| 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)) |
| … | |
… | |
| 48 | */ |
46 | */ |
| 49 | #ifndef FRST |
47 | #ifndef FRST |
| 50 | # define FRST(p) (((p[0]) << 8) | p[1]) |
48 | # define FRST(p) (((p[0]) << 8) | p[1]) |
| 51 | # define NEXT(v,p) (((v) << 8) | p[2]) |
49 | # define NEXT(v,p) (((v) << 8) | p[2]) |
| 52 | # define IDX(h) ((((h ^ (h << 5)) >> (3*8 - HLOG)) - h*5) & (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))*/ |
| 53 | #endif |
52 | #endif |
| 54 | /* |
53 | /* |
| 55 | * 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. |
| 56 | * ((h * 57321 >> (3*8 - HLOG)) & (HSIZE - 1)) |
55 | * ((h * 57321 >> (3*8 - HLOG)) & (HSIZE - 1)) |
| 57 | * the latter is also quite fast on newer CPUs, and sligthly better |
56 | * the latter is also quite fast on newer CPUs, and compresses similarly. |
| 58 | * |
57 | * |
| 59 | * the next one is also quite good, albeit slow ;) |
58 | * the next one is also quite good, albeit slow ;) |
| 60 | * (int)(cos(h & 0xffffff) * 1e6) |
59 | * (int)(cos(h & 0xffffff) * 1e6) |
| 61 | */ |
60 | */ |
| 62 | |
61 | |
| … | |
… | |
| 67 | # define IDX(h) ((h) & (HSIZE - 1)) |
66 | # define IDX(h) ((h) & (HSIZE - 1)) |
| 68 | #endif |
67 | #endif |
| 69 | |
68 | |
| 70 | #define MAX_LIT (1 << 5) |
69 | #define MAX_LIT (1 << 5) |
| 71 | #define MAX_OFF (1 << 13) |
70 | #define MAX_OFF (1 << 13) |
| 72 | #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 |
| 73 | |
79 | |
| 74 | /* |
80 | /* |
| 75 | * compressed format |
81 | * compressed format |
| 76 | * |
82 | * |
| 77 | * 000LLLLL <L+1> ; literal |
83 | * 000LLLLL <L+1> ; literal |
| … | |
… | |
| 82 | |
88 | |
| 83 | unsigned int |
89 | unsigned int |
| 84 | lzf_compress (const void *const in_data, unsigned int in_len, |
90 | lzf_compress (const void *const in_data, unsigned int in_len, |
| 85 | void *out_data, unsigned int out_len |
91 | void *out_data, unsigned int out_len |
| 86 | #if LZF_STATE_ARG |
92 | #if LZF_STATE_ARG |
| 87 | , LZF_STATE *htab |
93 | , LZF_STATE htab |
| 88 | #endif |
94 | #endif |
| 89 | ) |
95 | ) |
| 90 | { |
96 | { |
| 91 | #if !LZF_STATE_ARG |
97 | #if !LZF_STATE_ARG |
| 92 | LZF_STATE htab; |
98 | LZF_STATE htab; |
| … | |
… | |
| 101 | unsigned int hval = FRST (ip); |
107 | unsigned int hval = FRST (ip); |
| 102 | unsigned long off; |
108 | unsigned long off; |
| 103 | int lit = 0; |
109 | int lit = 0; |
| 104 | |
110 | |
| 105 | #if INIT_HTAB |
111 | #if INIT_HTAB |
| 106 | # if USE_MEMCPY |
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| 107 | memset (htab, 0, sizeof (htab)); |
112 | memset (htab, 0, sizeof (htab)); |
| 108 | # else |
113 | # if 0 |
| 109 | for (hslot = htab; hslot < htab + HSIZE; hslot++) |
114 | for (hslot = htab; hslot < htab + HSIZE; hslot++) |
| 110 | *hslot++ = ip; |
115 | *hslot++ = ip; |
| 111 | # endif |
116 | # endif |
| 112 | #endif |
117 | #endif |
| 113 | |
118 | |
| 114 | for (;;) |
119 | for (;;) |
| 115 | { |
120 | { |
| … | |
… | |
| 211 | { |
216 | { |
| 212 | if (op + 1 + MAX_LIT >= out_end) |
217 | if (op + 1 + MAX_LIT >= out_end) |
| 213 | return 0; |
218 | return 0; |
| 214 | |
219 | |
| 215 | *op++ = MAX_LIT - 1; |
220 | *op++ = MAX_LIT - 1; |
| 216 | #if USE_MEMCPY |
221 | |
| 217 | memcpy (op, ip - MAX_LIT, MAX_LIT); |
222 | #ifdef lzf_movsb |
| 218 | op += MAX_LIT; |
223 | ip -= lit; |
| 219 | lit = 0; |
224 | lzf_movsb (op, ip, lit); |
| 220 | #else |
225 | #else |
| 221 | lit = -lit; |
226 | lit = -lit; |
| 222 | do |
227 | do |
| 223 | *op++ = ip[lit]; |
228 | *op++ = ip[lit]; |
| 224 | while (++lit); |
229 | while (++lit); |
| … | |
… | |
| 230 | { |
235 | { |
| 231 | if (op + lit + 1 >= out_end) |
236 | if (op + lit + 1 >= out_end) |
| 232 | return 0; |
237 | return 0; |
| 233 | |
238 | |
| 234 | *op++ = lit - 1; |
239 | *op++ = lit - 1; |
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240 | #ifdef lzf_movsb |
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241 | ip -= lit; |
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242 | lzf_movsb (op, ip, lit); |
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243 | #else |
| 235 | lit = -lit; |
244 | lit = -lit; |
| 236 | do |
245 | do |
| 237 | *op++ = ip[lit]; |
246 | *op++ = ip[lit]; |
| 238 | while (++lit); |
247 | while (++lit); |
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248 | #endif |
| 239 | } |
249 | } |
| 240 | |
250 | |
| 241 | return op - (u8 *) out_data; |
251 | return op - (u8 *) out_data; |
| 242 | } |
252 | } |
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253 | |
