blob: 95a1acb61245983660ff0f2e0423c7403f80c4f4 [file] [log] [blame]
Jiri Olsa80a32e5b2015-01-29 13:29:39 +01001#include <lzma.h>
2#include <stdio.h>
3#include <linux/compiler.h>
4#include "util.h"
5#include "debug.h"
6
7#define BUFSIZE 8192
8
9static const char *lzma_strerror(lzma_ret ret)
10{
11 switch ((int) ret) {
12 case LZMA_MEM_ERROR:
13 return "Memory allocation failed";
14 case LZMA_OPTIONS_ERROR:
15 return "Unsupported decompressor flags";
16 case LZMA_FORMAT_ERROR:
17 return "The input is not in the .xz format";
18 case LZMA_DATA_ERROR:
19 return "Compressed file is corrupt";
20 case LZMA_BUF_ERROR:
21 return "Compressed file is truncated or otherwise corrupt";
22 default:
23 return "Unknown error, possibly a bug";
24 }
25}
26
27int lzma_decompress_to_file(const char *input, int output_fd)
28{
29 lzma_action action = LZMA_RUN;
30 lzma_stream strm = LZMA_STREAM_INIT;
31 lzma_ret ret;
32
33 u8 buf_in[BUFSIZE];
34 u8 buf_out[BUFSIZE];
35 FILE *infile;
36
37 infile = fopen(input, "rb");
38 if (!infile) {
39 pr_err("lzma: fopen failed on %s: '%s'\n",
40 input, strerror(errno));
41 return -1;
42 }
43
44 ret = lzma_stream_decoder(&strm, UINT64_MAX, LZMA_CONCATENATED);
45 if (ret != LZMA_OK) {
46 pr_err("lzma: lzma_stream_decoder failed %s (%d)\n",
47 lzma_strerror(ret), ret);
48 return -1;
49 }
50
51 strm.next_in = NULL;
52 strm.avail_in = 0;
53 strm.next_out = buf_out;
54 strm.avail_out = sizeof(buf_out);
55
56 while (1) {
57 if (strm.avail_in == 0 && !feof(infile)) {
58 strm.next_in = buf_in;
59 strm.avail_in = fread(buf_in, 1, sizeof(buf_in), infile);
60
61 if (ferror(infile)) {
62 pr_err("lzma: read error: %s\n", strerror(errno));
63 return -1;
64 }
65
66 if (feof(infile))
67 action = LZMA_FINISH;
68 }
69
70 ret = lzma_code(&strm, action);
71
72 if (strm.avail_out == 0 || ret == LZMA_STREAM_END) {
73 ssize_t write_size = sizeof(buf_out) - strm.avail_out;
74
75 if (writen(output_fd, buf_out, write_size) != write_size) {
76 pr_err("lzma: write error: %s\n", strerror(errno));
77 return -1;
78 }
79
80 strm.next_out = buf_out;
81 strm.avail_out = sizeof(buf_out);
82 }
83
84 if (ret != LZMA_OK) {
85 if (ret == LZMA_STREAM_END)
86 return 0;
87
88 pr_err("lzma: failed %s\n", lzma_strerror(ret));
89 return -1;
90 }
91 }
92
93 fclose(infile);
94 return 0;
95}