1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #include <errno.h>
3*4882a593Smuzhiyun #include <lzma.h>
4*4882a593Smuzhiyun #include <stdio.h>
5*4882a593Smuzhiyun #include <linux/compiler.h>
6*4882a593Smuzhiyun #include <sys/types.h>
7*4882a593Smuzhiyun #include <sys/stat.h>
8*4882a593Smuzhiyun #include <fcntl.h>
9*4882a593Smuzhiyun #include "compress.h"
10*4882a593Smuzhiyun #include "debug.h"
11*4882a593Smuzhiyun #include <string.h>
12*4882a593Smuzhiyun #include <unistd.h>
13*4882a593Smuzhiyun #include <internal/lib.h>
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun #define BUFSIZE 8192
16*4882a593Smuzhiyun
lzma_strerror(lzma_ret ret)17*4882a593Smuzhiyun static const char *lzma_strerror(lzma_ret ret)
18*4882a593Smuzhiyun {
19*4882a593Smuzhiyun switch ((int) ret) {
20*4882a593Smuzhiyun case LZMA_MEM_ERROR:
21*4882a593Smuzhiyun return "Memory allocation failed";
22*4882a593Smuzhiyun case LZMA_OPTIONS_ERROR:
23*4882a593Smuzhiyun return "Unsupported decompressor flags";
24*4882a593Smuzhiyun case LZMA_FORMAT_ERROR:
25*4882a593Smuzhiyun return "The input is not in the .xz format";
26*4882a593Smuzhiyun case LZMA_DATA_ERROR:
27*4882a593Smuzhiyun return "Compressed file is corrupt";
28*4882a593Smuzhiyun case LZMA_BUF_ERROR:
29*4882a593Smuzhiyun return "Compressed file is truncated or otherwise corrupt";
30*4882a593Smuzhiyun default:
31*4882a593Smuzhiyun return "Unknown error, possibly a bug";
32*4882a593Smuzhiyun }
33*4882a593Smuzhiyun }
34*4882a593Smuzhiyun
lzma_decompress_to_file(const char * input,int output_fd)35*4882a593Smuzhiyun int lzma_decompress_to_file(const char *input, int output_fd)
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun lzma_action action = LZMA_RUN;
38*4882a593Smuzhiyun lzma_stream strm = LZMA_STREAM_INIT;
39*4882a593Smuzhiyun lzma_ret ret;
40*4882a593Smuzhiyun int err = -1;
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun u8 buf_in[BUFSIZE];
43*4882a593Smuzhiyun u8 buf_out[BUFSIZE];
44*4882a593Smuzhiyun FILE *infile;
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun infile = fopen(input, "rb");
47*4882a593Smuzhiyun if (!infile) {
48*4882a593Smuzhiyun pr_err("lzma: fopen failed on %s: '%s'\n",
49*4882a593Smuzhiyun input, strerror(errno));
50*4882a593Smuzhiyun return -1;
51*4882a593Smuzhiyun }
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun ret = lzma_stream_decoder(&strm, UINT64_MAX, LZMA_CONCATENATED);
54*4882a593Smuzhiyun if (ret != LZMA_OK) {
55*4882a593Smuzhiyun pr_err("lzma: lzma_stream_decoder failed %s (%d)\n",
56*4882a593Smuzhiyun lzma_strerror(ret), ret);
57*4882a593Smuzhiyun goto err_fclose;
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun strm.next_in = NULL;
61*4882a593Smuzhiyun strm.avail_in = 0;
62*4882a593Smuzhiyun strm.next_out = buf_out;
63*4882a593Smuzhiyun strm.avail_out = sizeof(buf_out);
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun while (1) {
66*4882a593Smuzhiyun if (strm.avail_in == 0 && !feof(infile)) {
67*4882a593Smuzhiyun strm.next_in = buf_in;
68*4882a593Smuzhiyun strm.avail_in = fread(buf_in, 1, sizeof(buf_in), infile);
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun if (ferror(infile)) {
71*4882a593Smuzhiyun pr_err("lzma: read error: %s\n", strerror(errno));
72*4882a593Smuzhiyun goto err_lzma_end;
73*4882a593Smuzhiyun }
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun if (feof(infile))
76*4882a593Smuzhiyun action = LZMA_FINISH;
77*4882a593Smuzhiyun }
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun ret = lzma_code(&strm, action);
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun if (strm.avail_out == 0 || ret == LZMA_STREAM_END) {
82*4882a593Smuzhiyun ssize_t write_size = sizeof(buf_out) - strm.avail_out;
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun if (writen(output_fd, buf_out, write_size) != write_size) {
85*4882a593Smuzhiyun pr_err("lzma: write error: %s\n", strerror(errno));
86*4882a593Smuzhiyun goto err_lzma_end;
87*4882a593Smuzhiyun }
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun strm.next_out = buf_out;
90*4882a593Smuzhiyun strm.avail_out = sizeof(buf_out);
91*4882a593Smuzhiyun }
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun if (ret != LZMA_OK) {
94*4882a593Smuzhiyun if (ret == LZMA_STREAM_END)
95*4882a593Smuzhiyun break;
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun pr_err("lzma: failed %s\n", lzma_strerror(ret));
98*4882a593Smuzhiyun goto err_lzma_end;
99*4882a593Smuzhiyun }
100*4882a593Smuzhiyun }
101*4882a593Smuzhiyun
102*4882a593Smuzhiyun err = 0;
103*4882a593Smuzhiyun err_lzma_end:
104*4882a593Smuzhiyun lzma_end(&strm);
105*4882a593Smuzhiyun err_fclose:
106*4882a593Smuzhiyun fclose(infile);
107*4882a593Smuzhiyun return err;
108*4882a593Smuzhiyun }
109*4882a593Smuzhiyun
lzma_is_compressed(const char * input)110*4882a593Smuzhiyun bool lzma_is_compressed(const char *input)
111*4882a593Smuzhiyun {
112*4882a593Smuzhiyun int fd = open(input, O_RDONLY);
113*4882a593Smuzhiyun const uint8_t magic[6] = { 0xFD, '7', 'z', 'X', 'Z', 0x00 };
114*4882a593Smuzhiyun char buf[6] = { 0 };
115*4882a593Smuzhiyun ssize_t rc;
116*4882a593Smuzhiyun
117*4882a593Smuzhiyun if (fd < 0)
118*4882a593Smuzhiyun return -1;
119*4882a593Smuzhiyun
120*4882a593Smuzhiyun rc = read(fd, buf, sizeof(buf));
121*4882a593Smuzhiyun close(fd);
122*4882a593Smuzhiyun return rc == sizeof(buf) ?
123*4882a593Smuzhiyun memcmp(buf, magic, sizeof(buf)) == 0 : false;
124*4882a593Smuzhiyun }
125