1 // SPDX-License-Identifier: 0BSD
2 
3 ///////////////////////////////////////////////////////////////////////////////
4 //
5 /// \file       stream_flags_common.c
6 /// \brief      Common stuff for Stream flags coders
7 //
8 //  Author:     Lasse Collin
9 //
10 ///////////////////////////////////////////////////////////////////////////////
11 
12 #include "stream_flags_common.h"
13 
14 
15 const uint8_t lzma_header_magic[6] = { 0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00 };
16 const uint8_t lzma_footer_magic[2] = { 0x59, 0x5A };
17 
18 
19 extern LZMA_API(lzma_ret)
20 lzma_stream_flags_compare(
21 		const lzma_stream_flags *a, const lzma_stream_flags *b)
22 {
23 	// We can compare only version 0 structures.
24 	if (a->version != 0 || b->version != 0)
25 		return LZMA_OPTIONS_ERROR;
26 
27 	// Check type
28 	if ((unsigned int)(a->check) > LZMA_CHECK_ID_MAX
29 			|| (unsigned int)(b->check) > LZMA_CHECK_ID_MAX)
30 		return LZMA_PROG_ERROR;
31 
32 	if (a->check != b->check)
33 		return LZMA_DATA_ERROR;
34 
35 	// Backward Sizes are compared only if they are known in both.
36 	if (a->backward_size != LZMA_VLI_UNKNOWN
37 			&& b->backward_size != LZMA_VLI_UNKNOWN) {
38 		if (!is_backward_size_valid(a) || !is_backward_size_valid(b))
39 			return LZMA_PROG_ERROR;
40 
41 		if (a->backward_size != b->backward_size)
42 			return LZMA_DATA_ERROR;
43 	}
44 
45 	return LZMA_OK;
46 }
47