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[FreeBSD/releng/10.0.git] / contrib / xz / src / liblzma / common / filter_buffer_encoder.c
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
16 extern LZMA_API(lzma_ret)
17 lzma_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 }