tar-1.29HEADtar-1.29master

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;
+}
+