1 ///////////////////////////////////////////////////////////////////////////////
2 //
3 /// \file       simple_encoder.c
4 /// \brief      Properties encoder for simple filters
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 "simple_encoder.h"
14 
15 
16 extern lzma_ret
17 lzma_simple_props_size(uint32_t *size, const void *options)
18 {
19 	const lzma_options_bcj *const opt = options;
20 	*size = (opt == NULL || opt->start_offset == 0) ? 0 : 4;
21 	return LZMA_OK;
22 }
23 
24 
25 extern lzma_ret
26 lzma_simple_props_encode(const void *options, uint8_t *out)
27 {
28 	const lzma_options_bcj *const opt = options;
29 
30 	// The default start offset is zero, so we don't need to store any
31 	// options unless the start offset is non-zero.
32 	if (opt == NULL || opt->start_offset == 0)
33 		return LZMA_OK;
34 
35 	write32le(out, opt->start_offset);
36 
37 	return LZMA_OK;
38 }
39