tools/perf/util/lzma.c

   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_lzma_end;
  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_lzma_end;
  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_lzma_end;
  94                 }
  95         }
  96
  97         err = 0;
  98 err_lzma_end:
  99         lzma_end(&strm);
 100 err_fclose:
 101         fclose(infile);
 102         return err;
 103 }