| 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 version 2 (the "GPL"), in which case the |
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27 | * provisions of the GPL are applicable instead of the above. If you wish to |
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28 | * allow the use of your version of this file only under the terms of the |
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29 | * GPL and not to allow others to use your version of this file under the |
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30 | * BSD license, indicate your decision by deleting the provisions above and |
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31 | * replace them with the notice and other provisions required by the GPL. If |
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32 | * you do not delete the provisions above, a recipient may use your version |
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33 | * of this file under either the BSD or the GPL. |
| 27 | */ |
34 | */ |
| 28 | |
35 | |
| 29 | #include "lzfP.h" |
36 | #include "lzfP.h" |
| 30 | |
37 | |
| 31 | #define HSIZE (1 << (HLOG)) |
38 | #define HSIZE (1 << (HLOG)) |
| … | |
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| 34 | * don't play with this unless you benchmark! |
41 | * don't play with this unless you benchmark! |
| 35 | * decompression is not dependent on the hash function |
42 | * decompression is not dependent on the hash function |
| 36 | * the hashing function might seem strange, just believe me |
43 | * the hashing function might seem strange, just believe me |
| 37 | * it works ;) |
44 | * it works ;) |
| 38 | */ |
45 | */ |
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46 | #ifndef FRST |
| 39 | #define FRST(p) (((p[0]) << 8) + p[1]) |
47 | # define FRST(p) (((p[0]) << 8) | p[1]) |
| 40 | #define NEXT(v,p) (((v) << 8) + p[2]) |
48 | # define NEXT(v,p) (((v) << 8) | p[2]) |
| 41 | #define IDX(h) ((((h ^ (h << 5)) >> (3*8 - HLOG)) + h*3) & (HSIZE - 1)) |
49 | # define IDX(h) ((((h ^ (h << 5)) >> (3*8 - HLOG)) - h*5) & (HSIZE - 1)) |
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50 | /*# define IDX(h) ((ip[0] * 121 ^ ip[1] * 33 ^ ip[2] * 1) & (HSIZE-1))*/ |
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51 | #endif |
| 42 | /* |
52 | /* |
| 43 | * IDX works because it is very similar to a multiplicative hash, e.g. |
53 | * IDX works because it is very similar to a multiplicative hash, e.g. |
| 44 | * (h * 57321 >> (3*8 - HLOG)) |
54 | * ((h * 57321 >> (3*8 - HLOG)) & (HSIZE - 1)) |
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55 | * the latter is also quite fast on newer CPUs, and compresses similarly. |
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56 | * |
| 45 | * the next one is also quite good, albeit slow ;) |
57 | * the next one is also quite good, albeit slow ;) |
| 46 | * (int)(cos(h & 0xffffff) * 1e6) |
58 | * (int)(cos(h & 0xffffff) * 1e6) |
| 47 | */ |
59 | */ |
| 48 | |
60 | |
| 49 | #if 0 |
61 | #if 0 |
| 50 | /* original lzv-like hash function */ |
62 | /* original lzv-like hash function, much worse and thus slower */ |
| 51 | # define FRST(p) (p[0] << 5) ^ p[1] |
63 | # define FRST(p) (p[0] << 5) ^ p[1] |
| 52 | # define NEXT(v,p) ((v) << 5) ^ p[2] |
64 | # define NEXT(v,p) ((v) << 5) ^ p[2] |
| 53 | # define IDX(h) ((h) & (HSIZE - 1)) |
65 | # define IDX(h) ((h) & (HSIZE - 1)) |
| 54 | #endif |
66 | #endif |
| 55 | |
67 | |
| 56 | #define MAX_LIT (1 << 5) |
68 | #define MAX_LIT (1 << 5) |
| 57 | #define MAX_OFF (1 << 13) |
69 | #define MAX_OFF (1 << 13) |
| 58 | #define MAX_REF ((1 << 8) + (1 << 3)) |
70 | #define MAX_REF ((1 << 8) + (1 << 3)) |
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71 | |
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72 | #if (__i386 || __amd64) && __GNUC__ >= 3 |
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73 | # define lzf_movsb(dst, src, len) \ |
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74 | asm ("rep movsb" \ |
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75 | : "=D" (dst), "=S" (src), "=c" (len) \ |
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76 | : "0" (dst), "1" (src), "2" (len)); |
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77 | #endif |
| 59 | |
78 | |
| 60 | /* |
79 | /* |
| 61 | * compressed format |
80 | * compressed format |
| 62 | * |
81 | * |
| 63 | * 000LLLLL <L+1> ; literal |
82 | * 000LLLLL <L+1> ; literal |
| 64 | * LLLOOOOO oooooooo ; backref L |
83 | * LLLooooo oooooooo ; backref L |
| 65 | * 111OOOOO LLLLLLLL oooooooo ; backref L+7 |
84 | * 111ooooo LLLLLLLL oooooooo ; backref L+7 |
| 66 | * |
85 | * |
| 67 | */ |
86 | */ |
| 68 | |
87 | |
| 69 | unsigned int |
88 | unsigned int |
| 70 | lzf_compress (const void *const in_data, unsigned int in_len, |
89 | lzf_compress (const void *const in_data, unsigned int in_len, |
| 71 | void *out_data, unsigned int out_len |
90 | void *out_data, unsigned int out_len |
| 72 | #if LZF_STATE_ARG |
91 | #if LZF_STATE_ARG |
| 73 | , LZF_STATE *htab |
92 | , LZF_STATE htab |
| 74 | #endif |
93 | #endif |
| 75 | ) |
94 | ) |
| 76 | { |
95 | { |
| 77 | #if !LZF_STATE_ARG |
96 | #if !LZF_STATE_ARG |
| 78 | LZF_STATE htab; |
97 | LZF_STATE htab; |
| … | |
… | |
| 87 | unsigned int hval = FRST (ip); |
106 | unsigned int hval = FRST (ip); |
| 88 | unsigned long off; |
107 | unsigned long off; |
| 89 | int lit = 0; |
108 | int lit = 0; |
| 90 | |
109 | |
| 91 | #if INIT_HTAB |
110 | #if INIT_HTAB |
| 92 | # if USE_MEMCPY |
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| 93 | memset (htab, 0, sizeof (htab)); |
111 | memset (htab, 0, sizeof (htab)); |
| 94 | # else |
112 | # if 0 |
| 95 | for (hslot = htab; hslot < htab + HSIZE; hslot++) |
113 | for (hslot = htab; hslot < htab + HSIZE; hslot++) |
| 96 | *hslot++ = ip; |
114 | *hslot++ = ip; |
| 97 | # endif |
115 | # endif |
| 98 | #endif |
116 | #endif |
| 99 | |
117 | |
| 100 | for (;;) |
118 | for (;;) |
| 101 | { |
119 | { |
| … | |
… | |
| 125 | /* match found at *ref++ */ |
143 | /* match found at *ref++ */ |
| 126 | unsigned int len = 2; |
144 | unsigned int len = 2; |
| 127 | unsigned int maxlen = in_end - ip - len; |
145 | unsigned int maxlen = in_end - ip - len; |
| 128 | maxlen = maxlen > MAX_REF ? MAX_REF : maxlen; |
146 | maxlen = maxlen > MAX_REF ? MAX_REF : maxlen; |
| 129 | |
147 | |
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148 | if (op + lit + 1 + 3 >= out_end) |
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149 | return 0; |
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150 | |
| 130 | do |
151 | do |
| 131 | len++; |
152 | len++; |
| 132 | while (len < maxlen && ref[len] == ip[len]); |
153 | 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 | |
154 | |
| 137 | if (lit) |
155 | if (lit) |
| 138 | { |
156 | { |
| 139 | *op++ = lit - 1; |
157 | *op++ = lit - 1; |
| 140 | lit = -lit; |
158 | lit = -lit; |
| … | |
… | |
| 156 | *op++ = len - 7; |
174 | *op++ = len - 7; |
| 157 | } |
175 | } |
| 158 | |
176 | |
| 159 | *op++ = off; |
177 | *op++ = off; |
| 160 | |
178 | |
| 161 | #if ULTRA_FAST |
179 | #if ULTRA_FAST || VERY_FAST |
| 162 | ip += len; |
180 | ip += len; |
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181 | #if VERY_FAST && !ULTRA_FAST |
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182 | --ip; |
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183 | #endif |
| 163 | hval = FRST (ip); |
184 | hval = FRST (ip); |
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185 | |
| 164 | hval = NEXT (hval, ip); |
186 | hval = NEXT (hval, ip); |
| 165 | htab[IDX (hval)] = ip; |
187 | htab[IDX (hval)] = ip; |
| 166 | ip++; |
188 | ip++; |
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189 | |
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190 | #if VERY_FAST && !ULTRA_FAST |
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191 | hval = NEXT (hval, ip); |
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192 | htab[IDX (hval)] = ip; |
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193 | ip++; |
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194 | #endif |
| 167 | #else |
195 | #else |
| 168 | do |
196 | do |
| 169 | { |
197 | { |
| 170 | hval = NEXT (hval, ip); |
198 | hval = NEXT (hval, ip); |
| 171 | htab[IDX (hval)] = ip; |
199 | htab[IDX (hval)] = ip; |
| … | |
… | |
| 187 | { |
215 | { |
| 188 | if (op + 1 + MAX_LIT >= out_end) |
216 | if (op + 1 + MAX_LIT >= out_end) |
| 189 | return 0; |
217 | return 0; |
| 190 | |
218 | |
| 191 | *op++ = MAX_LIT - 1; |
219 | *op++ = MAX_LIT - 1; |
| 192 | #if USE_MEMCPY |
220 | |
| 193 | memcpy (op, ip - MAX_LIT, MAX_LIT); |
221 | #ifdef lzf_movsb |
| 194 | op += MAX_LIT; |
222 | ip -= lit; |
| 195 | lit = 0; |
223 | lzf_movsb (op, ip, lit); |
| 196 | #else |
224 | #else |
| 197 | lit = -lit; |
225 | lit = -lit; |
| 198 | do |
226 | do |
| 199 | *op++ = ip[lit]; |
227 | *op++ = ip[lit]; |
| 200 | while (++lit); |
228 | while (++lit); |
| … | |
… | |
| 206 | { |
234 | { |
| 207 | if (op + lit + 1 >= out_end) |
235 | if (op + lit + 1 >= out_end) |
| 208 | return 0; |
236 | return 0; |
| 209 | |
237 | |
| 210 | *op++ = lit - 1; |
238 | *op++ = lit - 1; |
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239 | #ifdef lzf_movsb |
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240 | ip -= lit; |
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241 | lzf_movsb (op, ip, lit); |
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242 | #else |
| 211 | lit = -lit; |
243 | lit = -lit; |
| 212 | do |
244 | do |
| 213 | *op++ = ip[lit]; |
245 | *op++ = ip[lit]; |
| 214 | while (++lit); |
246 | while (++lit); |
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247 | #endif |
| 215 | } |
248 | } |
| 216 | |
249 | |
| 217 | return op - (u8 *) out_data; |
250 | return op - (u8 *) out_data; |
| 218 | } |
251 | } |
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252 | |
