11341Sstevel/////////////////////////////////////////////////////////////////////////////// 21341Sstevel// 31341Sstevel/// \file block_buffer_decoder.c 41341Sstevel/// \brief Single-call .xz Block decoder 51341Sstevel// 61341Sstevel// Author: Lasse Collin 71341Sstevel// 81341Sstevel// This file has been put into the public domain. 91341Sstevel// You can do whatever you want with this file. 101341Sstevel// 111341Sstevel/////////////////////////////////////////////////////////////////////////////// 121341Sstevel 131341Sstevel#include "block_decoder.h" 141341Sstevel 151341Sstevel 161341Sstevelextern LZMA_API(lzma_ret) 171341Sstevellzma_block_buffer_decode(lzma_block *block, const lzma_allocator *allocator, 181341Sstevel const uint8_t *in, size_t *in_pos, size_t in_size, 191341Sstevel uint8_t *out, size_t *out_pos, size_t out_size) 201341Sstevel{ 211341Sstevel if (in_pos == NULL || (in == NULL && *in_pos != in_size) 221341Sstevel || *in_pos > in_size || out_pos == NULL 231341Sstevel || (out == NULL && *out_pos != out_size) 241341Sstevel || *out_pos > out_size) 251341Sstevel return LZMA_PROG_ERROR; 261341Sstevel 271341Sstevel // Initialize the Block decoder. 281341Sstevel lzma_next_coder block_decoder = LZMA_NEXT_CODER_INIT; 291341Sstevel lzma_ret ret = lzma_block_decoder_init( 301341Sstevel &block_decoder, allocator, block); 311341Sstevel 321341Sstevel if (ret == LZMA_OK) { 331341Sstevel // Save the positions so that we can restore them in case 341341Sstevel // an error occurs. 351341Sstevel const size_t in_start = *in_pos; 361341Sstevel const size_t out_start = *out_pos; 371341Sstevel 381341Sstevel // Do the actual decoding. 391341Sstevel ret = block_decoder.code(block_decoder.coder, allocator, 401341Sstevel in, in_pos, in_size, out, out_pos, out_size, 411341Sstevel LZMA_FINISH); 421341Sstevel 431341Sstevel if (ret == LZMA_STREAM_END) { 441341Sstevel ret = LZMA_OK; 451341Sstevel } else { 461341Sstevel if (ret == LZMA_OK) { 471341Sstevel // Either the input was truncated or the 481341Sstevel // output buffer was too small. 491341Sstevel assert(*in_pos == in_size 501341Sstevel || *out_pos == out_size); 511341Sstevel 521341Sstevel // If all the input was consumed, then the 531341Sstevel // input is truncated, even if the output 541341Sstevel // buffer is also full. This is because 551341Sstevel // processing the last byte of the Block 561341Sstevel // never produces output. 571341Sstevel // 581341Sstevel // NOTE: This assumption may break when new 591341Sstevel // filters are added, if the end marker of 601341Sstevel // the filter doesn't consume at least one 611341Sstevel // complete byte. 621341Sstevel if (*in_pos == in_size) 631341Sstevel ret = LZMA_DATA_ERROR; 641341Sstevel else 651341Sstevel ret = LZMA_BUF_ERROR; 661341Sstevel } 671341Sstevel 681341Sstevel // Restore the positions. 691341Sstevel *in_pos = in_start; 701341Sstevel *out_pos = out_start; 711341Sstevel } 721341Sstevel } 731341Sstevel 741341Sstevel // Free the decoder memory. This needs to be done even if 751341Sstevel // initialization fails, because the internal API doesn't 761341Sstevel // require the initialization function to free its memory on error. 771341Sstevel lzma_next_end(&block_decoder, allocator); 781341Sstevel 791341Sstevel return ret; 801341Sstevel} 811341Sstevel