From a9490c597b215e790f04ba57fe2e9ff2fe06671b Mon Sep 17 00:00:00 2001
From: Tim Kientzle <kientzle@FreeBSD.org>
Date: Thu, 1 Feb 2007 06:18:17 +0000
Subject: Add support for a new archive format "empty" that reads empty files.

---
 lib/libarchive/archive_read_support_format_empty.c | 90 ++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 lib/libarchive/archive_read_support_format_empty.c

(limited to 'lib/libarchive/archive_read_support_format_empty.c')

diff --git a/lib/libarchive/archive_read_support_format_empty.c b/lib/libarchive/archive_read_support_format_empty.c
new file mode 100644
index 0000000000000..2df219467f392
--- /dev/null
+++ b/lib/libarchive/archive_read_support_format_empty.c
@@ -0,0 +1,90 @@
+/*-
+ * Copyright (c) 2003-2007 Tim Kientzle
+ * All rights reserved.
+ *
+ * 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, 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(S) ``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(S) 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.
+ */
+
+#include "archive_platform.h"
+__FBSDID("$FreeBSD$");
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "archive_private.h"
+
+static int	archive_read_format_empty_bid(struct archive *);
+static int	archive_read_format_empty_read_data(struct archive *,
+		    const void **, size_t *, off_t *);
+static int	archive_read_format_empty_read_header(struct archive *,
+		    struct archive_entry *);
+int
+archive_read_support_format_empty(struct archive *a)
+{
+	int r;
+
+	r = __archive_read_register_format(a,
+	    NULL,
+	    archive_read_format_empty_bid,
+	    archive_read_format_empty_read_header,
+	    archive_read_format_empty_read_data,
+	    NULL,
+	    NULL);
+
+	return (r);
+}
+
+
+static int
+archive_read_format_empty_bid(struct archive *a)
+{
+	int bytes_read;
+	const void *h;
+
+	bytes_read = (a->compression_read_ahead)(a, &h, 1);
+	if (bytes_read > 0)
+		return (-1);
+	return (1);
+}
+
+static int
+archive_read_format_empty_read_header(struct archive *a,
+    struct archive_entry *entry)
+{
+	(void)a; /* UNUSED */
+	(void)entry; /* UNUSED */
+
+	a->archive_format = ARCHIVE_FORMAT_EMPTY;
+	a->archive_format_name = "Empty file";
+
+	return (ARCHIVE_EOF);
+}
+
+static int
+archive_read_format_empty_read_data(struct archive *a,
+    const void **buff, size_t *size, off_t *offset)
+{
+	(void)a; /* UNUSED */
+	(void)buff; /* UNUSED */
+	(void)size; /* UNUSED */
+	(void)offset; /* UNUSED */
+
+	return (ARCHIVE_EOF);
+}
-- 
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