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
|
/* lzo_dict.h -- dictionary definitions for the the LZO library
This file is part of the LZO real-time data compression library.
Copyright (C) 1996-2017 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_DICT_H
#define __LZO_DICT_H 1
#ifdef __cplusplus
extern "C" {
#endif
/***********************************************************************
// dictionary size
************************************************************************/
/* dictionary needed for compression */
#if !defined(D_BITS) && defined(DBITS)
# define D_BITS DBITS
#endif
#if !defined(D_BITS)
# error "D_BITS is not defined"
#endif
#if (D_BITS < 16)
# define D_SIZE LZO_SIZE(D_BITS)
# define D_MASK LZO_MASK(D_BITS)
#else
# define D_SIZE LZO_USIZE(D_BITS)
# define D_MASK LZO_UMASK(D_BITS)
#endif
#define D_HIGH ((D_MASK >> 1) + 1)
/* dictionary depth */
#if !defined(DD_BITS)
# define DD_BITS 0
#endif
#define DD_SIZE LZO_SIZE(DD_BITS)
#define DD_MASK LZO_MASK(DD_BITS)
/* dictionary length */
#if !defined(DL_BITS)
# define DL_BITS (D_BITS - DD_BITS)
#endif
#if (DL_BITS < 16)
# define DL_SIZE LZO_SIZE(DL_BITS)
# define DL_MASK LZO_MASK(DL_BITS)
#else
# define DL_SIZE LZO_USIZE(DL_BITS)
# define DL_MASK LZO_UMASK(DL_BITS)
#endif
#if (D_BITS != DL_BITS + DD_BITS)
# error "D_BITS does not match"
#endif
#if (D_BITS < 6 || D_BITS > 18)
# error "invalid D_BITS"
#endif
#if (DL_BITS < 6 || DL_BITS > 20)
# error "invalid DL_BITS"
#endif
#if (DD_BITS < 0 || DD_BITS > 6)
# error "invalid DD_BITS"
#endif
#if !defined(DL_MIN_LEN)
# define DL_MIN_LEN 3
#endif
#if !defined(DL_SHIFT)
# define DL_SHIFT ((DL_BITS + (DL_MIN_LEN - 1)) / DL_MIN_LEN)
#endif
/***********************************************************************
// dictionary access
************************************************************************/
#define LZO_HASH_GZIP 1
#define LZO_HASH_GZIP_INCREMENTAL 2
#define LZO_HASH_LZO_INCREMENTAL_A 3
#define LZO_HASH_LZO_INCREMENTAL_B 4
#if !defined(LZO_HASH)
# error "choose a hashing strategy"
#endif
#undef DM
#undef DX
#if (DL_MIN_LEN == 3)
# define _DV2_A(p,shift1,shift2) \
(((( (lzo_xint)((p)[0]) << shift1) ^ (p)[1]) << shift2) ^ (p)[2])
# define _DV2_B(p,shift1,shift2) \
(((( (lzo_xint)((p)[2]) << shift1) ^ (p)[1]) << shift2) ^ (p)[0])
# define _DV3_B(p,shift1,shift2,shift3) \
((_DV2_B((p)+1,shift1,shift2) << (shift3)) ^ (p)[0])
#elif (DL_MIN_LEN == 2)
# define _DV2_A(p,shift1,shift2) \
(( (lzo_xint)(p[0]) << shift1) ^ p[1])
# define _DV2_B(p,shift1,shift2) \
(( (lzo_xint)(p[1]) << shift1) ^ p[2])
#else
# error "invalid DL_MIN_LEN"
#endif
#define _DV_A(p,shift) _DV2_A(p,shift,shift)
#define _DV_B(p,shift) _DV2_B(p,shift,shift)
#define DA2(p,s1,s2) \
(((((lzo_xint)((p)[2]) << (s2)) + (p)[1]) << (s1)) + (p)[0])
#define DS2(p,s1,s2) \
(((((lzo_xint)((p)[2]) << (s2)) - (p)[1]) << (s1)) - (p)[0])
#define DX2(p,s1,s2) \
(((((lzo_xint)((p)[2]) << (s2)) ^ (p)[1]) << (s1)) ^ (p)[0])
#define DA3(p,s1,s2,s3) ((DA2((p)+1,s2,s3) << (s1)) + (p)[0])
#define DS3(p,s1,s2,s3) ((DS2((p)+1,s2,s3) << (s1)) - (p)[0])
#define DX3(p,s1,s2,s3) ((DX2((p)+1,s2,s3) << (s1)) ^ (p)[0])
#define DMS(v,s) ((lzo_uint) (((v) & (D_MASK >> (s))) << (s)))
#define DM(v) DMS(v,0)
#if (LZO_HASH == LZO_HASH_GZIP)
/* hash function like in gzip/zlib (deflate) */
# define _DINDEX(dv,p) (_DV_A((p),DL_SHIFT))
#elif (LZO_HASH == LZO_HASH_GZIP_INCREMENTAL)
/* incremental hash like in gzip/zlib (deflate) */
# define __LZO_HASH_INCREMENTAL 1
# define DVAL_FIRST(dv,p) dv = _DV_A((p),DL_SHIFT)
# define DVAL_NEXT(dv,p) dv = (((dv) << DL_SHIFT) ^ p[2])
# define _DINDEX(dv,p) (dv)
# define DVAL_LOOKAHEAD DL_MIN_LEN
#elif (LZO_HASH == LZO_HASH_LZO_INCREMENTAL_A)
/* incremental LZO hash version A */
# define __LZO_HASH_INCREMENTAL 1
# define DVAL_FIRST(dv,p) dv = _DV_A((p),5)
# define DVAL_NEXT(dv,p) \
dv ^= (lzo_xint)(p[-1]) << (2*5); dv = (((dv) << 5) ^ p[2])
# define _DINDEX(dv,p) ((DMUL(0x9f5f,dv)) >> 5)
# define DVAL_LOOKAHEAD DL_MIN_LEN
#elif (LZO_HASH == LZO_HASH_LZO_INCREMENTAL_B)
/* incremental LZO hash version B */
# define __LZO_HASH_INCREMENTAL 1
# define DVAL_FIRST(dv,p) dv = _DV_B((p),5)
# define DVAL_NEXT(dv,p) \
dv ^= p[-1]; dv = (((dv) >> 5) ^ ((lzo_xint)(p[2]) << (2*5)))
# define _DINDEX(dv,p) ((DMUL(0x9f5f,dv)) >> 5)
# define DVAL_LOOKAHEAD DL_MIN_LEN
#else
# error "choose a hashing strategy"
#endif
#ifndef DINDEX
#define DINDEX(dv,p) ((lzo_uint)((_DINDEX(dv,p)) & DL_MASK) << DD_BITS)
#endif
#if !defined(DINDEX1) && defined(D_INDEX1)
#define DINDEX1 D_INDEX1
#endif
#if !defined(DINDEX2) && defined(D_INDEX2)
#define DINDEX2 D_INDEX2
#endif
#if !defined(__LZO_HASH_INCREMENTAL)
# define DVAL_FIRST(dv,p) ((void) 0)
# define DVAL_NEXT(dv,p) ((void) 0)
# define DVAL_LOOKAHEAD 0
#endif
#if !defined(DVAL_ASSERT)
#if defined(__LZO_HASH_INCREMENTAL) && !defined(NDEBUG)
#if 1 && (LZO_CC_ARMCC_GNUC || LZO_CC_CLANG || (LZO_CC_GNUC >= 0x020700ul) || LZO_CC_INTELC_GNUC || LZO_CC_LLVM || LZO_CC_PATHSCALE || LZO_CC_PGI)
static void __attribute__((__unused__))
#else
static void
#endif
DVAL_ASSERT(lzo_xint dv, const lzo_bytep p)
{
lzo_xint df;
DVAL_FIRST(df,(p));
assert(DINDEX(dv,p) == DINDEX(df,p));
}
#else
# define DVAL_ASSERT(dv,p) ((void) 0)
#endif
#endif
/***********************************************************************
// dictionary updating
************************************************************************/
#if (LZO_DICT_USE_PTR)
# define DENTRY(p,in) (p)
# define GINDEX(m_pos,m_off,dict,dindex,in) m_pos = dict[dindex]
#else
# define DENTRY(p,in) ((lzo_dict_t) pd(p, in))
# define GINDEX(m_pos,m_off,dict,dindex,in) m_off = dict[dindex]
#endif
#if (DD_BITS == 0)
# define UPDATE_D(dict,drun,dv,p,in) dict[ DINDEX(dv,p) ] = DENTRY(p,in)
# define UPDATE_I(dict,drun,index,p,in) dict[index] = DENTRY(p,in)
# define UPDATE_P(ptr,drun,p,in) (ptr)[0] = DENTRY(p,in)
#else
# define UPDATE_D(dict,drun,dv,p,in) \
dict[ DINDEX(dv,p) + drun++ ] = DENTRY(p,in); drun &= DD_MASK
# define UPDATE_I(dict,drun,index,p,in) \
dict[ (index) + drun++ ] = DENTRY(p,in); drun &= DD_MASK
# define UPDATE_P(ptr,drun,p,in) \
(ptr) [ drun++ ] = DENTRY(p,in); drun &= DD_MASK
#endif
/***********************************************************************
// test for a match
************************************************************************/
#if (LZO_DICT_USE_PTR)
/* m_pos is either NULL or a valid pointer */
#define LZO_CHECK_MPOS_DET(m_pos,m_off,in,ip,max_offset) \
(m_pos == NULL || (m_off = pd(ip, m_pos)) > max_offset)
/* m_pos may point anywhere... */
#define LZO_CHECK_MPOS_NON_DET(m_pos,m_off,in,ip,max_offset) \
(BOUNDS_CHECKING_OFF_IN_EXPR(( \
m_pos = ip - (lzo_uint) PTR_DIFF(ip,m_pos), \
PTR_LT(m_pos,in) || \
(m_off = (lzo_uint) PTR_DIFF(ip,m_pos)) == 0 || \
m_off > max_offset )))
#else
#define LZO_CHECK_MPOS_DET(m_pos,m_off,in,ip,max_offset) \
(m_off == 0 || \
((m_off = pd(ip, in) - m_off) > max_offset) || \
(m_pos = (ip) - (m_off), 0) )
#define LZO_CHECK_MPOS_NON_DET(m_pos,m_off,in,ip,max_offset) \
(pd(ip, in) <= m_off || \
((m_off = pd(ip, in) - m_off) > max_offset) || \
(m_pos = (ip) - (m_off), 0) )
#endif
#if (LZO_DETERMINISTIC)
# define LZO_CHECK_MPOS LZO_CHECK_MPOS_DET
#else
# define LZO_CHECK_MPOS LZO_CHECK_MPOS_NON_DET
#endif
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* already included */
/* vim:set ts=4 sw=4 et: */
|
