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- |
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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)) |
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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)) |
53 | //# define IDX(h) ((ip[0] * 121 ^ ip[1] * 33 ^ ip[2] * 1) & (HSIZE-1)) |
51 | /*# define IDX(h) ((ip[0] * 121 ^ ip[1] * 33 ^ ip[2] * 1) & (HSIZE-1))*/ |
54 | #endif |
52 | #endif |
55 | /* |
53 | /* |
56 | * 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. |
57 | * ((h * 57321 >> (3*8 - HLOG)) & (HSIZE - 1)) |
55 | * ((h * 57321 >> (3*8 - HLOG)) & (HSIZE - 1)) |
58 | * the latter is also quite fast on newer CPUs, and compresses similarly. |
56 | * the latter is also quite fast on newer CPUs, and compresses similarly. |
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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 |
74 | |
79 | |
75 | /* |
80 | /* |
76 | * compressed format |
81 | * compressed format |
77 | * |
82 | * |
78 | * 000LLLLL <L+1> ; literal |
83 | * 000LLLLL <L+1> ; literal |
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102 | unsigned int hval = FRST (ip); |
107 | unsigned int hval = FRST (ip); |
103 | unsigned long off; |
108 | unsigned long off; |
104 | int lit = 0; |
109 | int lit = 0; |
105 | |
110 | |
106 | #if INIT_HTAB |
111 | #if INIT_HTAB |
107 | # if USE_MEMCPY |
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108 | memset (htab, 0, sizeof (htab)); |
112 | memset (htab, 0, sizeof (htab)); |
109 | # else |
113 | # if 0 |
110 | for (hslot = htab; hslot < htab + HSIZE; hslot++) |
114 | for (hslot = htab; hslot < htab + HSIZE; hslot++) |
111 | *hslot++ = ip; |
115 | *hslot++ = ip; |
112 | # endif |
116 | # endif |
113 | #endif |
117 | #endif |
114 | |
118 | |
115 | for (;;) |
119 | for (;;) |
116 | { |
120 | { |
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212 | { |
216 | { |
213 | if (op + 1 + MAX_LIT >= out_end) |
217 | if (op + 1 + MAX_LIT >= out_end) |
214 | return 0; |
218 | return 0; |
215 | |
219 | |
216 | *op++ = MAX_LIT - 1; |
220 | *op++ = MAX_LIT - 1; |
217 | #if USE_MEMCPY |
221 | |
218 | memcpy (op, ip - MAX_LIT, MAX_LIT); |
222 | #ifdef lzf_movsb |
219 | op += MAX_LIT; |
223 | ip -= lit; |
220 | lit = 0; |
224 | lzf_movsb (op, ip, lit); |
221 | #else |
225 | #else |
222 | lit = -lit; |
226 | lit = -lit; |
223 | do |
227 | do |
224 | *op++ = ip[lit]; |
228 | *op++ = ip[lit]; |
225 | while (++lit); |
229 | while (++lit); |
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231 | { |
235 | { |
232 | if (op + lit + 1 >= out_end) |
236 | if (op + lit + 1 >= out_end) |
233 | return 0; |
237 | return 0; |
234 | |
238 | |
235 | *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 |
236 | lit = -lit; |
244 | lit = -lit; |
237 | do |
245 | do |
238 | *op++ = ip[lit]; |
246 | *op++ = ip[lit]; |
239 | while (++lit); |
247 | while (++lit); |
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248 | #endif |
240 | } |
249 | } |
241 | |
250 | |
242 | return op - (u8 *) out_data; |
251 | return op - (u8 *) out_data; |
243 | } |
252 | } |
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253 | |