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- |
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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)) |
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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 << 5)) >> (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 (expect_false (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 (expect_false (++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 (maxlen > 16)) |
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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 | len++; if (ref [len] != ip [len]) break; |
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185 | len++; if (ref [len] != ip [len]) break; |
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186 | len++; if (ref [len] != ip [len]) break; |
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187 | len++; if (ref [len] != ip [len]) break; |
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188 | len++; if (ref [len] != ip [len]) break; |
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189 | len++; if (ref [len] != ip [len]) break; |
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190 | len++; if (ref [len] != ip [len]) break; |
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191 | len++; if (ref [len] != ip [len]) break; |
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192 | } |
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193 | |
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194 | do |
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195 | len++; |
124 | while (len < maxlen && ref[len] == ip[len]); |
196 | while (len < maxlen && ref[len] == ip[len]); |
125 | |
197 | |
126 | if (op + lit + 1 + 3 >= out_end) |
198 | break; |
127 | return 0; |
199 | } |
128 | |
200 | |
129 | if (lit) |
201 | len -= 2; |
130 | { |
202 | 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 | |
203 | |
138 | len -= 2; |
204 | if (len < 7) |
139 | ip++; |
205 | { |
140 | |
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141 | if (len < 7) |
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142 | { |
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143 | *op++ = (off >> 8) + (len << 5); |
206 | *op++ = (off >> 8) + (len << 5); |
144 | } |
207 | } |
145 | else |
208 | else |
146 | { |
209 | { |
147 | *op++ = (off >> 8) + ( 7 << 5); |
210 | *op++ = (off >> 8) + ( 7 << 5); |
148 | *op++ = len - 7; |
211 | *op++ = len - 7; |
149 | } |
212 | } |
150 | |
213 | |
151 | *op++ = off; |
214 | *op++ = off; |
152 | |
215 | |
153 | #if ULTRA_FAST |
216 | #if ULTRA_FAST || VERY_FAST |
154 | ip += len; |
217 | ip += len; |
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218 | #if VERY_FAST && !ULTRA_FAST |
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219 | --ip; |
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220 | #endif |
155 | hval = FRST (ip); |
221 | hval = FRST (ip); |
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222 | |
156 | hval = NEXT (hval, ip); |
223 | hval = NEXT (hval, ip); |
157 | htab[IDX (hval)] = ip; |
224 | htab[IDX (hval)] = ip; |
158 | ip++; |
225 | ip++; |
159 | #else |
226 | |
160 | do |
227 | #if VERY_FAST && !ULTRA_FAST |
161 | { |
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162 | hval = NEXT (hval, ip); |
228 | hval = NEXT (hval, ip); |
163 | htab[IDX (hval)] = ip; |
229 | htab[IDX (hval)] = ip; |
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230 | ip++; |
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231 | #endif |
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232 | #else |
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233 | do |
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234 | { |
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235 | hval = NEXT (hval, ip); |
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236 | htab[IDX (hval)] = ip; |
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237 | ip++; |
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238 | } |
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239 | while (len--); |
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240 | #endif |
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241 | continue; |
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242 | } |
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243 | } |
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244 | else if (expect_false (ip == in_end)) |
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245 | break; |
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246 | |
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247 | /* one more literal byte we must copy */ |
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248 | lit++; |
164 | ip++; |
249 | 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 | |
250 | |
175 | if (lit == MAX_LIT) |
251 | if (expect_false (lit == MAX_LIT)) |
176 | { |
252 | { |
177 | if (op + 1 + MAX_LIT >= out_end) |
253 | if (op + 1 + MAX_LIT >= out_end) |
178 | return 0; |
254 | return 0; |
179 | |
255 | |
180 | *op++ = MAX_LIT - 1; |
256 | *op++ = MAX_LIT - 1; |
181 | #if USE_MEMCPY |
257 | |
182 | memcpy (op, ip - MAX_LIT, MAX_LIT); |
258 | #ifdef lzf_movsb |
183 | op += MAX_LIT; |
259 | ip -= MAX_LIT; |
184 | lit = 0; |
260 | lzf_movsb (op, ip, lit); |
185 | #else |
261 | #else |
186 | lit = -lit; |
262 | lit = -lit; |
187 | do |
263 | do |
188 | *op++ = ip[lit]; |
264 | *op++ = ip[lit]; |
189 | while (++lit); |
265 | while (++lit); |
190 | #endif |
266 | #endif |
191 | } |
267 | } |
192 | } |
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193 | } |
268 | } |
194 | while (ip < in_end); |
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195 | |
269 | |
196 | if (lit) |
270 | if (lit) |
197 | { |
271 | { |
198 | if (op + lit + 1 >= out_end) |
272 | if (op + lit + 1 >= out_end) |
199 | return 0; |
273 | return 0; |
200 | |
274 | |
201 | *op++ = lit - 1; |
275 | *op++ = lit - 1; |
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276 | #ifdef lzf_movsb |
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277 | ip -= lit; |
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278 | lzf_movsb (op, ip, lit); |
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279 | #else |
202 | lit = -lit; |
280 | lit = -lit; |
203 | do |
281 | do |
204 | *op++ = ip[lit]; |
282 | *op++ = ip[lit]; |
205 | while (++lit); |
283 | while (++lit); |
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284 | #endif |
206 | } |
285 | } |
207 | |
286 | |
208 | return op - (u8 *) out_data; |
287 | return op - (u8 *) out_data; |
209 | } |
288 | } |
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289 | |