tools/perf/util/lzma.c

   1 #include <errno.h>
   2 #include <lzma.h>
   3 #include <stdio.h>
   4 #include <linux/compiler.h>
   5 #include "compress.h"
   6 #include "util.h"
   7 #include "debug.h"
   8
   9 #define BUFSIZE 8192
  10
  11 static const char *lzma_strerror(lzma_ret ret)
  12 {
  13         switch ((int) ret) {
  14         case LZMA_MEM_ERROR:
  15                 return "Memory allocation failed";
  16         case LZMA_OPTIONS_ERROR:
  17                 return "Unsupported decompressor flags";
  18         case LZMA_FORMAT_ERROR:
  19                 return "The input is not in the .xz format";
  20         case LZMA_DATA_ERROR:
  21                 return "Compressed file is corrupt";
  22         case LZMA_BUF_ERROR:
  23                 return "Compressed file is truncated or otherwise corrupt";
  24         default:
  25                 return "Unknown error, possibly a bug";
  26         }
  27 }
  28
  29 int lzma_decompress_to_file(const char *input, int output_fd)
  30 {
  31         lzma_action action = LZMA_RUN;
  32         lzma_stream strm   = LZMA_STREAM_INIT;
  33         lzma_ret ret;
  34         int err = -1;
  35
  36         u8 buf_in[BUFSIZE];
  37         u8 buf_out[BUFSIZE];
  38         FILE *infile;
  39
  40         infile = fopen(input, "rb");
  41         if (!infile) {
  42                 pr_err("lzma: fopen failed on %s: '%s'\n",
  43                        input, strerror(errno));
  44                 return -1;
  45         }
  46
  47         ret = lzma_stream_decoder(&strm, UINT64_MAX, LZMA_CONCATENATED);
  48         if (ret != LZMA_OK) {
  49                 pr_err("lzma: lzma_stream_decoder failed %s (%d)\n",
  50                         lzma_strerror(ret), ret);
  51                 goto err_fclose;
  52         }
  53
  54         strm.next_in   = NULL;
  55         strm.avail_in  = 0;
  56         strm.next_out  = buf_out;
  57         strm.avail_out = sizeof(buf_out);
  58
  59         while (1) {
  60                 if (strm.avail_in == 0 && !feof(infile)) {
  61                         strm.next_in  = buf_in;
  62                         strm.avail_in = fread(buf_in, 1, sizeof(buf_in), infile);
  63
  64                         if (ferror(infile)) {
  65                                 pr_err("lzma: read error: %s\n", strerror(errno));
  66                                 goto err_fclose;
  67                         }
  68
  69                         if (feof(infile))
  70                                 action = LZMA_FINISH;
  71                 }
  72
  73                 ret = lzma_code(&strm, action);
  74
  75                 if (strm.avail_out == 0 || ret == LZMA_STREAM_END) {
  76                         ssize_t write_size = sizeof(buf_out) - strm.avail_out;
  77
  78                         if (writen(output_fd, buf_out, write_size) != write_size) {
  79                                 pr_err("lzma: write error: %s\n", strerror(errno));
  80                                 goto err_fclose;
  81                         }
  82
  83                         strm.next_out  = buf_out;
  84                         strm.avail_out = sizeof(buf_out);
  85                 }
  86
  87                 if (ret != LZMA_OK) {
  88                         if (ret == LZMA_STREAM_END)
  89                                 break;
  90
  91                         pr_err("lzma: failed %s\n", lzma_strerror(ret));
  92                         goto err_fclose;
  93                 }
  94         }
  95
  96         err = 0;
  97 err_fclose:
  98         fclose(infile);
  99         return err;
 100 }