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fix wording

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PiperOrigin-RevId: 576788685
This commit is contained in:
Evgenii Kliuchnikov 2023-10-26 02:02:51 -07:00 committed by Copybara-Service
parent 53947c15f5
commit 9b83be233e
3 changed files with 12 additions and 12 deletions
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18
c/enc/encode.c
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@ -271,18 +271,18 @@ static void ChooseContextMap(int quality,
uint32_t two_prefix_histo[6] = { 0 }; uint32_t two_prefix_histo[6] = { 0 };
size_t total; size_t total;
size_t i; size_t i;
size_t dummy; size_t sink;
double entropy[4]; double entropy[4];
for (i = 0; i < 9; ++i) { for (i = 0; i < 9; ++i) {
monogram_histo[i % 3] += bigram_histo[i]; monogram_histo[i % 3] += bigram_histo[i];
two_prefix_histo[i % 6] += bigram_histo[i]; two_prefix_histo[i % 6] += bigram_histo[i];
} }
entropy[1] = ShannonEntropy(monogram_histo, 3, &dummy); entropy[1] = ShannonEntropy(monogram_histo, 3, &sink);
entropy[2] = (ShannonEntropy(two_prefix_histo, 3, &dummy) + entropy[2] = (ShannonEntropy(two_prefix_histo, 3, &sink) +
ShannonEntropy(two_prefix_histo + 3, 3, &dummy)); ShannonEntropy(two_prefix_histo + 3, 3, &sink));
entropy[3] = 0; entropy[3] = 0;
for (i = 0; i < 3; ++i) { for (i = 0; i < 3; ++i) {
entropy[3] += ShannonEntropy(bigram_histo + 3 * i, 3, &dummy); entropy[3] += ShannonEntropy(bigram_histo + 3 * i, 3, &sink);
} }
total = monogram_histo[0] + monogram_histo[1] + monogram_histo[2]; total = monogram_histo[0] + monogram_histo[1] + monogram_histo[2];
@ -348,7 +348,7 @@ static BROTLI_BOOL ShouldUseComplexStaticContextMap(const uint8_t* input,
uint32_t* BROTLI_RESTRICT const context_histo = arena + 32; uint32_t* BROTLI_RESTRICT const context_histo = arena + 32;
uint32_t total = 0; uint32_t total = 0;
double entropy[3]; double entropy[3];
size_t dummy; size_t sink;
size_t i; size_t i;
ContextLut utf8_lut = BROTLI_CONTEXT_LUT(CONTEXT_UTF8); ContextLut utf8_lut = BROTLI_CONTEXT_LUT(CONTEXT_UTF8);
memset(arena, 0, sizeof(arena[0]) * 32 * 14); memset(arena, 0, sizeof(arena[0]) * 32 * 14);
@ -370,10 +370,10 @@ static BROTLI_BOOL ShouldUseComplexStaticContextMap(const uint8_t* input,
prev1 = literal; prev1 = literal;
} }
} }
entropy[1] = ShannonEntropy(combined_histo, 32, &dummy); entropy[1] = ShannonEntropy(combined_histo, 32, &sink);
entropy[2] = 0; entropy[2] = 0;
for (i = 0; i < 13; ++i) { for (i = 0; i < 13; ++i) {
entropy[2] += ShannonEntropy(context_histo + (i << 5), 32, &dummy); entropy[2] += ShannonEntropy(context_histo + (i << 5), 32, &sink);
} }
entropy[0] = 1.0 / (double)total; entropy[0] = 1.0 / (double)total;
entropy[1] *= entropy[0]; entropy[1] *= entropy[0];
@ -817,7 +817,7 @@ static void CopyInputToRingBuffer(BrotliEncoderState* s,
reading new bytes from the input. However, at the last few indexes of reading new bytes from the input. However, at the last few indexes of
the ring buffer, there are not enough bytes to build full-length the ring buffer, there are not enough bytes to build full-length
substrings from. Since the hash table always contains full-length substrings from. Since the hash table always contains full-length
substrings, we erase with dummy zeros here to make sure that those substrings, we overwrite with zeros here to make sure that those
substrings will contain zeros at the end instead of uninitialized substrings will contain zeros at the end instead of uninitialized
data. data.

4
c/enc/encoder_dict.c
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@ -118,8 +118,8 @@ static uint32_t BrotliTrieAlloc(MemoryManager* m, size_t num, BrotliTrie* trie,
keep_index = (uint32_t)(*keep - trie->pool); keep_index = (uint32_t)(*keep - trie->pool);
} }
if (trie->pool_size == 0) { if (trie->pool_size == 0) {
/* Have a dummy node in the front. We do not want the result to be 0, it /* Have a placeholder node in the front. We do not want the result to be 0,
must be at least 1, 0 represents "null pointer" */ it must be at least 1, 0 represents "null pointer" */
trie->pool_size = 1; trie->pool_size = 1;
} }
BROTLI_ENSURE_CAPACITY(m, BrotliTrieNode, trie->pool, trie->pool_capacity, BROTLI_ENSURE_CAPACITY(m, BrotliTrieNode, trie->pool, trie->pool_capacity,

2
research/brotlidump.py
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@ -2240,7 +2240,7 @@ __test__ = {
'file': """ 'file': """
>>> try: Layout(BitStream( >>> try: Layout(BitStream(
... open("H:/Downloads/brotli-master/tests/testdata/10x10y.compressed",'rb') ... open("./tests/testdata/10x10y.compressed",'rb')
... .read())).processStream() ... .read())).processStream()
... except NotImplementedError: pass ... except NotImplementedError: pass
addr hex binary context explanation addr hex binary context explanation