1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534
|
/* Lzlib - A compression library for lzip files
Copyright (C) 2009, 2010 Antonio Diaz Diaz.
This library is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this library. If not, see <http://www.gnu.org/licenses/>.
As a special exception, you may use this file as part of a free
software library without restriction. Specifically, if other files
instantiate templates or use macros or inline functions from this
file, or you compile this file and link it with other files to
produce an executable, this file does not by itself cause the
resulting executable to be covered by the GNU General Public
License. This exception does not however invalidate any other
reasons why the executable file might be covered by the GNU General
Public License.
*/
#include <algorithm>
#include <cstring>
#include <stdint.h>
#include "lzlib.h"
#include "lzip.h"
#include "decoder.h"
#include "encoder.h"
struct LZ_Encoder
{
long long partial_in_size;
long long partial_out_size;
Matchfinder * matchfinder;
LZ_encoder * lz_encoder;
LZ_Errno lz_errno;
int flush_pending;
const File_header member_header;
bool fatal;
LZ_Encoder( const File_header & header ) throw()
:
partial_in_size( 0 ),
partial_out_size( 0 ),
matchfinder( 0 ),
lz_encoder( 0 ),
lz_errno( LZ_ok ),
flush_pending( 0 ),
member_header( header ),
fatal( false )
{}
};
bool verify_encoder( LZ_Encoder * const encoder )
{
if( !encoder ) return false;
if( !encoder->matchfinder || !encoder->lz_encoder )
{ encoder->lz_errno = LZ_bad_argument; return false; }
return true;
}
struct LZ_Decoder
{
long long partial_in_size;
long long partial_out_size;
Range_decoder * rdec;
LZ_decoder * lz_decoder;
LZ_Errno lz_errno;
File_header member_header; // header of current member
bool fatal;
bool seeking;
LZ_Decoder() throw()
:
partial_in_size( 0 ),
partial_out_size( 0 ),
rdec( 0 ),
lz_decoder( 0 ),
lz_errno( LZ_ok ),
fatal( false ),
seeking( false )
{
for( int i = 0; i < File_header::size; ++i ) member_header.data[i] = 0;
}
};
bool verify_decoder( struct LZ_Decoder * const decoder )
{
if( !decoder ) return false;
if( !decoder->rdec )
{ decoder->lz_errno = LZ_bad_argument; return false; }
return true;
}
const char * LZ_version() { return LZ_version_string; }
const char * LZ_strerror( const LZ_Errno lz_errno )
{
switch( lz_errno )
{
case LZ_ok : return "ok";
case LZ_bad_argument : return "bad argument";
case LZ_mem_error : return "not enough memory";
case LZ_sequence_error: return "sequence error";
case LZ_header_error : return "header error";
case LZ_unexpected_eof: return "unexpected eof";
case LZ_data_error : return "data error";
case LZ_library_error : return "library error";
}
return "invalid error code";
}
int LZ_min_dictionary_bits() { return min_dictionary_bits; }
int LZ_min_dictionary_size() { return min_dictionary_size; }
int LZ_max_dictionary_bits() { return max_dictionary_bits; }
int LZ_max_dictionary_size() { return max_dictionary_size; }
int LZ_min_match_len_limit() { return min_match_len_limit; }
int LZ_max_match_len_limit() { return max_match_len; }
/*---------------------- Compression Functions ----------------------*/
LZ_Encoder * LZ_compress_open( const int dictionary_size,
const int match_len_limit,
const long long member_size )
{
File_header header;
header.set_magic();
const bool error = ( !header.dictionary_size( dictionary_size ) ||
match_len_limit < min_match_len_limit ||
match_len_limit > max_match_len );
LZ_Encoder * encoder = new( std::nothrow ) LZ_Encoder( header );
if( !encoder ) return 0;
LZ_Encoder & e = *encoder;
if( error ) e.lz_errno = LZ_bad_argument;
else
{
try {
e.matchfinder = new Matchfinder( header.dictionary_size(), match_len_limit );
}
catch( std::bad_alloc ) { e.matchfinder = 0; }
if( e.matchfinder )
{
try {
e.lz_encoder = new LZ_encoder( *e.matchfinder, header, member_size );
}
catch( std::bad_alloc )
{
delete e.matchfinder;
e.matchfinder = 0;
e.lz_encoder = 0;
}
}
if( !e.lz_encoder ) e.lz_errno = LZ_mem_error;
}
if( e.lz_errno != LZ_ok ) e.fatal = true;
return encoder;
}
int LZ_compress_close( LZ_Encoder * const encoder )
{
if( !encoder ) return -1;
if( encoder->lz_encoder ) delete encoder->lz_encoder;
if( encoder->matchfinder ) delete encoder->matchfinder;
delete encoder;
return 0;
}
int LZ_compress_finish( LZ_Encoder * const encoder )
{
if( !verify_encoder( encoder ) || encoder->fatal ) return -1;
encoder->matchfinder->flushing( true );
encoder->flush_pending = 0;
return 0;
}
int LZ_compress_restart_member( LZ_Encoder * const encoder,
const long long member_size )
{
if( !verify_encoder( encoder ) || encoder->fatal ) return -1;
LZ_Encoder & e = *encoder;
if( !e.lz_encoder->member_finished() )
{ e.lz_errno = LZ_sequence_error; return -1; }
e.partial_in_size += e.matchfinder->data_position();
e.partial_out_size += e.lz_encoder->member_position();
e.matchfinder->reset();
delete e.lz_encoder;
try {
e.lz_encoder = new LZ_encoder( *e.matchfinder, e.member_header, member_size );
}
catch( std::bad_alloc )
{ e.lz_encoder = 0; e.lz_errno = LZ_mem_error; e.fatal = true; return -1; }
e.lz_errno = LZ_ok;
return 0;
}
int LZ_compress_sync_flush( LZ_Encoder * const encoder )
{
if( !verify_encoder( encoder ) || encoder->fatal ) return -1;
LZ_Encoder & e = *encoder;
if( !e.flush_pending && !e.matchfinder->at_stream_end() )
{
e.flush_pending = 2; // 2 consecutive markers guarantee decoding
e.matchfinder->flushing( true );
if( !e.lz_encoder->encode_member( false ) )
{ e.lz_errno = LZ_library_error; e.fatal = true; return -1; }
while( e.flush_pending > 0 && e.lz_encoder->sync_flush() )
{ if( --e.flush_pending <= 0 ) e.matchfinder->flushing( false ); }
}
return 0;
}
int LZ_compress_read( LZ_Encoder * const encoder,
uint8_t * const buffer, const int size )
{
if( !verify_encoder( encoder ) || encoder->fatal ) return -1;
LZ_Encoder & e = *encoder;
if( !e.lz_encoder->encode_member( !e.flush_pending ) )
{ e.lz_errno = LZ_library_error; e.fatal = true; return -1; }
while( e.flush_pending > 0 && e.lz_encoder->sync_flush() )
{ if( --e.flush_pending <= 0 ) e.matchfinder->flushing( false ); }
return e.lz_encoder->read_data( buffer, size );
}
int LZ_compress_write( LZ_Encoder * const encoder,
const uint8_t * const buffer, const int size )
{
if( !verify_encoder( encoder ) || encoder->fatal ) return -1;
if( encoder->flush_pending ) return 0;
return encoder->matchfinder->write_data( buffer, size );
}
int LZ_compress_write_size( LZ_Encoder * const encoder )
{
if( !verify_encoder( encoder ) || encoder->fatal ) return -1;
if( encoder->flush_pending ) return 0;
return encoder->matchfinder->free_bytes();
}
LZ_Errno LZ_compress_errno( LZ_Encoder * const encoder )
{
if( !encoder ) return LZ_bad_argument;
return encoder->lz_errno;
}
int LZ_compress_finished( LZ_Encoder * const encoder )
{
if( !verify_encoder( encoder ) ) return -1;
return ( !encoder->flush_pending && encoder->matchfinder->finished() &&
encoder->lz_encoder->member_finished() );
}
int LZ_compress_member_finished( LZ_Encoder * const encoder )
{
if( !verify_encoder( encoder ) ) return -1;
return encoder->lz_encoder->member_finished();
}
long long LZ_compress_data_position( LZ_Encoder * const encoder )
{
if( !verify_encoder( encoder ) ) return -1;
return encoder->matchfinder->data_position();
}
long long LZ_compress_member_position( LZ_Encoder * const encoder )
{
if( !verify_encoder( encoder ) ) return -1;
return encoder->lz_encoder->member_position();
}
long long LZ_compress_total_in_size( LZ_Encoder * const encoder )
{
if( !verify_encoder( encoder ) ) return -1;
return encoder->partial_in_size + encoder->matchfinder->data_position();
}
long long LZ_compress_total_out_size( LZ_Encoder * const encoder )
{
if( !verify_encoder( encoder ) ) return -1;
return encoder->partial_out_size + encoder->lz_encoder->member_position();
}
/*--------------------- Decompression Functions ---------------------*/
struct LZ_Decoder * LZ_decompress_open()
{
LZ_Decoder * decoder = new( std::nothrow ) LZ_Decoder;
if( !decoder ) return 0;
LZ_Decoder & d = *decoder;
try { d.rdec = new Range_decoder; }
catch( std::bad_alloc )
{ d.rdec = 0; d.lz_errno = LZ_mem_error; d.fatal = true; }
return decoder;
}
int LZ_decompress_close( struct LZ_Decoder * const decoder )
{
if( !decoder ) return -1;
if( decoder->lz_decoder ) delete decoder->lz_decoder;
if( decoder->rdec ) delete decoder->rdec;
delete decoder;
return 0;
}
int LZ_decompress_finish( struct LZ_Decoder * const decoder )
{
if( !verify_decoder( decoder ) || decoder->fatal ) return -1;
LZ_Decoder & d = *decoder;
if( d.seeking ) { d.seeking = false; d.rdec->purge(); }
else d.rdec->finish();
return 0;
}
int LZ_decompress_reset( struct LZ_Decoder * const decoder )
{
if( !verify_decoder( decoder ) ) return -1;
LZ_Decoder & d = *decoder;
if( d.lz_decoder ) { delete d.lz_decoder; d.lz_decoder = 0; }
d.partial_in_size = 0;
d.partial_out_size = 0;
d.rdec->reset();
d.lz_errno = LZ_ok;
d.fatal = false;
d.seeking = false;
return 0;
}
int LZ_decompress_sync_to_member( struct LZ_Decoder * const decoder )
{
if( !verify_decoder( decoder ) ) return -1;
LZ_Decoder & d = *decoder;
if( d.lz_decoder ) { delete d.lz_decoder; d.lz_decoder = 0; }
if( d.rdec->find_header() ) d.seeking = false;
else
{
if( !d.rdec->at_stream_end() ) d.seeking = true;
else { d.seeking = false; d.rdec->purge(); }
}
d.lz_errno = LZ_ok;
d.fatal = false;
return 0;
}
int LZ_decompress_read( struct LZ_Decoder * const decoder,
uint8_t * const buffer, const int size )
{
if( !verify_decoder( decoder ) || decoder->fatal ) return -1;
LZ_Decoder & d = *decoder;
if( d.seeking ) return 0;
if( d.lz_decoder && d.lz_decoder->member_finished() )
{
d.partial_in_size += d.lz_decoder->member_position();
d.partial_out_size += d.lz_decoder->data_position();
delete d.lz_decoder;
d.lz_decoder = 0;
}
if( !d.lz_decoder )
{
if( d.rdec->used_bytes() < 5 + File_header::size )
{
if( !d.rdec->at_stream_end() || d.rdec->finished() ) return 0;
d.rdec->purge(); // remove trailing garbage
d.lz_errno = LZ_header_error;
d.fatal = true;
return -1;
}
if( !d.rdec->read_header( d.member_header ) )
{
d.lz_errno = LZ_header_error;
d.fatal = true;
return -1;
}
try { d.lz_decoder = new LZ_decoder( d.member_header, *d.rdec ); }
catch( std::bad_alloc ) // not enough free memory
{
d.lz_decoder = 0;
d.lz_errno = LZ_mem_error;
d.fatal = true;
return -1;
}
}
const int result = d.lz_decoder->decode_member();
if( result != 0 )
{
if( result == 2 ) d.lz_errno = LZ_unexpected_eof;
else d.lz_errno = LZ_data_error;
d.fatal = true;
return -1;
}
return d.lz_decoder->read_data( buffer, size );
}
int LZ_decompress_write( struct LZ_Decoder * const decoder,
const uint8_t * const buffer, const int size )
{
if( !verify_decoder( decoder ) || decoder->fatal ) return -1;
LZ_Decoder & d = *decoder;
int result = d.rdec->write_data( buffer, size );
while( d.seeking )
{
if( d.rdec->find_header() ) d.seeking = false;
if( result >= size ) break;
const int size2 = d.rdec->write_data( buffer + result, size - result );
if( size2 > 0 ) result += size2;
else break;
}
return result;
}
int LZ_decompress_write_size( struct LZ_Decoder * const decoder )
{
if( !verify_decoder( decoder ) || decoder->fatal ) return -1;
return decoder->rdec->free_bytes();
}
LZ_Errno LZ_decompress_errno( struct LZ_Decoder * const decoder )
{
if( !decoder ) return LZ_bad_argument;
return decoder->lz_errno;
}
int LZ_decompress_finished( struct LZ_Decoder * const decoder )
{
if( !verify_decoder( decoder ) ) return -1;
return ( decoder->rdec->finished() &&
( !decoder->lz_decoder || decoder->lz_decoder->member_finished() ) );
}
int LZ_decompress_member_finished( struct LZ_Decoder * const decoder )
{
if( !verify_decoder( decoder ) ) return -1;
return ( decoder->lz_decoder && decoder->lz_decoder->member_finished() );
}
int LZ_decompress_member_version( struct LZ_Decoder * const decoder )
{
if( !verify_decoder( decoder ) ) return -1;
return decoder->member_header.version();
}
int LZ_decompress_dictionary_size( struct LZ_Decoder * const decoder )
{
if( !verify_decoder( decoder ) ) return -1;
return decoder->member_header.dictionary_size();
}
unsigned int LZ_decompress_data_crc( struct LZ_Decoder * const decoder )
{
if( verify_decoder( decoder ) && decoder->lz_decoder )
return decoder->lz_decoder->crc();
else return 0;
}
long long LZ_decompress_data_position( struct LZ_Decoder * const decoder )
{
if( !verify_decoder( decoder ) ) return -1;
if( decoder->lz_decoder )
return decoder->lz_decoder->data_position();
else return 0;
}
long long LZ_decompress_member_position( struct LZ_Decoder * const decoder )
{
if( !verify_decoder( decoder ) ) return -1;
if( decoder->lz_decoder )
return decoder->lz_decoder->member_position();
else return 0;
}
long long LZ_decompress_total_in_size( struct LZ_Decoder * const decoder )
{
if( !verify_decoder( decoder ) ) return -1;
if( decoder->lz_decoder )
return decoder->partial_in_size + decoder->lz_decoder->member_position();
return decoder->partial_in_size;
}
long long LZ_decompress_total_out_size( struct LZ_Decoder * const decoder )
{
if( !verify_decoder( decoder ) ) return -1;
if( decoder->lz_decoder )
return decoder->partial_out_size + decoder->lz_decoder->data_position();
return decoder->partial_out_size;
}
|