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roytam followup webp patch

This commit is contained in:
Cameron Kaiser 2023-09-17 22:55:38 -07:00
parent d43821e1f8
commit b1c0b3e0c7
2 changed files with 74 additions and 59 deletions
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25
media/libwebp/src/dec/vp8l_dec.c
View File

@ -364,11 +364,7 @@ static int ReadHuffmanCodes(VP8LDecoder* const dec, int xsize, int ysize,
VP8LMetadata* const hdr = &dec->hdr_;
uint32_t* huffman_image = NULL;
HTreeGroup* htree_groups = NULL;
// When reading htrees, some might be unused, as the format allows it.
// We will still read them but put them in this htree_group_bogus.
HTreeGroup htree_group_bogus;
HuffmanTables* huffman_tables = &hdr->huffman_tables_;
HuffmanCode* next = NULL;
int num_htree_groups = 1;
int num_htree_groups_max = 1;
int max_alphabet_size = 0;
@ -453,11 +449,21 @@ static int ReadHuffmanCodes(VP8LDecoder* const dec, int xsize, int ysize,
}
for (i = 0; i < num_htree_groups_max; ++i) {
// If the index "i" is unused in the Huffman image, read the coefficients
// but store them to a bogus htree_group.
const int is_bogus = (mapping != NULL && mapping[i] == -1);
// If the index "i" is unused in the Huffman image, just make sure the
// coefficients are valid but do not store them.
if (mapping != NULL && mapping[i] == -1) {
for (j = 0; j < HUFFMAN_CODES_PER_META_CODE; ++j) {
int alphabet_size = kAlphabetSize[j];
if (j == 0 && color_cache_bits > 0) {
alphabet_size += (1 << color_cache_bits);
}
// Passing in NULL so that nothing gets filled.
if (!ReadHuffmanCode(alphabet_size, dec, code_lengths, NULL)) {
goto Error;
}
}
} else {
HTreeGroup* const htree_group =
is_bogus ? &htree_group_bogus :
&htree_groups[(mapping == NULL) ? i : mapping[i]];
HuffmanCode** const htrees = htree_group->htrees;
int size;
@ -467,7 +473,7 @@ static int ReadHuffmanCodes(VP8LDecoder* const dec, int xsize, int ysize,
for (j = 0; j < HUFFMAN_CODES_PER_META_CODE; ++j) {
int alphabet_size = kAlphabetSize[j];
if (j == 0 && color_cache_bits > 0) {
alphabet_size += 1 << color_cache_bits;
alphabet_size += (1 << color_cache_bits);
}
size =
ReadHuffmanCode(alphabet_size, dec, code_lengths, huffman_tables);
@ -507,6 +513,7 @@ static int ReadHuffmanCodes(VP8LDecoder* const dec, int xsize, int ysize,
!htree_group->is_trivial_code && (max_bits < HUFFMAN_PACKED_BITS);
if (htree_group->use_packed_table) BuildPackedTable(htree_group);
}
}
ok = 1;
// All OK. Finalize pointers.

10
media/libwebp/src/utils/huffman_utils.c
View File

@ -91,7 +91,8 @@ static int BuildHuffmanTable(HuffmanCode* const root_table, int root_bits,
assert(code_lengths_size != 0);
assert(code_lengths != NULL);
assert(root_table != NULL);
assert((root_table != NULL && sorted != NULL) ||
(root_table == NULL && sorted == NULL));
assert(root_bits > 0);
// Build histogram of code lengths.
@ -120,16 +121,22 @@ static int BuildHuffmanTable(HuffmanCode* const root_table, int root_bits,
for (symbol = 0; symbol < code_lengths_size; ++symbol) {
const int symbol_code_length = code_lengths[symbol];
if (code_lengths[symbol] > 0) {
if (sorted != NULL) {
sorted[offset[symbol_code_length]++] = symbol;
} else {
offset[symbol_code_length]++;
}
}
}
// Special case code with only one value.
if (offset[MAX_ALLOWED_CODE_LENGTH] == 1) {
if (sorted != NULL) {
HuffmanCode code;
code.bits = 0;
code.value = (uint16_t)sorted[0];
ReplicateValue(table, 1, total_size, code);
}
return total_size;
}
@ -151,6 +158,7 @@ static int BuildHuffmanTable(HuffmanCode* const root_table, int root_bits,
if (num_open < 0) {
return 0;
}
if (root_table == NULL) continue;
for (; count[len] > 0; --count[len]) {
HuffmanCode code;
code.bits = (uint8_t)len;