1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/* Copyright 2013 Google Inc. All Rights Reserved.
Distributed under MIT license.
See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
*/
/* Function to find backward reference copies. */
#ifndef BROTLI_ENC_BACKWARD_REFERENCES_HQ_H_
#define BROTLI_ENC_BACKWARD_REFERENCES_HQ_H_
#include "../common/constants.h"
#include "../common/dictionary.h"
#include "../common/platform.h"
#include <brotli/types.h>
#include "./command.h"
#include "./hash.h"
#include "./memory.h"
#include "./quality.h"
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
BROTLI_INTERNAL void BrotliCreateZopfliBackwardReferences(MemoryManager* m,
size_t num_bytes, size_t position, const uint8_t* ringbuffer,
size_t ringbuffer_mask, const BrotliEncoderParams* params,
HasherHandle hasher, int* dist_cache, size_t* last_insert_len,
Command* commands, size_t* num_commands, size_t* num_literals);
BROTLI_INTERNAL void BrotliCreateHqZopfliBackwardReferences(MemoryManager* m,
size_t num_bytes, size_t position, const uint8_t* ringbuffer,
size_t ringbuffer_mask, const BrotliEncoderParams* params,
HasherHandle hasher, int* dist_cache, size_t* last_insert_len,
Command* commands, size_t* num_commands, size_t* num_literals);
typedef struct ZopfliNode {
/* Best length to get up to this byte (not including this byte itself)
highest 7 bit is used to reconstruct the length code. */
uint32_t length;
/* Distance associated with the length. */
uint32_t distance;
/* Number of literal inserts before this copy; highest 5 bits contain
distance short code + 1 (or zero if no short code). */
uint32_t dcode_insert_length;
/* This union holds information used by dynamic-programming. During forward
pass |cost| it used to store the goal function. When node is processed its
|cost| is invalidated in favor of |shortcut|. On path back-tracing pass
|next| is assigned the offset to next node on the path. */
union {
/* Smallest cost to get to this byte from the beginning, as found so far. */
float cost;
/* Offset to the next node on the path. Equals to command_length() of the
next node on the path. For last node equals to BROTLI_UINT32_MAX */
uint32_t next;
/* Node position that provides next distance for distance cache. */
uint32_t shortcut;
} u;
} ZopfliNode;
BROTLI_INTERNAL void BrotliInitZopfliNodes(ZopfliNode* array, size_t length);
/* Computes the shortest path of commands from position to at most
position + num_bytes.
On return, path->size() is the number of commands found and path[i] is the
length of the i-th command (copy length plus insert length).
Note that the sum of the lengths of all commands can be less than num_bytes.
On return, the nodes[0..num_bytes] array will have the following
"ZopfliNode array invariant":
For each i in [1..num_bytes], if nodes[i].cost < kInfinity, then
(1) nodes[i].copy_length() >= 2
(2) nodes[i].command_length() <= i and
(3) nodes[i - nodes[i].command_length()].cost < kInfinity */
BROTLI_INTERNAL size_t BrotliZopfliComputeShortestPath(
MemoryManager* m, size_t num_bytes,
size_t position, const uint8_t* ringbuffer, size_t ringbuffer_mask,
const BrotliEncoderParams* params,
const int* dist_cache, HasherHandle hasher, ZopfliNode* nodes);
BROTLI_INTERNAL void BrotliZopfliCreateCommands(
const size_t num_bytes, const size_t block_start, const ZopfliNode* nodes,
int* dist_cache, size_t* last_insert_len, const BrotliEncoderParams* params,
Command* commands, size_t* num_literals);
#if defined(__cplusplus) || defined(c_plusplus)
} /* extern "C" */
#endif
#endif /* BROTLI_ENC_BACKWARD_REFERENCES_HQ_H_ */
|
