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/*
Unix SMB/CIFS implementation.
client file read/write routines
Copyright (C) Andrew Tridgell 1994-1998
Copyright (C) James Myers 2003
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
/****************************************************************************
Read size bytes at offset offset using SMBreadX.
****************************************************************************/
ssize_t cli_read(struct cli_state *cli, int fnum, char *buf, off_t offset, size_t size)
{
union smb_read parms;
int readsize;
ssize_t total = 0;
if (size == 0) {
return 0;
}
parms.readx.level = RAW_READ_READX;
parms.readx.in.fnum = fnum;
/*
* Set readsize to the maximum size we can handle in one readX,
* rounded down to a multiple of 1024.
*/
readsize = (cli->transport->negotiate.max_xmit - (MIN_SMB_SIZE+32)) & ~1023;
if (readsize > 0xFFFF) readsize = 0xFFFF;
while (total < size) {
NTSTATUS status;
readsize = MIN(readsize, size-total);
parms.readx.in.offset = offset;
parms.readx.in.mincnt = readsize;
parms.readx.in.maxcnt = readsize;
parms.readx.in.remaining = size - total;
parms.readx.out.data = buf + total;
status = smb_raw_read(cli->tree, &parms);
if (!NT_STATUS_IS_OK(status)) {
return -1;
}
total += parms.readx.out.nread;
offset += parms.readx.out.nread;
/* If the server returned less than we asked for we're at EOF */
if (parms.readx.out.nread < readsize)
break;
}
return total;
}
/****************************************************************************
write to a file
write_mode: 0x0001 disallow write cacheing
0x0002 return bytes remaining
0x0004 use raw named pipe protocol
0x0008 start of message mode named pipe protocol
****************************************************************************/
ssize_t cli_write(struct cli_state *cli,
int fnum, uint16 write_mode,
const char *buf, off_t offset, size_t size)
{
union smb_write parms;
int block = (cli->transport->negotiate.max_xmit - (MIN_SMB_SIZE+32)) & ~1023;
ssize_t total = 0;
if (size == 0) {
return 0;
}
if (block > 0xFFFF) block = 0xFFFF;
parms.writex.level = RAW_WRITE_WRITEX;
parms.writex.in.fnum = fnum;
parms.writex.in.wmode = write_mode;
parms.writex.in.remaining = 0;
while (total < size) {
NTSTATUS status;
block = MIN(block, size - total);
parms.writex.in.offset = offset;
parms.writex.in.count = block;
parms.writex.in.data = buf;
status = smb_raw_write(cli->tree, &parms);
if (!NT_STATUS_IS_OK(status)) {
return -1;
}
offset += parms.writex.out.nwritten;
total += parms.writex.out.nwritten;
buf += parms.writex.out.nwritten;
}
return total;
}
/****************************************************************************
write to a file using a SMBwrite and not bypassing 0 byte writes
****************************************************************************/
ssize_t cli_smbwrite(struct cli_state *cli,
int fnum, char *buf, off_t offset, size_t size1)
{
union smb_write parms;
ssize_t total = 0;
parms.write.level = RAW_WRITE_WRITE;
parms.write.in.remaining = 0;
do {
size_t size = MIN(size1, cli->transport->negotiate.max_xmit - 48);
if (size > 0xFFFF) size = 0xFFFF;
parms.write.in.fnum = fnum;
parms.write.in.offset = offset;
parms.write.in.count = size;
parms.write.in.data = buf + total;
if (NT_STATUS_IS_ERR(smb_raw_write(cli->tree, &parms)))
return -1;
size = parms.write.out.nwritten;
if (size == 0)
break;
size1 -= size;
total += size;
offset += size;
} while (size1);
return total;
}
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