filter_flags_decoder.c revision 292588 
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