Dogcows Code - chaz/tar/blob - src/suffix.c

   1 /* This file is part of GNU tar.
   2    Copyright (C) 2007 Free Software Foundation, Inc.
   3
   4    Written by Sergey Poznyakoff.
   5
   6    GNU tar is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by the
   8    Free Software Foundation; either version 3, or (at your option) any later
   9    version.
  10
  11    GNU tar is distributed in the hope that it will be useful, but
  12    WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
  14    Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License along
  17    with GNU tar.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include <system.h>
  20 #include "common.h"
  21
  22 struct compression_suffix
  23 {
  24   const char *suffix;
  25   size_t length;
  26   const char *program;
  27 };
  28
  29 struct compression_suffix compression_suffixes[] = {
  30 #define S(s,p) #s, sizeof (#s) - 1, #p
  31   { S(gz, gzip) },
  32   { S(tgz, gzip) },
  33   { S(taz, gzip) },
  34   { S(Z, compress) },
  35   { S(taZ, compress) },
  36   { S(bz2, bzip2) },
  37   { S(tbz, bzip2) },
  38   { S(tbz2, bzip2) },
  39   { S(tz2, bzip2) },
  40   { S(lzma, lzma) },
  41   { S(tlz, lzma) },
  42 #undef S
  43 };
  44
  45 int nsuffixes = sizeof (compression_suffixes) /
  46                   sizeof (compression_suffixes[0]);
  47
  48 static const char *
  49 find_compression_program (const char *name, const char *defprog)
  50 {
  51   char *suf = strrchr (name, '.');
  52
  53   if (suf)
  54     {
  55       int i;
  56       size_t len;
  57
  58       suf++;
  59       len = strlen (suf);
  60
  61       for (i = 0; i < nsuffixes; i++)
  62         {
  63           if (compression_suffixes[i].length == len
  64               && memcmp (compression_suffixes[i].suffix, suf, len) == 0)
  65             return compression_suffixes[i].program;
  66         }
  67     }
  68   return defprog;
  69 }
  70
  71 void
  72 set_comression_program_by_suffix (const char *name, const char *defprog)
  73 {
  74   const char *program = find_compression_program (name, defprog);
  75   if (program)
  76     use_compress_program_option = program;
  77 }
  78