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/* This file is part of GNU tar.
Copyright 2007, 2009, 2013-2014, 2016 Free Software Foundation, Inc.
Written by Sergey Poznyakoff.
GNU tar is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3, or (at your option) any later
version.
GNU tar is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
Public License for more details.
You should have received a copy of the GNU General Public License along
with GNU tar. If not, see <http://www.gnu.org/licenses/>. */
#include <system.h>
#include "common.h"
struct compression_suffix
{
const char *suffix;
size_t length;
const char *program;
};
static struct compression_suffix compression_suffixes[] = {
#define __CAT2__(a,b) a ## b
#define S(s,p) #s, sizeof (#s) - 1, __CAT2__(p,_PROGRAM)
{ "tar", 3, NULL },
{ S(gz, GZIP) },
{ S(tgz, GZIP) },
{ S(taz, GZIP) },
{ S(Z, COMPRESS) },
{ S(taZ, COMPRESS) },
{ S(bz2, BZIP2) },
{ S(tbz, BZIP2) },
{ S(tbz2, BZIP2) },
{ S(tz2, BZIP2) },
{ S(lz, LZIP) },
{ S(lzma, LZMA) },
{ S(tlz, LZMA) },
{ S(lzo, LZOP) },
{ S(xz, XZ) },
{ S(txz, XZ) }, /* Slackware */
{ NULL }
#undef S
#undef __CAT2__
};
static struct compression_suffix const *
find_compression_suffix (const char *name, size_t *ret_len)
{
char *suf = strrchr (name, '.');
if (suf)
{
size_t len;
struct compression_suffix *p;
suf++;
len = strlen (suf);
for (p = compression_suffixes; p->suffix; p++)
{
if (p->length == len && memcmp (p->suffix, suf, len) == 0)
{
if (ret_len)
*ret_len = strlen (name) - len - 1;
return p;
}
}
}
return NULL;
}
static const char *
find_compression_program (const char *name, const char *defprog)
{
struct compression_suffix const *p = find_compression_suffix (name, NULL);
if (p)
return p->program;
return defprog;
}
void
set_compression_program_by_suffix (const char *name, const char *defprog)
{
const char *program = find_compression_program (name, defprog);
if (program)
use_compress_program_option = program;
}
char *
strip_compression_suffix (const char *name)
{
char *s = NULL;
size_t len;
if (find_compression_suffix (name, &len))
{
if (strncmp (name + len - 4, ".tar", 4) == 0)
len -= 4;
if (len == 0)
return NULL;
s = xmalloc (len + 1);
memcpy (s, name, len);
s[len] = 0;
}
return s;
}
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