1/* Copyright 2015 Google Inc. All Rights Reserved.
2
3 Distributed under MIT license.
4 See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
5*/
6
7/* Function for fast encoding of an input fragment, independently from the input
8 history. This function uses one-pass processing: when we find a backward
9 match, we immediately emit the corresponding command and literal codes to
10 the bit stream. */
11
12#ifndef BROTLI_ENC_COMPRESS_FRAGMENT_H_
13#define BROTLI_ENC_COMPRESS_FRAGMENT_H_
14
15#include "../common/platform.h"
16#include <brotli/types.h>
17#include "./memory.h"
18
19#if defined(__cplusplus) || defined(c_plusplus)
20extern "C" {
21#endif
22
23/* Compresses "input" string to the "*storage" buffer as one or more complete
24 meta-blocks, and updates the "*storage_ix" bit position.
25
26 If "is_last" is 1, emits an additional empty last meta-block.
27
28 "cmd_depth" and "cmd_bits" contain the command and distance prefix codes
29 (see comment in encode.h) used for the encoding of this input fragment.
30 If "is_last" is 0, they are updated to reflect the statistics
31 of this input fragment, to be used for the encoding of the next fragment.
32
33 "*cmd_code_numbits" is the number of bits of the compressed representation
34 of the command and distance prefix codes, and "cmd_code" is an array of
35 at least "(*cmd_code_numbits + 7) >> 3" size that contains the compressed
36 command and distance prefix codes. If "is_last" is 0, these are also
37 updated to represent the updated "cmd_depth" and "cmd_bits".
38
39 REQUIRES: "input_size" is greater than zero, or "is_last" is 1.
40 REQUIRES: "input_size" is less or equal to maximal metablock size (1 << 24).
41 REQUIRES: All elements in "table[0..table_size-1]" are initialized to zero.
42 REQUIRES: "table_size" is an odd (9, 11, 13, 15) power of two
43 OUTPUT: maximal copy distance <= |input_size|
44 OUTPUT: maximal copy distance <= BROTLI_MAX_BACKWARD_LIMIT(18) */
45BROTLI_INTERNAL void BrotliCompressFragmentFast(MemoryManager* m,
46 const uint8_t* input,
47 size_t input_size,
48 BROTLI_BOOL is_last,
49 int* table, size_t table_size,
50 uint8_t cmd_depth[128],
51 uint16_t cmd_bits[128],
52 size_t* cmd_code_numbits,
53 uint8_t* cmd_code,
54 size_t* storage_ix,
55 uint8_t* storage);
56
57#if defined(__cplusplus) || defined(c_plusplus)
58} /* extern "C" */
59#endif
60
61#endif /* BROTLI_ENC_COMPRESS_FRAGMENT_H_ */
62