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
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
|
/* lzo1b_de.h -- definitions for the the LZO1B/LZO1C algorithm
This file is part of the LZO real-time data compression library.
Copyright (C) 1996-2014 Markus Franz Xaver Johannes Oberhumer
All Rights Reserved.
The LZO library is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
The LZO 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. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with the LZO library; see the file COPYING.
If not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
Markus F.X.J. Oberhumer
<markus@oberhumer.com>
http://www.oberhumer.com/opensource/lzo/
*/
/* WARNING: this file should *not* be used by applications. It is
part of the implementation of the library and is subject
to change.
*/
#ifndef __LZO_DEFS_H
#define __LZO_DEFS_H 1
#ifdef __cplusplus
extern "C" {
#endif
/***********************************************************************
//
************************************************************************/
/*
Format of the marker byte
76543210
--------
00000000 R0 - a long literal run ('R0' run)
000rrrrr R - a short literal run with len r
00100000 M4 - a very long match
001mmmmm M3 - a long match (len = m+M3_MIN_LEN)
mmmooooo M2 - a short match (len = m+M2_MIN_LEN, o = offset low bits)
M1 is not used !
*/
#ifndef R_BITS
#define R_BITS (5)
#endif
#ifndef M1L_BITS
#define M1L_BITS (0)
#endif
#ifndef M2L_BITS
#define M2L_BITS (CHAR_BIT - M2O_BITS)
#endif
#ifndef M3L_BITS
#define M3L_BITS (R_BITS)
#endif
#ifndef M4L_BITS
#define M4L_BITS (CHAR_BIT)
#endif
#ifndef M1O_BITS
#define M1O_BITS (6)
#endif
#ifndef M2O_BITS
#define M2O_BITS (R_BITS)
#endif
#ifndef M3O_BITS
#define M3O_BITS (CHAR_BIT)
#endif
#ifndef M4O_BITS
#define M4O_BITS (M3O_BITS) /* must be the same */
#endif
#ifndef M1X_BITS
#define M1X_BITS (M1O_BITS)
#endif
#ifndef M2X_BITS
#define M2X_BITS (M2O_BITS + CHAR_BIT)
#endif
#ifndef M3X_BITS
#define M3X_BITS (M3O_BITS + CHAR_BIT)
#endif
#ifndef M4X_BITS
#define M4X_BITS M3X_BITS
#endif
#define __MIN_OFFSET(bits) 1
#define __MAX_OFFSET(bits) LZO_SIZE(bits)
#define M1_MIN_OFFSET __MIN_OFFSET(M1X_BITS)
#define M2_MIN_OFFSET __MIN_OFFSET(M2X_BITS)
#define M3_MIN_OFFSET __MIN_OFFSET(M3X_BITS)
#define M4_MIN_OFFSET M3_MIN_OFFSET
#if defined(LZO_EOF_CODE) && !defined(M3_EOF_OFFSET)
#define M3_EOF_OFFSET 1
#else
#define M3_EOF_OFFSET 0
#endif
#ifndef _M1_MAX_OFFSET
#define _M1_MAX_OFFSET __MAX_OFFSET(M1X_BITS)
#endif
#ifndef _M2_MAX_OFFSET
#define _M2_MAX_OFFSET __MAX_OFFSET(M2X_BITS)
#endif
#ifndef _M3_MAX_OFFSET
#define _M3_MAX_OFFSET (__MAX_OFFSET(M3X_BITS) - M3_EOF_OFFSET)
#endif
#ifndef _M4_MAX_OFFSET
#define _M4_MAX_OFFSET _M3_MAX_OFFSET
#endif
#ifndef _MAX_OFFSET
#define _MAX_OFFSET _M4_MAX_OFFSET
#endif
#if (M3_EOF_OFFSET > 0) && (_M2_MAX_OFFSET == _M3_MAX_OFFSET + M3_EOF_OFFSET)
# undef _M2_MAX_OFFSET
# define _M2_MAX_OFFSET _M3_MAX_OFFSET
#endif
#if (_M2_MAX_OFFSET > _M3_MAX_OFFSET)
# error
#endif
#define M1_MAX_OFFSET ((lzo_uint) _M1_MAX_OFFSET)
#define M2_MAX_OFFSET ((lzo_uint) _M2_MAX_OFFSET)
#define M3_MAX_OFFSET ((lzo_uint) _M3_MAX_OFFSET)
#define M4_MAX_OFFSET ((lzo_uint) _M4_MAX_OFFSET)
#define MAX_OFFSET ((lzo_uint) _MAX_OFFSET)
#ifndef M1_MIN_LEN
#define M1_MIN_LEN (2)
#endif
#ifndef M2_MIN_LEN
#define M2_MIN_LEN (3)
#endif
#ifndef M3_MIN_LEN
#if (M3X_BITS == M2X_BITS)
#define M3_MIN_LEN (M2_MAX_LEN + 1)
#else
#define M3_MIN_LEN (4)
#endif
#endif
#ifndef M4_MIN_LEN
#define M4_MIN_LEN (M3_MAX_LEN + 1)
#endif
#ifndef M1_MAX_LEN
#define M1_MAX_LEN (M1_MIN_LEN + LZO_SIZE(M1L_BITS) - 1)
#endif
#ifndef M2_MAX_LEN
#define M2_MAX_LEN (M2_MIN_LEN + LZO_SIZE(M2L_BITS) - 3)
#endif
#ifndef M3_MAX_LEN
#define M3_MAX_LEN (M3_MIN_LEN + LZO_SIZE(M3L_BITS) - 2)
#endif
#ifndef M4_MAX_LEN
#define M4_MAX_LEN (ULONG_MAX)
#endif
#define M1O_MASK LZO_MASK(M1O_BITS)
#define M1L_MASK LZO_MASK(M1L_BITS)
#define M2O_MASK LZO_MASK(M2O_BITS)
#define M2L_MASK LZO_MASK(M2L_BITS)
#define M3O_MASK LZO_MASK(M3O_BITS)
#define M3L_MASK LZO_MASK(M3L_BITS)
#define M4O_MASK LZO_MASK(M4O_BITS)
#define M4L_MASK LZO_MASK(M4L_BITS)
#define M1_MARKER (1 << M1O_BITS)
#define M2_MARKER (2 << M2O_BITS)
#define M3_MARKER (1 << M3L_BITS)
#define M4_MARKER M3_MARKER
/***********************************************************************
// R0 literal run (a long run)
************************************************************************/
#ifndef R0MIN
#define R0MIN (LZO_SIZE(R_BITS)) /* Minimum len of R0 run of literals */
#endif
#define R0MAX (R0MIN + 256 - 1) /* Maximum len of R0 run of literals */
#if (R0MAX - (R0MAX & ~7u) >= 7)
#define R0FAST (R0MAX & ~7u) /* R0MAX aligned to 8 byte boundary */
#else
#define R0FAST (R0MAX & ~15u) /* R0MAX aligned to 8 byte boundary */
#endif
#if (R0MAX - R0FAST < 7) || ((R0FAST & 7) != 0)
# error "something went wrong"
#endif
#if (R0FAST * 2 < 512)
# error "R0FAST is not big enough"
#endif
/* 7 special codes from R0FAST+1 .. R0MAX
* these codes mean long R0 runs with lengths
* 512, 1024, 2048, 4096, 8192, 16384, 32768
*/
/***********************************************************************
// matching
************************************************************************/
#define PS *m_pos++ != *ip++
/* We already matched M2_MIN_LEN bytes.
* Try to match another M2_MAX_LEN - M2_MIN_LEN bytes. */
#if (M2_MAX_LEN - M2_MIN_LEN == 4)
# define MATCH_M2X (PS || PS || PS || PS)
#elif (M2_MAX_LEN - M2_MIN_LEN == 5)
# define MATCH_M2X (PS || PS || PS || PS || PS)
#elif (M2_MAX_LEN - M2_MIN_LEN == 6)
# define MATCH_M2X (PS || PS || PS || PS || PS || PS)
#elif (M2_MAX_LEN - M2_MIN_LEN == 7)
# define MATCH_M2X (PS || PS || PS || PS || PS || PS || PS)
#elif (M2_MAX_LEN - M2_MIN_LEN == 13)
# define MATCH_M2X (PS || PS || PS || PS || PS || PS || PS || PS || \
PS || PS || PS || PS || PS)
#elif (M2_MAX_LEN - M2_MIN_LEN == 14)
# define MATCH_M2X (PS || PS || PS || PS || PS || PS || PS || PS || \
PS || PS || PS || PS || PS || PS)
#elif (M2_MAX_LEN - M2_MIN_LEN == 16)
# define MATCH_M2X (PS || PS || PS || PS || PS || PS || PS || PS || \
PS || PS || PS || PS || PS || PS || PS || PS)
#elif (M2_MAX_LEN - M2_MIN_LEN == 29)
# define MATCH_M2X (PS || PS || PS || PS || PS || PS || PS || PS || \
PS || PS || PS || PS || PS || PS || PS || PS || \
PS || PS || PS || PS || PS || PS || PS || PS || \
PS || PS || PS || PS || PS)
#else
# error "MATCH_M2X not yet implemented"
#endif
/* We already matched M2_MIN_LEN bytes.
* Try to match another M2_MAX_LEN + 1 - M2_MIN_LEN bytes
* to see if we get more than a M2 match */
#define MATCH_M2 (MATCH_M2X || PS)
/***********************************************************************
// copying
************************************************************************/
#define _CP *op++ = *m_pos++
#if (M2_MIN_LEN == 2)
# define COPY_M2X _CP
#elif (M2_MIN_LEN == 3)
# define COPY_M2X _CP; _CP
#elif (M2_MIN_LEN == 4)
# define COPY_M2X _CP; _CP; _CP
#else
# error "COPY_M2X not yet implemented"
#endif
#if (M3_MIN_LEN == 3)
# define COPY_M3X _CP; _CP
#elif (M3_MIN_LEN == 4)
# define COPY_M3X _CP; _CP; _CP
#elif (M3_MIN_LEN == 9)
# define COPY_M3X _CP; _CP; _CP; _CP; _CP; _CP; _CP; _CP
#else
# error "COPY_M3X not yet implemented"
#endif
#define COPY_M2 COPY_M2X; *op++ = *m_pos++
#define COPY_M3 COPY_M3X; *op++ = *m_pos++
/***********************************************************************
//
************************************************************************/
#if defined(LZO_NEED_DICT_H)
#define DL_MIN_LEN M2_MIN_LEN
#define D_INDEX1(d,p) d = DM(DMUL(0x21,DX3(p,5,5,6)) >> 5)
#define D_INDEX2(d,p) d = (d & (D_MASK & 0x7ff)) ^ (D_HIGH | 0x1f)
#include "lzo_dict.h"
#ifndef MIN_LOOKAHEAD
#define MIN_LOOKAHEAD (M2_MAX_LEN + 1)
#endif
#ifndef MAX_LOOKBEHIND
#define MAX_LOOKBEHIND (MAX_OFFSET)
#endif
#endif /* defined(LZO_NEED_DICT_H) */
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* already included */
/*
vi:ts=4:et
*/
|
