1 // SPDX-License-Identifier: GPL-2.0
2 #include <errno.h>
3 #include <lzma.h>
4 #include <stdio.h>
5 #include <linux/compiler.h>
6 #include "compress.h"
7 #include "util.h"
8 #include "debug.h"
9
10 #define BUFSIZE 8192
11
lzma_strerror(lzma_ret ret)12 static const char *lzma_strerror(lzma_ret ret)
13 {
14 switch ((int) ret) {
15 case LZMA_MEM_ERROR:
16 return "Memory allocation failed";
17 case LZMA_OPTIONS_ERROR:
18 return "Unsupported decompressor flags";
19 case LZMA_FORMAT_ERROR:
20 return "The input is not in the .xz format";
21 case LZMA_DATA_ERROR:
22 return "Compressed file is corrupt";
23 case LZMA_BUF_ERROR:
24 return "Compressed file is truncated or otherwise corrupt";
25 default:
26 return "Unknown error, possibly a bug";
27 }
28 }
29
lzma_decompress_to_file(const char * input,int output_fd)30 int lzma_decompress_to_file(const char *input, int output_fd)
31 {
32 lzma_action action = LZMA_RUN;
33 lzma_stream strm = LZMA_STREAM_INIT;
34 lzma_ret ret;
35 int err = -1;
36
37 u8 buf_in[BUFSIZE];
38 u8 buf_out[BUFSIZE];
39 FILE *infile;
40
41 infile = fopen(input, "rb");
42 if (!infile) {
43 pr_err("lzma: fopen failed on %s: '%s'\n",
44 input, strerror(errno));
45 return -1;
46 }
47
48 ret = lzma_stream_decoder(&strm, UINT64_MAX, LZMA_CONCATENATED);
49 if (ret != LZMA_OK) {
50 pr_err("lzma: lzma_stream_decoder failed %s (%d)\n",
51 lzma_strerror(ret), ret);
52 goto err_fclose;
53 }
54
55 strm.next_in = NULL;
56 strm.avail_in = 0;
57 strm.next_out = buf_out;
58 strm.avail_out = sizeof(buf_out);
59
60 while (1) {
61 if (strm.avail_in == 0 && !feof(infile)) {
62 strm.next_in = buf_in;
63 strm.avail_in = fread(buf_in, 1, sizeof(buf_in), infile);
64
65 if (ferror(infile)) {
66 pr_err("lzma: read error: %s\n", strerror(errno));
67 goto err_fclose;
68 }
69
70 if (feof(infile))
71 action = LZMA_FINISH;
72 }
73
74 ret = lzma_code(&strm, action);
75
76 if (strm.avail_out == 0 || ret == LZMA_STREAM_END) {
77 ssize_t write_size = sizeof(buf_out) - strm.avail_out;
78
79 if (writen(output_fd, buf_out, write_size) != write_size) {
80 pr_err("lzma: write error: %s\n", strerror(errno));
81 goto err_fclose;
82 }
83
84 strm.next_out = buf_out;
85 strm.avail_out = sizeof(buf_out);
86 }
87
88 if (ret != LZMA_OK) {
89 if (ret == LZMA_STREAM_END)
90 break;
91
92 pr_err("lzma: failed %s\n", lzma_strerror(ret));
93 goto err_fclose;
94 }
95 }
96
97 err = 0;
98 err_fclose:
99 fclose(infile);
100 return err;
101 }
102