/* 
   Unix SMB/CIFS implementation.

   SMB2 client read call

   Copyright (C) Andrew Tridgell 2005
   
   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"
#include "libcli/raw/libcliraw.h"
#include "libcli/smb2/smb2.h"
#include "libcli/smb2/smb2_calls.h"

/*
  send a read request
*/
struct smb2_request *smb2_read_send(struct smb2_tree *tree, struct smb2_read *io)
{
	struct smb2_request *req;

	req = smb2_request_init_tree(tree, SMB2_OP_READ, 0x31);
	if (req == NULL) return NULL;

	SSVAL(req->out.body, 0x00, io->in.buffer_code);
	SSVAL(req->out.body, 0x02, 0);
	SIVAL(req->out.body, 0x04, io->in.length);
	SBVAL(req->out.body, 0x08, io->in.offset);
	smb2_put_handle(req->out.body+0x10, io->in.handle);
	memcpy(req->out.body+0x20, io->in._pad, 17);

	smb2_transport_send(req);

	return req;
}


/*
  recv a read reply
*/
NTSTATUS smb2_read_recv(struct smb2_request *req, 
			TALLOC_CTX *mem_ctx, struct smb2_read *io)
{
	uint16_t ofs;
	uint32_t nread;

	if (!smb2_request_receive(req) || 
	    smb2_request_is_error(req)) {
		return smb2_request_destroy(req);
	}

	if (req->in.body_size < 16) {
		return NT_STATUS_BUFFER_TOO_SMALL;
	}

	SMB2_CHECK_BUFFER_CODE(req, 0x11);

	ofs = SVAL(req->in.body, 0x02);

	nread = IVAL(req->in.body, 0x04);
	memcpy(io->out.unknown, req->in.body+0x08, 8);

	if (smb2_oob_in(req, req->in.hdr+ofs, nread)) {
		return NT_STATUS_BUFFER_TOO_SMALL;
	}

	io->out.data = data_blob_talloc(mem_ctx, req->in.hdr+ofs, nread);
	if (io->out.data.data == NULL) {
		return NT_STATUS_NO_MEMORY;
	}

	return smb2_request_destroy(req);
}

/*
  sync read request
*/
NTSTATUS smb2_read(struct smb2_tree *tree, TALLOC_CTX *mem_ctx, struct smb2_read *io)
{
	struct smb2_request *req = smb2_read_send(tree, io);
	return smb2_read_recv(req, mem_ctx, io);
}