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annotate mupdf-source/thirdparty/brotli/c/enc/compress_fragment_two_pass.h @ 36:14b91574d44a v1.26.4+2

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+++++ v1.26.4+2
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 22 Sep 2025 11:43:48 +0200
parents b50eed0cc0ef
children
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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 two-pass processing: in the first pass we save
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9 the found backward matches and literal bytes into a buffer, and in the
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10 second pass we emit them into the bit stream using prefix codes built based
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11 on the actual command and literal byte histograms. */
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13 #ifndef BROTLI_ENC_COMPRESS_FRAGMENT_TWO_PASS_H_
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14 #define BROTLI_ENC_COMPRESS_FRAGMENT_TWO_PASS_H_
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16 #include <brotli/types.h>
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18 #include "../common/constants.h"
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19 #include "../common/platform.h"
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20 #include "entropy_encode.h"
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22 #if defined(__cplusplus) || defined(c_plusplus)
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23 extern "C" {
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24 #endif
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26 /* TODO(eustas): turn to macro. */
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27 static const size_t kCompressFragmentTwoPassBlockSize = 1 << 17;
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29 typedef struct BrotliTwoPassArena {
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30 uint32_t lit_histo[256];
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31 uint8_t lit_depth[256];
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32 uint16_t lit_bits[256];
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34 uint32_t cmd_histo[128];
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35 uint8_t cmd_depth[128];
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36 uint16_t cmd_bits[128];
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38 /* BuildAndStoreCommandPrefixCode */
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39 HuffmanTree tmp_tree[2 * BROTLI_NUM_LITERAL_SYMBOLS + 1];
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40 uint8_t tmp_depth[BROTLI_NUM_COMMAND_SYMBOLS];
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41 uint16_t tmp_bits[64];
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42 } BrotliTwoPassArena;
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44 /* Compresses "input" string to the "*storage" buffer as one or more complete
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45 meta-blocks, and updates the "*storage_ix" bit position.
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47 If "is_last" is 1, emits an additional empty last meta-block.
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49 REQUIRES: "input_size" is greater than zero, or "is_last" is 1.
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50 REQUIRES: "input_size" is less or equal to maximal metablock size (1 << 24).
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51 REQUIRES: "command_buf" and "literal_buf" point to at least
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52 kCompressFragmentTwoPassBlockSize long arrays.
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53 REQUIRES: All elements in "table[0..table_size-1]" are initialized to zero.
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54 REQUIRES: "table_size" is a power of two
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55 OUTPUT: maximal copy distance <= |input_size|
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56 OUTPUT: maximal copy distance <= BROTLI_MAX_BACKWARD_LIMIT(18) */
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57 BROTLI_INTERNAL void BrotliCompressFragmentTwoPass(BrotliTwoPassArena* s,
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58 const uint8_t* input,
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59 size_t input_size,
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60 BROTLI_BOOL is_last,
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61 uint32_t* command_buf,
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62 uint8_t* literal_buf,
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63 int* table,
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64 size_t table_size,
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65 size_t* storage_ix,
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66 uint8_t* storage);
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68 #if defined(__cplusplus) || defined(c_plusplus)
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69 } /* extern "C" */
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70 #endif
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72 #endif /* BROTLI_ENC_COMPRESS_FRAGMENT_TWO_PASS_H_ */