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author | Lorry Tar Creator <lorry-tar-importer@lorry> | 2016-05-16 09:22:21 +0000 |
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committer | Lorry Tar Creator <lorry-tar-importer@lorry> | 2016-05-16 09:22:21 +0000 |
commit | d4fdeab4db0d0e699c8fbbb07f12c4e1f64d0f94 (patch) | |
tree | 72231a38ed1cdd48ac6e02acb8b3917acb9dbcf4 /src/suffix.c | |
download | tar-tarball-master.tar.gz |
Diffstat (limited to 'src/suffix.c')
-rw-r--r-- | src/suffix.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/src/suffix.c b/src/suffix.c new file mode 100644 index 0000000..a7695b9 --- /dev/null +++ b/src/suffix.c @@ -0,0 +1,114 @@ +/* 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; +} + |