| 1 | /* |
1 | /* |
| 2 | * Copyright (c) 2000-2003 Marc Alexander Lehmann <pcg@goof.com> |
2 | * Copyright (c) 2000-2007 Marc Alexander Lehmann <schmorp@schmorp.de> |
| 3 | * |
3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without modifica- |
4 | * Redistribution and use in source and binary forms, with or without modifica- |
| 5 | * tion, are permitted provided that the following conditions are met: |
5 | * tion, are permitted provided that the following conditions are met: |
| 6 | * |
6 | * |
| 7 | * 1. Redistributions of source code must retain the above copyright notice, |
7 | * 1. Redistributions of source code must retain the above copyright notice, |
| 8 | * this list of conditions and the following disclaimer. |
8 | * this list of conditions and the following disclaimer. |
| 9 | * |
9 | * |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
12 | * documentation and/or other materials provided with the distribution. |
| 13 | * |
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| 14 | * 3. The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
13 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
15 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
| 19 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
16 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
| 20 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
17 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
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… | |
| 22 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
19 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
| 23 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
20 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 24 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
21 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
| 25 | * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
22 | * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| 26 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
23 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
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24 | * |
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25 | * Alternatively, the contents of this file may be used under the terms of |
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26 | * the GNU General Public License ("GPL") version 2 or any later version, |
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27 | * in which case the provisions of the GPL are applicable instead of |
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28 | * the above. If you wish to allow the use of your version of this file |
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29 | * only under the terms of the GPL and not to allow others to use your |
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30 | * version of this file under the BSD license, indicate your decision |
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31 | * by deleting the provisions above and replace them with the notice |
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32 | * and other provisions required by the GPL. If you do not delete the |
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33 | * provisions above, a recipient may use your version of this file under |
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34 | * either the BSD or the GPL. |
| 27 | */ |
35 | */ |
| 28 | |
36 | |
| 29 | #include "lzfP.h" |
37 | #include "lzfP.h" |
| 30 | |
38 | |
| 31 | #define HSIZE (1 << (HLOG)) |
39 | #define HSIZE (1 << (HLOG)) |
| … | |
… | |
| 34 | * don't play with this unless you benchmark! |
42 | * don't play with this unless you benchmark! |
| 35 | * decompression is not dependent on the hash function |
43 | * decompression is not dependent on the hash function |
| 36 | * the hashing function might seem strange, just believe me |
44 | * the hashing function might seem strange, just believe me |
| 37 | * it works ;) |
45 | * it works ;) |
| 38 | */ |
46 | */ |
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47 | #ifndef FRST |
| 39 | #define FRST(p) (((p[0]) << 8) + p[1]) |
48 | # define FRST(p) (((p[0]) << 8) | p[1]) |
| 40 | #define NEXT(v,p) (((v) << 8) + p[2]) |
49 | # define NEXT(v,p) (((v) << 8) | p[2]) |
| 41 | #define IDX(h) ((((h ^ (h << 5)) >> (3*8 - HLOG)) + h*3) & (HSIZE - 1)) |
50 | # define IDX(h) ((((h ^ (h << 5)) >> (3*8 - HLOG)) - h*5) & (HSIZE - 1)) |
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51 | /*# define IDX(h) ((ip[0] * 121 ^ ip[1] * 33 ^ ip[2] * 1) & (HSIZE-1))*/ |
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52 | #endif |
| 42 | /* |
53 | /* |
| 43 | * IDX works because it is very similar to a multiplicative hash, e.g. |
54 | * IDX works because it is very similar to a multiplicative hash, e.g. |
| 44 | * (h * 57321 >> (3*8 - HLOG)) |
55 | * ((h * 57321 >> (3*8 - HLOG)) & (HSIZE - 1)) |
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56 | * the latter is also quite fast on newer CPUs, and compresses similarly. |
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57 | * |
| 45 | * the next one is also quite good, albeit slow ;) |
58 | * the next one is also quite good, albeit slow ;) |
| 46 | * (int)(cos(h & 0xffffff) * 1e6) |
59 | * (int)(cos(h & 0xffffff) * 1e6) |
| 47 | */ |
60 | */ |
| 48 | |
61 | |
| 49 | #if 0 |
62 | #if 0 |
| 50 | /* original lzv-like hash function */ |
63 | /* original lzv-like hash function, much worse and thus slower */ |
| 51 | # define FRST(p) (p[0] << 5) ^ p[1] |
64 | # define FRST(p) (p[0] << 5) ^ p[1] |
| 52 | # define NEXT(v,p) ((v) << 5) ^ p[2] |
65 | # define NEXT(v,p) ((v) << 5) ^ p[2] |
| 53 | # define IDX(h) ((h) & (HSIZE - 1)) |
66 | # define IDX(h) ((h) & (HSIZE - 1)) |
| 54 | #endif |
67 | #endif |
| 55 | |
68 | |
| 56 | #define MAX_LIT (1 << 5) |
69 | #define MAX_LIT (1 << 5) |
| 57 | #define MAX_OFF (1 << 13) |
70 | #define MAX_OFF (1 << 13) |
| 58 | #define MAX_REF ((1 << 8) + (1 << 3)) |
71 | #define MAX_REF ((1 << 8) + (1 << 3)) |
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72 | |
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73 | #if (__i386 || __amd64) && __GNUC__ >= 3 |
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74 | # define lzf_movsb(dst, src, len) \ |
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75 | asm ("rep movsb" \ |
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76 | : "=D" (dst), "=S" (src), "=c" (len) \ |
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77 | : "0" (dst), "1" (src), "2" (len)); |
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78 | #endif |
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79 | |
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80 | #if __GNUC__ >= 3 |
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81 | # define expect(expr,value) __builtin_expect ((expr),(value)) |
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82 | # define inline inline |
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83 | #else |
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84 | # define expect(expr,value) (expr) |
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85 | # define inline static |
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86 | #endif |
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87 | |
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88 | #define expect_false(expr) expect ((expr) != 0, 0) |
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89 | #define expect_true(expr) expect ((expr) != 0, 1) |
| 59 | |
90 | |
| 60 | /* |
91 | /* |
| 61 | * compressed format |
92 | * compressed format |
| 62 | * |
93 | * |
| 63 | * 000LLLLL <L+1> ; literal |
94 | * 000LLLLL <L+1> ; literal |
| 64 | * LLLOOOOO oooooooo ; backref L |
95 | * LLLooooo oooooooo ; backref L |
| 65 | * 111OOOOO LLLLLLLL oooooooo ; backref L+7 |
96 | * 111ooooo LLLLLLLL oooooooo ; backref L+7 |
| 66 | * |
97 | * |
| 67 | */ |
98 | */ |
| 68 | |
99 | |
| 69 | unsigned int |
100 | unsigned int |
| 70 | lzf_compress (const void *const in_data, unsigned int in_len, |
101 | lzf_compress (const void *const in_data, unsigned int in_len, |
| 71 | void *out_data, unsigned int out_len |
102 | void *out_data, unsigned int out_len |
| 72 | #if LZF_STATE_ARG |
103 | #if LZF_STATE_ARG |
| 73 | , LZF_STATE *htab |
104 | , LZF_STATE htab |
| 74 | #endif |
105 | #endif |
| 75 | ) |
106 | ) |
| 76 | { |
107 | { |
| 77 | #if !LZF_STATE_ARG |
108 | #if !LZF_STATE_ARG |
| 78 | LZF_STATE htab; |
109 | LZF_STATE htab; |
| … | |
… | |
| 87 | unsigned int hval = FRST (ip); |
118 | unsigned int hval = FRST (ip); |
| 88 | unsigned long off; |
119 | unsigned long off; |
| 89 | int lit = 0; |
120 | int lit = 0; |
| 90 | |
121 | |
| 91 | #if INIT_HTAB |
122 | #if INIT_HTAB |
| 92 | # if USE_MEMCPY |
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| 93 | memset (htab, 0, sizeof (htab)); |
123 | memset (htab, 0, sizeof (htab)); |
| 94 | # else |
124 | # if 0 |
| 95 | for (hslot = htab; hslot < htab + HSIZE; hslot++) |
125 | for (hslot = htab; hslot < htab + HSIZE; hslot++) |
| 96 | *hslot++ = ip; |
126 | *hslot++ = ip; |
| 97 | # endif |
127 | # endif |
| 98 | #endif |
128 | #endif |
| 99 | |
129 | |
| 100 | for (;;) |
130 | for (;;) |
| 101 | { |
131 | { |
| 102 | if (ip < in_end - 2) |
132 | if (expect_true (ip < in_end - 2)) |
| 103 | { |
133 | { |
| 104 | hval = NEXT (hval, ip); |
134 | hval = NEXT (hval, ip); |
| 105 | hslot = htab + IDX (hval); |
135 | hslot = htab + IDX (hval); |
| 106 | ref = *hslot; *hslot = ip; |
136 | ref = *hslot; *hslot = ip; |
| 107 | |
137 | |
| … | |
… | |
| 125 | /* match found at *ref++ */ |
155 | /* match found at *ref++ */ |
| 126 | unsigned int len = 2; |
156 | unsigned int len = 2; |
| 127 | unsigned int maxlen = in_end - ip - len; |
157 | unsigned int maxlen = in_end - ip - len; |
| 128 | maxlen = maxlen > MAX_REF ? MAX_REF : maxlen; |
158 | maxlen = maxlen > MAX_REF ? MAX_REF : maxlen; |
| 129 | |
159 | |
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160 | if (expect_false (op + lit + 1 + 3 >= out_end)) |
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161 | return 0; |
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162 | |
| 130 | do |
163 | do |
| 131 | len++; |
164 | len++; |
| 132 | while (len < maxlen && ref[len] == ip[len]); |
165 | while (len < maxlen && ref[len] == ip[len]); |
| 133 | |
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| 134 | if (op + lit + 1 + 3 >= out_end) |
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| 135 | return 0; |
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| 136 | |
166 | |
| 137 | if (lit) |
167 | if (lit) |
| 138 | { |
168 | { |
| 139 | *op++ = lit - 1; |
169 | *op++ = lit - 1; |
| 140 | lit = -lit; |
170 | lit = -lit; |
| … | |
… | |
| 156 | *op++ = len - 7; |
186 | *op++ = len - 7; |
| 157 | } |
187 | } |
| 158 | |
188 | |
| 159 | *op++ = off; |
189 | *op++ = off; |
| 160 | |
190 | |
| 161 | #if ULTRA_FAST |
191 | #if ULTRA_FAST || VERY_FAST |
| 162 | ip += len; |
192 | ip += len; |
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193 | #if VERY_FAST && !ULTRA_FAST |
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194 | --ip; |
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195 | #endif |
| 163 | hval = FRST (ip); |
196 | hval = FRST (ip); |
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197 | |
| 164 | hval = NEXT (hval, ip); |
198 | hval = NEXT (hval, ip); |
| 165 | htab[IDX (hval)] = ip; |
199 | htab[IDX (hval)] = ip; |
| 166 | ip++; |
200 | ip++; |
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201 | |
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202 | #if VERY_FAST && !ULTRA_FAST |
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203 | hval = NEXT (hval, ip); |
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204 | htab[IDX (hval)] = ip; |
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205 | ip++; |
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206 | #endif |
| 167 | #else |
207 | #else |
| 168 | do |
208 | do |
| 169 | { |
209 | { |
| 170 | hval = NEXT (hval, ip); |
210 | hval = NEXT (hval, ip); |
| 171 | htab[IDX (hval)] = ip; |
211 | htab[IDX (hval)] = ip; |
| … | |
… | |
| 174 | while (len--); |
214 | while (len--); |
| 175 | #endif |
215 | #endif |
| 176 | continue; |
216 | continue; |
| 177 | } |
217 | } |
| 178 | } |
218 | } |
| 179 | else if (ip == in_end) |
219 | else if (expect_false (ip == in_end)) |
| 180 | break; |
220 | break; |
| 181 | |
221 | |
| 182 | /* one more literal byte we must copy */ |
222 | /* one more literal byte we must copy */ |
| 183 | lit++; |
223 | lit++; |
| 184 | ip++; |
224 | ip++; |
| 185 | |
225 | |
| 186 | if (lit == MAX_LIT) |
226 | if (expect_false (lit == MAX_LIT)) |
| 187 | { |
227 | { |
| 188 | if (op + 1 + MAX_LIT >= out_end) |
228 | if (op + 1 + MAX_LIT >= out_end) |
| 189 | return 0; |
229 | return 0; |
| 190 | |
230 | |
| 191 | *op++ = MAX_LIT - 1; |
231 | *op++ = MAX_LIT - 1; |
| 192 | #if USE_MEMCPY |
232 | |
| 193 | memcpy (op, ip - MAX_LIT, MAX_LIT); |
233 | #ifdef lzf_movsb |
| 194 | op += MAX_LIT; |
234 | ip -= lit; |
| 195 | lit = 0; |
235 | lzf_movsb (op, ip, lit); |
| 196 | #else |
236 | #else |
| 197 | lit = -lit; |
237 | lit = -lit; |
| 198 | do |
238 | do |
| 199 | *op++ = ip[lit]; |
239 | *op++ = ip[lit]; |
| 200 | while (++lit); |
240 | while (++lit); |
| … | |
… | |
| 206 | { |
246 | { |
| 207 | if (op + lit + 1 >= out_end) |
247 | if (op + lit + 1 >= out_end) |
| 208 | return 0; |
248 | return 0; |
| 209 | |
249 | |
| 210 | *op++ = lit - 1; |
250 | *op++ = lit - 1; |
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251 | #ifdef lzf_movsb |
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252 | ip -= lit; |
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253 | lzf_movsb (op, ip, lit); |
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254 | #else |
| 211 | lit = -lit; |
255 | lit = -lit; |
| 212 | do |
256 | do |
| 213 | *op++ = ip[lit]; |
257 | *op++ = ip[lit]; |
| 214 | while (++lit); |
258 | while (++lit); |
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259 | #endif |
| 215 | } |
260 | } |
| 216 | |
261 | |
| 217 | return op - (u8 *) out_data; |
262 | return op - (u8 *) out_data; |
| 218 | } |
263 | } |
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264 | |
