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47 | * Size of hashtable is (1 << HLOG) * sizeof (char *) |
47 | * Size of hashtable is (1 << HLOG) * sizeof (char *) |
48 | * decompression is independent of the hash table size |
48 | * decompression is independent of the hash table size |
49 | * the difference between 15 and 14 is very small |
49 | * the difference between 15 and 14 is very small |
50 | * for small blocks (and 14 is usually a bit faster). |
50 | * for small blocks (and 14 is usually a bit faster). |
51 | * For a low-memory/faster configuration, use HLOG == 13; |
51 | * For a low-memory/faster configuration, use HLOG == 13; |
52 | * For best compression, use 15 or 16 (or more, up to 23). |
52 | * For best compression, use 15 or 16 (or more, up to 22). |
53 | */ |
53 | */ |
54 | #ifndef HLOG |
54 | #ifndef HLOG |
55 | # define HLOG 16 |
55 | # define HLOG 16 |
56 | #endif |
56 | #endif |
57 | |
57 | |
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86 | * You may choose to pre-set the hash table (might be faster on some |
86 | * You may choose to pre-set the hash table (might be faster on some |
87 | * modern cpus and large (>>64k) blocks, and also makes compression |
87 | * modern cpus and large (>>64k) blocks, and also makes compression |
88 | * deterministic/repeatable when the configuration otherwise is the same). |
88 | * deterministic/repeatable when the configuration otherwise is the same). |
89 | */ |
89 | */ |
90 | #ifndef INIT_HTAB |
90 | #ifndef INIT_HTAB |
91 | # define INIT_HTAB 0 |
91 | # define INIT_HTAB 1 |
92 | #endif |
92 | #endif |
93 | |
93 | |
94 | /* |
94 | /* |
95 | * Avoid assigning values to errno variable? for some embedding purposes |
95 | * Avoid assigning values to errno variable? for some embedding purposes |
96 | * (linux kernel for example), this is necessary. NOTE: this breaks |
96 | * (linux kernel for example), this is necessary. NOTE: this breaks |
… | |
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119 | */ |
119 | */ |
120 | #ifndef CHECK_INPUT |
120 | #ifndef CHECK_INPUT |
121 | # define CHECK_INPUT 1 |
121 | # define CHECK_INPUT 1 |
122 | #endif |
122 | #endif |
123 | |
123 | |
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124 | /* |
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125 | * Whether the target CPU has a slow multiplication. This affects |
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126 | * the default hash function for the compressor, and enables a slightly |
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127 | * worse hash function that needs only shifts. |
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128 | */ |
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129 | #ifndef MULTIPLICATION_IS_SLOW |
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130 | # define MULTIPLICATION_IS_SLOW 0 |
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131 | #endif |
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132 | |
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133 | /* |
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134 | * If defined, then this data type will be used for storing offsets. |
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135 | * This can be useful if you want to use a huge hashtable, want to |
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136 | * conserve memory, or both, and your data fits into e.g. 64kb. |
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137 | * If instead you want to compress data > 4GB, then it's better to |
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138 | * to "#define LZF_USE_OFFSETS 0" instead. |
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139 | */ |
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140 | /*#define LZF_HSLOT unsigned short*/ |
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141 | |
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142 | /* |
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143 | * Whether to store pointers or offsets inside the hash table. On |
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144 | * 64 bit architetcures, pointers take up twice as much space, |
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145 | * and might also be slower. Default is to autodetect. |
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146 | */ |
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147 | /*#define LZF_USE_OFFSETS autodetect */ |
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148 | |
124 | /*****************************************************************************/ |
149 | /*****************************************************************************/ |
125 | /* nothing should be changed below */ |
150 | /* nothing should be changed below */ |
126 | |
151 | |
127 | #ifdef __cplusplus |
152 | #ifdef __cplusplus |
128 | # include <cstring> |
153 | # include <cstring> |
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154 | # include <climits> |
129 | using namespace std; |
155 | using namespace std; |
130 | #else |
156 | #else |
131 | # include <string.h> |
157 | # include <string.h> |
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158 | # include <limits.h> |
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159 | #endif |
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160 | |
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161 | #ifndef LZF_USE_OFFSETS |
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162 | # if defined (WIN32) || defined (_WIN32) |
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163 | # define LZF_USE_OFFSETS defined(_M_X64) |
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164 | # else |
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165 | # if __cplusplus > 199711L |
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166 | # include <cstdint> |
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167 | # else |
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168 | # include <stdint.h> |
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169 | # endif |
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170 | # define LZF_USE_OFFSETS (UINTPTR_MAX > 0xffffffffU) |
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171 | # endif |
132 | #endif |
172 | #endif |
133 | |
173 | |
134 | typedef unsigned char u8; |
174 | typedef unsigned char u8; |
135 | |
175 | |
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176 | #ifdef LZF_HSLOT |
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177 | # define LZF_HSLOT_BIAS ((const u8 *)in_data) |
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178 | #else |
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179 | # if LZF_USE_OFFSETS |
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180 | # define LZF_HSLOT_BIAS ((const u8 *)in_data) |
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181 | typedef unsigned int LZF_HSLOT; |
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182 | # else |
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183 | # define LZF_HSLOT_BIAS 0 |
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184 | typedef const u8 *LZF_HSLOT; |
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185 | # endif |
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186 | #endif |
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187 | |
136 | typedef const u8 *LZF_STATE[1 << (HLOG)]; |
188 | typedef LZF_HSLOT LZF_STATE[1 << (HLOG)]; |
137 | |
189 | |
138 | #if !STRICT_ALIGN |
190 | #if !STRICT_ALIGN |
139 | /* for unaligned accesses we need a 16 bit datatype. */ |
191 | /* for unaligned accesses we need a 16 bit datatype. */ |
140 | # ifdef __cplusplus |
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141 | # include <climits> |
|
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142 | # else |
|
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143 | # include <limits.h> |
|
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144 | # endif |
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145 | # if USHRT_MAX == 65535 |
192 | # if USHRT_MAX == 65535 |
146 | typedef unsigned short u16; |
193 | typedef unsigned short u16; |
147 | # elif UINT_MAX == 65535 |
194 | # elif UINT_MAX == 65535 |
148 | typedef unsigned int u16; |
195 | typedef unsigned int u16; |
149 | # else |
196 | # else |