1#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}

  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 <sys/types.h>
  7#include <sys/stat.h>
  8#include <fcntl.h>
  9#include "compress.h"
 10#include "debug.h"
 11#include <string.h>
 12#include <unistd.h>
 13#include <internal/lib.h>
 14
 15#define BUFSIZE 8192
 16
 17static const char *lzma_strerror(lzma_ret ret)
 18{
 19	switch ((int) ret) {
 20	case LZMA_MEM_ERROR:
 21		return "Memory allocation failed";
 22	case LZMA_OPTIONS_ERROR:
 23		return "Unsupported decompressor flags";
 24	case LZMA_FORMAT_ERROR:
 25		return "The input is not in the .xz format";
 26	case LZMA_DATA_ERROR:
 27		return "Compressed file is corrupt";
 28	case LZMA_BUF_ERROR:
 29		return "Compressed file is truncated or otherwise corrupt";
 30	default:
 31		return "Unknown error, possibly a bug";
 32	}
 33}
 34
 35int lzma_decompress_to_file(const char *input, int output_fd)
 36{
 37	lzma_action action = LZMA_RUN;
 38	lzma_stream strm   = LZMA_STREAM_INIT;
 39	lzma_ret ret;
 40	int err = -1;
 41
 42	u8 buf_in[BUFSIZE];
 43	u8 buf_out[BUFSIZE];
 44	FILE *infile;
 45
 46	infile = fopen(input, "rb");
 47	if (!infile) {
 48		pr_err("lzma: fopen failed on %s: '%s'\n",
 49		       input, strerror(errno));
 50		return -1;
 51	}
 52
 53	ret = lzma_stream_decoder(&strm, UINT64_MAX, LZMA_CONCATENATED);
 54	if (ret != LZMA_OK) {
 55		pr_err("lzma: lzma_stream_decoder failed %s (%d)\n",
 56			lzma_strerror(ret), ret);
 57		goto err_fclose;
 58	}
 59
 60	strm.next_in   = NULL;
 61	strm.avail_in  = 0;
 62	strm.next_out  = buf_out;
 63	strm.avail_out = sizeof(buf_out);
 64
 65	while (1) {
 66		if (strm.avail_in == 0 && !feof(infile)) {
 67			strm.next_in  = buf_in;
 68			strm.avail_in = fread(buf_in, 1, sizeof(buf_in), infile);
 69
 70			if (ferror(infile)) {
 71				pr_err("lzma: read error: %s\n", strerror(errno));
 72				goto err_lzma_end;
 73			}
 74
 75			if (feof(infile))
 76				action = LZMA_FINISH;
 77		}
 78
 79		ret = lzma_code(&strm, action);
 80
 81		if (strm.avail_out == 0 || ret == LZMA_STREAM_END) {
 82			ssize_t write_size = sizeof(buf_out) - strm.avail_out;
 83
 84			if (writen(output_fd, buf_out, write_size) != write_size) {
 85				pr_err("lzma: write error: %s\n", strerror(errno));
 86				goto err_lzma_end;
 87			}
 88
 89			strm.next_out  = buf_out;
 90			strm.avail_out = sizeof(buf_out);
 91		}
 92
 93		if (ret != LZMA_OK) {
 94			if (ret == LZMA_STREAM_END)
 95				break;
 96
 97			pr_err("lzma: failed %s\n", lzma_strerror(ret));
 98			goto err_lzma_end;
 99		}
100	}
101
102	err = 0;
103err_lzma_end:
104	lzma_end(&strm);
105err_fclose:
106	fclose(infile);
107	return err;
108}
109
110bool lzma_is_compressed(const char *input)
111{
112	int fd = open(input, O_RDONLY);
113	const uint8_t magic[6] = { 0xFD, '7', 'z', 'X', 'Z', 0x00 };
114	char buf[6] = { 0 };
115	ssize_t rc;
116
117	if (fd < 0)
118		return -1;
119
120	rc = read(fd, buf, sizeof(buf));
121	close(fd);
122	return rc == sizeof(buf) ?
123	       memcmp(buf, magic, sizeof(buf)) == 0 : false;
124}