1 // SPDX-License-Identifier: GPL-2.0
5 #include <linux/compiler.h>
12 static const char *lzma_strerror(lzma_ret ret)
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";
22 return "Compressed file is corrupt";
24 return "Compressed file is truncated or otherwise corrupt";
26 return "Unknown error, possibly a bug";
30 int lzma_decompress_to_file(const char *input, int output_fd)
32 lzma_action action = LZMA_RUN;
33 lzma_stream strm = LZMA_STREAM_INIT;
41 infile = fopen(input, "rb");
43 pr_err("lzma: fopen failed on %s: '%s'\n",
44 input, strerror(errno));
48 ret = lzma_stream_decoder(&strm, UINT64_MAX, LZMA_CONCATENATED);
50 pr_err("lzma: lzma_stream_decoder failed %s (%d)\n",
51 lzma_strerror(ret), ret);
57 strm.next_out = buf_out;
58 strm.avail_out = sizeof(buf_out);
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);
66 pr_err("lzma: read error: %s\n", strerror(errno));
74 ret = lzma_code(&strm, action);
76 if (strm.avail_out == 0 || ret == LZMA_STREAM_END) {
77 ssize_t write_size = sizeof(buf_out) - strm.avail_out;
79 if (writen(output_fd, buf_out, write_size) != write_size) {
80 pr_err("lzma: write error: %s\n", strerror(errno));
84 strm.next_out = buf_out;
85 strm.avail_out = sizeof(buf_out);
89 if (ret == LZMA_STREAM_END)
92 pr_err("lzma: failed %s\n", lzma_strerror(ret));