1 files changed, 89 insertions, 0 deletions
diff --git a/lib/libarchive/archive_read_data_into_fd.c b/lib/libarchive/archive_read_data_into_fd.c
new file mode 100644
index 0000000..cc15a9c
--- /dev/null
+++ b/lib/libarchive/archive_read_data_into_fd.c
@@ -0,0 +1,89 @@
+/*-
+ * 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("$FreeBSD$");
+
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#include "archive.h"
+#include "archive_private.h"
+
+/* Maximum amount of data to write at one time. */
+#define	MAX_WRITE	(1024 * 1024)
+
+/*
+ * This implementation minimizes copying of data and is sparse-file aware.
+ */
+int
+archive_read_data_into_fd(struct archive *a, int fd)
+{
+	int r;
+	const void *buff;
+	size_t size, bytes_to_write;
+	ssize_t bytes_written, total_written;
+	off_t offset;
+	off_t output_offset;
+
+	__archive_check_magic(a, ARCHIVE_READ_MAGIC, ARCHIVE_STATE_DATA, "archive_read_data_into_fd");
+
+	total_written = 0;
+	output_offset = 0;
+
+	while ((r = archive_read_data_block(a, &buff, &size, &offset)) ==
+	    ARCHIVE_OK) {
+		const char *p = buff;
+		if (offset > output_offset) {
+			lseek(fd, offset - output_offset, SEEK_CUR);
+			output_offset = offset;
+		}
+		while (size > 0) {
+			bytes_to_write = size;
+			if (bytes_to_write > MAX_WRITE)
+				bytes_to_write = MAX_WRITE;
+			bytes_written = write(fd, p, bytes_to_write);
+			if (bytes_written < 0) {
+				archive_set_error(a, errno, "Write error");
+				return (-1);
+			}
+			output_offset += bytes_written;
+			total_written += bytes_written;
+			p += bytes_written;
+			size -= bytes_written;
+		}
+	}
+
+	if (r != ARCHIVE_EOF)
+		return (r);
+	return (ARCHIVE_OK);
+}