src/liblzma/common/common.c

   1 ///////////////////////////////////////////////////////////////////////////////
   2 //
   3 /// \file       common.h
   4 /// \brief      Common functions needed in many places in liblzma
   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 "common.h"
  14
  15
  16 /////////////
  17 // Version //
  18 /////////////
  19
  20 extern LZMA_API(uint32_t)
  21 lzma_version_number(void)
  22 {
  23         return LZMA_VERSION;
  24 }
  25
  26
  27 extern LZMA_API(const char *)
  28 lzma_version_string(void)
  29 {
  30         return LZMA_VERSION_STRING;
  31 }
  32
  33
  34 ///////////////////////
  35 // Memory allocation //
  36 ///////////////////////
  37
  38 extern void * lzma_attribute((malloc))
  39 lzma_alloc(size_t size, lzma_allocator *allocator)
  40 {
  41         // Some malloc() variants return NULL if called with size == 0.
  42         if (size == 0)
  43                 size = 1;
  44
  45         void *ptr;
  46
  47         if (allocator != NULL && allocator->alloc != NULL)
  48                 ptr = allocator->alloc(allocator->opaque, 1, size);
  49         else
  50                 ptr = malloc(size);
  51
  52         return ptr;
  53 }
  54
  55
  56 extern void
  57 lzma_free(void *ptr, lzma_allocator *allocator)
  58 {
  59         if (allocator != NULL && allocator->free != NULL)
  60                 allocator->free(allocator->opaque, ptr);
  61         else
  62                 free(ptr);
  63
  64         return;
  65 }
  66
  67
  68 //////////
  69 // Misc //
  70 //////////
  71
  72 extern size_t
  73 lzma_bufcpy(const uint8_t *restrict in, size_t *restrict in_pos,
  74                 size_t in_size, uint8_t *restrict out,
  75                 size_t *restrict out_pos, size_t out_size)
  76 {
  77         const size_t in_avail = in_size - *in_pos;
  78         const size_t out_avail = out_size - *out_pos;
  79         const size_t copy_size = my_min(in_avail, out_avail);
  80
  81         memcpy(out + *out_pos, in + *in_pos, copy_size);
  82
  83         *in_pos += copy_size;
  84         *out_pos += copy_size;
  85
  86         return copy_size;
  87 }
  88
  89
  90 extern lzma_ret
  91 lzma_next_filter_init(lzma_next_coder *next, lzma_allocator *allocator,
  92                 const lzma_filter_info *filters)
  93 {
  94         lzma_next_coder_init(filters[0].init, next, allocator);
  95         next->id = filters[0].id;
  96         return filters[0].init == NULL
  97                         ? LZMA_OK : filters[0].init(next, allocator, filters);
  98 }
  99
 100
 101 extern lzma_ret
 102 lzma_next_filter_update(lzma_next_coder *next, lzma_allocator *allocator,
 103                 const lzma_filter *reversed_filters)
 104 {
 105         // Check that the application isn't trying to change the Filter ID.
 106         // End of filters is indicated with LZMA_VLI_UNKNOWN in both
 107         // reversed_filters[0].id and next->id.
 108         if (reversed_filters[0].id != next->id)
 109                 return LZMA_PROG_ERROR;
 110
 111         if (reversed_filters[0].id == LZMA_VLI_UNKNOWN)
 112                 return LZMA_OK;
 113
 114         assert(next->update != NULL);
 115         return next->update(next->coder, allocator, NULL, reversed_filters);
 116 }
 117
 118
 119 extern void
 120 lzma_next_end(lzma_next_coder *next, lzma_allocator *allocator)
 121 {
 122         if (next->init != (uintptr_t)(NULL)) {
 123                 // To avoid tiny end functions that simply call
 124                 // lzma_free(coder, allocator), we allow leaving next->end
 125                 // NULL and call lzma_free() here.
 126                 if (next->end != NULL)
 127                         next->end(next->coder, allocator);
 128                 else
 129                         lzma_free(next->coder, allocator);
 130
 131                 // Reset the variables so the we don't accidentally think
 132                 // that it is an already initialized coder.
 133                 *next = LZMA_NEXT_CODER_INIT;
 134         }
 135
 136         return;
 137 }
 138
 139
 140 //////////////////////////////////////
 141 // External to internal API wrapper //
 142 //////////////////////////////////////
 143
 144 extern lzma_ret
 145 lzma_strm_init(lzma_stream *strm)
 146 {
 147         if (strm == NULL)
 148                 return LZMA_PROG_ERROR;
 149
 150         if (strm->internal == NULL) {
 151                 strm->internal = lzma_alloc(sizeof(lzma_internal),
 152                                 strm->allocator);
 153                 if (strm->internal == NULL)
 154                         return LZMA_MEM_ERROR;
 155
 156                 strm->internal->next = LZMA_NEXT_CODER_INIT;
 157         }
 158
 159         strm->internal->supported_actions[LZMA_RUN] = false;
 160         strm->internal->supported_actions[LZMA_SYNC_FLUSH] = false;
 161         strm->internal->supported_actions[LZMA_FULL_FLUSH] = false;
 162         strm->internal->supported_actions[LZMA_FINISH] = false;
 163         strm->internal->sequence = ISEQ_RUN;
 164         strm->internal->allow_buf_error = false;
 165
 166         strm->total_in = 0;
 167         strm->total_out = 0;
 168
 169         return LZMA_OK;
 170 }
 171
 172
 173 extern LZMA_API(lzma_ret)
 174 lzma_code(lzma_stream *strm, lzma_action action)
 175 {
 176         // Sanity checks
 177         if ((strm->next_in == NULL && strm->avail_in != 0)
 178                         || (strm->next_out == NULL && strm->avail_out != 0)
 179                         || strm->internal == NULL
 180                         || strm->internal->next.code == NULL
 181                         || (unsigned int)(action) > LZMA_FINISH
 182                         || !strm->internal->supported_actions[action])
 183                 return LZMA_PROG_ERROR;
 184
 185         switch (strm->internal->sequence) {
 186         case ISEQ_RUN:
 187                 switch (action) {
 188                 case LZMA_RUN:
 189                         break;
 190
 191                 case LZMA_SYNC_FLUSH:
 192                         strm->internal->sequence = ISEQ_SYNC_FLUSH;
 193                         break;
 194
 195                 case LZMA_FULL_FLUSH:
 196                         strm->internal->sequence = ISEQ_FULL_FLUSH;
 197                         break;
 198
 199                 case LZMA_FINISH:
 200                         strm->internal->sequence = ISEQ_FINISH;
 201                         break;
 202                 }
 203
 204                 break;
 205
 206         case ISEQ_SYNC_FLUSH:
 207                 // The same action must be used until we return
 208                 // LZMA_STREAM_END, and the amount of input must not change.
 209                 if (action != LZMA_SYNC_FLUSH
 210                                 || strm->internal->avail_in != strm->avail_in)
 211                         return LZMA_PROG_ERROR;
 212
 213                 break;
 214
 215         case ISEQ_FULL_FLUSH:
 216                 if (action != LZMA_FULL_FLUSH
 217                                 || strm->internal->avail_in != strm->avail_in)
 218                         return LZMA_PROG_ERROR;
 219
 220                 break;
 221
 222         case ISEQ_FINISH:
 223                 if (action != LZMA_FINISH
 224                                 || strm->internal->avail_in != strm->avail_in)
 225                         return LZMA_PROG_ERROR;
 226
 227                 break;
 228
 229         case ISEQ_END:
 230                 return LZMA_STREAM_END;
 231
 232         case ISEQ_ERROR:
 233         default:
 234                 return LZMA_PROG_ERROR;
 235         }
 236
 237         size_t in_pos = 0;
 238         size_t out_pos = 0;
 239         lzma_ret ret = strm->internal->next.code(
 240                         strm->internal->next.coder, strm->allocator,
 241                         strm->next_in, &in_pos, strm->avail_in,
 242                         strm->next_out, &out_pos, strm->avail_out, action);
 243
 244         strm->next_in += in_pos;
 245         strm->avail_in -= in_pos;
 246         strm->total_in += in_pos;
 247
 248         strm->next_out += out_pos;
 249         strm->avail_out -= out_pos;
 250         strm->total_out += out_pos;
 251
 252         strm->internal->avail_in = strm->avail_in;
 253
 254         switch (ret) {
 255         case LZMA_OK:
 256                 // Don't return LZMA_BUF_ERROR when it happens the first time.
 257                 // This is to avoid returning LZMA_BUF_ERROR when avail_out
 258                 // was zero but still there was no more data left to written
 259                 // to next_out.
 260                 if (out_pos == 0 && in_pos == 0) {
 261                         if (strm->internal->allow_buf_error)
 262                                 ret = LZMA_BUF_ERROR;
 263                         else
 264                                 strm->internal->allow_buf_error = true;
 265                 } else {
 266                         strm->internal->allow_buf_error = false;
 267                 }
 268                 break;
 269
 270         case LZMA_STREAM_END:
 271                 if (strm->internal->sequence == ISEQ_SYNC_FLUSH
 272                                 || strm->internal->sequence == ISEQ_FULL_FLUSH)
 273                         strm->internal->sequence = ISEQ_RUN;
 274                 else
 275                         strm->internal->sequence = ISEQ_END;
 276
 277         // Fall through
 278
 279         case LZMA_NO_CHECK:
 280         case LZMA_UNSUPPORTED_CHECK:
 281         case LZMA_GET_CHECK:
 282         case LZMA_MEMLIMIT_ERROR:
 283                 // Something else than LZMA_OK, but not a fatal error,
 284                 // that is, coding may be continued (except if ISEQ_END).
 285                 strm->internal->allow_buf_error = false;
 286                 break;
 287
 288         default:
 289                 // All the other errors are fatal; coding cannot be continued.
 290                 assert(ret != LZMA_BUF_ERROR);
 291                 strm->internal->sequence = ISEQ_ERROR;
 292                 break;
 293         }
 294
 295         return ret;
 296 }
 297
 298
 299 extern LZMA_API(void)
 300 lzma_end(lzma_stream *strm)
 301 {
 302         if (strm != NULL && strm->internal != NULL) {
 303                 lzma_next_end(&strm->internal->next, strm->allocator);
 304                 lzma_free(strm->internal, strm->allocator);
 305                 strm->internal = NULL;
 306         }
 307
 308         return;
 309 }
 310
 311
 312 extern LZMA_API(lzma_check)
 313 lzma_get_check(const lzma_stream *strm)
 314 {
 315         // Return LZMA_CHECK_NONE if we cannot know the check type.
 316         // It's a bug in the application if this happens.
 317         if (strm->internal->next.get_check == NULL)
 318                 return LZMA_CHECK_NONE;
 319
 320         return strm->internal->next.get_check(strm->internal->next.coder);
 321 }
 322
 323
 324 extern LZMA_API(uint64_t)
 325 lzma_memusage(const lzma_stream *strm)
 326 {
 327         uint64_t memusage;
 328         uint64_t old_memlimit;
 329
 330         if (strm == NULL || strm->internal == NULL
 331                         || strm->internal->next.memconfig == NULL
 332                         || strm->internal->next.memconfig(
 333                                 strm->internal->next.coder,
 334                                 &memusage, &old_memlimit, 0) != LZMA_OK)
 335                 return 0;
 336
 337         return memusage;
 338 }
 339
 340
 341 extern LZMA_API(uint64_t)
 342 lzma_memlimit_get(const lzma_stream *strm)
 343 {
 344         uint64_t old_memlimit;
 345         uint64_t memusage;
 346
 347         if (strm == NULL || strm->internal == NULL
 348                         || strm->internal->next.memconfig == NULL
 349                         || strm->internal->next.memconfig(
 350                                 strm->internal->next.coder,
 351                                 &memusage, &old_memlimit, 0) != LZMA_OK)
 352                 return 0;
 353
 354         return old_memlimit;
 355 }
 356
 357
 358 extern LZMA_API(lzma_ret)
 359 lzma_memlimit_set(lzma_stream *strm, uint64_t new_memlimit)
 360 {
 361         // Dummy variables to simplify memconfig functions
 362         uint64_t old_memlimit;
 363         uint64_t memusage;
 364
 365         if (strm == NULL || strm->internal == NULL
 366                         || strm->internal->next.memconfig == NULL)
 367                 return LZMA_PROG_ERROR;
 368
 369         if (new_memlimit != 0 && new_memlimit < LZMA_MEMUSAGE_BASE)
 370                 return LZMA_MEMLIMIT_ERROR;
 371
 372         return strm->internal->next.memconfig(strm->internal->next.coder,
 373                         &memusage, &old_memlimit, new_memlimit);
 374 }