static size_t ReadPAMFields()

in Extended/libwebp/imageio/pnmdec.c [73:135]

• 62 lines of code
• 25 McCabe index (conditional complexity)

static size_t ReadPAMFields(PNMInfo* const info, size_t off) {
  char out[MAX_LINE_SIZE + 1];
  size_t out_size;
  int tmp;
  int expected_depth = -1;
  assert(info != NULL);
  while (1) {
    off = ReadLine(info->data, off, info->data_size, out, &out_size);
    if (off == 0) return 0;
    if (sscanf(out, "WIDTH %d", &tmp) == 1) {
      if (info->seen_flags & WIDTH_FLAG) return FlagError("WIDTH");
      info->seen_flags |= WIDTH_FLAG;
      info->width = tmp;
    } else if (sscanf(out, "HEIGHT %d", &tmp) == 1) {
      if (info->seen_flags & HEIGHT_FLAG) return FlagError("HEIGHT");
      info->seen_flags |= HEIGHT_FLAG;
      info->height = tmp;
    } else if (sscanf(out, "DEPTH %d", &tmp) == 1) {
      if (info->seen_flags & DEPTH_FLAG) return FlagError("DEPTH");
      info->seen_flags |= DEPTH_FLAG;
      info->depth = tmp;
    } else if (sscanf(out, "MAXVAL %d", &tmp) == 1) {
      if (info->seen_flags & MAXVAL_FLAG) return FlagError("MAXVAL");
      info->seen_flags |= MAXVAL_FLAG;
      info->max_value = tmp;
    } else if (!strcmp(out, "TUPLTYPE RGB_ALPHA")) {
      expected_depth = 4;
      info->seen_flags |= TUPLE_FLAG;
    } else if (!strcmp(out, "TUPLTYPE RGB")) {
      expected_depth = 3;
      info->seen_flags |= TUPLE_FLAG;
    } else if (!strcmp(out, "TUPLTYPE GRAYSCALE")) {
      expected_depth = 1;
      info->seen_flags |= TUPLE_FLAG;
    } else if (!strcmp(out, "ENDHDR")) {
      break;
    } else {
      static const char kEllipsis[] = " ...";
      int i;
      if (out_size > 20) sprintf(out + 20 - strlen(kEllipsis), kEllipsis);
      for (i = 0; i < (int)strlen(out); ++i) {
        // isprint() might trigger a "char-subscripts" warning if given a char.
        if (!isprint((int)out[i])) out[i] = ' ';
      }
      fprintf(stderr, "PAM header error: unrecognized entry [%s]\n", out);
      return 0;
    }
  }
  if (!(info->seen_flags & ALL_NEEDED_FLAGS)) {
    fprintf(stderr, "PAM header error: missing tags%s%s%s%s\n",
            (info->seen_flags & WIDTH_FLAG) ? "" : " WIDTH",
            (info->seen_flags & HEIGHT_FLAG) ? "" : " HEIGHT",
            (info->seen_flags & DEPTH_FLAG) ? "" : " DEPTH",
            (info->seen_flags & MAXVAL_FLAG) ? "" : " MAXVAL");
    return 0;
  }
  if (expected_depth != -1 && info->depth != expected_depth) {
    fprintf(stderr, "PAM header error: expected DEPTH %d but got DEPTH %d\n",
            expected_depth, info->depth);
    return 0;
  }
  return off;
}