-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathencoder_base.c
192 lines (170 loc) · 7.35 KB
/
encoder_base.c
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
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
/* Lzlib - Compression library for the lzip format
Copyright (C) 2009-2024 Antonio Diaz Diaz.
This library is free software. Redistribution and use in source and
binary forms, with or without modification, are permitted provided
that the following conditions are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions, and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions, and the following disclaimer in the
documentation and/or other materials provided with the distribution.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/
static bool Mb_normalize_pos( struct Matchfinder_base * const mb )
{
if( mb->pos > mb->stream_pos )
{ mb->pos = mb->stream_pos; return false; }
if( !mb->at_stream_end )
{
int i;
/* offset is int32_t for the min below */
const int32_t offset = mb->pos - mb->before_size - mb->dictionary_size;
const int size = mb->stream_pos - offset;
memmove( mb->buffer, mb->buffer + offset, size );
mb->partial_data_pos += offset;
mb->pos -= offset; /* pos = before_size + dictionary_size */
mb->stream_pos -= offset;
for( i = 0; i < mb->num_prev_positions; ++i )
mb->prev_positions[i] -= min( mb->prev_positions[i], offset );
for( i = 0; i < mb->pos_array_size; ++i )
mb->pos_array[i] -= min( mb->pos_array[i], offset );
}
return true;
}
static bool Mb_init( struct Matchfinder_base * const mb, const int before_size,
const int dict_size, const int after_size,
const int dict_factor, const int num_prev_positions23,
const int pos_array_factor )
{
const int buffer_size_limit =
( dict_factor * dict_size ) + before_size + after_size;
int i;
mb->partial_data_pos = 0;
mb->before_size = before_size;
mb->after_size = after_size;
mb->pos = 0;
mb->cyclic_pos = 0;
mb->stream_pos = 0;
mb->num_prev_positions23 = num_prev_positions23;
mb->at_stream_end = false;
mb->sync_flush_pending = false;
mb->buffer_size = max( 65536, buffer_size_limit );
mb->buffer = (uint8_t *)malloc( mb->buffer_size );
if( !mb->buffer ) return false;
mb->saved_dictionary_size = dict_size;
mb->dictionary_size = dict_size;
mb->pos_limit = mb->buffer_size - after_size;
unsigned size = 1 << max( 16, real_bits( mb->dictionary_size - 1 ) - 2 );
if( mb->dictionary_size > 1 << 26 ) size >>= 1; /* 64 MiB */
mb->key4_mask = size - 1; /* increases with dictionary size */
size += num_prev_positions23;
mb->num_prev_positions = size;
mb->pos_array_size = pos_array_factor * ( mb->dictionary_size + 1 );
size += mb->pos_array_size;
if( size * sizeof mb->prev_positions[0] <= size ) mb->prev_positions = 0;
else mb->prev_positions =
(int32_t *)malloc( size * sizeof mb->prev_positions[0] );
if( !mb->prev_positions ) { free( mb->buffer ); return false; }
mb->pos_array = mb->prev_positions + mb->num_prev_positions;
for( i = 0; i < mb->num_prev_positions; ++i ) mb->prev_positions[i] = 0;
return true;
}
static void Mb_adjust_array( struct Matchfinder_base * const mb )
{
int size = 1 << max( 16, real_bits( mb->dictionary_size - 1 ) - 2 );
if( mb->dictionary_size > 1 << 26 ) size >>= 1; /* 64 MiB */
mb->key4_mask = size - 1;
size += mb->num_prev_positions23;
mb->num_prev_positions = size;
mb->pos_array = mb->prev_positions + mb->num_prev_positions;
}
static void Mb_adjust_dictionary_size( struct Matchfinder_base * const mb )
{
if( mb->stream_pos < mb->dictionary_size )
{
mb->dictionary_size = max( min_dictionary_size, mb->stream_pos );
Mb_adjust_array( mb );
mb->pos_limit = mb->buffer_size;
}
}
static void Mb_reset( struct Matchfinder_base * const mb )
{
int i;
if( mb->stream_pos > mb->pos )
memmove( mb->buffer, mb->buffer + mb->pos, mb->stream_pos - mb->pos );
mb->partial_data_pos = 0;
mb->stream_pos -= mb->pos;
mb->pos = 0;
mb->cyclic_pos = 0;
mb->at_stream_end = false;
mb->sync_flush_pending = false;
mb->dictionary_size = mb->saved_dictionary_size;
Mb_adjust_array( mb );
mb->pos_limit = mb->buffer_size - mb->after_size;
for( i = 0; i < mb->num_prev_positions; ++i ) mb->prev_positions[i] = 0;
}
/* End Of Stream marker => (dis == 0xFFFFFFFFU, len == min_match_len) */
static void LZeb_try_full_flush( struct LZ_encoder_base * const eb )
{
if( eb->member_finished || Cb_free_bytes( &eb->renc.cb ) <
max_marker_size + eb->renc.ff_count + Lt_size ) return;
eb->member_finished = true;
const int pos_state = Mb_data_position( &eb->mb ) & pos_state_mask;
const State state = eb->state;
Re_encode_bit( &eb->renc, &eb->bm_match[state][pos_state], 1 );
Re_encode_bit( &eb->renc, &eb->bm_rep[state], 0 );
LZeb_encode_pair( eb, 0xFFFFFFFFU, min_match_len, pos_state );
Re_flush( &eb->renc );
Lzip_trailer trailer;
Lt_set_data_crc( trailer, LZeb_crc( eb ) );
Lt_set_data_size( trailer, Mb_data_position( &eb->mb ) );
Lt_set_member_size( trailer, Re_member_position( &eb->renc ) + Lt_size );
int i; for( i = 0; i < Lt_size; ++i ) Cb_put_byte( &eb->renc.cb, trailer[i] );
}
/* Sync Flush marker => (dis == 0xFFFFFFFFU, len == min_match_len + 1) */
static void LZeb_try_sync_flush( struct LZ_encoder_base * const eb )
{
const unsigned min_size = eb->renc.ff_count + max_marker_size;
if( eb->member_finished ||
Cb_free_bytes( &eb->renc.cb ) < min_size + max_marker_size ) return;
eb->mb.sync_flush_pending = false;
const unsigned long long old_mpos = Re_member_position( &eb->renc );
const int pos_state = Mb_data_position( &eb->mb ) & pos_state_mask;
const State state = eb->state;
do { /* size of markers must be >= rd_min_available_bytes + 5 */
Re_encode_bit( &eb->renc, &eb->bm_match[state][pos_state], 1 );
Re_encode_bit( &eb->renc, &eb->bm_rep[state], 0 );
LZeb_encode_pair( eb, 0xFFFFFFFFU, min_match_len + 1, pos_state );
Re_flush( &eb->renc );
}
while( Re_member_position( &eb->renc ) - old_mpos < min_size );
}
static void LZeb_reset( struct LZ_encoder_base * const eb,
const unsigned long long member_size )
{
const unsigned long long min_member_size = min_dictionary_size;
const unsigned long long max_member_size = 0x0008000000000000ULL; /* 2 PiB */
int i;
Mb_reset( &eb->mb );
eb->member_size_limit = min( max( min_member_size, member_size ),
max_member_size ) - Lt_size - max_marker_size;
eb->crc = 0xFFFFFFFFU;
Bm_array_init( eb->bm_literal[0], (1 << literal_context_bits) * 0x300 );
Bm_array_init( eb->bm_match[0], states * pos_states );
Bm_array_init( eb->bm_rep, states );
Bm_array_init( eb->bm_rep0, states );
Bm_array_init( eb->bm_rep1, states );
Bm_array_init( eb->bm_rep2, states );
Bm_array_init( eb->bm_len[0], states * pos_states );
Bm_array_init( eb->bm_dis_slot[0], len_states * (1 << dis_slot_bits) );
Bm_array_init( eb->bm_dis, modeled_distances - end_dis_model + 1 );
Bm_array_init( eb->bm_align, dis_align_size );
Lm_init( &eb->match_len_model );
Lm_init( &eb->rep_len_model );
Re_reset( &eb->renc, eb->mb.dictionary_size );
for( i = 0; i < num_rep_distances; ++i ) eb->reps[i] = 0;
eb->state = 0;
eb->member_finished = false;
}