1207753Smm/////////////////////////////////////////////////////////////////////////////// 2207753Smm// 3207753Smm/// \file block_buffer_decoder.c 4207753Smm/// \brief Single-call .xz Block decoder 5207753Smm// 6207753Smm// Author: Lasse Collin 7207753Smm// 8207753Smm// This file has been put into the public domain. 9207753Smm// You can do whatever you want with this file. 10207753Smm// 11207753Smm/////////////////////////////////////////////////////////////////////////////// 12207753Smm 13207753Smm#include "block_decoder.h" 14207753Smm 15207753Smm 16207753Smmextern LZMA_API(lzma_ret) 17207753Smmlzma_block_buffer_decode(lzma_block *block, lzma_allocator *allocator, 18207753Smm const uint8_t *in, size_t *in_pos, size_t in_size, 19207753Smm uint8_t *out, size_t *out_pos, size_t out_size) 20207753Smm{ 21207753Smm if (in_pos == NULL || (in == NULL && *in_pos != in_size) 22207753Smm || *in_pos > in_size || out_pos == NULL 23207753Smm || (out == NULL && *out_pos != out_size) 24207753Smm || *out_pos > out_size) 25207753Smm return LZMA_PROG_ERROR; 26207753Smm 27207753Smm // Initialize the Block decoder. 28207753Smm lzma_next_coder block_decoder = LZMA_NEXT_CODER_INIT; 29207753Smm lzma_ret ret = lzma_block_decoder_init( 30207753Smm &block_decoder, allocator, block); 31207753Smm 32207753Smm if (ret == LZMA_OK) { 33207753Smm // Save the positions so that we can restore them in case 34207753Smm // an error occurs. 35207753Smm const size_t in_start = *in_pos; 36207753Smm const size_t out_start = *out_pos; 37207753Smm 38207753Smm // Do the actual decoding. 39207753Smm ret = block_decoder.code(block_decoder.coder, allocator, 40207753Smm in, in_pos, in_size, out, out_pos, out_size, 41207753Smm LZMA_FINISH); 42207753Smm 43207753Smm if (ret == LZMA_STREAM_END) { 44207753Smm ret = LZMA_OK; 45207753Smm } else { 46207753Smm if (ret == LZMA_OK) { 47207753Smm // Either the input was truncated or the 48207753Smm // output buffer was too small. 49207753Smm assert(*in_pos == in_size 50207753Smm || *out_pos == out_size); 51207753Smm 52207753Smm // If all the input was consumed, then the 53207753Smm // input is truncated, even if the output 54207753Smm // buffer is also full. This is because 55207753Smm // processing the last byte of the Block 56207753Smm // never produces output. 57207753Smm // 58207753Smm // NOTE: This assumption may break when new 59207753Smm // filters are added, if the end marker of 60207753Smm // the filter doesn't consume at least one 61207753Smm // complete byte. 62207753Smm if (*in_pos == in_size) 63207753Smm ret = LZMA_DATA_ERROR; 64207753Smm else 65207753Smm ret = LZMA_BUF_ERROR; 66207753Smm } 67207753Smm 68207753Smm // Restore the positions. 69207753Smm *in_pos = in_start; 70207753Smm *out_pos = out_start; 71207753Smm } 72207753Smm } 73207753Smm 74207753Smm // Free the decoder memory. This needs to be done even if 75207753Smm // initialization fails, because the internal API doesn't 76207753Smm // require the initialization function to free its memory on error. 77207753Smm lzma_next_end(&block_decoder, allocator); 78207753Smm 79207753Smm return ret; 80207753Smm} 81