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/*
* 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);
}
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