Flatten the file vendor area.

Remove the svn:keywords property from the vendor files.

1 files changed, 155 insertions, 0 deletions

diff --git a/is_tar.c b/is_tar.c
new file mode 100644
index 0000000..142b487
--- /dev/null
+++ b/is_tar.c
@@ -0,0 +1,155 @@
+/*
+ * Copyright (c) Ian F. Darwin 1986-1995.
+ * Software written by Ian F. Darwin and others;
+ * maintained 1995-present by Christos Zoulas and others.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice immediately at the beginning of the file, without modification,
+ *    this list of conditions, and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *  
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+/*
+ * is_tar() -- figure out whether file is a tar archive.
+ *
+ * Stolen (by the author!) from the public domain tar program:
+ * Public Domain version written 26 Aug 1985 John Gilmore (ihnp4!hoptoad!gnu).
+ *
+ * @(#)list.c 1.18 9/23/86 Public Domain - gnu
+ *
+ * Comments changed and some code/comments reformatted
+ * for file command by Ian Darwin.
+ */
+
+#include "file.h"
+#include "magic.h"
+#include <string.h>
+#include <ctype.h>
+#include <sys/types.h>
+#include "tar.h"
+
+#ifndef lint
+FILE_RCSID("@(#)$File: is_tar.c,v 1.29 2007/10/17 19:33:31 christos Exp $")
+#endif
+
+#define	isodigit(c)	( ((c) >= '0') && ((c) <= '7') )
+
+private int is_tar(const unsigned char *, size_t);
+private int from_oct(int, const char *);	/* Decode octal number */
+
+static const char *tartype[] = {
+	"tar archive",
+	"POSIX tar archive",
+	"POSIX tar archive (GNU)",
+};
+
+protected int
+file_is_tar(struct magic_set *ms, const unsigned char *buf, size_t nbytes)
+{
+	/*
+	 * Do the tar test first, because if the first file in the tar
+	 * archive starts with a dot, we can confuse it with an nroff file.
+	 */
+	int tar = is_tar(buf, nbytes);
+	int mime = ms->flags & MAGIC_MIME;
+
+	if (tar < 1 || tar > 3)
+		return 0;
+
+	if (mime == MAGIC_MIME_ENCODING)
+		return 0;
+
+	if (file_printf(ms, mime ? "application/x-tar" :
+	    tartype[tar - 1]) == -1)
+		return -1;
+	return 1;
+}
+
+/*
+ * Return 
+ *	0 if the checksum is bad (i.e., probably not a tar archive), 
+ *	1 for old UNIX tar file,
+ *	2 for Unix Std (POSIX) tar file.
+ */
+private int
+is_tar(const unsigned char *buf, size_t nbytes)
+{
+	const union record *header = (const union record *)(const void *)buf;
+	int	i;
+	int	sum, recsum;
+	const char	*p;
+
+	if (nbytes < sizeof(union record))
+		return 0;
+
+	recsum = from_oct(8,  header->header.chksum);
+
+	sum = 0;
+	p = header->charptr;
+	for (i = sizeof(union record); --i >= 0;) {
+		/*
+		 * We cannot use unsigned char here because of old compilers,
+		 * e.g. V7.
+		 */
+		sum += 0xFF & *p++;
+	}
+
+	/* Adjust checksum to count the "chksum" field as blanks. */
+	for (i = sizeof(header->header.chksum); --i >= 0;)
+		sum -= 0xFF & header->header.chksum[i];
+	sum += ' '* sizeof header->header.chksum;	
+
+	if (sum != recsum)
+		return 0;	/* Not a tar archive */
+	
+	if (strcmp(header->header.magic, GNUTMAGIC) == 0) 
+		return 3;		/* GNU Unix Standard tar archive */
+	if (strcmp(header->header.magic, TMAGIC) == 0) 
+		return 2;		/* Unix Standard tar archive */
+
+	return 1;			/* Old fashioned tar archive */
+}
+
+
+/*
+ * Quick and dirty octal conversion.
+ *
+ * Result is -1 if the field is invalid (all blank, or nonoctal).
+ */
+private int
+from_oct(int digs, const char *where)
+{
+	int	value;
+
+	while (isspace((unsigned char)*where)) {	/* Skip spaces */
+		where++;
+		if (--digs <= 0)
+			return -1;		/* All blank field */
+	}
+	value = 0;
+	while (digs > 0 && isodigit(*where)) {	/* Scan til nonoctal */
+		value = (value << 3) | (*where++ - '0');
+		--digs;
+	}
+
+	if (digs > 0 && *where && !isspace((unsigned char)*where))
+		return -1;			/* Ended on non-space/nul */
+
+	return value;
+}