From 6d04d9655f29085945526bc4f9921c4724895aa2 Mon Sep 17 00:00:00 2001
From: Tim Kientzle <kientzle@gmail.com>
Date: Wed, 30 Apr 2008 18:11:33 -0400
Subject: Include 'examples' and 'contrib' dirs from libarchive portable
 distro.

SVN-Revision: 8
---
 examples/tarfilter.c | 113 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 examples/tarfilter.c

(limited to 'examples/tarfilter.c')

diff --git a/examples/tarfilter.c b/examples/tarfilter.c
new file mode 100644
index 00000000..b7e08cfc
--- /dev/null
+++ b/examples/tarfilter.c
@@ -0,0 +1,113 @@
+/*
+ * This file is in the public domain.
+ *
+ * Feel free to use it as you wish.
+ */
+
+/*
+ * This example program reads an archive from stdin (which can be in
+ * any format recognized by libarchive) and writes certain entries to
+ * an uncompressed ustar archive on stdout.  This is a template for
+ * many kinds of archive manipulation: converting formats, resetting
+ * ownership, inserting entries, removing entries, etc.
+ *
+ * To compile:
+ * gcc -Wall -o tarfilter tarfilter.c -larchive -lz -lbz2
+ */
+
+#include <sys/stat.h>
+#include <archive.h>
+#include <archive_entry.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static void
+die(char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	vfprintf(stderr, fmt, ap);
+	va_end(ap);
+	fprintf(stderr, "\n");
+	exit(1);
+}
+
+int
+main(int argc, char **argv)
+{
+	char buff[8192];
+	ssize_t len;
+	int r;
+	mode_t m;
+	struct archive *ina;
+	struct archive *outa;
+	struct archive_entry *entry;
+
+	/* Read an archive from stdin, with automatic format detection. */
+	ina = archive_read_new();
+	if (ina == NULL)
+		die("Couldn't create archive reader.");
+	if (archive_read_support_compression_all(ina) != ARCHIVE_OK)
+		die("Couldn't enable decompression");
+	if (archive_read_support_format_all(ina) != ARCHIVE_OK)
+		die("Couldn't enable read formats");
+	if (archive_read_open_fd(ina, 0, 10240) != ARCHIVE_OK)
+		die("Couldn't open input archive");
+
+	/* Write an uncompressed ustar archive to stdout. */
+	outa = archive_write_new();
+	if (outa == NULL)
+		die("Couldn't create archive writer.");
+	if (archive_write_set_compression_none(outa) != ARCHIVE_OK)
+		die("Couldn't enable compression");
+	if (archive_write_set_format_ustar(outa) != ARCHIVE_OK)
+		die("Couldn't set output format");
+	if (archive_write_open_fd(outa, 1) != ARCHIVE_OK)
+		die("Couldn't open output archive");
+
+	/* Examine each entry in the input archive. */
+	while ((r = archive_read_next_header(ina, &entry)) == ARCHIVE_OK) {
+		fprintf(stderr, "%s: ", archive_entry_pathname(entry));
+
+		/* Skip anything that isn't a regular file. */
+		if (!S_ISREG(archive_entry_mode(entry))) {
+			fprintf(stderr, "skipped\n");
+			continue;
+		}
+
+		/* Make everything owned by root/wheel. */
+		archive_entry_set_uid(entry, 0);
+		archive_entry_set_uname(entry, "root");
+		archive_entry_set_gid(entry, 0);
+		archive_entry_set_gname(entry, "wheel");
+
+		/* Make everything permission 0744, strip SUID, etc. */
+		m = archive_entry_mode(entry);
+		archive_entry_set_mode(entry, (m & ~07777) | 0744);
+
+		/* Copy input entries to output archive. */
+		if (archive_write_header(outa, entry) != ARCHIVE_OK)
+			die("Error writing output archive");
+		if (archive_entry_size(entry) > 0) {
+			len = archive_read_data(ina, buff, sizeof(buff));
+			while (len > 0) {
+				if (archive_write_data(outa, buff, len) != len)
+					die("Error writing output archive");
+				len = archive_read_data(ina, buff, sizeof(buff));
+			}
+			if (len < 0)
+				die("Error reading input archive");
+		}
+		fprintf(stderr, "copied\n");
+	}
+	if (r != ARCHIVE_EOF)
+		die("Error reading archive");
+	/* Close the archives.  */
+	if (archive_read_finish(ina) != ARCHIVE_OK)
+		die("Error closing input archive");
+	if (archive_write_finish(outa) != ARCHIVE_OK)
+		die("Error closing output archive");
+	return (0);
+}
-- 
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