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Diffstat (limited to 'deps/node/deps/brotli/c/enc/entropy_encode.h')
-rw-r--r-- | deps/node/deps/brotli/c/enc/entropy_encode.h | 122 |
1 files changed, 0 insertions, 122 deletions
diff --git a/deps/node/deps/brotli/c/enc/entropy_encode.h b/deps/node/deps/brotli/c/enc/entropy_encode.h deleted file mode 100644 index f23d9c37..00000000 --- a/deps/node/deps/brotli/c/enc/entropy_encode.h +++ /dev/null @@ -1,122 +0,0 @@ -/* Copyright 2010 Google Inc. All Rights Reserved. - - Distributed under MIT license. - See file LICENSE for detail or copy at https://opensource.org/licenses/MIT -*/ - -/* Entropy encoding (Huffman) utilities. */ - -#ifndef BROTLI_ENC_ENTROPY_ENCODE_H_ -#define BROTLI_ENC_ENTROPY_ENCODE_H_ - -#include "../common/platform.h" -#include <brotli/types.h> - -#if defined(__cplusplus) || defined(c_plusplus) -extern "C" { -#endif - -/* A node of a Huffman tree. */ -typedef struct HuffmanTree { - uint32_t total_count_; - int16_t index_left_; - int16_t index_right_or_value_; -} HuffmanTree; - -static BROTLI_INLINE void InitHuffmanTree(HuffmanTree* self, uint32_t count, - int16_t left, int16_t right) { - self->total_count_ = count; - self->index_left_ = left; - self->index_right_or_value_ = right; -} - -/* Returns 1 is assignment of depths succeeded, otherwise 0. */ -BROTLI_INTERNAL BROTLI_BOOL BrotliSetDepth( - int p, HuffmanTree* pool, uint8_t* depth, int max_depth); - -/* This function will create a Huffman tree. - - The (data,length) contains the population counts. - The tree_limit is the maximum bit depth of the Huffman codes. - - The depth contains the tree, i.e., how many bits are used for - the symbol. - - The actual Huffman tree is constructed in the tree[] array, which has to - be at least 2 * length + 1 long. - - See http://en.wikipedia.org/wiki/Huffman_coding */ -BROTLI_INTERNAL void BrotliCreateHuffmanTree(const uint32_t* data, - const size_t length, - const int tree_limit, - HuffmanTree* tree, - uint8_t* depth); - -/* Change the population counts in a way that the consequent - Huffman tree compression, especially its RLE-part will be more - likely to compress this data more efficiently. - - length contains the size of the histogram. - counts contains the population counts. - good_for_rle is a buffer of at least length size */ -BROTLI_INTERNAL void BrotliOptimizeHuffmanCountsForRle( - size_t length, uint32_t* counts, uint8_t* good_for_rle); - -/* Write a Huffman tree from bit depths into the bit-stream representation - of a Huffman tree. The generated Huffman tree is to be compressed once - more using a Huffman tree */ -BROTLI_INTERNAL void BrotliWriteHuffmanTree(const uint8_t* depth, - size_t num, - size_t* tree_size, - uint8_t* tree, - uint8_t* extra_bits_data); - -/* Get the actual bit values for a tree of bit depths. */ -BROTLI_INTERNAL void BrotliConvertBitDepthsToSymbols(const uint8_t* depth, - size_t len, - uint16_t* bits); - -/* Input size optimized Shell sort. */ -typedef BROTLI_BOOL (*HuffmanTreeComparator)( - const HuffmanTree*, const HuffmanTree*); -static BROTLI_INLINE void SortHuffmanTreeItems(HuffmanTree* items, - const size_t n, HuffmanTreeComparator comparator) { - static const size_t gaps[] = {132, 57, 23, 10, 4, 1}; - if (n < 13) { - /* Insertion sort. */ - size_t i; - for (i = 1; i < n; ++i) { - HuffmanTree tmp = items[i]; - size_t k = i; - size_t j = i - 1; - while (comparator(&tmp, &items[j])) { - items[k] = items[j]; - k = j; - if (!j--) break; - } - items[k] = tmp; - } - return; - } else { - /* Shell sort. */ - int g = n < 57 ? 2 : 0; - for (; g < 6; ++g) { - size_t gap = gaps[g]; - size_t i; - for (i = gap; i < n; ++i) { - size_t j = i; - HuffmanTree tmp = items[i]; - for (; j >= gap && comparator(&tmp, &items[j - gap]); j -= gap) { - items[j] = items[j - gap]; - } - items[j] = tmp; - } - } - } -} - -#if defined(__cplusplus) || defined(c_plusplus) -} /* extern "C" */ -#endif - -#endif /* BROTLI_ENC_ENTROPY_ENCODE_H_ */ |