1/////////////////////////////////////////////////////////////////////////////// 2// 3/// \file filter_flags_decoder.c 4/// \brief Decodes a Filter Flags field 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_decoder.h" 14 15 16extern LZMA_API(lzma_ret) 17lzma_filter_flags_decode( 18 lzma_filter *filter, const lzma_allocator *allocator, 19 const uint8_t *in, size_t *in_pos, size_t in_size) 20{ 21 // Set the pointer to NULL so the caller can always safely free it. 22 filter->options = NULL; 23 24 // Filter ID 25 return_if_error(lzma_vli_decode(&filter->id, NULL, 26 in, in_pos, in_size)); 27 28 if (filter->id >= LZMA_FILTER_RESERVED_START) 29 return LZMA_DATA_ERROR; 30 31 // Size of Properties 32 lzma_vli props_size; 33 return_if_error(lzma_vli_decode(&props_size, NULL, 34 in, in_pos, in_size)); 35 36 // Filter Properties 37 if (in_size - *in_pos < props_size) 38 return LZMA_DATA_ERROR; 39 40 const lzma_ret ret = lzma_properties_decode( 41 filter, allocator, in + *in_pos, props_size); 42 43 *in_pos += props_size; 44 45 return ret; 46} 47