Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/brotli/c/enc/compress_fragment.h @ 46:7ee69f120f19 default tip

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* Copyright 2015 Google Inc. All Rights Reserved.
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3 Distributed under MIT license.
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4 See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
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5 */
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7 /* Function for fast encoding of an input fragment, independently from the input
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8 history. This function uses one-pass processing: when we find a backward
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9 match, we immediately emit the corresponding command and literal codes to
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10 the bit stream. */
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12 #ifndef BROTLI_ENC_COMPRESS_FRAGMENT_H_
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13 #define BROTLI_ENC_COMPRESS_FRAGMENT_H_
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15 #include <brotli/types.h>
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17 #include "../common/constants.h"
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18 #include "../common/platform.h"
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19 #include "entropy_encode.h"
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21 #if defined(__cplusplus) || defined(c_plusplus)
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22 extern "C" {
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23 #endif
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25 typedef struct BrotliOnePassArena {
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26 uint8_t lit_depth[256];
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27 uint16_t lit_bits[256];
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29 /* Command and distance prefix codes (each 64 symbols, stored back-to-back)
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30 used for the next block. The command prefix code is over a smaller alphabet
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31 with the following 64 symbols:
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32 0 - 15: insert length code 0, copy length code 0 - 15, same distance
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33 16 - 39: insert length code 0, copy length code 0 - 23
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34 40 - 63: insert length code 0 - 23, copy length code 0
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35 Note that symbols 16 and 40 represent the same code in the full alphabet,
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36 but we do not use either of them. */
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37 uint8_t cmd_depth[128];
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38 uint16_t cmd_bits[128];
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39 uint32_t cmd_histo[128];
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41 /* The compressed form of the command and distance prefix codes for the next
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42 block. */
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43 uint8_t cmd_code[512];
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44 size_t cmd_code_numbits;
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46 HuffmanTree tree[2 * BROTLI_NUM_LITERAL_SYMBOLS + 1];
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47 uint32_t histogram[256];
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48 uint8_t tmp_depth[BROTLI_NUM_COMMAND_SYMBOLS];
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49 uint16_t tmp_bits[64];
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50 } BrotliOnePassArena;
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52 /* Compresses "input" string to the "*storage" buffer as one or more complete
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53 meta-blocks, and updates the "*storage_ix" bit position.
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55 If "is_last" is 1, emits an additional empty last meta-block.
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57 "cmd_depth" and "cmd_bits" contain the command and distance prefix codes
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58 (see comment in encode.h) used for the encoding of this input fragment.
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59 If "is_last" is 0, they are updated to reflect the statistics
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60 of this input fragment, to be used for the encoding of the next fragment.
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62 "*cmd_code_numbits" is the number of bits of the compressed representation
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63 of the command and distance prefix codes, and "cmd_code" is an array of
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64 at least "(*cmd_code_numbits + 7) >> 3" size that contains the compressed
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65 command and distance prefix codes. If "is_last" is 0, these are also
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66 updated to represent the updated "cmd_depth" and "cmd_bits".
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68 REQUIRES: "input_size" is greater than zero, or "is_last" is 1.
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69 REQUIRES: "input_size" is less or equal to maximal metablock size (1 << 24).
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70 REQUIRES: All elements in "table[0..table_size-1]" are initialized to zero.
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71 REQUIRES: "table_size" is an odd (9, 11, 13, 15) power of two
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72 OUTPUT: maximal copy distance <= |input_size|
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73 OUTPUT: maximal copy distance <= BROTLI_MAX_BACKWARD_LIMIT(18) */
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74 BROTLI_INTERNAL void BrotliCompressFragmentFast(BrotliOnePassArena* s,
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75 const uint8_t* input,
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76 size_t input_size,
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77 BROTLI_BOOL is_last,
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78 int* table, size_t table_size,
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79 size_t* storage_ix,
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80 uint8_t* storage);
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82 #if defined(__cplusplus) || defined(c_plusplus)
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83 } /* extern "C" */
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84 #endif
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86 #endif /* BROTLI_ENC_COMPRESS_FRAGMENT_H_ */