3d45373d3b
* configure.ac (zstd): Register compression program. * doc/tar.1: Mention --zstd. * doc/tar.texi: Document zstd support. * src/buffer.c: Register zstd compression. * src/suffix.c: Add suffixes zst and tzst. * src/tar.c: New compression option --zstd.
118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
/* This file is part of GNU tar.
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Copyright 2007, 2009, 2013-2014, 2016-2017 Free Software Foundation,
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Inc.
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Written by Sergey Poznyakoff.
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GNU tar is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3, or (at your option) any later
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version.
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GNU tar is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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Public License for more details.
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You should have received a copy of the GNU General Public License along
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with GNU tar. If not, see <http://www.gnu.org/licenses/>. */
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#include <system.h>
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#include "common.h"
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struct compression_suffix
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{
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const char *suffix;
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size_t length;
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const char *program;
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};
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static struct compression_suffix compression_suffixes[] = {
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#define __CAT2__(a,b) a ## b
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#define S(s,p) #s, sizeof (#s) - 1, __CAT2__(p,_PROGRAM)
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{ "tar", 3, NULL },
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{ S(gz, GZIP) },
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{ S(tgz, GZIP) },
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{ S(taz, GZIP) },
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{ S(Z, COMPRESS) },
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{ S(taZ, COMPRESS) },
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{ S(bz2, BZIP2) },
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{ S(tbz, BZIP2) },
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{ S(tbz2, BZIP2) },
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{ S(tz2, BZIP2) },
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{ S(lz, LZIP) },
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{ S(lzma, LZMA) },
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{ S(tlz, LZMA) },
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{ S(lzo, LZOP) },
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{ S(xz, XZ) },
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{ S(txz, XZ) }, /* Slackware */
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{ S(zst, ZSTD) },
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{ S(tzst, ZSTD) },
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{ NULL }
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#undef S
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#undef __CAT2__
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};
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static struct compression_suffix const *
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find_compression_suffix (const char *name, size_t *ret_len)
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{
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char *suf = strrchr (name, '.');
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if (suf)
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{
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size_t len;
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struct compression_suffix *p;
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suf++;
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len = strlen (suf);
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for (p = compression_suffixes; p->suffix; p++)
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{
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if (p->length == len && memcmp (p->suffix, suf, len) == 0)
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{
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if (ret_len)
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*ret_len = strlen (name) - len - 1;
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return p;
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}
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}
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}
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return NULL;
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}
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static const char *
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find_compression_program (const char *name, const char *defprog)
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{
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struct compression_suffix const *p = find_compression_suffix (name, NULL);
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if (p)
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return p->program;
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return defprog;
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}
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void
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set_compression_program_by_suffix (const char *name, const char *defprog)
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{
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const char *program = find_compression_program (name, defprog);
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if (program)
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use_compress_program_option = program;
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}
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char *
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strip_compression_suffix (const char *name)
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{
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char *s = NULL;
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size_t len;
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if (find_compression_suffix (name, &len))
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{
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if (strncmp (name + len - 4, ".tar", 4) == 0)
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len -= 4;
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if (len == 0)
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return NULL;
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s = xmalloc (len + 1);
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memcpy (s, name, len);
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s[len] = 0;
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}
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return s;
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}
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