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Add the initial version of the static dictionary and transforms to Brotli.

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This commit is contained in:
Zoltan Szabadka
2014-02-17 14:25:36 +01:00
parent cbd5cb55f4
commit 2733d6c0c2
9 changed files with 12645 additions and 30 deletions
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brotli/dec/decode.c
+40 -5
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@@ -19,6 +19,8 @@
#include "./bit_reader.h"
#include "./context.h"
#include "./decode.h"
#include "./dictionary.h"
#include "./transform.h"
#include "./huffman.h"
#include "./prefix.h"
#include "./safe_malloc.h"
@@ -977,11 +979,44 @@ int BrotliDecompress(BrotliInput input, BrotliOutput output) {
copy_dst = &ringbuffer[pos & ringbuffer_mask];
if (distance > max_distance) {
printf("Invalid backward reference. pos: %d distance: %d "
"len: %d bytes left: %d\n", pos, distance, copy_length,
meta_block_remaining_len);
ok = 0;
goto End;
if (copy_length >= 3 && copy_length <= kMaxDictionaryWordLength) {
int offset = kBrotliDictionaryOffsetsByLength[copy_length];
int word_id = distance - max_distance - 1;
int shift = kBrotliDictionarySizeBitsByLength[copy_length];
int mask = (1 << shift) - 1;
int word_idx = word_id & mask;
int transform_idx = word_id >> shift;
offset += word_idx * copy_length;
if (transform_idx < kNumTransforms) {
const uint8_t* word = &kBrotliDictionary[offset];
int len = TransformDictionaryWord(
copy_dst, word, copy_length, transform_idx);
copy_dst += len;
pos += len;
meta_block_remaining_len -= len;
if (copy_dst >= ringbuffer_end) {
if (BrotliWrite(output, ringbuffer,
(size_t)ringbuffer_size) < 0) {
ok = 0;
goto End;
}
memcpy(ringbuffer, ringbuffer_end,
(size_t)(copy_dst - ringbuffer_end));
}
} else {
printf("Invalid backward reference. pos: %d distance: %d "
"len: %d bytes left: %d\n", pos, distance, copy_length,
meta_block_remaining_len);
ok = 0;
goto End;
}
} else {
printf("Invalid backward reference. pos: %d distance: %d "
"len: %d bytes left: %d\n", pos, distance, copy_length,
meta_block_remaining_len);
ok = 0;
goto End;
}
} else {
if (copy_length > meta_block_remaining_len) {
printf("Invalid backward reference. pos: %d distance: %d "