kernel/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
  33         u8 buf_in[BUFSIZE];
  34         u8 buf_out[BUFSIZE];
  35         FILE *infile;
  36
  37         infile = fopen(input, "rb");
  38         if (!infile) {
  39                 pr_err("lzma: fopen failed on %s: '%s'\n",
  40                        input, strerror(errno));
  41                 return -1;
  42         }
  43
  44         ret = lzma_stream_decoder(&strm, UINT64_MAX, LZMA_CONCATENATED);
  45         if (ret != LZMA_OK) {
  46                 pr_err("lzma: lzma_stream_decoder failed %s (%d)\n",
  47                         lzma_strerror(ret), ret);
  48                 return -1;
  49         }
  50
  51         strm.next_in   = NULL;
  52         strm.avail_in  = 0;
  53         strm.next_out  = buf_out;
  54         strm.avail_out = sizeof(buf_out);
  55
  56         while (1) {
  57                 if (strm.avail_in == 0 && !feof(infile)) {
  58                         strm.next_in  = buf_in;
  59                         strm.avail_in = fread(buf_in, 1, sizeof(buf_in), infile);
  60
  61                         if (ferror(infile)) {
  62                                 pr_err("lzma: read error: %s\n", strerror(errno));
  63                                 return -1;
  64                         }
  65
  66                         if (feof(infile))
  67                                 action = LZMA_FINISH;
  68                 }
  69
  70                 ret = lzma_code(&strm, action);
  71
  72                 if (strm.avail_out == 0 || ret == LZMA_STREAM_END) {
  73                         ssize_t write_size = sizeof(buf_out) - strm.avail_out;
  74
  75                         if (writen(output_fd, buf_out, write_size) != write_size) {
  76                                 pr_err("lzma: write error: %s\n", strerror(errno));
  77                                 return -1;
  78                         }
  79
  80                         strm.next_out  = buf_out;
  81                         strm.avail_out = sizeof(buf_out);
  82                 }
  83
  84                 if (ret != LZMA_OK) {
  85                         if (ret == LZMA_STREAM_END)
  86                                 return 0;
  87
  88                         pr_err("lzma: failed %s\n", lzma_strerror(ret));
  89                         return -1;
  90                 }
  91         }
  92
  93         fclose(infile);
  94         return 0;
  95 }