1///////////////////////////////////////////////////////////////////////////////
2//
3/// \file       filter_buffer_encoder.c
4/// \brief      Single-call raw encoding
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_encoder.h"
14
15
16extern LZMA_API(lzma_ret)
17lzma_raw_buffer_encode(const lzma_filter *filters, lzma_allocator *allocator,
18		const uint8_t *in, size_t in_size, uint8_t *out,
19		size_t *out_pos, size_t out_size)
20{
21	// Validate what isn't validated later in filter_common.c.
22	if ((in == NULL && in_size != 0) || out == NULL
23			|| out_pos == NULL || *out_pos > out_size)
24		return LZMA_PROG_ERROR;
25
26	// Initialize the encoder
27	lzma_next_coder next = LZMA_NEXT_CODER_INIT;
28	return_if_error(lzma_raw_encoder_init(&next, allocator, filters));
29
30	// Store the output position so that we can restore it if
31	// something goes wrong.
32	const size_t out_start = *out_pos;
33
34	// Do the actual encoding and free coder's memory.
35	size_t in_pos = 0;
36	lzma_ret ret = next.code(next.coder, allocator, in, &in_pos, in_size,
37			out, out_pos, out_size, LZMA_FINISH);
38	lzma_next_end(&next, allocator);
39
40	if (ret == LZMA_STREAM_END) {
41		ret = LZMA_OK;
42	} else {
43		if (ret == LZMA_OK) {
44			// Output buffer was too small.
45			assert(*out_pos == out_size);
46			ret = LZMA_BUF_ERROR;
47		}
48
49		// Restore the output position.
50		*out_pos = out_start;
51	}
52
53	return ret;
54}
55