1 files changed, 64 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 000000000000..7dad23379350
--- /dev/null
+++ b/lib/libarchive/archive_read_data_into_fd.c
@@ -0,0 +1,64 @@
+/*-
+ * 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 <unistd.h>
+
+#include "archive.h"
+#include "archive_private.h"
+
+/*
+ * This implementation minimizes copying of data.
+ */
+ssize_t
+archive_read_data_into_fd(struct archive *a, int fd)
+{
+	ssize_t bytes_read, bytes_written, total_written;
+	const void *buff;
+
+	total_written = 0;
+	while (a->entry_bytes_remaining > 0) {
+		bytes_read = (a->compression_read_ahead)(a, &buff,
+		    a->entry_bytes_remaining);
+		if (bytes_read < 0)
+			return (-1);
+		if ((size_t)bytes_read > a->entry_bytes_remaining)
+			bytes_read = (ssize_t)a->entry_bytes_remaining;
+
+		bytes_written = write(fd, buff, bytes_read);
+		if (bytes_written < 0)
+			return (-1);
+		(a->compression_read_consume)(a, bytes_written);
+		total_written += bytes_written;
+		a->entry_bytes_remaining -= bytes_written;
+	}
+	return (total_written);
+}