1 files changed, 119 insertions, 0 deletions
diff --git a/source3/lib/util_transfer_file.c b/source3/lib/util_transfer_file.c
new file mode 100644
index 0000000..5653906
--- /dev/null
+++ b/source3/lib/util_transfer_file.c
@@ -0,0 +1,119 @@
+/*
+ * Unix SMB/CIFS implementation.
+ * Utility functions to transfer files.
+ *
+ * Copyright (C) Jeremy Allison 2001-2002
+ * Copyright (C) Michael Adam 2008
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include <includes.h>
+#include "transfer_file.h"
+#include "lib/util/sys_rw.h"
+
+/****************************************************************************
+ Transfer some data between two fd's.
+****************************************************************************/
+
+#ifndef TRANSFER_BUF_SIZE
+#define TRANSFER_BUF_SIZE 65536
+#endif
+
+
+ssize_t transfer_file_internal(void *in_file,
+			       void *out_file,
+			       size_t n,
+			       ssize_t (*pread_fn)(void *, void *, size_t, off_t),
+			       ssize_t (*pwrite_fn)(void *, const void *, size_t, off_t))
+{
+	char *buf;
+	size_t total = 0;
+	ssize_t read_ret;
+	ssize_t write_ret;
+	size_t num_to_read_thistime;
+	size_t num_written = 0;
+	off_t offset = 0;
+
+	if (n == 0) {
+		return 0;
+	}
+
+	if ((buf = SMB_MALLOC_ARRAY(char, TRANSFER_BUF_SIZE)) == NULL) {
+		return -1;
+	}
+
+	do {
+		num_to_read_thistime = MIN((n - total), TRANSFER_BUF_SIZE);
+
+		read_ret = (*pread_fn)(in_file, buf, num_to_read_thistime, offset);
+		if (read_ret == -1) {
+			DEBUG(0,("transfer_file_internal: read failure. "
+				 "Error = %s\n", strerror(errno) ));
+			SAFE_FREE(buf);
+			return -1;
+		}
+		if (read_ret == 0) {
+			break;
+		}
+
+		num_written = 0;
+
+		while (num_written < read_ret) {
+			write_ret = (*pwrite_fn)(out_file, buf + num_written,
+					        read_ret - num_written,
+						offset + num_written);
+
+			if (write_ret == -1) {
+				DEBUG(0,("transfer_file_internal: "
+					 "write failure. Error = %s\n",
+					 strerror(errno) ));
+				SAFE_FREE(buf);
+				return -1;
+			}
+			if (write_ret == 0) {
+				return (ssize_t)total;
+			}
+
+			num_written += (size_t)write_ret;
+		}
+
+		total += (size_t)read_ret;
+		offset += (off_t)read_ret;
+	} while (total < n);
+
+	SAFE_FREE(buf);
+	return (ssize_t)total;
+}
+
+static ssize_t sys_pread_fn(void *file, void *buf, size_t len, off_t offset)
+{
+	int *fd = (int *)file;
+
+	return sys_pread(*fd, buf, len, offset);
+}
+
+static ssize_t sys_pwrite_fn(void *file, const void *buf, size_t len, off_t offset)
+{
+	int *fd = (int *)file;
+
+	return sys_pwrite(*fd, buf, len, offset);
+}
+
+off_t transfer_file(int infd, int outfd, off_t n)
+{
+	return (off_t)transfer_file_internal(&infd, &outfd, (size_t)n,
+						 sys_pread_fn, sys_pwrite_fn);
+}