1 /////////////////////////////////////////////////////////////////////////////// 2 // 3 /// \file filter_decoder.c 4 /// \brief Filter ID mapping to filter-specific functions 5 // 6 // Author: Lasse Collin 7 // 8 // This file has been put into the public domain. 9 // You can do whatever you want with this file. 10 // 11 /////////////////////////////////////////////////////////////////////////////// 12 13 #include "filter_encoder.h" 14 #include "filter_common.h" 15 #include "lzma_encoder.h" 16 #include "lzma2_encoder.h" 17 #include "simple_encoder.h" 18 #include "delta_encoder.h" 19 20 21 typedef struct { 22 /// Filter ID 23 lzma_vli id; 24 25 /// Initializes the filter encoder and calls lzma_next_filter_init() 26 /// for filters + 1. 27 lzma_init_function init; 28 29 /// Calculates memory usage of the encoder. If the options are 30 /// invalid, UINT64_MAX is returned. 31 uint64_t (*memusage)(const void *options); 32 33 /// Calculates the recommended Uncompressed Size for .xz Blocks to 34 /// which the input data can be split to make multithreaded 35 /// encoding possible. If this is NULL, it is assumed that 36 /// the encoder is fast enough with single thread. 37 uint64_t (*block_size)(const void *options); 38 39 /// Tells the size of the Filter Properties field. If options are 40 /// invalid, LZMA_OPTIONS_ERROR is returned and size is set to 41 /// UINT32_MAX. 42 lzma_ret (*props_size_get)(uint32_t *size, const void *options); 43 44 /// Some filters will always have the same size Filter Properties 45 /// field. If props_size_get is NULL, this value is used. 46 uint32_t props_size_fixed; 47 48 /// Encodes Filter Properties. 49 /// 50 /// \return - LZMA_OK: Properties encoded successfully. 51 /// - LZMA_OPTIONS_ERROR: Unsupported options 52 /// - LZMA_PROG_ERROR: Invalid options or not enough 53 /// output space 54 lzma_ret (*props_encode)(const void *options, uint8_t *out); 55 56 } lzma_filter_encoder; 57 58 59 static const lzma_filter_encoder encoders[] = { 60 #ifdef HAVE_ENCODER_LZMA1 61 { 62 .id = LZMA_FILTER_LZMA1, 63 .init = &lzma_lzma_encoder_init, 64 .memusage = &lzma_lzma_encoder_memusage, 65 .block_size = NULL, // Not needed for LZMA1 66 .props_size_get = NULL, 67 .props_size_fixed = 5, 68 .props_encode = &lzma_lzma_props_encode, 69 }, 70 { 71 .id = LZMA_FILTER_LZMA1EXT, 72 .init = &lzma_lzma_encoder_init, 73 .memusage = &lzma_lzma_encoder_memusage, 74 .block_size = NULL, // Not needed for LZMA1 75 .props_size_get = NULL, 76 .props_size_fixed = 5, 77 .props_encode = &lzma_lzma_props_encode, 78 }, 79 #endif 80 #ifdef HAVE_ENCODER_LZMA2 81 { 82 .id = LZMA_FILTER_LZMA2, 83 .init = &lzma_lzma2_encoder_init, 84 .memusage = &lzma_lzma2_encoder_memusage, 85 .block_size = &lzma_lzma2_block_size, 86 .props_size_get = NULL, 87 .props_size_fixed = 1, 88 .props_encode = &lzma_lzma2_props_encode, 89 }, 90 #endif 91 #ifdef HAVE_ENCODER_X86 92 { 93 .id = LZMA_FILTER_X86, 94 .init = &lzma_simple_x86_encoder_init, 95 .memusage = NULL, 96 .block_size = NULL, 97 .props_size_get = &lzma_simple_props_size, 98 .props_encode = &lzma_simple_props_encode, 99 }, 100 #endif 101 #ifdef HAVE_ENCODER_POWERPC 102 { 103 .id = LZMA_FILTER_POWERPC, 104 .init = &lzma_simple_powerpc_encoder_init, 105 .memusage = NULL, 106 .block_size = NULL, 107 .props_size_get = &lzma_simple_props_size, 108 .props_encode = &lzma_simple_props_encode, 109 }, 110 #endif 111 #ifdef HAVE_ENCODER_IA64 112 { 113 .id = LZMA_FILTER_IA64, 114 .init = &lzma_simple_ia64_encoder_init, 115 .memusage = NULL, 116 .block_size = NULL, 117 .props_size_get = &lzma_simple_props_size, 118 .props_encode = &lzma_simple_props_encode, 119 }, 120 #endif 121 #ifdef HAVE_ENCODER_ARM 122 { 123 .id = LZMA_FILTER_ARM, 124 .init = &lzma_simple_arm_encoder_init, 125 .memusage = NULL, 126 .block_size = NULL, 127 .props_size_get = &lzma_simple_props_size, 128 .props_encode = &lzma_simple_props_encode, 129 }, 130 #endif 131 #ifdef HAVE_ENCODER_ARMTHUMB 132 { 133 .id = LZMA_FILTER_ARMTHUMB, 134 .init = &lzma_simple_armthumb_encoder_init, 135 .memusage = NULL, 136 .block_size = NULL, 137 .props_size_get = &lzma_simple_props_size, 138 .props_encode = &lzma_simple_props_encode, 139 }, 140 #endif 141 #ifdef HAVE_ENCODER_ARM64 142 { 143 .id = LZMA_FILTER_ARM64, 144 .init = &lzma_simple_arm64_encoder_init, 145 .memusage = NULL, 146 .block_size = NULL, 147 .props_size_get = &lzma_simple_props_size, 148 .props_encode = &lzma_simple_props_encode, 149 }, 150 #endif 151 #ifdef HAVE_ENCODER_SPARC 152 { 153 .id = LZMA_FILTER_SPARC, 154 .init = &lzma_simple_sparc_encoder_init, 155 .memusage = NULL, 156 .block_size = NULL, 157 .props_size_get = &lzma_simple_props_size, 158 .props_encode = &lzma_simple_props_encode, 159 }, 160 #endif 161 #ifdef HAVE_ENCODER_DELTA 162 { 163 .id = LZMA_FILTER_DELTA, 164 .init = &lzma_delta_encoder_init, 165 .memusage = &lzma_delta_coder_memusage, 166 .block_size = NULL, 167 .props_size_get = NULL, 168 .props_size_fixed = 1, 169 .props_encode = &lzma_delta_props_encode, 170 }, 171 #endif 172 }; 173 174 175 static const lzma_filter_encoder * 176 encoder_find(lzma_vli id) 177 { 178 for (size_t i = 0; i < ARRAY_SIZE(encoders); ++i) 179 if (encoders[i].id == id) 180 return encoders + i; 181 182 return NULL; 183 } 184 185 186 extern LZMA_API(lzma_bool) 187 lzma_filter_encoder_is_supported(lzma_vli id) 188 { 189 return encoder_find(id) != NULL; 190 } 191 192 193 extern LZMA_API(lzma_ret) 194 lzma_filters_update(lzma_stream *strm, const lzma_filter *filters) 195 { 196 if (strm->internal->next.update == NULL) 197 return LZMA_PROG_ERROR; 198 199 // Validate the filter chain. 200 if (lzma_raw_encoder_memusage(filters) == UINT64_MAX) 201 return LZMA_OPTIONS_ERROR; 202 203 // The actual filter chain in the encoder is reversed. Some things 204 // still want the normal order chain, so we provide both. 205 size_t count = 1; 206 while (filters[count].id != LZMA_VLI_UNKNOWN) 207 ++count; 208 209 lzma_filter reversed_filters[LZMA_FILTERS_MAX + 1]; 210 for (size_t i = 0; i < count; ++i) 211 reversed_filters[count - i - 1] = filters[i]; 212 213 reversed_filters[count].id = LZMA_VLI_UNKNOWN; 214 215 return strm->internal->next.update(strm->internal->next.coder, 216 strm->allocator, filters, reversed_filters); 217 } 218 219 220 extern lzma_ret 221 lzma_raw_encoder_init(lzma_next_coder *next, const lzma_allocator *allocator, 222 const lzma_filter *options) 223 { 224 return lzma_raw_coder_init(next, allocator, 225 options, (lzma_filter_find)(&encoder_find), true); 226 } 227 228 229 extern LZMA_API(lzma_ret) 230 lzma_raw_encoder(lzma_stream *strm, const lzma_filter *options) 231 { 232 lzma_next_strm_init(lzma_raw_coder_init, strm, options, 233 (lzma_filter_find)(&encoder_find), true); 234 235 strm->internal->supported_actions[LZMA_RUN] = true; 236 strm->internal->supported_actions[LZMA_SYNC_FLUSH] = true; 237 strm->internal->supported_actions[LZMA_FINISH] = true; 238 239 return LZMA_OK; 240 } 241 242 243 extern LZMA_API(uint64_t) 244 lzma_raw_encoder_memusage(const lzma_filter *filters) 245 { 246 return lzma_raw_coder_memusage( 247 (lzma_filter_find)(&encoder_find), filters); 248 } 249 250 251 extern uint64_t 252 lzma_mt_block_size(const lzma_filter *filters) 253 { 254 uint64_t max = 0; 255 256 for (size_t i = 0; filters[i].id != LZMA_VLI_UNKNOWN; ++i) { 257 const lzma_filter_encoder *const fe 258 = encoder_find(filters[i].id); 259 if (fe->block_size != NULL) { 260 const uint64_t size 261 = fe->block_size(filters[i].options); 262 if (size == 0) 263 return 0; 264 265 if (size > max) 266 max = size; 267 } 268 } 269 270 return max; 271 } 272 273 274 extern LZMA_API(lzma_ret) 275 lzma_properties_size(uint32_t *size, const lzma_filter *filter) 276 { 277 const lzma_filter_encoder *const fe = encoder_find(filter->id); 278 if (fe == NULL) { 279 // Unknown filter - if the Filter ID is a proper VLI, 280 // return LZMA_OPTIONS_ERROR instead of LZMA_PROG_ERROR, 281 // because it's possible that we just don't have support 282 // compiled in for the requested filter. 283 return filter->id <= LZMA_VLI_MAX 284 ? LZMA_OPTIONS_ERROR : LZMA_PROG_ERROR; 285 } 286 287 if (fe->props_size_get == NULL) { 288 // No props_size_get() function, use props_size_fixed. 289 *size = fe->props_size_fixed; 290 return LZMA_OK; 291 } 292 293 return fe->props_size_get(size, filter->options); 294 } 295 296 297 extern LZMA_API(lzma_ret) 298 lzma_properties_encode(const lzma_filter *filter, uint8_t *props) 299 { 300 const lzma_filter_encoder *const fe = encoder_find(filter->id); 301 if (fe == NULL) 302 return LZMA_PROG_ERROR; 303 304 if (fe->props_encode == NULL) 305 return LZMA_OK; 306 307 return fe->props_encode(filter->options, props); 308 } 309