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Linux/tools/perf/util/lzma.c

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  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 
 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 
 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 

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