 decoder.
Added a Latin2 language support package.
Added support for movie annotations.
Switched back to native LZW decompression code.
Text extraction from Type 3 fonts was (partly) broken.
The owner password checking code was missing a step in the case of
  128-bit encryption.
Added the 'printCommands' option to the xpdfrc file.
Added key binding for '?' to bring up the about/help dialog.
In TextOutputDev, ignore any text that's outside the page bounding
  box.
Text extraction throws away "tiny" characters after the first 20000
  per page, to avoid really slow runtimes with PDF files that use
  special fonts to do shading or cross-hatching; added the
  'textKeepTinyChars' option to disable this behavior.
Text extraction discards duplicated text (fake boldface, shadow
  effects).
Added ctrl-F as a key binding for find.
Added a "find next" function, bound to ctrl-G.
Added ctrl-P as a key binding for print.
Modified the DCT decoder to handle progressive and non-interleaved
  JPEG streams.
Added key bindings for ctrl-Home and ctrl-End.
Allow the initialZoom setting to be made in either the xpdfrc file or
  as an X resource.
Added a Hebrew language support package.  [Thanks to Roy Arav.]
The "make distclean" target now creates (empty) Makefile.dep files in
  the three subdirectories.
Initialize XRef::ownerPasswordOk.
Correctly handle stroking of Type 3 fonts in PSOutputDev.
Generate correct PostScript for fonts with "weird" character names
  (e.g., "(").
Generate correct PostScript for images using Indexed color spaces with
  DeviceN base color spaces.
Added lowercase Roman numerals to ISO-2022-CN.unicodeMap (simplified
  Chinese support package).
Tweak the image scaling code to better handle flipped (top-bottom
  and/or left-right) images.
Generate correct PostScript code for inline images and images in Type
  3 fonts which are too large for a single PS string.
Correctly handle indexed color spaces whose base color spaces have
  component ranges other than [0,1].
Optimized the DCT decoder.
Fixed mistakes in the list of key bindings in the about/help dialog.
Optimized the Flate decoder.
Add literal names for punctuation and digits to the Unicode name
  table.
Cygwin's popen wants mode "r", not "rb".
Fixed a bug in the Type 4 function parser (the "if" operator wasn't
  parsed correctly).
Fix a bug in PS output for TrueType fonts with no PDF encoding.
Make the bbox size in FTFont more liberal (to avoid problems with
  fonts that have incorrect bboxes).
Reverse the colors in PBM files generated by pdfimages, so the common
  case (an image mask filled with black) comes out correct.
Add fseeko/ftello support which is basically identical to
  fseek64/ftell64.  [Thanks to Nassib Nassar.]
Modified column assignment in text extractor to account for characters
  that convert to multiple characters in the output encoding.
Fix TrueType fonts which have an incorrect cmap table length.
Work around a pragma bug in the version of gcc that ships with MacOS X
  10.2.  [Thanks to Frank Siegert and Andrew Stone.]
Fix a problem that was causing an infinite loop when a damaged content
  stream contains an 'ID' command inside a dictionary.
Handle the case where systempapername() returns NULL (libpaper
  support).
Handle fonts which are defined directly in the font resource
  dictionary rather than as separate objects.
Track process colors in Level 1 separable PostScript.
Pdfinfo now checks the return value from mktime to avoid seg faults in
  flakey strftime implementations.
If duplex is not enabled in PostScript output, leave the duplex
  setting alone, allowing the spooler to insert its own setting.
Added three missing fclose calls.
Change the default encoding for TrueType fonts (used when the PDF file
  doesn't specify an encoding) from MacRomanEncoding to
  WinAnsiEncoding.
Move X_CFLAGS to the end of the list in CXXFLAGS (in Makefile.in) to
  avoid some of the FreeType2 include path problems.
Fixed an obscure bug in the LZW decoder.  [Thanks to Martin
  Schroeder.]
Fixed a bug in decryption when using the newer (PDF 1.4) algorithm
  with shorter-than-128-bit keys.
Minor optimization for image data streams: the ImageStream class can
  return an entire buffered line.

2.01 (2002-dec-05)
------------------
Redesigned the text extraction process:
  - process the text into "reading order"
  - added a "-layout" flag to pdftotext to switch back to the old
    style, where physical layout is maintained
  - use of the "-raw" flag is no longer recommended
Added the -reload option for xpdf (in remote mode).
Added support for external CID fonts; added the displayCIDFontT1 and
  displayNamedCIDFontT1 commands to the xpdfrc file.
Handle the case of moveto/newpath/clip, which defines an empty
  clipping region (just like moveto/closepath/clip).
Accept XYZ link destinations with missing array elements.
Fix some problems with state save/restore triggered by Type 3 fonts
  that reference other fonts.
Accept bogus font names based on "Symbol": Symbol,{Bold,Italic,
  BoldItalic}.
Fixed color and font resource names in the xpdf man page.
Was using delete instead of gfree in OutlineItem::~OutlineItem.
Set the busy cursor in the find dialog while searching.
Map variants of the copyright, trademark, and registered trademark
  symbols to the proper Unicode codes, not to Adobe's corporate use
  area codes.
Fixed a floating point exception bug in TextOutputDev (check for a
  too-small denominator).
Fixed a typo in TextOutputDev, in the code that generating blank lines
  to add vertical whitespace.
Config files whose last line didn't end with a LF (or CR+LF) weren't
  being handled correctly.
The code that handled CIDToGIDMaps in Type 2 CIDFonts was broken.
Check the per-glyph bounding box in Type 3 fonts, and don't try to
  cache glyphs with bogus bboxes.
Allow ToUnicode CMaps to use fewer than four hex digits in the Unicode
  char indexes.
Added multithreading protection to the GlobalParams class.
Fixed a bug in end-of-stream detection with the TIFF predictor.
Added some characters to MacRomanEncoding to match up with Apple's
  definition.

2.02 (2003-mar-24)
------------------
Rewrote the text extractor code that assembles words into lines to
  better handle vertically overlapping lines.
Add the "match" option for paper size (in PostScript output).
Added support for external 16-bit TrueType fonts; added the
  displayCIDFontTT and displayNamedCIDFontTT commands to the xpdfrc
  file.
Added an Arabic language support package.
Added the Windows-1255 encoding to the Hebrew language package.
A missing NULL check was causing a crash when closing the file in a
  single window (which clears out the window, but leaves it open).
Deal with TrueType fonts whose glyph data is out of order - this
  affected both FreeType rasterization and PostScript generation.
Munge font names in PSOutputDev to avoid names that are problematic
  for ghostscript because they start with an out-of-limits number
  (e.g., 1e999foo).
Modify the TrueType font encoding deciphering algorithm in yet another
  attempt to match up with Acrobat's behavior.
Bounds check the indexHigh value in indexed color spaces.
The text extractor no longer bothers trying to get an average
  character width for Type 3 fonts, since it generally doesn't work
  very well (because Type 3 metrics are unreliable).
Don't crash if the user hits ctrl-G ("find again") before doing a
  find.
Set the button pixmap foreground color correctly.
Handle text drawn backward on 180 degree rotated pages.
Added a magic call to XtUngrabButton after calling XmCreatePopupMenu
  which appears to prevent some very odd problems (idea taken from the
  DDD source code).
Fix the MacOS X fix (needed to include <AvailabilityMacros.h>).
Fixed a bunch of Motif 1.x / X11R5 incompatibilities.  [Thanks to
  William Bader and Albert Chin-A-Young.]
Fixed various bugs in previously untested code in the JBIG2 decoder.
Modify the XPDFCore destructor to avoid a bogus warning message from
  OpenMotif 2.2.
Modified the Type 1C font parser to do proper bounds checking.
Fixed the bounds checking in the TrueType font parser.
Text extractor shouldn't do block merging in physical layout mode.
Fixed a problem in PSOutputDev in level2sep mode with images in a
  Separation color space and with a non-default Decode array.
Text extraction with "-raw" was concatenating lines from the bottom of
  one column and the top of the next.
Handle Type 1C subroutines in the font converters.
Correctly handle progressive JPEG images whose scans are slightly
  different sizes (e.g., the Y scan rounds up to a multiple of 8
  pixels and the Cb/Cr scans round up to 16 pixels).
Avoid a potential divide-by-zero problem in TextOutputDev.
Modified the T1Font and FTFont modules to correctly handle glyphs that
  are larger than the font's claimed bounding box.
Tweak dupMaxDeltaX parameter in TextOutputDev to avoid triggering on
  double characters.
Improved detection in pdfinfo for ISO paper sizes.  [Thanks to Hartmut
  Henkel.]
Xpdf wasn't responding to the TARGETS atom, which prevented pasting
  the selection into various applications.  [Thanks to Phillip Ezolt.]
Handle XObjects with recursive references in their Resources
  dictionaries (in PSOutputDev).
Change PSOutputDev to deal with invalid PDF files that use
  non-embedded TrueType fonts with no encoding.
Check for undersized Widths arrays in fonts.
Add bounds checking code to Array class.
Updated VMS build scripts.  [Thanks to Martin Zinser.]
Tweak the TrueType font handling code (again):
  - char codes in symbolic fonts may or may not be offset by 0xf000
  - discard empty tables because they sometimes confuse FreeType
Fixed bounds checking in the Flate decoder.
Removed a bogus error message for exponential functions without
  explicit C0/C1 values.  [Thanks to Hartmut Henkel.]
Handle the other Unicode cmap type (platform=0) in TrueType fonts.
Added support for the SGI Motif horizontal paned window widget.
  [Thanks to Felix Ritter.]
Ignore extra elements in link destination arrays.
Accept external Type 1 font files with a suffix of ".ps" or no suffix
  at all.
Add a bounds check in the DCT decoder.
Added instructions for building xpdf.exe under cygwin/XFree86.
Tweaked the word separation parameter for raw-mode text extraction.

2.03 (2003-oct-10)
------------------
Rewrote the text extractor to:
  - do a better job with rotated text;
  - handle right-to-left scripts;
  - be faster.
Changed the zoom setting to use a percentage (relative to 72 dpi)
  instead of a zoom "factor".
If the PDF file has an outline, open the outline pane initially.
Added -f and -l options to pdfinfo; print multiple page sizes.
The HAVE_XTAPPSETEXITFLAG test in XPDFApp.cc was backwards.
The BitsPerComponent entry is optional in image mask objects.
Render any annotation with an appearance stream, instead of just
  Widget and Stamp annotations.
Fix a bug in the TrueType font checker: the test for an unsorted
  'loca' table was wrong.
Modify the TrueType cmap selection algorithm yet again to try to match
  Adobe's behavior.
Changed sqrt(2) to sqrt(2.0) in pdfinfo.cc to make various compilers
  happy.
Fixed a deadlock problem (when MULTITHREADING is set); cleaned up some
  other problems with the locking code.
Fixed a bug in the interpolation code for type 0 (sampled) functions.
Implemented type 1 (function-based) shaded fills.
Fixed some stupid bugs in the JBIG2 decoder (introduced with the
  previous optimization work).
Fixed a typo in the code that parses vertical font metrics for CID
  fonts that was causing a seg fault.
Fixed a couple of bugs that were causing seg faults with badly damaged
  PDF files.
Limit the number of nested Forms to avoid infinite recursion (in buggy
  PDF files).
Add a special case for rectangular clip regions - make sure these
  don't drop pixels on the right and bottom edges.
Tell FreeType not to use glyph bitmaps when in anti-aliased mode.
Read all of the border style info for links.
All of the shaded fill types now do at least one bisection to avoid
  problems when the colors at the endpoints of the domain are the
  same.
If the Length2 parameter for an embedded Type 1 font was incorrect
  (too small), pdftops was losing font data.
Deal with (broken) DCT streams that use the same component ID number
  for different components.
The MediaBox page attribute was not being inherited correctly.
Fixed a bug in the Type 1C font converter related to local
  subroutines.
The Type 1C -> Type 1 font converter was allocating the font dictionary
  one slot too small.
Added a missing private dictionary entry to Type 1 fonts generated by
  the Type 1C converter.  [Thanks to Michael Shell.]
Fixed bugs in the tiling pattern fill code.
Try the TrueType 0xf000 char code offset hack for the MacRoman
  encoding too (in addition to MS Symbol).
Update the font metrics info for the Base 14 fonts to include the Euro
  character.
SECURITY HOLE: Escape various characters in URLs before running a web
  browser (or movie viewer).  [Fixed in 2.02p11]
SECURITY HOLE: In the dialog used to verify "launch" links, provide a
  scrolling view if the command to be run is excessively long.  [Fixed
  in 2.02p11]
Added an option to disable insertion of page breaks (form feed
  characters) in extracted text (pdftotext -nopgbrk; xpdfrc
  "textPageBreaks" option).
Check for 8-bit fonts that specify an out-of-range FirstChar or
  LastChar.
Correctly handle an obsolete Type 2 charstring op (in the Type
  1C-to-Type 1 font converter).  [Thanks to Helge Blischke.]
Use the font encoding info to fill in holes in the ToUnicode map.
Added character names for Bulgarian (in the Cyrillic support pacakage)
  and Greek.
Handle clipping to text in xpdf and pdftops.
Fix color space detection in DCT decoder.  [Thanks to Dwight Kelly.]
Added the "unicodeToUnicode" xpdfrc option, intended (initially) for
  Arabic support.
Handle the case in PSOutputDev where two font objects refer to the
  same embedded TrueType font, but with different encodings.  [Thanks
  to Frank Siegert.]
Kill any pre-existing path before drawing a form (or annotation).
Save state before rendering page content; restore state afterward.
Fix Stream::reset/close to work correctly with encoder streams; fix
  PSOutputDev to use Stream::close consistently.
Fix a seg fault when hitting the 'back' button after closing a file.
GfxState::getStrokeGray was returning the fill gray value (this only
  affected Level 1 PS output).
Change PSOutputDev to reuse dictionaries in Level 1 mode (since Level
  1 PS interpreters don't do garbage collection).  [Thanks to Frank
  Siegert.]
PSOutputDev was generating incorrect translations for landscape-mode
  pages.
Implemented shading pattern color spaces.
PSOutputDev wasn't correctly handling Type 3 fonts which used image
  resources (as opposed to inline images).  [Thanks to Frank Siegert.]
The fix from 1.00 which clipped out-of-bounds points was a bit too
  aggressive.
Do proper Floyd-Steinberg dithering in XOutputDev.
Don't automatically check for a null owner password (to match Adobe's
  behavior).
Allow the FlateDecode filter in Level 3 PostScript output.
Fixed small bugs in the Type 1C -> Type 1 converter and Type 1C ->
  Type 0 converter.  [Thanks to Tom Kacvinsky.]
Work around another weird Motif problem with the right button menu
  (which was sometimes causing the menu to not be displayed).
Make the code that handles fonts defined directly in the resource dict
  more robust.
Add a brief description of the outline pane to the xpdf man page.
Ignore extra operands to content stream operators.
Fixed a bug in the CCITTFax decoder.
Allow the Count entry in a Pages dictionary to be a real number
  (because some PDF generators actually do this).
Shading pattern fills weren't being clipped correctly.
Incorrect shallow copies in GfxRadialShading and StitchingFunction.
The StitchingFunction destructor wasn't checking for funcs being
  NULL.
Change the TrueType code-to-GID mapping code so it looks at the
  TrueType 'post' table.
Set the print command in the print dialog once at startup, don't
  change it each time a file is (re)loaded.
Generate the %%BoundingBox comment in regular PostScript files (not
  just EPS files).
Fixed a bug in the Unicode CMap parser.

3.00 (2004-jan-22)
------------------
New PDF rasterizer ("Splash").
Added support for PDF 1.5:
  - JPX (JPEG 2000) decoder
  - XRef streams
  - object streams
  - DeviceN color spaces with up to 32 components
  - Added new CMaps to the CJK language support packages
Replaced pdftopbm with pdftoppm (which can generate PBM, PGM, and PPM
  files).
Reorganized the font file parser code into a new library ("Fofi").
Removed support for FreeType 1.x.
Removed support for X server fonts - Xpdf (and pdftoppm) will now
  search for the URW fonts (from ghostscript).
Changed the "-t1lib" and "-freetype" switches; replaced the
  "t1libControl" and "freetypeControl" config file options with
  "enableT1lib", "enableFreeType", and "antialias".
Added the "-box" option to pdfinfo.
Added imageable area support to PSOutputDev (for CUPS); added the
  "psImageableArea" config file option.
Added the "-nocrop", "-expand", "-noshrink", and "-nocenter" switches
  to pdftops; added the "psCrop", "psExpandSmaller", "psShrinkLarger",
  and "psCenter" config file options.
Dictionary size was in PostScript code generated for Type 3 fonts.
The PS code generated for images in Type 3 characters was broken.
Tweaked the text extractor.
Accept xref entries that are one byte too short (matching Adobe's
  behavior).
Change things so "xpdf -h" and "xpdf -v" work if DISPLAY isn't set.
Fix a problem in the damaged file repair code that handles the trailer
  dictionary.
Use the "Last" entries in "Outlines" objects - this avoids a problem
  with PDF files generated by buggy software that, e.g., sets the last
  item's Next pointer to point to itself.
PSOutputDev was not handling DeviceN color spaces correctly in Level 2
  images.
Fixed a stupid little bug that broke PS output for JBIG2 images.
Work around a Lesstif bug: set up an extra callback so hitting <Enter>
  in the find dialog performs a search.  [Thanks to Elliott Hughes.]
Pdftops was crashing on zero page PDF files.
Add an AC_PREREQ call to configure.in.
Change the 'find' dialog so the text entry box resizes with the
  dialog.
Skip extraneous zero bits at the start of a CCITTFax stream.
The PostScript text clipping operator was missing a 'newpath'.
  [Thanks to Frank Siegert.]
Fix a bug in tiling patterns with bboxes that don't start at (0,0).
Fix a bug in Type 3 font handling with rotated text.
The tiled pattern fill code was destroying the current path, which
  broke the fill+stroke operators when the fill color space was a
  tiled pattern.
ICCBased color spaces don't always set their Ranges values correctly,
  so just use the values from the alternate color space.
Modified GHash to accept int or void* - this avoids some conversion
  warnings.
Check for missing Type 3 CharProcs - avoid a segfault.
Pdffonts now marks all Type 3 fonts as embedded.
Outline entries with no Title string weren't being handled correctly,
  resulting in segfaults.
PSOutputDev now forces the text horizontal scale factor to be non-zero
  to avoid singular font matrices in the PS code.
Tweaked the error recovery in the CCITTFax decoder.
The LZW/Flate predictor should treat any Predictor value (in the
  stream dictionary) >= 10 identically.
PSOutputDev and pdffonts check for NULL font objects (which can
  happen, e.g., because of missing CMap files).
Swap the left and right mouse wheel button numbers.
EPS output ("pdftops -eps") now uses the CropBox instead of the
  MediaBox as the EPS bounding box.

3.01 (2005-aug-17)
------------------
Added the continuous view mode, including the '-cont' switch and the
  'continuousView' config file option.
At high zoom levels, don't rasterize the entire page - this avoids
  problems running out of memory.
Added "search backward" and "match case" options to the find dialog.
Support explicitly masked images and soft masked images.
Add support to DCTStream for 16-bit quant tables.
Don't segfault if the user clicks on an outline entry with a broken
  destination.
Changed the makefiles and configure script to skip building pdftoppm
  (in addition to xpdf) if X, Motif, or FreeType is not found; changed
  the error message in the configure script to match.
Move an inline function in JArithmeticDecoder.cc to avoid compiler
  errors.
Fixed a bug in the rasterizer that was sometimes causing infinite
  loops with round line caps on vertical lines.
Various rasterizer optimizations.
Look for intermediate resize events - try to avoid lagging when the
  user is doing an opaque resize.
The FormType key in Form XObjects is optional.
Handle external 16-bit TrueType fonts correctly, using the Unicode
  cmap.
Add class declarations to TextOutputDev.h to work with stricter C++
  compilers.
Support FreeType's weird include file stuff (ft2build.h, etc.).
Fixed a bug handling empty paths.
Fixed a text positioning problem in PostScript output.
Handle TrueType collections in FoFiTrueType.cc.
FoFiTrueType constructor was reporting a failure if the post table was
  bad - this should be non-fatal.
Type 1 font parser was missing a NULL test.
Mask chars passed to isdigit in goo/parseargs.c to avoid problems with
  signed chars.
Added more error checking to the CCITTFax decoder.
Fixed a bug (computing the MCU size) in the DCT decoder.
Change a test in the Splash stroke code to avoid x86 floating point
  weirdness.
Reorganized the decryption code to allow security handler plugins;
  removed the NO_DECRYPTION #ifdefs.
Added a plugin interface, initially just for security handlers.
Support color key masked images and explicitly masked images in PS
  output (Level 2 only).
When checking for aliases of the Base 14 fonts, ignore spaces in the
  specified font name.
Handle encrypted PDF files that are missing the file ID string.
Handle tiling patterns more efficiently in the PostScript output.
Rewrote the code that handles color spaces in PostScript output.
Fixed a bug in the Type 1C font parser - zero-length indexes (and
  zero-length names) weren't handled correctly.
Handle shaded fills more efficiently in the PostScript output.
Implement the remaining shading types (4-7).
Rearranged the Splash color modes.
Add the EarlyChange parameter to LZWStream when generating PostScript.
Check for zero values in line dash arrays in PSOutputDev.
Fixed an uninitialized variable in JArithmeticDecoder which was
  causing crashes.
Treat unknown CMap names as identity mappings (to match Adobe's
  behavior).
Fixed bugs in the XRef parser related to XRef streams in updated
  files.
Added a missing call to FT_Done_Glyph which was causing a memory leak.
  [Thanks to Dave Formanek.]
Fixed a bug in text copying that was causing the last word to be
  dropped on some pages.
Tweaked the image width/height computation in Splash::drawImage and
  Splash::fillImageMask to make striped images work better.
Ignore minus signs in the middle of numbers (to match Adobe's
  behavior).
Missing '%s' in format strings for dates in pdftotext '-htmlmeta'
  mode.
Change the TrueType code-to-GID mapping code so it looks at the
  standard name-to-Unicode mapping before the ToUnicode mapping
  defined in the font object.
Added a matteColor setting (command line option and X resource).
Tweaked the CMYK->RGB transform.
Fix some problems in tracking the character position (to match up with
  Adobe's highlight file format).
Handle moveto/closepath/stroke correctly.
Check for singular text matrices and font size of zero in PSOutputDev.
Clip PS output to the size of the page (avoiding any gibberish that
  lies outside the MediaBox, in the case where the MediaBox is smaller
  than the paper).
If the line dash element in an annotation's Border array is of an
  invalid type (i.e., not an array), don't draw the link at all (this
  matches Adobe's behavior).
Don't remap small caps and oldstyle glyphs in the name-to-Unicode
  table - it messes up TrueType font encodings.
Pdftoppm wasn't setting the paper color correctly in mono and gray
  modes (this only showed up on big-endian machines).
Missing NULL check was causing crashes when attempting to read non-PDF
  files that happened to contain the string '%PDF'.
Fixed a problem in the text extractor that was breaking up words.
Handle vertical text (CJK fonts) in PS output with TrueType fonts that
  are missing the vertical metrics tables.
Handle the case where a font object and the corresponding embedded
  font are different types.
Handle basic crypt filter functionality.
Added more value checking in the XRef parser, to avoid potential
  security problems.
Updated the CJK language support packages: replaced the
  displayCIDFontX references with displayCIDFontTT; added pointers to
  free TrueType fonts.
Added a missing error message when SplashOutputDev can't parse an
  embedded TrueType font file.
PDFCore and TextOutputDev now correctly handle searching for Unicode
  strings, including real Unicode case-folding.
Throw away tiling pattern fills that are completely outside the clip
  region.
The JPEG 2000 inverse reversible multiple component transform code was
  wrong.
Fixed some bugs in shading pattern fills: clipping was wrong, and
  background color was not implemented.
Added tool tips for the toolbar buttons.
Decrease the max depth of recursive patch mesh filling if the pattern
  has a large number of patches.
Highlight the find text whenever the find dialog is mapped.
Handle page boundary boxes with reversed coordinates.
Fixed a bug in the text extractor code that handles duplicated text.
Optimization work on SampledFunction::transform().
Use the CropBox instead of the MediaBox as the display region.
Dither for PseudoColor (8-bit) displays.
Fix a bug in DCTStream that was causing an infinite loop with
  corrupted DCT image data.
Fix a bug in the ToUnicode CMap parser.
Fix a bug in the text extractor - negative font sizes weren't being
  handled correctly.
Fix a bug in the text extractor - in certain cases, out-of-bounds text
  could cause crashes (generally only in damaged PDF files).
Fix a read-past-end-of-array bug in the JBIG2 decoder.
Fix a case where pdftops was generating lines longer than 255 chars.
Optimize redraws - don't regenerate the XImage every time redrawRect
  is called.
The ASCII85 decoder wasn't skipping whitespace properly.
Optimize text extraction: skip (non-inline) image setup entirely.
Added initial transparency support (stroke/fill alpha and blend mode).
Added support for the overprint setting in PostScript output.
Fixed various buffer overflow bugs.
Handle negative font sizes and horizontal scaling correctly - this
  affected PSOutputDev for all text operators, as well as the TJ
  operator for all OutputDevs.
Fixed a buffer overflow in the CCITTFax decoder.
Fixed an out-of-order entry in the list of font name aliases.
Fixed a backward loop in the PostScriptFunction code.
Treat a zero-length base URI the same way as a nonexistent base URI.
Add a divide-by-zero check in TextOutputDev (the problem was happening
  in cases of mixed horizontal and vertical text).
PSOutputDev wasn't rounding the page bounding box coordinates
  correctly.
Support the SOF1 marker in DCT (JPEG) image streams.
Minor changes to GlobalParams.h and JPXStream.h because some compilers
  don't like anonymous structs inside anonymous unions.
Xpdf now complains about a negative page number.
Changed GString::cmp and GString::cmpN to correctly handle '\0' chars
  in the middle of strings.
Fixed the radial shading code; corrected the handling of the 'extend'
  parameters.
Added the gmallocn and greallocn functions.
Fixed a bug in the TIFF image component predictor which shows up with
  components that are not 1 or 8 bits wide.
Optimized FlateStream::loadFixedCodes().
For non-embedded Base-14 fonts, don't use the ascent/descent/bbox
  values from the FontDescriptor - various PDF generators get them
  wrong.
Fixed a bug in the text extractor - words on the same line (especially
  in tables) were being split vertically onto multiple lines.
Automatically select the correct radio button ("print with command"
  vs. "print to file") in the print dialog.
Don't create the "open" and "save as" dialogs until needed - this
  avoids stat-ing every file in the directory at startup.
Changed the Big5 and Big5ascii encodings (in the traditional Chinese
  language support package) to include characters from the Unicode
  database (which aren't mentioned in the Adobe character collection
  documentation).
Added the '-pagecrop' switch to pdftops.
Tweaked the RGB->gray and CMYK->gray conversion functions to match the
  PDF spec.
The JPEG 2000 decoder wasn't correctly handling codeblocks split
  across multiple packets/layers.
Fixed a typecast that caused compile errors on 64-bit systems.
The CMap parser wasn't handling the 'cidchar' construct.
Handle the case in PSOutputDev where two font objects refer to the
  same embedded 16-bit TrueType font, but with different CIDToGIDMaps.
Changed the configure script to report more accurate warnings when
  it can't find X / Motif / FreeType.
Encryption with revision=2 always uses a 40-bit key, regardless of the
  specified Length value.
Yet another minor change to the TrueType font encoding deciphering
  algorithm.
Don't completely invalidate the Catalog if one (or more) of the page
  objects are bogus -- just skip over those pages.
Removed the workaround in pdftops for too-small Length2 values in Type
  1 fonts -- it was causing problems on various PostScript printers.
Started adding error checking to the JBIG2 decoder (this is nowhere
  near complete yet).
Extended the "unicodeToUnicode" config option to also apply to CID
  fonts.
Added the narrow Latin characters to the Adobe-Korea1.cidToUnicode
  file in the Korean language support package.
Fixed the code that handles page rotation in PSOutputDev.
When converting a Type 1C glyph to a Type 1 glyph, insert closepath
  operators as appropriate.
Check for a sane 'loca' table in TrueType fonts (FoFiTrueType::parse).
Fix PSOutputDev to correctly handle the case of an empty name in a
  font encoding.

3.02 (2007-feb-27)
------------------
Added anti-aliasing for vector graphics; added the vectorAntialias
  xpdfrc option; added the "-aaVector" switch to xpdf and pdftoppm.
Implemented stroke adjustment (always enabled by default, ignoring the
  SA parameter, to match Adobe's behavior), and added the strokeAdjust
  xpdfrc command.
Support PDF 1.6 and PDF 1.7.
Added support for AES decryption.
Added support for OpenType fonts (only tested with 8-bit CFF data so
  far).
Added user-configurable key/mouse bindings - the bind/unbind xpdfrc
  commands.
Cleaned up the full-screen mode code and added the ability to toggle
  it on the fly (the default key binding is alt-f).
Pdfimages with the -j option now writes JPEG files for 1-component
  (grayscale) DCT images, in addition to 3-component (RGB) images.
Fixed bugs in handling sampled (type 0) functions with 32-bit
  samples.
Fixed some things to support DeviceN color spaces with up to 32
  colorants.
Pdftops now constructs the %%Creator and %%Title DSC comments from the
  relevant information in the PDF Info dictionary.
Tweak the TrueType font encoding deciphering algorithm.
Added the "mapUnkownCharNames" xpdfrc option.
Fix a bug (that only showed up with certain window managers) in the
  intermediate resize event optimization.  [Thanks to Michael Rogers.]
Check for a broken/missing embedded font (this was causing xpdf to
  crash).
Added support for transfer functions in PostScript output.
Be a bit more tolerant of Link destinations that contain null values
  for positioning parameters.
Use ordered dot dithering instead of clustered dot dithering at
  resolutions below 300 dpi (for monochrome output).
Fixed security holes (bounds checking issues) in several places.
Don't bother creating a SplashFont (allocating memory) for fonts that
  are only used for hidden text - this avoids problems with fonts of
  unreasonably large sizes.
Clipping in TextOutputDev was off for characters on the left edge of
  the page.
The scn and SCN operators weren't correctly handling colors with more
  than four components.
FoFiType1::writeEncoded wasn't always correctly finding the end of the
  encoding.
Use the ColorTransform parameter in the DCTDecode stream dictionary.
Type 3 fonts are allowed to have a bbox of [0 0 0 0], which means
  "unspecified" -- don't issue error messages in that case.
Perform the transform (to device space) in Splash instead of in
  SplashOutputDev -- this is needed to correctly handle round joins
  and caps on stroked paths.
PSOutputDev now rasterizes any pages that use transparency.
Limit the crop, bleed, trim, and art boxes to the edges of the media
  box (per the PDF spec).
Change GString to increase the allocation increment by powers of two.
Handle whitespace in hex strings in CMap files/streams.
Use strings instead of names for separation colorant names in
  PSOutputDev.
For explicitly masked images where the mask is higher resolution than
  the image, use the soft mask code.
Avoid problems with very large x-steps in the PostScript output for
  tiling pattern fills.
Avoid a divide-by-zero in stitching functions which have a subfunction
  with empty bounds.
Honor the "Hidden", "NoView", and "Print" flags on annotations.
Rewrote the pixel rendering code in Splash to use a single set of
  pixel pipeline functions.
Added support for transparency groups and soft masks.
Fixed the transparency blend functions to match the addendum published
  by Adobe.
Changed Splash/SplashBitmap to store alpha in a separate plane.
Setting the color space now selects the correct default color for that
  color space.
Remove the mutex lock from GlobalParams::getErrQuiet() to avoid a
  deadlock when parseCIDToUnicode() or parseUnicodeToUnicode() calls
  it from inside a locked section.
Added error checking (on the argument count) in the sc/SC/scn/SCN
  operators.
Skip over notdef glyphs in TrueType fonts (which sometimes get drawn
  as little boxes), to match Adobe's behavior.
Painting operations in a Separation color space with the "None"
  colorant or a DeviceN color space with all colorants set to "None"
  never mark the page.
Fixed an obscure bug in the JPX decoder - it wasn't reading the extra
  stuffing byte in the case where the last byte of a packet header was
  0xff.
Change the TrueType font parser (FoFiTrueType) to change the glyph
  count rather than report an error if the 'loca' table is too small.
Fixed a couple of bugs in the JBIG2 decoder.
Added stochastic clustered dot dithering.
Added the screenType, screenSize, screenDotRadius, screenGamma,
  screenBlackThreshold, and screenWhiteThreshold xpdfrc settings.
PSOutputDev now correctly handles invalid Type 3 charprocs which don't
  start with a d0 or d1 operator
FreeType 2.2.x support - get rid of the FT_INTERNAL_OBJECTS_H include,
  and add some 'const' declarations.
Handle PDFDocEncoding in Info dictionary strings.
Tweak the xref repair code - ignore whitespace at the start of lines
  when looking for objects.
Added the "-exec" switch to xpdf.
Removed the xpdf.viKeys X resource.
Changed the color key / explicit masked image code in PSOutputDev to
  generate better PS code, including a Level 3 option.
Tweaked the DEBUG_MEM code for performance.
Move the JBIG2 global stream reading code into reset() instead of the
  constructor - this way, pdftotext doesn't end up reading the global
  stream.
Added the "-preload" option to pdftops and the psPreload xpdfrc
  command.
Added the "zoom to selection" command (on the popup menu).
Fix a bug (in xpdf/pdftoppm/pdftops) with tiling patterns whose bbox
  size is different from their xStep/yStep.
Implemented stroke with pattern color spaces.
Following a link to a page whose CropBox was different from the
  MediaBox was resulting in an incorrect scroll position.
Parse truncated date strings from the Info dictionary correctly.
Change FoFiType1 to handle Type 1 fonts with two /Encoding keys.
Extend the PSOutputDev shaded fill code to handle DeviceCMYK shaded
  fills in level2sep and level3sep modes.
Detect infinite loops in the Page tree.
Optimized the ASCII85Encoder code.
Tweaked the text extractor to do a better job of lining up rows of
  text.
Leave images compressed (or re-compress them with RLE) in PostScript
  output when setting up images for forms and Type 3 fonts (or with
  -preload).
Extend FoFiType1 to handle Type 1 fonts with octal character codes in
  their encodings.
Use a custom string formatter to avoid problems with locale-based decimal
  formatting (commas instead of periods) in PS output.
Allow comments in PostScript-type functions.
Change the TrueType font parser (FoFiTrueType) to delete glyf table
  entries that are too short.

3.03 (2011-aug-15)
------------------
Added the "fixed pitch" text extraction mode.
Modified "pdftops -paper match" to handle PDF files with
  different-sized pages, i.e., it will now select the matching paper
  size on a page-by-page basis.
Add ability for pdftoppm to write to stdout.
Added the pdfdetach tool.
Implemented 256-bit AES decryption.
Commented out the t1lib section in the configure script -- t1lib has
  some potential security holes, and hasn't been updated in years.
Redesigned the font configuration xpdfrc commands: removed the
  displayFontT1, displayFontTT, displayNamedCIDFontT1,
  displayCIDFontT1, displayNamedCIDFontTT, displayCIDFontTT, psFont,
  psNamedFont16, and psFont16 commands; added the fontFile,
  fontFileCC, psResidentFont, psResidentFont16, and psResidentFontCC
  commands.
Switched from GPLv2 to dual v2/v3 licensing.
Performance: cache tiling patterns.
Implemented text fills with pattern color spaces.
Rewrote the image and image mask rendering code to be more accurate
  and faster.
Fixed a bug in PDFCore that could sometimes cause crashes at high zoom
  levels.
Implemented embedded CMap streams.
Added the 'setSelection' command.
Added the 'rotateCCW' and 'rotateCW' commands.
Added the 'psFontPassthrough' xpdfrc command.
Added the 'launchCommand' xpdfrc command.
Implemented alpha-type soft masks.
Added "Form: AcroForm|XFA|none" to pdfinfo output.
Added support for image masks filled with pattern color spaces.
Text search wasn't finding all occurrences of a string on rotated pages
  (i.e., pages where the primary rotation, as displayed, was not
  horizontal).
The text extractor now uses "ActualText" spans if they are present.
Modified PSOutputDev so it always check for transparency; if Splash is
  not available, it now prints a warning.
Handle the blending color space for soft masks.
Added the disableFreeTypeHinting xpdfrc option.
Added the psAlwaysRasterize xpdfrc option.
Added support for transfer functions in the rasterizer.
Optimized the JPEG 2000 decoder to use less memory.
Do fill adjustment (similar to stroke adjustment) on simple
  rectangular fills.
Added the antialiasPrinting xpdfrc setting.
Added '%i', '%j', and '%k' (mouse pointer page and position) to the
  available options for the 'run' command.
Links with the underlined border style were being drawn with the lines
  over, instead of under, the text.
Add #include <aconf.h> to XPDFTree.cc (to avoid problems with certain
  compilers).
Change XRef::fetch() to avoid infinite loops caused by odd damage to
  the xref table (e.g., where a stream object's "Length" value is an
  indirect reference that points to another stream object).
Minor fix in GString.cc to deal with an error in newer C++ compilers
  (pow() can take int or double args).
Handle embedded fonts which are declared with the wrong font type,
  including 8-bit fonts declared as CID fonts and vice versa; this
  was causing various problems, including crashes and invalid
  PostScript output.
In text extractor, don't drop horizontally overlapping words onto a
  separate line.
The numbers in the operand to the TJ operator should be multiplied by
  the current horizontal scaling parameter.
Fixed a bug in the Type 1C-to-Type 1 font converter -- need to escape
  strings in the font dictionary.
The zero-font-size check in PSOutputDev.cc was broken.
Fixes for the form field appearance regeneration code: handle Unicode
  strings (by downconverting to Latin1); check for "True" in addition
  to "Yes" as a button value.
Modify XPDFTree to limit the widget height to 32767 pixels -- this
  avoids crashes with very large outlines.
Modify FoFiType1 to handle PFB headers in Type 1 font files.
Allow image mask decode arrays to be [1.0 0.0] in addition to [1 0].
Tweak the form field appearance regeneration code.
PSOutputDev now sets up resources for DR dictionaries in forms (in
  case the form field appearances are regenerated).
For TrueType fonts which are marked symbolic, the cmaps should be
  ignored.
Change the handling of numeric characters in Unicode text output --
  they are now treated as left-to-right, which isn't strictly correct,
  but does result in correct visual formatting.
Modify FoFiTrueType to handle bogus loca table entries where the
  offset is past the end of the glyf table.
Fixed shading pattern fills to do clipping and background fills
  correctly.
Change the code that reads the page tree to be more flexible with
  regard to improperly constructed trees.
Changed the PostScript header comment from "Produced by xpdf/pdftops
  x.yy" to "XpdfVersion: x.yy" to make it (mostly) DSC-compliant.
Fixed PSOutputDev to handle page rotation correctly where the PDF page
  is rotated 90 or 270 degrees and the page width (before rotation) is
  greater than its height (and vice versa for 0 or 180 degrees).
Unbalanced save/restores inside form XObjects (which can be happen in
  damaged or incorrectly constructed PDF files) could cause crashes.
The CCITTFax decoder could go into an infinite loop on certain types
  of corrupt input.
Added the "drawAnnotations" xpdfrc command.
Added the "psUncompressPreloadedImages" xpdfrc command.
Escape newlines and other non-printable characters in the custom color
  DSC comments in PostScript output.
Added the tilingPatternFill and *ShadedFill functions to
  PreScanOutputDev to speed it up.
Too many elements in an image's Decode array should not be a fatal
  error.
Fixed a buffer overflow security hole in StreamPredictor.
Empty pages (zero-length content streams and null contents) were
  causing crashes in continuous view mode.
Handle line dash arrays that start with a zero element correctly.
PreScanOutputDev was not correctly detecting all transparency - in
  some places, it was looking only at the blending mode, and not at
  the opacity setting.
Force halftone screen size to be a power of 2.  This allows optimizing
  the halftoning code.
Fixed a bug in the JBIG2 MMR decoder (and also in the CCITTFax
  decoder) that was causing array references with negative indexes.
Fixed a bug in the transparency code that was causing memory overruns.
Fixed a 64-bit bug in the ASCII85 encoder.
The focusToPageNum was crashing in full-screen mode - it should simply
  do nothing.
Added '%p' (current page number) to the available options for the 'run'
  command.
Tweak the behavior with PDF files that have pages of different widths
  in continuous mode: scroll horizontally to avoid blank space on the
  left side (when changing pages via entering a page number or
  clicking on a link).
A closepath followed by a lineto should create a new subpath for the
  lineto.
Fixed a buffer overflow in the CCITTFax decoder.
Adobe Acrobat appears to ignore the flatness setting when rasterizing
  curves, so Xpdf now does the same.  (Oddly, Acrobat passes the
  flatness setting through to PostScript output, which ends up making
  the PS file look different from the PDF file - so Xpdf continues to
  pass flatness through to PS files, too.)
Pdfimages now ignores tiling pattern fills (for performance reasons).
Fixed a bug in PDFCore that could sometimes cause crashes at high zoom
  levels.
Use std::sort (with functors) in place of qsort (if available) - this
  can be significantly faster.
Hitting "close" while Xpdf is in full-screen mode (with only one file
  open) was crashing.
Tweak the TrueType font encoding deciphering algorithm.
Rewrote the CCITTFax decoder inner loop - this fixes a security hole.
Fixed two security holes (missing bounds checks) in the DCT decoder.
Do the correct zooming for "Fit" and "FitR" destinations.
Implement the rotation value in the form field appearance regeneration
  code.
When PSOutputDev rasterizes a page (because it contains transparency),
  the image is broken into stripes if it is above a size threshold.
Don't clip the other page boxes to the MediaBox at the intermediate
  (Pages) nodes; only do it at the leaf (Page) nodes - the other boxes
  can be specified before the MediaBox is specified.
Split several special cases off from Splash::pipeRun, for performance.
Add a sanity check for excessively large font sizes (which caused
  problems because Xpdf tried to allocate memory for a font cache).
Fixed a bug in the GfxCIDFont constructor involving reading the
  vertical metrics.
Rewrote the code that handles annotation transforms - it was not
  handling non-rectangular transforms correctly.
Tweak the Type 3 bbox code to allow some slack on the left/bottom
  edges, as well as the top/right edges.
Fixed a bug that was causing problems rendering Type 3 fonts to 1-bit
  monochrome output.
Handle the case where AES padding is invalid.
Changed XRef::getNumObjects to return the number of used entries,
  instead of the same value as returned by XRef::getSize().
Ignore bogus entries in the TrueType table directory instead of
  immediately giving up on the font.
Fixed a bug in the radial shading code that could cause divide-by-zero
  errors.
Tweaked the TrueType font fixup code to deal with an extra zero entry
  at the end of the loca table.
Increased font cache sizes to improve performance.
Tweaked the TrueType notdef kludge to skip the notdef glyph only if it
  was caused by a character for which a Unicode/MacRoman mapping could
  not be found.
Added another font size sanity check, this time for Type 3 glyphs.
Added initial support for optional content (layers) - no GUI yet.
For CID fonts that specify the 'Adobe-Identity' or 'Adobe-UCS'
  collection, use an identity mapping for char code-to-Unicode
  conversion.
Updated the error function to take a category argument, and to use
  GString::format instead of printf; added an error callback.
The PDF spec claims that names are limited to 127 chars, but Distiller
  8 will produce longer names, and Acrobat 8 will accept longer names
  -- Xpdf will now handle them, too.
Change the Catalog code so it doesn't load the entire page tree at
  startup (this only helps the command line tools - the viewer scans
  all of the pages at startup).
Clip opacity values to the range [0,1].
Handle glyph names of the form 'unixxxx' (similar to Ann, Axx, etc.).
Resolution of rasterized pages in PostScript output was not being
  computed correctly (resulting in overly large images).
Extend the mapUnknownCharNames config command to cover CID fonts.
Zero-length segments in the middle of stroked paths were not being
  handled correctly -- they should be completely ignored, except for
  the special case of a zero-length path with round line caps.
Various optimizations to the Splash rasterizer.
Allow "Identity" and "Default" as the transfer function in soft masks.
Tweaked the ToUnicode CMap parser to allow <00xx> char codes for 8-bit
  fonts.
TextPage::clear() was not clearing the lists of underlines and links.
Changed the CCITTFax decoder to correctly handle the interaction
  between the EndOfLine and EncodedByteAlign parameters.
Fixed a bug where xpdf wouldn't go to a destination specified on the
  command line, if continuous mode was enabled
  (xpdf -cont file.pdf +foo).
Fixed a bug in the FreeType interface code which was causing incorrect
  positioning/sizing of characters.
Tweaked the FreeType interface code - use 'light' hinting with Type 1
  fonts (because it generally looks better).
Tweak the Windows font searching code to handle "Black" fonts.
Fixed a bug in the PostScript-type function parser -- real numbers
  that start with a decimal point weren't being handled correctly.
Changed the way filled-and-stroked text is handled -- use Splash to do
  both the fill and the stroke (rather than using the font ending to
  do the fill and Splash to do the stroke); also turn off stroke
  adjustment when drawing stroked text.
Ignore generation numbers on compressed objects (to match Adobe's
  behavior).
Changed the PostScript PageSize policy from 3 to 6 (choose next
  largest paper size, don't rescale).
Check that the mask values for color key masked images are in range --
  both Ghostscript and Distiller choke on the PostScript if invalid
  mask colors are specified.
Fixed a bug in generic region decoding in the JBIG2 decoder.
Fixed the lexer to handle large real numbers correctly.
Pdftops wasn't correctly handling tiling patterns that use both fill
  and stroke operators.
Report an error if the Size array in a sampled function includes any
  zeros.
The PostScriptFunction.codeString field wasn't being initialized
  correctly.
Invalid object streams were not being handled correctly.
Check for loops in xref tables.
Handle the case where a content stream ends after the 'ID' operator
  which starts inline image data.
Check for invalid object streams (i.e., an object stream can't be
  inside another object stream.
Add a recursion limit to the object parser - this avoids stack
  overflows with various sorts of damaged PDF files.
Handle various parameter settings in the extended graphics state
  dictionary.
An invalid document outline (missing fields) could cause a crash.
Added an overprint preview mode (for CMYK output only).
Correctly handle FitH/BH/V/BV link destinations that contain null
  values for positioning parameters.
If the PDF file doesn't define a BaseURI, set one based on the
  location of the PDF file -- this allows relative links to be handled
  correctly.
Use ResusableStreamDecode when generating Level 3 PostScript for an
  explicitly masked image.
Tweak the Type 1 font parser to handle encodings with multiple
  characters on one line.
Invert subtractive color components before passing them to the
  blending function.
Fix an invalid array access in SplashOutputDev::setSoftMask() in CMYK
  mode.
A PS interpreter may attempt to read past the end of a preloaded
  image, so we need to check for that.
Fixed several overflow/uninit bugs in JBIG2Stream.
Fix the CCITTFax decoder to correctly find end-of-file (RTC/EOFB)
  markers when the EndOfLine parameter is false.
Don't limit the startxref offset to 10 digits - some PDF generators
  use extra leading zeros.
Use the "DV" (default value) field in text annotations if the "V"
  (value) field is missing.
Increase the number of digits printed for floating point numbers in
  PostScript output -- it was running into numerical accuracy problems
  on large pages.
Fixed integer overflow bugs in Catalog.cc and GfxFont.cc.
Zero-length tables in TrueType fonts should be treated as missing.
ToUnicode CMaps map char codes to Unicode; .cidToUnicode files map
  CIDs to Unicode -- ToUnicodeCMaps were being handled incorrectly.
Added the "psRasterResolution" and "psRasterMono" xpdfrc commands.
Added code to FoFiTrueType to check for entries in the table directory
  with bogus tags -- this handles the case where the number of tables
  given in the header is too high.
Negative shift values in the PostScript bitshift operator were being
  handled incorrectly.
GfxICCBasedColorSpace was not correctly bounds-checking the number of
  components.
Check SampledFunction input values for NaNs.
Fix a divide-by-zero when the page width or height is zero.
Fix a bug positioning text in PostScript output - if the last char in
  a string has an incorrect width in the PDF font object, that messes
  up the total string width, so we have to position individual chars.
In PostScript output, if CID font substitution fails, drop all text in
  that font.
Handle PDF files that set the stream/string decryption filters to
  Identity (i.e., no encryption).
Avoid passing a zero font size to FreeType.
Tweak raw mode in the text extractor to handle words on the same line
  drawn in the wrong order.
Pdftops was generating a singular transform matrix for annotations
  whose bounding boxes had zero width or height.
Handle embedded OpenType CFF fonts with CIDToGIDMaps.
Remove the old kludge from PSOutputDev that was converting char 32
  from ".notdef" to "space".
Allow CCITTFax images to be more than 32k pixels wide.
Modified the CMap parser to handle usecmap with Identity-H/V.
Added some parameter checking in the JPX decoder.
Added checks for infinite loops in PDF objects - for color spaces,
  functions, optional content, and outline items.
Add support for mouse button bindings up to button 32 (old limit was
  7).
Fixed a bug in the decryption code for revision 3 with keyLength < 16
  -- the owner password was not being handled correctly.  [Thanks to
  Matthias Franz.]
Optimize SampledFunction: pull index computation code out of the
  transform function; cache the last transform.
Tweaked the font naming algorithm in PSOutputDev.
Treat mirrored (as opposed to rotated) text the same as upright text
  in pdftotext.
Fixed buffer overflows in Splash and SplashBitmap.
Check for bogus character codes (e.g., <ffffffff>) in ToUnicode CMaps.
The radial shading code (in both Gfx.cc and PSOutputDev.cc) was not
  computing the s bounds properly.
Drop empty subpaths in clip and fill (but not stroke) operations -
  this can significantly speed up clip performance in the weird case
  where a PDF file does "<x> <y> <w> <h> re <x> <y> m h W n".
Added code to FoFiTrueType to check for an invalid loca format field
  in the head table.
The axial shading code (in Gfx.cc, but not PSOutputDev.cc) was not
  computing the incremental polygon vertices correctly.
Set the character width in TextOutputDev to something sensible for
  vertical fonts.
Added basic support to the text extractor for vertical writing mode.
The non-interactive tools (pdftotext, pdftops) now free Page objects
  after using them, avoiding performance problems with pages that have
  huge resource dictionaries.
Check for line dash arrays like [0], and draw nothing at all (to match
  Acrobat's behavior).
Add a sanity check for the ascent/descent values in FontDescriptors.
Single-point paths with a line dash were causing a crash.
Correctly handle Level 3 PostScript output with masked images inside
  patterns.
Tweaked the xref repair code so that it runs if the catalog is messed
  up (in addition to running if the xref table is damaged).
If Indexed color space tables (streams or strings) are too small,
  reduce the max index instead of throwing away the color space.
Change the CMap parser to allocate memory only when it sees a mapping,
  not when it sees a 'codespacerange' declaration -- this avoids
  allocating huge amounts of memory for CMaps with large, unused
  codespaceranges.
In monochrome mode, treat lines with width <= 1 as hairlines (to match
  Acrobat's behavior).
Cache the last transform for PostScript-type functions.
Added the "-rawdates" option to pdfinfo.
Optimized ImageStream::getLine().
Fixed the Hue, Saturation, Color, and Luminosity blend functions to
  match Adobe's spec.
Fixed the non-isolated group compositing computation.
Skip extraneous unused data at the end of JBIG2 segments.
Change the algorithm that stroke/fill adjustment uses so that the
  edges of adjacent strokes/fills line up.
Do stroke adjustment on end caps when cap style is butt or projecting.
Fixed a security hole: Gfx.parser was not being initialized to NULL.
Fixed a security hole: integer bounds check in the Type 1 encoding
  parser in FoFiType1.cc.
If an embedded font object is invalid or non-existent, do font
  substitution (same as if there were no embedded font).
TextOutputDev was reusing an old font in the case where the font
  changed but the font size and character positioning stayed the same.
When starting a transparency group, copy the fill/stroke colors from
  the graphics state.
Tweaked the fixed-point code.
When a TrueType font is declared resident (with a psFont command),
  don't munge the encoding.
Look for URIs starting with "www." and treat them as absolute "http:"
  URIs, not as relative URIs (to match Adobe's behavior).
Added code to FoFiTrueType to check for a zero-entry cmap table.
Tweaked the font substitution code to do a better job of scaling the
  substituted font.
Require at least two splits in the axial shading color bisection.
Optimized JBIG2Stream::readGenericBitmap().
JPXStream wasn't correctly handling row padding for images with fewer
  than 8 bits per component.
Optimized the ToUnicode CMap parser.
Added a "whole words only" option to text searches.
Check for valid component parameters in the DCT decoder.
Implement embedding of external 16-bit fonts (without subsetting) in
  PostScript output.
Added the minLineWidth xpdfrc command.
Added warning messages for font substitutions.

3.04 (2014-may-28)
------------------
New text extractor.
Added the pdftohtml tool.
Added the pdftopng tool.
New trapezoid-based rasterizer core (for performance).
Generate appearance streams for Line, PolyLine, and Polygon
  annotations.
Added the closeWindowOrQuit command, and changed the default binding
  for ctrl-W from closeWindow to closeWindowOrQuit.
Implemented the new AES-256 mode (R=6, Acrobat X).
Add an object cache.
Added a small cache for object streams.
Modify PSOutputDev to use LZW compression instead of RLE, with a
  fallback to RLE if the "psLZW no" setting is given.
Pdfinfo now prints page rotation info.
Modified ImageOutputDev, used by pdfimages, to output the masks and
  soft masks used when drawing images.
Remove non-printable characters from error output, just in case they
  might cause problems for the terminal program.
Added initial support for Code3of9 bar codes in XFA forms.
Added the mapExtTrueTypeFontsViaUnicode xpdfrc command.
Apply stroke adjustment to rectangular images and clipping regions (in
  addition to strokes and fills).
Decode JPEG 2000 images at less than full resolution if the full res
  image isn't needed (i.e., if the raw image is higher resolution than
  the output).
Implemented knockout groups.
Removed t1lib support.
Added support for images with 16-bit components.
Rewrote the Dict class to use a hash table; as a side effect, this
  handles dictionaries with multiple definitions for a key, which are
  in violation of the spec, but Acrobat appears to handle.
The transformed line width computation -- used to implement the
  minLineWidth setting, and the hairline threshold in monochrome mode --
  was incorrect.
Pdftops was not correctly handling the case where it couldn't find
  a 16-bit font -- this led to crashes and/or invalid PostScript.
A bug in FlateStream::getBlock() was causing problems with narrow
  images.
Use the correct _WIN32 define instead of WIN32.
Use copy-on-write for the clip path in SplashState (when doing gsave),
  for performance.
Added a Solaris-specific entry to the ghostscript font search path.
SplashState was initializing line width to 0 instead of 1.
Abort processing on a content stream after getting 500 errors
  (undefined operator, wrong number of args) -- this avoids very long
  processing time for malicious PDF files using bogus RLE encoded
  content streams.
Added the psUseCropBoxAsPage xpdfrc option; "pdftops -pagecrop" now
  sets psUseCropBoxAsPage; "pdftops -pagecrop -paper match" now uses
  the CropBox as the page size.
Re-architected the AcroForm support code into a separate AcroForm
  module.
Fixed the handling of overprinting/transparency interaction, using
  the CompatibleOverprint blend mode.
The TIFF predictor code for the 1-bit-per-pixel case was broken.
For triangle and patch mesh shadings (types 4-7) with color functions,
  interpolate the function parameter not the color.
Check the fontFile/fontDir commands before (instead of after) doing
  Base-14 substitution in PS output.
Correctly handle non-embedded TrueType fonts that have an Identity
  ToUnicode mapping (display and PS output were failing).
Added support for XFA form rendering, including an "enableXFA" xpdfrc
  setting.
Handle PFB Type 1 fonts when generating PostScript output.
Unwind any extraneous saved graphics state at the end of the page
  (before drawing annotations).
Added some integer overflow checks in the GString class.
Handle 16-bit components in JPEG 2000 images.
ActualText spans can end without a valid font, in which case
  TextPage::beginWord was crashing.
The Domain entry in function shadings wasn't being parsed correctly.
Fixed a bug in the JPEG decoder - successive approximation
  (progressive mode) coefficients weren't being handled correctly.
Added a better infinite loop test to the xref parser.
When generating PostScript, merge reused TrueType fonts (if their
  code-to-GID mappings are the same).
Tweak the Gouraud triangle shaded fill code to end the recursive
  splitting if the triangles get sufficiently small.
Do bilinear interpolation when upsampling images.
When skipping extraneous image data from an inline image, look for
  EI<whitespace> instead of just EI.
When writing to stdout on Windows, pdftoppm now sets the file mode to
  binary.  [Thanks to Robert Frunzke.]
Accept strings as well as names for the BaseFont entry in font
  objects.
Removed the TEXTOUT_WORD_LIST config option (with the new text
  extractor, this is always enabled).
Fixed a bug in the JBIG2 decoder (the TPGD context for template #3 in
  readGenericBitmap was incorrect).
Rewrote the PostScriptFunction code for performance.
Handle 8-bit OpenType CFF fonts that are missing required tables in
  the OpenType wrapper.
Handle tiling patterns with reversed coordinates in their bounding
  boxes.
Added support for 64-bit file offsets, i.e., PDF files larger than
  2GB.
Optimize the code that rasterizes pattern-filled image masks.
Added support for Mac OS X system fonts (Base-14 only).
The backdrop color in luminosity-type soft mask groups was not being
  handled correctly.
Modified behavior of "pdftops -paper match -duplex ..." - it will now
  duplex consecutive same-sized pages.
Tweak the handling of degenerate fills ('moveto lineto fill') to
  match Adobe.
Don't honor the OPM=1 setting with ICCBased CMYK color spaces.
Whole-word searches were treating certain punctuation (Unicode number
  separators and terminators) as part of the word, e.g., searching for
  "foo" would not match "foo,".
Use the TextString class everywhere it makes sense.
Removed the unnecessary segment sort in Splash (performance
  optimization).
Handle hyperlinks that use Widget-type annotations.
Fix up the integer overflow checks to avoid issues with clever
  compilers.  [Thanks to Nickolai Zeldovich.]
Correctly handle streams with missing Length entries in damaged PDF
  files.
Added a compile-time option (LOAD_FONTS_FROM_MEM) to load fonts from
  memory rather than temporary files on disk.
Added the psRasterSliceSize xpdfrc option.
Fixed a case in the JPEG 2000 arithmetic decoder where extra data is
  present in packet i, and needs to be saved for use in packet i+1.
Fixed a bug in the JPEG 2000 decoder related to images with fewer than
  8 bits per component.
Handle the case in PSOutputDev where slice size overflows a 32-bit
  integer.
Add (partial) support for TrueType cmap format 2.
Always pass FT_LOAD_NO_BITMAP to FreeType -- bitmaps apparently fail
  with rotated characters.
Support fonts specified in ExtGState dictionaries.
Annotations with empty Border arrays should not draw a border.
Fix the CMap parser to handle large CID ranges.
Check for Type 3 CharProcs that call q or Q before the d0/d1 operator,
  and treat them as uncacheable.
Invert the selection color when starting in reverse video mode.
Device{Gray,RGB,CMYK} cannot be mapped via a resource dict.
Changed the PS output for masked images (explicit and color key
  masking): use a plain old clip path instead of rectclip to avoid
  array overflows.
Check the StemSnapH/V arrays when converting Type 1C fonts to Type 1 -
  if there are any duplicate or out-of-order values, skip that
  StemSnapH/V array.
Added the psMinLineWidth xpdfrc setting.
Fix an obscure issue in converting TrueType fonts to Type 42, related
  to empty glyph descriptions (12 zero bytes).
Pdftops now reports an error if there were any I/O errors writing to
  the PS output file.
Fix vertical text (CJK fonts) in PS output -- offset the character
  origin correctly.
Increased the number of digits used by pdfimages for the image number
  from three to four.
Handle right-to-left (e.g., Arabic) ligatures correctly in the text
  extractor.
Added the -loc and -locPS options to pdffonts.
Extend the object parser recursion limit to cover Stream::addFilters()
  / Stream::makeFilters() - to avoid another possibility of stack
  overflow.
Disable FreeType autohinting, because it can fail badly with font
  subsets that use invalid glyph names -- except in the case of Type 1
  fonts, which look much better with light autohinting.
Modified the rasterizer pipeline functions to process a scan line at a
  time (for performance).
Removed VMS build support (it hasn't been updated in ages).
Removed pdftotext's '-htmlmeta' option (use pdftohtml instead).
PSOutputDev's font/form setup code, and pdffonts, were not scanning
  soft mask groups in ExtGState dictionaries.
Invalid DCT input (e.g., from a damaged PDF file) could overflow the
  dctClip array.
When upsampling an image mask or image with a large resulting image
  size, do it in stream mode instead of prescaling the whole image
  (to avoid running out of memory).
Added infinite loop detection to pdffonts.

4.00 (2017-aug-10)
------------------
Complete rewrite of the xpdf GUI, using Qt instead of Motif.
Multithreaded rasterization in the viewer - pages are now rasterized
  in a separate thread so that scrolling and other UI activity is not
  blocked.
Added a linear text selection mode.
Limit transparency groups to the clip rectangle (performance
  optimization).
Optimized the SplashScreen code, used in 1-bit monochrome mode.
Added setmode calls to pdftopng, when writing to stdout on Windows.
  [Thanks to Robert Schroll.]
Regenerate the appearance stream for an AcroForm field if there is
  no appearance stream, even if NeedAppearances isn't set.
When regenerating AcroForm field appearance streams, use a default
  font (Helvetica) for fields that don't have a valid font.
When the line width is increased by the minLineWidth setting, force
  the line join mode to "bevel" to avoid "whiskers" at sharp corners.
Change the pdftoppm/pdftopng resolution (-r) argument from an integer
  to floating point.
Use the FontDescriptor 'CapHeight' value in place of 'Ascent' if it's
  available.
OC (optional content) entries in image XObjects were being ignored.
Added support for preblended soft-masked images.
Added optional support for using libjpeg to decode DCT (JPEG)
  streams.
Transparency groups weren't being composited correctly in mono1 mode.
Switched to a different IDCT transform in the DCT (JPEG) decoder, to
  get better accuracy; the new transform is also a bit faster.
Modified the polygon scan converter to avoid O(n^2) performance, which
  can get really bad with paths that have extremely large numbers of
  segments.
Added the maxTileWidth, maxTileHeight, tileCacheSize, and
  workerThreads xpdfrc settings.
Modified PSOutputDev so it doesn't output resources (fonts, etc.) for
  pages that are rasterized (because they use transparency).
Added the -alpha flag to pdftopng.
Handle TrueType fonts with out-of-bounds loca entries.
Optimize consectutive "q" (gsave) operations in PostScript output.
Various improvements to the XFA rendering code.
Added the -nodiag flag to pdftotext.
Switched to cmake instead of autoconf.
Look for Widget-type annotations that aren't attached to the
  AcroForm, and add them to the AcroForm.
Added the "-z" option to pdftohtml.
The JPEG 2000 decoder now treats invalid boxes after the image
  codestream as non-fatal errors.
Improved the handling of drop caps in pdftohtml.
Added the "psNeverRasterize" setting.
Pdftohtml now converts invisible PDF text to transparent HTML text.
Check for zero-width/height bitmaps in the JBIG2 decoder -- these can
  happen in corrupted JBIG2 streams.
Pdfimages was inverting 1-bit monochrome images.
Added CCITTFaxStream::getBlock() to speed up the CCITTFax decoder.
Added resolution info to PNG files generated by pdftopng.
The DCT decoder now ignores non-Adobe APP14 markers (rather than
  generating an error).
Regenerate appearance streams for FreeText annotations.
The TextString class now handles UTF-16LE in addition to UTF-16BE.
  (UTF-16LE isn't allowed by the PDF spec, but I've seen it used.)
Added the simple one-column text extraction mode (pdftotext -simple).
Added a -cmyk option to pdftoppm to write CMYK PAM files.
Modified pdfinfo to output "static XFA" or "dynamic XFA", rather than
  just "XFA".
Added the "drawFormFields" xpdfrc command.
Various performance optimizations in the rasterizer.
Fixed the tiling pattern code to avoid stripes between pattern cells,
  and to honor the TilingType flag.
Always split axial shadings into 256 slices.
Handle the case where an optional content block is left open at the
  end of a page content stream.
Accept code-to-CID-type CMaps as ToUnicode CMaps (to work around buggy
  PDF generators).
Unicode-to-unicode maps weren't working correctly with fonts that have
  an "Identity" encoding.
Modify the lexer to interpret "--123.4" as -123.4, "--123" as 0, and
  "123-45" as "123" to match Adobe's behavior.
The text extractor now reverses the order of side-by-side columns for
  right-to-left scripts.
Worked on right-to-left script support in pdftohtml (still not
  complete).
Switched the default display mode to continuous (from single page).
Added the "-bom" switch to pdftotext.
Share font objects when multiple font tags point to the same object.
The transfer function goes before alpha blending in the rasterizer
  pipeline.
Added the "-allinvisible" switch to pdftohtml.
Added overprint mode (OPM) support in Level 3 PostScript output.
Added support for DeviceN color spaces in Level 3 PostScript output.
Added the "-userunit" option to pdftops.
Added the "-raw" and "-list" options to pdfimages.
Pdfimages now writes PGM files (instead of PPM files) for DeviceGray
  and CalGray images.
Added grayscale PostScript output -- added the '-level2gray' and
  '-level3gray' switches to pdftops.
Fix up Type 1 fonts when embedding in PostScript.
Added the "problematic" column to pdffonts output.
Generate an appearance stream for signature fields in AcroForms.
Correctly handle line dash patterns with zero-length segments when the
  line cap is butt or project.
Added the "strokeAdjust cad" xpdfrc option; fixed some issues with
  stroke adjustment and projecting line caps.
Added support for Code128B bar codes in XFA forms.
Look at both the ON and OFF arrays in the default OCCD (optional
  content config dict), to work around certain broken PDF files.
Added support for XFA 'numericEdit' fields.
Added support for 'picture' formatting in XFA forms.
Added mouseClickN events (in addition to mousePressN and
  mouseReleaseN).
External CID OpenType CFF fonts should map through Unicode (similarly
  to external CID TrueType fonts).
Handle axial and radial shadings in SplashOutputDev, in device space.
Use the PDF 2.0 inline image length field.
Handle duplicate embedded Type 1 font names in PostScript output.
Handle the case of a stroked closed path with a dash pattern -- if the
  dash pattern is "on" at both the start and end of a subpath, it
  should be joined.
If the line dash phase is negative, add a multiple of 2x the total
  dash length.
Indexed color space indexes should be clipped to [0,hival].
Fix the handling of the text render mode with Type 3 fonts, in the
  rasterizer and in PostScript output.
CID font metrics shouldn't be sorted - the PDF 2.0 spec says that, in
  the case of duplicate entries, the first entry should be used.
PSOutputDev now converts tiling patterns to PostScript tiling patterns
  (in Level 2/3).
Fixed a security hole in SecurityHandler.cc (uninitialized variables).
  This vulnerability was discovered by Kushal Shah of Fortinet's
  FortiGuard Labs.
Fixed a security hole in Function.cc (write past end of array).
Fixed a security hole with the use of d0/d1 operators outside of a
  Type3 CharProc [CVE-2016-9027].

4.01 (2019-feb-18)
------------------
Added remote server mode back into xpdf.
Add support for Unicode file names for the command line tools on
  Windows.
Added the tabStateFile setting, the saveTabState/loadTabState
  commands, and the "-tabstate" switch to xpdf.  [Thanks to Christian
  Barthel for the suggestion.]
Added the defaultPrinter xpdfrc setting.
Removed the psFile xpdfrc option (should have been removed in the 4.00
  release).
Tweaked the TrueType encoding/cmap code again, to get closer to the
  PDF 2.0 spec, and to fix a problem (difference between Xpdf and
  Adobe) with a specific PDF file.
Optimized transparency group rasterization: only composite the part of
  the group bitmap that was modified.
If vector antialiasing is disabled, use the narrow stroke code for
  lines less than one pixel wide.
Do not map through Unicode for non-embedded CID TrueType fonts with
  encoding = Identity-H and char collection = Adobe-Identity -- this
  matches Adobe's behavior on a somewhat common case.
The CCITTFax decoder now aborts after 1000 error messages, avoiding
  problems with huge data expansion for badly corrupted CCITTFax
  streams.
The xref loop detection code was only looking at xref tables, and not
  xref streams.  (CVE-2018-7174)  [Thanks to skysider for the bug
  report.]
The JPX decoder wasn't checking to make sure the number of components
  is non-zero.  (CVE-2018-7175)  [Thanks to skysider for the bug
  report.]
Modify the lexer to accept leading '+' signs on numbers.
Pdftohtml wasn't setting the background image width/height attributes
  correctly for rotated pages.
Ignore color-setting operators in cached Type 3 characters.
Support color-key masking in Level3Gray PS output with preload.
Xpdf was crashing on zero-page PDF files.
Added the unicodeRemapping xpdfrc option.
Change the cursor when the mouse is over text (in linear selection
  mode).
Support external OpenType CFF fonts for PostScript output.
Handle choice-type AcroForm fields that have separate display values
  and export values.
Increased the supported PDF version from 1.7 to 2.0.  (This isn't a
  change in functionality.  The code was already in place -- I just
  forgot to bump the PDF version number.)
Added the dropFont xpdfrc option.
Added support for PDF417 barcodes in XFA forms.
Modified pdfinfo to look at both the Info dict and the XML metadata.
Check for invalid line cap/join values.  [Thanks to
  fish@360TeamSeri0us for the bug report.]
Modified the object stream cache to hold onto more object streams, if
  they're being used.
Don't look at the "DV" (default value) key in AcroForm fields -- that
  should only be used when a form is explicitly reset.
Accept 8-byte values in xref streams.
Two DCTStream bugs: don't allow SOF headers between progressive scans;
  check for invalid Huffman table indexes.  [Thanks to
  fish@360TeamSeri0us for the bug reports.]
Check for uses of the scn/SCN operators with no arguments.  [Thanks to
  fish@360TeamSeri0us for the bug report.]
Correctly handle indexed color spaces with empty lookup tables.
  [Thanks to fish@360TeamSeri0us for the bug report.]
Support large bitmaps (>4GB) on 64-bit systems.
Soft masks are always isolated.
When "undoing" preblended image/softmask data, clip the resulting
  color values to avoid problems with incorrect data.
Set the default text encoding to UCS-2 in Xpdf, so that copying to the
  clipboard works as expected.
Added a sanity check for JBIG2 symbol height.  (CVE-2018-7173)
  [Reported by skysider.]
Check for uninitialized value in JPXStream::fillReadBuf.
  (CVE-2018-7452)  [Thanks to skysider for the bug report.]
Don't try to load an XFAForm if the PDF file has zero pages.
  (CVE-2018-7454)  [Thanks to skysider for the bug report.]
Check for invalid line cap/join values.  (CVE-2018-16368)  [Thanks to
  fish@360TeamSeri0us for the bug report.]
If the page count is greater than 50k, rescan the page tree and count
  the pages.  This prevents long load times where various tools try to
  read pages 1 through n.  (CVE-2018-18651)  [Thanks to krace for the
  bug report.]
Handle a null font name in PSOutputDev::setupEmbeddedType1Font.
  [Thanks to r4xis for the bug report.]
Check for invalid quant table indexes in the DCT decoder.  [Thanks to
  r4xis for the bug report.]

4.01.01 (2019-mar-14)
---------------------
The PDFDoc(BaseStream) initializer wasn't working correctly.
Fixed a missing array bounds check in PSOutputDev.  [Thanks to
  Loginsoft for the bug report.]
If the "U" string used for RC4 decryption is short, Adobe apparently
  zero-pads it, so Xpdf now does the same.
Pdffonts now checks more carefully for loops between objects.
Fixed a problem parsing large real numbers.  [Thanks to Loginsoft for
  the bug report.]

4.02 (2019-sep-25)
------------------
Pdftohtml now extracts embedded fonts (TrueType and CFF only).
Added the margin settings (-marginl -marginr -margint -marginb) to
  pdftotext.
Various user interface tweaks:
  - added a toolbar button to toggle (show/hide) the sidebar
  - added view menu items to toggle (show/hide) the sidebar and
    toolbar
  - added the 'showToolbar', 'hideToolbar', 'toggleToolbar',
    'expandSidebar', and 'shrinkSidebar' commands
  - added the 'initialDisplayMode', 'initialToolbarState', and
    'initialSelectMode' xpdfrc settings
  - rearranged the xpdf toolbar
Implemented drag-and-drop, so that PDF files can be drag-and-dropped
  onto an already-open xpdf window.
Added the option to display page labels, rather than page numbers.
Implemented the missing 'openInNewWin' command.
Added the 'openFileIn', 'openFileAtDestIn', 'openFileAtPageIn', and
  'openIn' commands; removed the 'openInNewWin' command.
Added the '-open' switch to xpdf.
Added the reverseVideoInvertImages setting.
Page-up and page-down now "snap" to the nearest page, if it's within a
  few pixels.  This avoids annoying behavior when the window is a tiny
  bit too short or too tall for a page.
Properly handle overprint in non-isolated transparency groups.
Missing null check in Gfx::opSetExtGState().  [Thanks to
  pwd@360TeamSeri0us for the bug report.]
The DCT decoder doesn't handle a sampling factor of 3 -- check for
  this and report an error.  [Thanks for Agostino Sarubbo of Gentoo
  for the bug report.]
Check for images with a Pattern color space, and report an error.
  [Thanks to TeamSeri0us for the bug report.]
Check that the Width, Height, and BitsPerComponent are valid in image
  soft masks.  [Thanks to TeamSeri0us for the bug report.]
Check for zero page width/height in PSOutputDev.  [Thanks to
  TeamSeri0us for the bug report.]
Check for divide-by-zero in PostScript functions.  [Thanks to
  TeamSeri0us for the bug report.]
Properly handle overprint in shading pattern strokes.
The "save image" feature in Xpdf wasn't getting the user-specified
  page number correctly.
PostScript doesn't support progressive or non-interleaved DCT (JPEG)
  streams, so check for those and re-encode them in PS output.
Splash now caches the most recent scaled image, in case it is
  immediately reused -- this results in a significant speedup in
  certain cases.
Fixed a problem with parsing the TrueType loca table.  [Thanks to
  Pangu Lab for the bug report.]
Fixed a problem with int overflow on image bounds.  [Thanks to
  Pangu Lab for the bug report.]
Fixed a problem with TrueType font parsing where there is gibberish in
  the TrueType table directory.  [Thanks to Pangu Lab for the bug
  report.]
Fixed a problem with JPX image resolution reduction.  [Thanks to Pangu
  Lab for the bug report.]
Fixed a problem with non-isolated transparency groups in 1-bit
  monochrome mode.  [Thanks to Pangu Lab for the bug report.]
Fixed various bugs in FoFi.  [Thanks to Pangu Lab for the bug
  reports.]
Added a missing bounds check to Annot::setFillColor().  [Thanks to
  Pangu Lab for the bug report.]
Added a check on the DCT quant table selector.  [Thanks to Pangu Lab
  for the bug report.]
Fixed a problem with the Type 3 font cache running out of entries.
  [Thanks to Pangu Lab for the bug report.]
Fixed an integer overflow bug in SampledFunction.  [Thanks to Pangu
  Lab for the bug report.]
Fixed an integer overflow bug in the tiling pattern size.  [Thanks to
  Martin Muskens at Ergosoft for the bug report.]
Fixed a read-past-end-of-buffer in the Type 1 font parser.  [Thanks to
  Pangu Lab for the bug report.]
Fixed an int overflow bug in the JBIG2 decoder.  [Thanks to
  TeamSeri0us for the bug report.]
Added a missing bounds check to GfxPatchMeshShading::parse().  [Thanks
  to TeamSeri0us for the bug report.]
JPEG 2000 tile indexes were being computed incorrectly.  [Thanks to
  TeamSeri0us for the bug report.]
Large sample separation values in a JPX stream were resulting in
  zero-width/height tiles, which caused problems.  [Thanks to Pangu
  Lab for the bug report.]
The XFA parser now looks for "ancestor matches" when searching for
  data to fill a form field.
Fixed an uninitialized variable in BuiltinFontWidths::getWidth().
  [Thanks to Martin Muskens at Ergosoft for the bug report.]
If there are no popupMenuCmd instances, construct a popup menu with
  basic instructions pointing to 'popupMenuCmd'.
Ignore color operators in uncolored tiling patterns.  [Thanks to
  Martin Muskens at Ergosoft for the bug report.]
Pdftotext raw mode output looks for space characters.
Increased the width of the font name column in the pdffonts output.
Function objects weren't checking their input/output counts properly.
  [Thanks to Pangu Lab for the bug report.]
TextPage::findGaps() wasn't checking the x/y min/max values for int
  overflow.  [Thanks to Taolaw for the bug report.]

4.03 (2021-jan-28)
------------------
Implemented selection extension via shift-click, and word/line
  selection via double/triple click.
Added default bindings for ctrl-mousewheel-up/down to zoom in/out.
Added the "-nofonts" option to pdftohtml.
Added the "simple2" mode to pdftotext.
Added the "-rot" flag to xpdf, pdftoppm, and pdftopng.
Added the "-listencodings" flag to pdftotext.
Added the 'copyLinkTarget' command.
Added the 'selectionColor' xpdfrc setting.
Added the 'initialSidebarWidth' xpdfrc setting.
Added support for @"..." strings in xpdfrc files.  This includes using
  '%' as an escape character, and also the '${DATADIR}' variable.
Added a help menu item that shows all of the key bindings.
Reorganized the gradient shading rasterization code to avoid
  transparency artifacts between triangles/patches.
Use interpolation rather than subdivision to rasterize Gouraud
  triangle shadings.
Allow escaping (via the \x01 character) in command args, so that "xpdf
  -open foo(123).pdf" works correctly.
Extended the damaged file repair code to handle PDF files that use
  xref streams and object streams.
Modified pdfinfo to print the encryption algorithm used (if any).
Handle Windows shortcut (.lnk) files in Xpdf and in the command line
  tools.
Display an error dialog when trying to copy text from a protected
  file.
Updated all four of the CJK language support packages with the latest
  Adobe data.
Modified pdftohtml to draw 'invisible' text over non-horizontal words.
Catalog.pageLabels wasn't being properly initialized to NULL.  [Thanks
  to Dhiraj for the bug report.]
Added a sanity check for JBIG2 symbol width.  [Reported by Marc
  Schoenefeld.]
Fixed a bug in the fontconfig calls that was causing Xpdf to crash.
The Type 3 font cache code wasn't correctly handling the case where a
  Type 3 char refers to another char in the same T3 font.  [Thanks to
  Pangu Lab for the bug report.]
Xpdf was crashing if 'view page labels' was enabled without any
  document open.  [Thanks to TeamSeri0us for the bug report.]
The Type 1C-to-Type 1 font converter wasn't checking for
  divide-by-zero with rational numbers.  [Thanks to TeamSeri0us for
  the bug report.]
Fixed a bug in the TrueType font parser - zero-length loca tables
  weren't handled correctly.  [Thanks to TeamSeri0us for the bug
  report.]
Fixed an integer overflow bug in the transparency group setup code.
  [Thanks to TeamSeri0us for the bug report.]
Pdfinfo with the "-box" option was crashing on zero-page PDF files.
  [Thanks to TeamSeri0us for the bug report.]
The code that caches scaled images wasn't checking the rendering
  intent.  [Thanks to Martin Muskens at Ergosoft for the bug report.]
The JBIG2 decoder now checks for gibberish values in various segment
  headers, but keeps any data decoded prior to that.
Fixed two bugs in the FoFi code that handles CFF fonts.  [Thanks to
  dsmic for the bug report.]
Redesigned the image scaling code, for performance.
Cleaned up the code that sanity-checks font sizes to avoid trying to
  allocate too much memory for the font cache.
Implemented precincts in the JPEG 2000 decoder.
The page-up/down snapping code was calling TileMap::getPageTopY() with
  invalid page numbers.  [Thanks to dfandrich for the bug report.]
Added missing error-checking when parsing an annotation appearance
  stream's bbox.
Handled UTF-16 sequences in ToUnicode maps.
Rewrote the code that draws static XFA forms: combined it with the
  AcroForm code, to match Adobe's behavior.  Removed the enableXFA
  xpdfrc setting.
Check for indirect references in content streams and report an error.
Doing overprint preview in tiling patterns requires tracking the
  overprint mask at each pixel.
Check for "decompression bombs" in Flate and LZW streams.
The nextPageNoScroll and prevPageNoScroll commands weren't working
  correctly in continuous mode.
Disable stroke adjustment when drawing Type 3 characters.
The "xpdf -open" flag now constructs an absolute path, so it's not
  dependent on the current directory when xpdf was started.
Check for infinite loops in Type 1C charstring subroutines.  [Thanks
  to blbi for the bug report.]
Fixed an incomplete test for headless CFF files.  [Thanks to Chengbin
  for the bug report.]
Tweaked the code that computes segment slope in SplashXPath.cc to
  avoid problems with extremely small coordinate values.  [Thanks to
  Chengbin for the bug report.]
Check for an invalid segment length in PSOutputDev's PFB parse.
  [Thanks to Chengbin for the bug report.]
Check for JPEG 2000 segments that are only allowed in the first
  tile-part of a tile.  [Thanks to Chengbin for the bug report.]
Check for invalid AcroForm ListBox field top index.  [Thanks to
  Chengbin for the bug report.]
Check for invalid mesh shading parameters.  [Thanks to Chengbin for
  the bug report.]