Function bm_iff_parse_file

bitmap/iff.cpp:369–472

read an PBM Pass pointer to opened file, and to empty bitmap_header structure, and form length

// read an PBM
// Pass pointer to opened file, and to empty bitmap_header structure, and form length
int bm_iff_parse_file(CFILE *ifile, iff_bitmap_header *bmheader, iff_bitmap_header *prev_bm) {
  uint32_t sig, len;
  int done = 0;

  while (!done) {
    if (cfeof(ifile)) {
      done = 1;
      continue;
    }

    sig = bm_iff_get_sig(ifile);

    len = cf_ReadInt(ifile, false);

    switch (sig) {
    case IFF_SIG_FORM: {
      int newsig = bm_iff_get_sig(ifile);
      bmheader->type = TYPE_PBM;
      break;
    }
    case IFF_SIG_BMHD: {
      int ret;

      ret = bm_iff_parse_bmhd(ifile, len, bmheader);
      if (ret != IFF_NO_ERROR)
        return ret;
      else {

        bmheader->raw_data = (uint8_t *)mem_malloc(bmheader->w * bmheader->h);
        if (!bmheader->raw_data)
          return IFF_NO_MEM;
      }

    } break;
    case IFF_SIG_ANHD: {

      if (!prev_bm) {
        Int3();
        return IFF_CORRUPT;
      }

      bmheader->w = prev_bm->w;
      bmheader->h = prev_bm->h;
      bmheader->type = prev_bm->type;
      bmheader->raw_data = (uint8_t *)mem_malloc(bmheader->w * bmheader->h);

      if (!bmheader->raw_data)
        return IFF_NO_MEM;

      memcpy(bmheader->raw_data, prev_bm->raw_data, bmheader->w * bmheader->h);

      if (len & 1)
        len++;
      bm_iff_skip_chunk(ifile, len);

      break;
    }