readVCC.C

/*
  Filename: readVCC.c
    Author: Jeremy L. Crabtree <JeremyLC@GMail.com>
      Date: 20 July, 2014

   Purpose: This will read and extract the VOC/ACMP files embedded in
            the VCC container files used in Interplay's
            "Star Trek: Judgement Rites".  Decompressing the ACMP audio
            is a job for someone less lazy than me.

     Notes: Output files are dumped in pwd because I'm lazy. Run this from
            where you want the output.

   License: If you re-use this code (pity you!) give me credit, thanks! :)
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

/* The master record is in the same format as the individual file records */
typedef struct vccRecord
{
  unsigned char header[9];
  unsigned int offset, size;
} vccRecord;

int read4byteint(FILE * inFile)
{
  /* Read a 4 byte int that is stored LSB..MSB */
  unsigned char value[4];
  fread(value, 1, 4, inFile);
  return value[0] + (value[1] << 8) + (value[2] << 16) + (value[3] << 24);
}

void readRecord(FILE * inFile, vccRecord *rec)
{
  /*
    Read a 16 byte record.
    The first 8 bytes are text.
    The next 8 bytes are two 4-byte little-endian ints
  */
  rec->header[8] = '\x0'; //8 byte headers aren't null-terminated.
  fread(rec->header, 1, 8, inFile);
  rec->offset = read4byteint(inFile);
  rec->size = read4byteint(inFile);
}

void extractFile(vccRecord newFile, FILE *inFile)
{
  /* Extract a VOC/ACMP from the main VCC file */
  unsigned int savedPos;
  unsigned char *fBuf;
  FILE *outFile;

  if(outFile = fopen(newFile.header, "wb"))
    {
      savedPos = ftell(inFile);
      fseek(inFile, newFile.offset, SEEK_SET);
      fBuf = malloc(newFile.size);
      fread(fBuf, 1, newFile.size, inFile);
      fwrite(fBuf, 1, newFile.size, outFile);
      free(fBuf);
      fclose(outFile);
      fseek(inFile, savedPos, SEEK_SET);
    }
  else
    {
      printf("Error %d opening %s for output\n", errno, newFile.header);
      exit(errno);
    }
}

int main(argc, argv)
     int argc;
     char **argv;
{
  /* The rest of this should be self explanatory */
  unsigned int fileNum;
  vccRecord vccHead , fileRec;
  FILE *vccFile;

  if (2 == argc)
    if (vccFile = fopen(argv[1], "rb"))
        {
          readRecord(vccFile, &vccHead);
          if (strcmp(vccHead.header, "VOCFILES"))
            {
              fclose(vccFile);
              printf("Error %s is not a VCC file.\n", argv[1]);
              exit(1);
            }

          fseek(vccFile, vccHead.offset, SEEK_SET);
          for (fileNum = 0; fileNum < vccHead.size; fileNum++)
            {
              readRecord(vccFile, &fileRec);
              extractFile(fileRec, vccFile);
            }
          fclose(vccFile);
        }
    else
      {
        printf("Error %d opening %s\n", errno, argv[1]);
        exit(errno);
      }
  else
    printf("Usage %s <filename.vcc>\n", argv[0]);

  return 0;
}