Initial import of libarchive.

What it is:
   A library for reading and writing various streaming archive
   formats, especially tar and cpio.  Being a library, it should
   be easy to incorporate into pkg_* tools, sysinstall, and any
   other place that needs to read or write such archives.

Features:
  * Full automatic detection of both compression and archive format.
  * Extensible internal architecture to make it easy to add new formats.
  * Support for "pax interchange format," a new POSIX-standard tar format
    that eliminates essentially all of the restrictions of historic formats.
  * BSD license

Thanks to: jkh for pushing me to start this work, gordon for
  encouraging me to commit it, bde for answering endless style
  questions, and many others for feedback and encouragement.

Status: Pretty good overall, though there are still a few rough edges and
  the library could always use more testing.  Feedback eagerly solicited.

1 files changed, 109 insertions, 0 deletions

diff --git a/lib/libarchive/archive_read_open_file.c b/lib/libarchive/archive_read_open_file.c
new file mode 100644
index 0000000..f2fdc63
--- /dev/null
+++ b/lib/libarchive/archive_read_open_file.c
@@ -0,0 +1,109 @@
+/*-
+ * Copyright (c) 2003-2004 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
+ *    in this position and unchanged.
+ * 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 <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#ifdef DMALLOC
+#include <dmalloc.h>
+#endif
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "archive.h"
+
+struct read_file_data {
+	int	 fd;
+	size_t	 block_size;
+	void	*buffer;
+	char	 filename[1];
+};
+
+static int	file_close(struct archive *, void *);
+static int	file_open(struct archive *, void *);
+static ssize_t	file_read(struct archive *, void *, const void **buff);
+
+int
+archive_read_open_file(struct archive *a, const char *filename,
+    size_t block_size)
+{
+	struct read_file_data *mine;
+
+	/* XXX detect and report malloc failure XXX */
+	if (filename == NULL) {
+		mine = malloc(sizeof(*mine));
+		mine->filename[0] = 0;
+	} else {
+		mine = malloc(sizeof(*mine) + strlen(filename));
+		strcpy(mine->filename, filename);
+	}
+	mine->block_size = block_size;
+	mine->buffer = malloc(mine->block_size);
+	mine->fd = -1;
+	return (archive_read_open(a, mine, file_open, file_read, file_close));
+}
+
+static int
+file_open(struct archive *a, void *client_data)
+{
+	struct read_file_data *mine = client_data;
+
+	if (*mine->filename != 0)
+		mine->fd = open(mine->filename, O_RDONLY);
+	else
+		mine->fd = 0;
+	if (mine->fd < 0) {
+		archive_set_error(a, errno, "Failed to open '%s'",
+		    mine->filename);
+		return (ARCHIVE_FATAL);
+	}
+	return (0);
+}
+
+static ssize_t
+file_read(struct archive *a, void *client_data, const void **buff)
+{
+	struct read_file_data *mine = client_data;
+
+	(void)a; /* UNUSED */
+	*buff = mine->buffer;
+	return (read(mine->fd, mine->buffer, mine->block_size));
+}
+
+static int
+file_close(struct archive *a, void *client_data)
+{
+	struct read_file_data *mine = client_data;
+
+	(void)a; /* UNUSED */
+	if (mine->fd >= 0)
+		close(mine->fd);
+	free(mine);
+	return (ARCHIVE_OK);
+}