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
16 extern LZMA_API(lzma_ret)
lzma_filter_flags_decode(lzma_filter * filter,const lzma_allocator * allocator,const uint8_t * in,size_t * in_pos,size_t in_size)17 lzma_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