| 1 | /* |
1 | /* |
| 2 | * Copyright (c) 2000-2003 Marc Alexander Lehmann <pcg@goof.com> |
2 | * Copyright (c) 2000-2005 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, |
| … | |
… | |
| 22 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
22 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
| 23 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
23 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 24 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
24 | * 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 |
25 | * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| 26 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | * |
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28 | * Alternatively, the contents of this file may be used under the terms of |
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29 | * the GNU General Public License version 2 (the "GPL"), in which case the |
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30 | * provisions of the GPL are applicable instead of the above. If you wish to |
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31 | * allow the use of your version of this file only under the terms of the |
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32 | * GPL and not to allow others to use your version of this file under the |
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33 | * BSD license, indicate your decision by deleting the provisions above and |
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34 | * replace them with the notice and other provisions required by the GPL. If |
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35 | * you do not delete the provisions above, a recipient may use your version |
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36 | * of this file under either the BSD or the GPL. |
| 27 | */ |
37 | */ |
| 28 | |
38 | |
| 29 | #include "lzfP.h" |
39 | #include "lzfP.h" |
| 30 | |
40 | |
| 31 | #define HSIZE (1 << (HLOG)) |
41 | #define HSIZE (1 << (HLOG)) |
| … | |
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| 34 | * don't play with this unless you benchmark! |
44 | * don't play with this unless you benchmark! |
| 35 | * decompression is not dependent on the hash function |
45 | * decompression is not dependent on the hash function |
| 36 | * the hashing function might seem strange, just believe me |
46 | * the hashing function might seem strange, just believe me |
| 37 | * it works ;) |
47 | * it works ;) |
| 38 | */ |
48 | */ |
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49 | #ifndef FRST |
| 39 | #define FRST(p) (((p[0]) << 8) + p[1]) |
50 | # define FRST(p) (((p[0]) << 8) | p[1]) |
| 40 | #define NEXT(v,p) (((v) << 8) + p[2]) |
51 | # define NEXT(v,p) (((v) << 8) | p[2]) |
| 41 | #define IDX(h) ((((h ^ (h << 5)) >> (3*8 - HLOG)) + h*3) & (HSIZE - 1)) |
52 | # define IDX(h) ((((h ^ (h << 5)) >> (3*8 - HLOG)) - h*5) & (HSIZE - 1)) |
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53 | /*# define IDX(h) ((ip[0] * 121 ^ ip[1] * 33 ^ ip[2] * 1) & (HSIZE-1))*/ |
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54 | #endif |
| 42 | /* |
55 | /* |
| 43 | * IDX works because it is very similar to a multiplicative hash, e.g. |
56 | * IDX works because it is very similar to a multiplicative hash, e.g. |
| 44 | * (h * 57321 >> (3*8 - HLOG)) |
57 | * ((h * 57321 >> (3*8 - HLOG)) & (HSIZE - 1)) |
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58 | * the latter is also quite fast on newer CPUs, and compresses similarly. |
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59 | * |
| 45 | * the next one is also quite good, albeit slow ;) |
60 | * the next one is also quite good, albeit slow ;) |
| 46 | * (int)(cos(h & 0xffffff) * 1e6) |
61 | * (int)(cos(h & 0xffffff) * 1e6) |
| 47 | */ |
62 | */ |
| 48 | |
63 | |
| 49 | #if 0 |
64 | #if 0 |
| 50 | /* original lzv-like hash function */ |
65 | /* original lzv-like hash function, much worse and thus slower */ |
| 51 | # define FRST(p) (p[0] << 5) ^ p[1] |
66 | # define FRST(p) (p[0] << 5) ^ p[1] |
| 52 | # define NEXT(v,p) ((v) << 5) ^ p[2] |
67 | # define NEXT(v,p) ((v) << 5) ^ p[2] |
| 53 | # define IDX(h) ((h) & (HSIZE - 1)) |
68 | # define IDX(h) ((h) & (HSIZE - 1)) |
| 54 | #endif |
69 | #endif |
| 55 | |
70 | |
| 56 | #define MAX_LIT (1 << 5) |
71 | #define MAX_LIT (1 << 5) |
| 57 | #define MAX_OFF (1 << 13) |
72 | #define MAX_OFF (1 << 13) |
| 58 | #define MAX_REF ((1 << 8) + (1 << 3)) |
73 | #define MAX_REF ((1 << 8) + (1 << 3)) |
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74 | |
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75 | #if (__i386 || __amd64) && __GNUC__ >= 3 |
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76 | # define lzf_movsb(dst, src, len) \ |
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77 | asm ("rep movsb" \ |
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78 | : "=D" (dst), "=S" (src), "=c" (len) \ |
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79 | : "0" (dst), "1" (src), "2" (len)); |
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80 | #endif |
| 59 | |
81 | |
| 60 | /* |
82 | /* |
| 61 | * compressed format |
83 | * compressed format |
| 62 | * |
84 | * |
| 63 | * 000LLLLL <L+1> ; literal |
85 | * 000LLLLL <L+1> ; literal |
| 64 | * LLLOOOOO oooooooo ; backref L |
86 | * LLLooooo oooooooo ; backref L |
| 65 | * 111OOOOO LLLLLLLL oooooooo ; backref L+7 |
87 | * 111ooooo LLLLLLLL oooooooo ; backref L+7 |
| 66 | * |
88 | * |
| 67 | */ |
89 | */ |
| 68 | |
90 | |
| 69 | unsigned int |
91 | unsigned int |
| 70 | lzf_compress (const void *const in_data, unsigned int in_len, |
92 | lzf_compress (const void *const in_data, unsigned int in_len, |
| 71 | void *out_data, unsigned int out_len |
93 | void *out_data, unsigned int out_len |
| 72 | #if !LZF_STATE_ARG |
94 | #if LZF_STATE_ARG |
| 73 | , LZF_STATE *htab |
95 | , LZF_STATE htab |
| 74 | #endif |
96 | #endif |
| 75 | ) |
97 | ) |
| 76 | { |
98 | { |
| 77 | #if LZF_STATE_ARG |
99 | #if !LZF_STATE_ARG |
| 78 | LZF_STATE htab; |
100 | LZF_STATE htab; |
| 79 | #endif |
101 | #endif |
| 80 | const u8 **hslot; |
102 | const u8 **hslot; |
| 81 | const u8 *ip = (const u8 *)in_data; |
103 | const u8 *ip = (const u8 *)in_data; |
| 82 | u8 *op = (u8 *)out_data; |
104 | u8 *op = (u8 *)out_data; |
| … | |
… | |
| 87 | unsigned int hval = FRST (ip); |
109 | unsigned int hval = FRST (ip); |
| 88 | unsigned long off; |
110 | unsigned long off; |
| 89 | int lit = 0; |
111 | int lit = 0; |
| 90 | |
112 | |
| 91 | #if INIT_HTAB |
113 | #if INIT_HTAB |
| 92 | # if USE_MEMCPY |
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| 93 | memset (htab, 0, sizeof (htab)); |
114 | memset (htab, 0, sizeof (htab)); |
| 94 | # else |
115 | # if 0 |
| 95 | for (hslot = htab; hslot < htab + HSIZE; hslot++) |
116 | for (hslot = htab; hslot < htab + HSIZE; hslot++) |
| 96 | *hslot++ = ip; |
117 | *hslot++ = ip; |
| 97 | # endif |
118 | # endif |
| 98 | #endif |
119 | #endif |
| 99 | |
120 | |
| 100 | do |
121 | for (;;) |
| 101 | { |
122 | { |
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123 | if (ip < in_end - 2) |
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124 | { |
| 102 | hval = NEXT (hval, ip); |
125 | hval = NEXT (hval, ip); |
| 103 | hslot = htab + IDX (hval); |
126 | hslot = htab + IDX (hval); |
| 104 | ref = *hslot; *hslot = ip; |
127 | ref = *hslot; *hslot = ip; |
| 105 | |
128 | |
| 106 | if (1 |
129 | if (1 |
| 107 | #if INIT_HTAB && !USE_MEMCPY |
130 | #if INIT_HTAB && !USE_MEMCPY |
| 108 | && ref < ip /* the next test will actually take care of this, but it is faster */ |
131 | && ref < ip /* the next test will actually take care of this, but this is faster */ |
| 109 | #endif |
132 | #endif |
| 110 | && (off = ip - ref - 1) < MAX_OFF |
133 | && (off = ip - ref - 1) < MAX_OFF |
| 111 | && ip + 4 < in_end |
134 | && ip + 4 < in_end |
| 112 | && ref > (u8 *)in_data |
135 | && ref > (u8 *)in_data |
| 113 | #if STRICT_ALIGN |
136 | #if STRICT_ALIGN |
| 114 | && ref[0] == ip[0] |
137 | && ref[0] == ip[0] |
| 115 | && ref[1] == ip[1] |
138 | && ref[1] == ip[1] |
| 116 | && ref[2] == ip[2] |
139 | && ref[2] == ip[2] |
| 117 | #else |
140 | #else |
| 118 | && *(u16 *)ref == *(u16 *)ip |
141 | && *(u16 *)ref == *(u16 *)ip |
| 119 | && ref[2] == ip[2] |
142 | && ref[2] == ip[2] |
| 120 | #endif |
143 | #endif |
| 121 | ) |
144 | ) |
| 122 | { |
145 | { |
| 123 | /* match found at *ref++ */ |
146 | /* match found at *ref++ */ |
| 124 | unsigned int len = 2; |
147 | unsigned int len = 2; |
| 125 | unsigned int maxlen = in_end - ip - len; |
148 | unsigned int maxlen = in_end - ip - len; |
| 126 | maxlen = maxlen > MAX_REF ? MAX_REF : maxlen; |
149 | maxlen = maxlen > MAX_REF ? MAX_REF : maxlen; |
| 127 | |
150 | |
| 128 | do |
151 | if (op + lit + 1 + 3 >= out_end) |
| 129 | len++; |
152 | return 0; |
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153 | |
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154 | do |
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155 | len++; |
| 130 | while (len < maxlen && ref[len] == ip[len]); |
156 | while (len < maxlen && ref[len] == ip[len]); |
| 131 | |
157 | |
| 132 | if (op + lit + 1 + 3 >= out_end) |
158 | if (lit) |
| 133 | return 0; |
159 | { |
| 134 | |
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| 135 | if (lit) |
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| 136 | { |
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| 137 | *op++ = lit - 1; |
160 | *op++ = lit - 1; |
| 138 | lit = -lit; |
161 | lit = -lit; |
| 139 | do |
162 | do |
| 140 | *op++ = ip[lit]; |
163 | *op++ = ip[lit]; |
| 141 | while (++lit); |
164 | while (++lit); |
| 142 | } |
165 | } |
| 143 | |
166 | |
| 144 | len -= 2; |
167 | len -= 2; |
| 145 | ip++; |
168 | ip++; |
| 146 | |
169 | |
| 147 | if (len < 7) |
170 | if (len < 7) |
| 148 | { |
171 | { |
| 149 | *op++ = (off >> 8) + (len << 5); |
172 | *op++ = (off >> 8) + (len << 5); |
| 150 | } |
173 | } |
| 151 | else |
174 | else |
| 152 | { |
175 | { |
| 153 | *op++ = (off >> 8) + ( 7 << 5); |
176 | *op++ = (off >> 8) + ( 7 << 5); |
| 154 | *op++ = len - 7; |
177 | *op++ = len - 7; |
| 155 | } |
178 | } |
| 156 | |
179 | |
| 157 | *op++ = off; |
180 | *op++ = off; |
| 158 | |
181 | |
| 159 | #if ULTRA_FAST |
182 | #if ULTRA_FAST || VERY_FAST |
| 160 | ip += len; |
183 | ip += len; |
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184 | #if VERY_FAST && !ULTRA_FAST |
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185 | --ip; |
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186 | #endif |
| 161 | hval = FRST (ip); |
187 | hval = FRST (ip); |
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188 | |
| 162 | hval = NEXT (hval, ip); |
189 | hval = NEXT (hval, ip); |
| 163 | htab[IDX (hval)] = ip; |
190 | htab[IDX (hval)] = ip; |
| 164 | ip++; |
191 | ip++; |
| 165 | #else |
192 | |
| 166 | do |
193 | #if VERY_FAST && !ULTRA_FAST |
| 167 | { |
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| 168 | hval = NEXT (hval, ip); |
194 | hval = NEXT (hval, ip); |
| 169 | htab[IDX (hval)] = ip; |
195 | htab[IDX (hval)] = ip; |
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196 | ip++; |
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197 | #endif |
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198 | #else |
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199 | do |
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200 | { |
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201 | hval = NEXT (hval, ip); |
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202 | htab[IDX (hval)] = ip; |
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203 | ip++; |
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204 | } |
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205 | while (len--); |
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206 | #endif |
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207 | continue; |
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208 | } |
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209 | } |
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210 | else if (ip == in_end) |
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211 | break; |
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212 | |
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213 | /* one more literal byte we must copy */ |
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214 | lit++; |
| 170 | ip++; |
215 | ip++; |
| 171 | } |
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| 172 | while (len--); |
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| 173 | #endif |
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| 174 | } |
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| 175 | else |
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| 176 | { |
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| 177 | /* one more literal byte we must copy */ |
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| 178 | lit++; |
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| 179 | ip++; |
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| 180 | |
216 | |
| 181 | if (lit == MAX_LIT) |
217 | if (lit == MAX_LIT) |
| 182 | { |
218 | { |
| 183 | if (op + 1 + MAX_LIT >= out_end) |
219 | if (op + 1 + MAX_LIT >= out_end) |
| 184 | return 0; |
220 | return 0; |
| 185 | |
221 | |
| 186 | *op++ = MAX_LIT - 1; |
222 | *op++ = MAX_LIT - 1; |
| 187 | #if USE_MEMCPY |
223 | |
| 188 | memcpy (op, ip - MAX_LIT, MAX_LIT); |
224 | #ifdef lzf_movsb |
| 189 | op += MAX_LIT; |
225 | ip -= lit; |
| 190 | lit = 0; |
226 | lzf_movsb (op, ip, lit); |
| 191 | #else |
227 | #else |
| 192 | lit = -lit; |
228 | lit = -lit; |
| 193 | do |
229 | do |
| 194 | *op++ = ip[lit]; |
230 | *op++ = ip[lit]; |
| 195 | while (++lit); |
231 | while (++lit); |
| 196 | #endif |
232 | #endif |
| 197 | } |
233 | } |
| 198 | } |
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| 199 | } |
234 | } |
| 200 | while (ip < in_end); |
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| 201 | |
235 | |
| 202 | if (lit) |
236 | if (lit) |
| 203 | { |
237 | { |
| 204 | if (op + lit + 1 >= out_end) |
238 | if (op + lit + 1 >= out_end) |
| 205 | return 0; |
239 | return 0; |
| 206 | |
240 | |
| 207 | *op++ = lit - 1; |
241 | *op++ = lit - 1; |
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242 | #ifdef lzf_movsb |
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243 | ip -= lit; |
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244 | lzf_movsb (op, ip, lit); |
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245 | #else |
| 208 | lit = -lit; |
246 | lit = -lit; |
| 209 | do |
247 | do |
| 210 | *op++ = ip[lit]; |
248 | *op++ = ip[lit]; |
| 211 | while (++lit); |
249 | while (++lit); |
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250 | #endif |
| 212 | } |
251 | } |
| 213 | |
252 | |
| 214 | return op - (u8 *) out_data; |
253 | return op - (u8 *) out_data; |
| 215 | } |
254 | } |
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255 | |
