librpc: Shorten dcerpc_binding_handle_call a bit
[Samba/gebeck_regimport.git] / source3 / lib / util_transfer_file.c
blob00a2c9d9de98188baf661878e4b0b35439e6acea
1 /*
2 * Unix SMB/CIFS implementation.
3 * Utility functions to transfer files.
5 * Copyright (C) Jeremy Allison 2001-2002
6 * Copyright (C) Michael Adam 2008
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 3 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include <includes.h>
24 #include "transfer_file.h"
26 /****************************************************************************
27 Transfer some data between two fd's.
28 ****************************************************************************/
30 #ifndef TRANSFER_BUF_SIZE
31 #define TRANSFER_BUF_SIZE 65536
32 #endif
35 ssize_t transfer_file_internal(void *in_file,
36 void *out_file,
37 size_t n,
38 ssize_t (*read_fn)(void *, void *, size_t),
39 ssize_t (*write_fn)(void *, const void *, size_t))
41 char *buf;
42 size_t total = 0;
43 ssize_t read_ret;
44 ssize_t write_ret;
45 size_t num_to_read_thistime;
46 size_t num_written = 0;
48 if (n == 0) {
49 return 0;
52 if ((buf = SMB_MALLOC_ARRAY(char, TRANSFER_BUF_SIZE)) == NULL) {
53 return -1;
56 do {
57 num_to_read_thistime = MIN((n - total), TRANSFER_BUF_SIZE);
59 read_ret = (*read_fn)(in_file, buf, num_to_read_thistime);
60 if (read_ret == -1) {
61 DEBUG(0,("transfer_file_internal: read failure. "
62 "Error = %s\n", strerror(errno) ));
63 SAFE_FREE(buf);
64 return -1;
66 if (read_ret == 0) {
67 break;
70 num_written = 0;
72 while (num_written < read_ret) {
73 write_ret = (*write_fn)(out_file, buf + num_written,
74 read_ret - num_written);
76 if (write_ret == -1) {
77 DEBUG(0,("transfer_file_internal: "
78 "write failure. Error = %s\n",
79 strerror(errno) ));
80 SAFE_FREE(buf);
81 return -1;
83 if (write_ret == 0) {
84 return (ssize_t)total;
87 num_written += (size_t)write_ret;
90 total += (size_t)read_ret;
91 } while (total < n);
93 SAFE_FREE(buf);
94 return (ssize_t)total;
97 static ssize_t sys_read_fn(void *file, void *buf, size_t len)
99 int *fd = (int *)file;
101 return sys_read(*fd, buf, len);
104 static ssize_t sys_write_fn(void *file, const void *buf, size_t len)
106 int *fd = (int *)file;
108 return sys_write(*fd, buf, len);
111 off_t transfer_file(int infd, int outfd, off_t n)
113 return (off_t)transfer_file_internal(&infd, &outfd, (size_t)n,
114 sys_read_fn, sys_write_fn);