tools/perf/util/lzma.c

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