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webpinfo: fix fourcc comparison w/big-endian

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store the recognized fourccs in little-endian order to match how the
fourcc is being read from the file

Bug: webp:548
Change-Id: I9de77db92208709d5e711846908a51e563102fa5
(cherry picked from commit e3cb052ca5)
This commit is contained in:
James Zern 2021-12-22 13:42:50 -08:00
parent f035d2e40d
commit b217b4fff7
1 changed files with 18 additions and 12 deletions
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30
examples/webpinfo.c
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@ -125,16 +125,16 @@ static void WebPInfoInit(WebPInfo* const webp_info) {
memset(webp_info, 0, sizeof(*webp_info));
}
static const char kWebPChunkTags[CHUNK_TYPES][4] = {
{ 'V', 'P', '8', ' ' },
{ 'V', 'P', '8', 'L' },
{ 'V', 'P', '8', 'X' },
{ 'A', 'L', 'P', 'H' },
{ 'A', 'N', 'I', 'M' },
{ 'A', 'N', 'M', 'F' },
{ 'I', 'C', 'C', 'P' },
{ 'E', 'X', 'I', 'F' },
{ 'X', 'M', 'P', ' ' },
static const uint32_t kWebPChunkTags[CHUNK_TYPES] = {
MKFOURCC('V', 'P', '8', ' '),
MKFOURCC('V', 'P', '8', 'L'),
MKFOURCC('V', 'P', '8', 'X'),
MKFOURCC('A', 'L', 'P', 'H'),
MKFOURCC('A', 'N', 'I', 'M'),
MKFOURCC('A', 'N', 'M', 'F'),
MKFOURCC('I', 'C', 'C', 'P'),
MKFOURCC('E', 'X', 'I', 'F'),
MKFOURCC('X', 'M', 'P', ' '),
};
// -----------------------------------------------------------------------------
@ -644,7 +644,7 @@ static WebPInfoStatus ParseChunk(const WebPInfo* const webp_info,
return WEBP_INFO_TRUNCATED_DATA;
}
for (i = 0; i < CHUNK_TYPES; ++i) {
if (!memcmp(kWebPChunkTags[i], &fourcc, TAG_SIZE)) break;
if (kWebPChunkTags[i] == fourcc) break;
}
chunk_data->offset_ = chunk_start_offset;
chunk_data->size_ = chunk_size;
@ -939,7 +939,13 @@ static WebPInfoStatus ProcessChunk(const ChunkData* const chunk_data,
LOG_WARN(error_message);
} else {
if (!webp_info->quiet_) {
const char* tag = kWebPChunkTags[chunk_data->id_];
char tag[4];
uint32_t fourcc = kWebPChunkTags[chunk_data->id_];
#ifdef WORDS_BIGENDIAN
fourcc = (fourcc >> 24) | ((fourcc >> 8) & 0xff00) |
((fourcc << 8) & 0xff0000) | (fourcc << 24);
#endif
memcpy(tag, &fourcc, sizeof(tag));
printf("Chunk %c%c%c%c at offset %6d, length %6d\n",
tag[0], tag[1], tag[2], tag[3], (int)chunk_data->offset_,
(int)chunk_data->size_);