| 1 | /* |
1 | /* |
| 2 | * Copyright (c) 2000 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- |
| … | |
… | |
| 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 << 4)) >> (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 |
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103 | #if LZF_STATE_ARG |
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104 | , LZF_STATE htab |
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105 | #endif |
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106 | ) |
| 72 | { |
107 | { |
| 73 | const u8 *htab[HSIZE]; |
108 | #if !LZF_STATE_ARG |
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109 | LZF_STATE htab; |
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110 | #endif |
| 74 | const u8 **hslot; |
111 | const u8 **hslot; |
| 75 | const u8 *ip = in_data; |
112 | const u8 *ip = (const u8 *)in_data; |
| 76 | u8 *op = out_data; |
113 | u8 *op = (u8 *)out_data; |
| 77 | const u8 *in_end = ip + in_len; |
114 | const u8 *in_end = ip + in_len; |
| 78 | u8 *out_end = op + out_len; |
115 | u8 *out_end = op + out_len; |
| 79 | const u8 *ref; |
116 | const u8 *ref; |
| 80 | |
117 | |
| 81 | unsigned int hval = FRST (ip); |
118 | unsigned int hval = FRST (ip); |
| 82 | unsigned long off; |
119 | unsigned long off; |
| 83 | int lit = 0; |
120 | int lit = 0; |
| 84 | |
121 | |
| 85 | #if INIT_HTAB |
122 | #if INIT_HTAB |
| 86 | # if USE_MEMCPY |
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| 87 | memset (htab, 0, sizeof (htab)); |
123 | memset (htab, 0, sizeof (htab)); |
| 88 | # else |
124 | # if 0 |
| 89 | for (hslot = htab; hslot < htab + HSIZE; hslot++) |
125 | for (hslot = htab; hslot < htab + HSIZE; hslot++) |
| 90 | *hslot++ = ip; |
126 | *hslot++ = ip; |
| 91 | # endif |
127 | # endif |
| 92 | #endif |
128 | #endif |
| 93 | |
129 | |
| 94 | do |
130 | for (;;) |
| 95 | { |
131 | { |
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132 | if (expect_true (ip < in_end - 2)) |
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133 | { |
| 96 | hval = NEXT (hval, ip); |
134 | hval = NEXT (hval, ip); |
| 97 | hslot = htab + IDX (hval); |
135 | hslot = htab + IDX (hval); |
| 98 | ref = *hslot; *hslot = ip; |
136 | ref = *hslot; *hslot = ip; |
| 99 | |
137 | |
| 100 | if (1 |
138 | if (1 |
| 101 | #if INIT_HTAB && !USE_MEMCPY |
139 | #if INIT_HTAB && !USE_MEMCPY |
| 102 | && ref < ip /* the next test will actually take care of this, but it is faster */ |
140 | && ref < ip /* the next test will actually take care of this, but this is faster */ |
| 103 | #endif |
141 | #endif |
| 104 | && (off = ip - ref - 1) < MAX_OFF |
142 | && (off = ip - ref - 1) < MAX_OFF |
| 105 | && ip + 4 < in_end |
143 | && ip + 4 < in_end |
| 106 | && ref > (u8 *)in_data |
144 | && ref > (u8 *)in_data |
| 107 | #if STRICT_ALIGN |
145 | #if STRICT_ALIGN |
| 108 | && ref[0] == ip[0] |
146 | && ref[0] == ip[0] |
| 109 | && ref[1] == ip[1] |
147 | && ref[1] == ip[1] |
| 110 | && ref[2] == ip[2] |
148 | && ref[2] == ip[2] |
| 111 | #else |
149 | #else |
| 112 | && *(u16 *)ref == *(u16 *)ip |
150 | && *(u16 *)ref == *(u16 *)ip |
| 113 | && ref[2] == ip[2] |
151 | && ref[2] == ip[2] |
| 114 | #endif |
152 | #endif |
| 115 | ) |
153 | ) |
| 116 | { |
154 | { |
| 117 | /* match found at *ref++ */ |
155 | /* match found at *ref++ */ |
| 118 | unsigned int len = 2; |
156 | unsigned int len = 2; |
| 119 | unsigned int maxlen = in_end - ip - len; |
157 | unsigned int maxlen = in_end - ip - len; |
| 120 | maxlen = maxlen > MAX_REF ? MAX_REF : maxlen; |
158 | maxlen = maxlen > MAX_REF ? MAX_REF : maxlen; |
| 121 | |
159 | |
| 122 | do |
160 | if (expect_false (op + lit + 1 + 3 >= out_end)) |
| 123 | len++; |
161 | return 0; |
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162 | |
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163 | if (lit) |
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164 | { |
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165 | *op++ = lit - 1; |
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166 | lit = -lit; |
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167 | do |
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168 | *op++ = ip[lit]; |
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169 | while (++lit); |
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170 | } |
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171 | |
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172 | for (;;) |
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173 | { |
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174 | if (expect_true (ip < in_end - 2 - 8 && maxlen > 8)) |
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175 | { |
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176 | len++; if (ref [len] != ip [len]) break; |
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177 | len++; if (ref [len] != ip [len]) break; |
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178 | len++; if (ref [len] != ip [len]) break; |
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179 | len++; if (ref [len] != ip [len]) break; |
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180 | len++; if (ref [len] != ip [len]) break; |
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181 | len++; if (ref [len] != ip [len]) break; |
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182 | len++; if (ref [len] != ip [len]) break; |
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183 | len++; if (ref [len] != ip [len]) break; |
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184 | } |
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185 | |
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186 | do |
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187 | len++; |
| 124 | while (len < maxlen && ref[len] == ip[len]); |
188 | while (len < maxlen && ref[len] == ip[len]); |
| 125 | |
189 | |
| 126 | if (op + lit + 1 + 3 >= out_end) |
190 | break; |
| 127 | return 0; |
191 | } |
| 128 | |
192 | |
| 129 | if (lit) |
193 | len -= 2; |
| 130 | { |
194 | ip++; |
| 131 | *op++ = lit - 1; |
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| 132 | lit = -lit; |
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| 133 | do |
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| 134 | *op++ = ip[lit]; |
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| 135 | while (++lit); |
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| 136 | } |
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| 137 | |
195 | |
| 138 | len -= 2; |
196 | if (len < 7) |
| 139 | ip++; |
197 | { |
| 140 | |
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| 141 | if (len < 7) |
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| 142 | { |
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| 143 | *op++ = (off >> 8) + (len << 5); |
198 | *op++ = (off >> 8) + (len << 5); |
| 144 | } |
199 | } |
| 145 | else |
200 | else |
| 146 | { |
201 | { |
| 147 | *op++ = (off >> 8) + ( 7 << 5); |
202 | *op++ = (off >> 8) + ( 7 << 5); |
| 148 | *op++ = len - 7; |
203 | *op++ = len - 7; |
| 149 | } |
204 | } |
| 150 | |
205 | |
| 151 | *op++ = off; |
206 | *op++ = off; |
| 152 | |
207 | |
| 153 | #if ULTRA_FAST |
208 | #if ULTRA_FAST || VERY_FAST |
| 154 | ip += len; |
209 | ip += len; |
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210 | #if VERY_FAST && !ULTRA_FAST |
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211 | --ip; |
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212 | #endif |
| 155 | hval = FRST (ip); |
213 | hval = FRST (ip); |
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214 | |
| 156 | hval = NEXT (hval, ip); |
215 | hval = NEXT (hval, ip); |
| 157 | htab[IDX (hval)] = ip; |
216 | htab[IDX (hval)] = ip; |
| 158 | ip++; |
217 | ip++; |
| 159 | #else |
218 | |
| 160 | do |
219 | #if VERY_FAST && !ULTRA_FAST |
| 161 | { |
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| 162 | hval = NEXT (hval, ip); |
220 | hval = NEXT (hval, ip); |
| 163 | htab[IDX (hval)] = ip; |
221 | htab[IDX (hval)] = ip; |
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222 | ip++; |
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223 | #endif |
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224 | #else |
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225 | do |
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226 | { |
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227 | hval = NEXT (hval, ip); |
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228 | htab[IDX (hval)] = ip; |
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229 | ip++; |
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230 | } |
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231 | while (len--); |
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232 | #endif |
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233 | continue; |
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234 | } |
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235 | } |
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236 | else if (expect_false (ip == in_end)) |
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237 | break; |
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238 | |
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239 | /* one more literal byte we must copy */ |
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240 | lit++; |
| 164 | ip++; |
241 | ip++; |
| 165 | } |
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| 166 | while (len--); |
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| 167 | #endif |
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| 168 | } |
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| 169 | else |
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| 170 | { |
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| 171 | /* one more literal byte we must copy */ |
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| 172 | lit++; |
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| 173 | ip++; |
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| 174 | |
242 | |
| 175 | if (lit == MAX_LIT) |
243 | if (expect_false (lit == MAX_LIT)) |
| 176 | { |
244 | { |
| 177 | if (op + 1 + MAX_LIT >= out_end) |
245 | if (op + 1 + MAX_LIT >= out_end) |
| 178 | return 0; |
246 | return 0; |
| 179 | |
247 | |
| 180 | *op++ = MAX_LIT - 1; |
248 | *op++ = MAX_LIT - 1; |
| 181 | #if USE_MEMCPY |
249 | |
| 182 | memcpy (op, ip - MAX_LIT, MAX_LIT); |
250 | #ifdef lzf_movsb |
| 183 | op += MAX_LIT; |
251 | ip -= lit; |
| 184 | lit = 0; |
252 | lzf_movsb (op, ip, lit); |
| 185 | #else |
253 | #else |
| 186 | lit = -lit; |
254 | lit = -lit; |
| 187 | do |
255 | do |
| 188 | *op++ = ip[lit]; |
256 | *op++ = ip[lit]; |
| 189 | while (++lit); |
257 | while (++lit); |
| 190 | #endif |
258 | #endif |
| 191 | } |
259 | } |
| 192 | } |
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| 193 | } |
260 | } |
| 194 | while (ip < in_end); |
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| 195 | |
261 | |
| 196 | if (lit) |
262 | if (lit) |
| 197 | { |
263 | { |
| 198 | if (op + lit + 1 >= out_end) |
264 | if (op + lit + 1 >= out_end) |
| 199 | return 0; |
265 | return 0; |
| 200 | |
266 | |
| 201 | *op++ = lit - 1; |
267 | *op++ = lit - 1; |
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268 | #ifdef lzf_movsb |
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269 | ip -= lit; |
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270 | lzf_movsb (op, ip, lit); |
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271 | #else |
| 202 | lit = -lit; |
272 | lit = -lit; |
| 203 | do |
273 | do |
| 204 | *op++ = ip[lit]; |
274 | *op++ = ip[lit]; |
| 205 | while (++lit); |
275 | while (++lit); |
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276 | #endif |
| 206 | } |
277 | } |
| 207 | |
278 | |
| 208 | return op - (u8 *) out_data; |
279 | return op - (u8 *) out_data; |
| 209 | } |
280 | } |
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281 | |
