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- /**
- * Copies a BMP piece by piece, just because.
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include "bmp.h"
- int main(int argc, char *argv[])
- {
- // ensure proper usage
- if (argc != 4)
- {
- fprintf(stderr, "Usage: ./copy infile outfile\n");
- return 1;
- }
- // remember filenames
- char *infile = argv[2];
- char *outfile = argv[3];
- int n = atoi(argv[1]);
- // open input file
- FILE *inptr = fopen(infile, "r");
- if (inptr == NULL)
- {
- fprintf(stderr, "Could not open %s.\n", infile);
- return 2;
- }
- // open output file
- FILE *outptr = fopen(outfile, "w");
- if (outptr == NULL)
- {
- fclose(inptr);
- fprintf(stderr, "Could not create %s.\n", outfile);
- return 3;
- }
- // read infile's BITMAPFILEHEADER
- BITMAPFILEHEADER bf;
- fread(&bf, sizeof(BITMAPFILEHEADER), 1, inptr);
- // read infile's BITMAPINFOHEADER
- BITMAPINFOHEADER bi;
- fread(&bi, sizeof(BITMAPINFOHEADER), 1, inptr);
- // ensure infile is (likely) a 24-bit uncompressed BMP 4.0
- if (bf.bfType != 0x4d42 || bf.bfOffBits != 54 || bi.biSize != 40 ||
- bi.biBitCount != 24 || bi.biCompression != 0)
- {
- fclose(outptr);
- fclose(inptr);
- fprintf(stderr, "Unsupported file format.\n");
- return 4;
- }
- int opadding = (4 - (bi.biWidth * sizeof(RGBTRIPLE)) % 4) % 4;
- bi.biWidth*=n;
- bi.biHeight*=n;
- // determine padding for scanlines
- int padding = (4 - (bi.biWidth * sizeof(RGBTRIPLE)) % 4) % 4;
- bi.biSizeImage = ((sizeof(RGBTRIPLE)*bi.biWidth)+ padding)*abs(bi.biHeight);
- bf.bfSize = bi.biSizeImage + sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
- // write outfile's BITMAPFILEHEADER
- fwrite(&bf, sizeof(BITMAPFILEHEADER), 1, outptr);
- // write outfile's BITMAPINFOHEADER
- fwrite(&bi, sizeof(BITMAPINFOHEADER), 1, outptr);
- // iterate over infile's scanlines
- RGBTRIPLE *arr = (RGBTRIPLE *)malloc((bi.biWidth/n) * (bi.biWidth/n) * sizeof(RGBTRIPLE)),*x;
- x = arr ;
- for(int a=0;a<(bi.biWidth/n);a++)
- {
- for(int b=0;b<(bi.biWidth/n);b++)
- {
- fread(arr, sizeof(RGBTRIPLE), 1, inptr);
- arr++;
- }
- fseek(inptr, opadding, SEEK_CUR);
- }
- arr = x;
- for (int i = 0, biHeight = abs(bi.biHeight); i < biHeight;)
- { for(int b=0;b<n;b++)
- { if(b!=0)
- {
- arr-= bi.biWidth;
- }
- // iterate over pixels in scanline
- for (int j = 0; j < bi.biWidth; )
- {
- // temporary storage
- for(int a=0;a<n;a++)
- {// write RGB triple to outfile
- fwrite(arr, sizeof(RGBTRIPLE), 1, outptr);
- j++;
- }
- arr++;
- }
- // then add it back (to demonstrate how)
- for (int k = 0; k < padding; k++)
- {
- fputc(0x00, outptr);
- }
- i++;
- }
- }
- // close infile
- fclose(inptr);
- // close outfile
- fclose(outptr);
- // success
- return 0;
- }
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