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Side by Side Diff: third_party/brotli/enc/compress_fragment_two_pass.h

Issue 2537133002: Update brotli to v1.0.0-snapshot. (Closed)
Patch Set: Fixed typo Created 4 years ago
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1 /* Copyright 2015 Google Inc. All Rights Reserved. 1 /* Copyright 2015 Google Inc. All Rights Reserved.
2 2
3 Distributed under MIT license. 3 Distributed under MIT license.
4 See file LICENSE for detail or copy at https://opensource.org/licenses/MIT 4 See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
5 */ 5 */
6 6
7 // Function for fast encoding of an input fragment, independently from the input 7 /* Function for fast encoding of an input fragment, independently from the input
8 // history. This function uses two-pass processing: in the first pass we save 8 history. This function uses two-pass processing: in the first pass we save
9 // the found backward matches and literal bytes into a buffer, and in the 9 the found backward matches and literal bytes into a buffer, and in the
10 // second pass we emit them into the bit stream using prefix codes built based 10 second pass we emit them into the bit stream using prefix codes built based
11 // on the actual command and literal byte histograms. 11 on the actual command and literal byte histograms. */
12 12
13 #ifndef BROTLI_ENC_COMPRESS_FRAGMENT_TWO_PASS_H_ 13 #ifndef BROTLI_ENC_COMPRESS_FRAGMENT_TWO_PASS_H_
14 #define BROTLI_ENC_COMPRESS_FRAGMENT_TWO_PASS_H_ 14 #define BROTLI_ENC_COMPRESS_FRAGMENT_TWO_PASS_H_
15 15
16 #include "./types.h" 16 #include <brotli/types.h>
17 #include "./memory.h"
18 #include "./port.h"
17 19
18 namespace brotli { 20 #if defined(__cplusplus) || defined(c_plusplus)
21 extern "C" {
22 #endif
19 23
20 static const size_t kCompressFragmentTwoPassBlockSize = 1 << 17; 24 static const size_t kCompressFragmentTwoPassBlockSize = 1 << 17;
21 25
22 // Compresses "input" string to the "*storage" buffer as one or more complete 26 /* Compresses "input" string to the "*storage" buffer as one or more complete
23 // meta-blocks, and updates the "*storage_ix" bit position. 27 meta-blocks, and updates the "*storage_ix" bit position.
24 //
25 // If "is_last" is true, emits an additional empty last meta-block.
26 //
27 // REQUIRES: "input_size" is greater than zero, or "is_last" is true.
28 // REQUIRES: "command_buf" and "literal_buf" point to at least
29 // kCompressFragmentTwoPassBlockSize long arrays.
30 // REQUIRES: All elements in "table[0..table_size-1]" are initialized to zero.
31 // REQUIRES: "table_size" is a power of two
32 void BrotliCompressFragmentTwoPass(const uint8_t* input, size_t input_size,
33 bool is_last,
34 uint32_t* command_buf, uint8_t* literal_buf,
35 int* table, size_t table_size,
36 size_t* storage_ix, uint8_t* storage);
37 28
38 } // namespace brotli 29 If "is_last" is 1, emits an additional empty last meta-block.
39 30
40 #endif // BROTLI_ENC_COMPRESS_FRAGMENT_TWO_PASS_H_ 31 REQUIRES: "input_size" is greater than zero, or "is_last" is 1.
32 REQUIRES: "command_buf" and "literal_buf" point to at least
33 kCompressFragmentTwoPassBlockSize long arrays.
34 REQUIRES: All elements in "table[0..table_size-1]" are initialized to zero.
35 REQUIRES: "table_size" is a power of two
36 OUTPUT: maximal copy distance <= |input_size|
37 OUTPUT: maximal copy distance <= MaxBackwardLimit(18) */
38 BROTLI_INTERNAL void BrotliCompressFragmentTwoPass(MemoryManager* m,
39 const uint8_t* input,
40 size_t input_size,
41 BROTLI_BOOL is_last,
42 uint32_t* command_buf,
43 uint8_t* literal_buf,
44 int* table,
45 size_t table_size,
46 size_t* storage_ix,
47 uint8_t* storage);
48
49 #if defined(__cplusplus) || defined(c_plusplus)
50 } /* extern "C" */
51 #endif
52
53 #endif /* BROTLI_ENC_COMPRESS_FRAGMENT_TWO_PASS_H_ */
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