| 1 | /* |
1 | /* |
| 2 | * Copyright (c) 2000-2005 Marc Alexander Lehmann <schmorp@schmorp.de> |
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- |
| … | |
… | |
| 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. |
| 27 | * |
24 | * |
| 28 | * Alternatively, the contents of this file may be used under the terms of |
25 | * Alternatively, the contents of this file may be used under the terms of |
| 29 | * the GNU General Public License version 2 (the "GPL"), in which case the |
26 | * the GNU General Public License ("GPL") version 2 or any later version, |
| 30 | * provisions of the GPL are applicable instead of the above. If you wish to |
27 | * in which case the provisions of the GPL are applicable instead of |
| 31 | * allow the use of your version of this file only under the terms of the |
28 | * the above. If you wish to allow the use of your version of this file |
| 32 | * GPL and not to allow others to use your version of this file under the |
29 | * only under the terms of the GPL and not to allow others to use your |
| 33 | * BSD license, indicate your decision by deleting the provisions above and |
30 | * version of this file under the BSD license, indicate your decision |
| 34 | * replace them with the notice and other provisions required by the GPL. If |
31 | * by deleting the provisions above and replace them with the notice |
| 35 | * you do not delete the provisions above, a recipient may use your version |
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 |
| 36 | * of this file under either the BSD or the GPL. |
34 | * either the BSD or the GPL. |
| 37 | */ |
35 | */ |
| 38 | |
36 | |
| 39 | #include "lzfP.h" |
37 | #include "lzfP.h" |
| 40 | |
38 | |
| 41 | #define HSIZE (1 << (HLOG)) |
39 | #define HSIZE (1 << (HLOG)) |
| … | |
… | |
| 69 | #endif |
67 | #endif |
| 70 | |
68 | |
| 71 | #define MAX_LIT (1 << 5) |
69 | #define MAX_LIT (1 << 5) |
| 72 | #define MAX_OFF (1 << 13) |
70 | #define MAX_OFF (1 << 13) |
| 73 | #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) |
| 74 | |
90 | |
| 75 | /* |
91 | /* |
| 76 | * compressed format |
92 | * compressed format |
| 77 | * |
93 | * |
| 78 | * 000LLLLL <L+1> ; literal |
94 | * 000LLLLL <L+1> ; literal |
| … | |
… | |
| 102 | unsigned int hval = FRST (ip); |
118 | unsigned int hval = FRST (ip); |
| 103 | unsigned long off; |
119 | unsigned long off; |
| 104 | int lit = 0; |
120 | int lit = 0; |
| 105 | |
121 | |
| 106 | #if INIT_HTAB |
122 | #if INIT_HTAB |
| 107 | # if USE_MEMCPY |
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| 108 | memset (htab, 0, sizeof (htab)); |
123 | memset (htab, 0, sizeof (htab)); |
| 109 | # else |
124 | # if 0 |
| 110 | for (hslot = htab; hslot < htab + HSIZE; hslot++) |
125 | for (hslot = htab; hslot < htab + HSIZE; hslot++) |
| 111 | *hslot++ = ip; |
126 | *hslot++ = ip; |
| 112 | # endif |
127 | # endif |
| 113 | #endif |
128 | #endif |
| 114 | |
129 | |
| 115 | for (;;) |
130 | for (;;) |
| 116 | { |
131 | { |
| 117 | if (ip < in_end - 2) |
132 | if (expect_true (ip < in_end - 2)) |
| 118 | { |
133 | { |
| 119 | hval = NEXT (hval, ip); |
134 | hval = NEXT (hval, ip); |
| 120 | hslot = htab + IDX (hval); |
135 | hslot = htab + IDX (hval); |
| 121 | ref = *hslot; *hslot = ip; |
136 | ref = *hslot; *hslot = ip; |
| 122 | |
137 | |
| … | |
… | |
| 140 | /* match found at *ref++ */ |
155 | /* match found at *ref++ */ |
| 141 | unsigned int len = 2; |
156 | unsigned int len = 2; |
| 142 | unsigned int maxlen = in_end - ip - len; |
157 | unsigned int maxlen = in_end - ip - len; |
| 143 | maxlen = maxlen > MAX_REF ? MAX_REF : maxlen; |
158 | maxlen = maxlen > MAX_REF ? MAX_REF : maxlen; |
| 144 | |
159 | |
| 145 | if (op + lit + 1 + 3 >= out_end) |
160 | if (expect_false (op + lit + 1 + 3 >= out_end)) |
| 146 | return 0; |
161 | return 0; |
| 147 | |
162 | |
| 148 | do |
163 | do |
| 149 | len++; |
164 | len++; |
| 150 | while (len < maxlen && ref[len] == ip[len]); |
165 | while (len < maxlen && ref[len] == ip[len]); |
| … | |
… | |
| 199 | while (len--); |
214 | while (len--); |
| 200 | #endif |
215 | #endif |
| 201 | continue; |
216 | continue; |
| 202 | } |
217 | } |
| 203 | } |
218 | } |
| 204 | else if (ip == in_end) |
219 | else if (expect_false (ip == in_end)) |
| 205 | break; |
220 | break; |
| 206 | |
221 | |
| 207 | /* one more literal byte we must copy */ |
222 | /* one more literal byte we must copy */ |
| 208 | lit++; |
223 | lit++; |
| 209 | ip++; |
224 | ip++; |
| 210 | |
225 | |
| 211 | if (lit == MAX_LIT) |
226 | if (expect_false (lit == MAX_LIT)) |
| 212 | { |
227 | { |
| 213 | if (op + 1 + MAX_LIT >= out_end) |
228 | if (op + 1 + MAX_LIT >= out_end) |
| 214 | return 0; |
229 | return 0; |
| 215 | |
230 | |
| 216 | *op++ = MAX_LIT - 1; |
231 | *op++ = MAX_LIT - 1; |
| 217 | #if USE_MEMCPY |
232 | |
| 218 | memcpy (op, ip - MAX_LIT, MAX_LIT); |
233 | #ifdef lzf_movsb |
| 219 | op += MAX_LIT; |
234 | ip -= lit; |
| 220 | lit = 0; |
235 | lzf_movsb (op, ip, lit); |
| 221 | #else |
236 | #else |
| 222 | lit = -lit; |
237 | lit = -lit; |
| 223 | do |
238 | do |
| 224 | *op++ = ip[lit]; |
239 | *op++ = ip[lit]; |
| 225 | while (++lit); |
240 | while (++lit); |
| … | |
… | |
| 231 | { |
246 | { |
| 232 | if (op + lit + 1 >= out_end) |
247 | if (op + lit + 1 >= out_end) |
| 233 | return 0; |
248 | return 0; |
| 234 | |
249 | |
| 235 | *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 |
| 236 | lit = -lit; |
255 | lit = -lit; |
| 237 | do |
256 | do |
| 238 | *op++ = ip[lit]; |
257 | *op++ = ip[lit]; |
| 239 | while (++lit); |
258 | while (++lit); |
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259 | #endif |
| 240 | } |
260 | } |
| 241 | |
261 | |
| 242 | return op - (u8 *) out_data; |
262 | return op - (u8 *) out_data; |
| 243 | } |
263 | } |
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264 | |
