1///////////////////////////////////////////////////////////////////////////////
2//
3/// \file       stream_flags_common.c
4/// \brief      Common stuff for Stream flags coders
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 "stream_flags_common.h"
14
15
16const uint8_t lzma_header_magic[6] = { 0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00 };
17const uint8_t lzma_footer_magic[2] = { 0x59, 0x5A };
18
19
20extern LZMA_API(lzma_ret)
21lzma_stream_flags_compare(
22		const lzma_stream_flags *a, const lzma_stream_flags *b)
23{
24	// We can compare only version 0 structures.
25	if (a->version != 0 || b->version != 0)
26		return LZMA_OPTIONS_ERROR;
27
28	// Check type
29	if ((unsigned int)(a->check) > LZMA_CHECK_ID_MAX
30			|| (unsigned int)(b->check) > LZMA_CHECK_ID_MAX)
31		return LZMA_PROG_ERROR;
32
33	if (a->check != b->check)
34		return LZMA_DATA_ERROR;
35
36	// Backward Sizes are compared only if they are known in both.
37	if (a->backward_size != LZMA_VLI_UNKNOWN
38			&& b->backward_size != LZMA_VLI_UNKNOWN) {
39		if (!is_backward_size_valid(a) || !is_backward_size_valid(b))
40			return LZMA_PROG_ERROR;
41
42		if (a->backward_size != b->backward_size)
43			return LZMA_DATA_ERROR;
44	}
45
46	return LZMA_OK;
47}
48