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/*
(c) Copyright 2012-2013 DirectFB integrated media GmbH
(c) Copyright 2001-2013 The world wide DirectFB Open Source Community (directfb.org)
(c) Copyright 2000-2004 Convergence (integrated media) GmbH
All rights reserved.
Written by Denis Oliver Kropp <dok@directfb.org>,
Andreas Shimokawa <andi@directfb.org>,
Marek Pikarski <mass@directfb.org>,
Sven Neumann <neo@directfb.org>,
Ville Syrjälä <syrjala@sci.fi> and
Claudio Ciccani <klan@users.sf.net>.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#ifndef __VOODOO__MESSAGE_H__
#define __VOODOO__MESSAGE_H__
#include <voodoo/types.h>
#include <direct/debug.h>
#include <direct/memcpy.h>
#define VOODOO_MSG_ALIGN(i) (((i) + 3) & ~3)
typedef enum {
VMBT_NONE,
VMBT_ID,
VMBT_INT,
VMBT_UINT,
VMBT_DATA,
VMBT_ODATA,
VMBT_STRING
} VoodooMessageBlockType;
typedef enum {
VREQ_NONE = 0x00000000,
VREQ_RESPOND = 0x00000001,
VREQ_ASYNC = 0x00000002,
VREQ_QUEUE = 0x00000004
} VoodooRequestFlags;
typedef enum {
VMSG_SUPER,
VMSG_REQUEST,
VMSG_RESPONSE,
VMSG_DISCOVER, // temporary solution for compatibility
VMSG_SENDINFO, // temporary solution for compatibility
} VoodooMessageType;
struct __V_VoodooMessageHeader {
int size;
VoodooMessageSerial serial;
VoodooMessageType type;
};
struct __V_VoodooSuperMessage {
VoodooMessageHeader header;
};
struct __V_VoodooRequestMessage {
VoodooMessageHeader header;
VoodooInstanceID instance;
VoodooMethodID method;
VoodooRequestFlags flags;
};
struct __V_VoodooResponseMessage {
VoodooMessageHeader header;
VoodooMessageSerial request;
DirectResult result;
VoodooInstanceID instance;
};
typedef struct {
int magic;
const char *msg;
const char *ptr;
} VoodooMessageParser;
#define __VOODOO_PARSER_PROLOG( parser, req_type ) \
const char *_vp_ptr; \
VoodooMessageBlockType _vp_type; \
int _vp_length; \
VoodooMessageParser *_parser = &parser; \
\
D_MAGIC_ASSERT( _parser, VoodooMessageParser ); \
\
(void)_vp_type; \
\
_vp_ptr = _parser->ptr; \
\
/* Read message block type. */ \
_vp_type = *(const VoodooMessageBlockType*) _vp_ptr; \
\
D_ASSERT( _vp_type == (req_type) ); \
\
/* Read data block length. */ \
_vp_length = *(const s32*) (_vp_ptr + 4)
#define __VOODOO_PARSER_EPILOG( parser ) \
/* Advance message data pointer. */ \
_parser->ptr += 8 + VOODOO_MSG_ALIGN(_vp_length)
#define VOODOO_PARSER_BEGIN( parser, message ) \
do { \
const VoodooMessageHeader *_vp_header = (const VoodooMessageHeader *) (message); \
VoodooMessageParser *_parser = &parser; \
\
D_ASSERT( (message) != NULL ); \
D_ASSERT( _vp_header->type == VMSG_REQUEST || _vp_header->type == VMSG_RESPONSE ); \
\
_parser->msg = (const char*)(message); \
_parser->ptr = _parser->msg + (_vp_header->type == VMSG_REQUEST ? \
sizeof(VoodooRequestMessage) : sizeof(VoodooResponseMessage)); \
\
D_MAGIC_SET_ONLY( _parser, VoodooMessageParser ); \
} while (0)
#define VOODOO_PARSER_GET_ID( parser, ret_id ) \
do { \
__VOODOO_PARSER_PROLOG( parser, VMBT_ID ); \
\
D_ASSERT( _vp_length == 4 ); \
\
/* Read the ID. */ \
(ret_id) = *(const u32*) (_vp_ptr + 8); \
\
__VOODOO_PARSER_EPILOG( parser ); \
} while (0)
#define VOODOO_PARSER_GET_INT( parser, ret_int ) \
do { \
__VOODOO_PARSER_PROLOG( parser, VMBT_INT ); \
\
D_ASSERT( _vp_length == 4 ); \
\
/* Read the integer. */ \
(ret_int) = *(const s32*) (_vp_ptr + 8); \
\
__VOODOO_PARSER_EPILOG( parser ); \
} while (0)
#define VOODOO_PARSER_GET_UINT( parser, ret_uint ) \
do { \
__VOODOO_PARSER_PROLOG( parser, VMBT_UINT ); \
\
D_ASSERT( _vp_length == 4 ); \
\
/* Read the unsigned integer. */ \
(ret_uint) = *(const u32*) (_vp_ptr + 8); \
\
__VOODOO_PARSER_EPILOG( parser ); \
} while (0)
#define VOODOO_PARSER_GET_DATA( parser, ret_data ) \
do { \
__VOODOO_PARSER_PROLOG( parser, VMBT_DATA ); \
\
/*D_ASSERT( _vp_length > 0 );*/ \
\
/* Return pointer to data. */ \
(ret_data) = (__typeof__(ret_data))(_vp_ptr + 8); \
\
__VOODOO_PARSER_EPILOG( parser ); \
} while (0)
#define VOODOO_PARSER_READ_DATA( parser, dst, max_len ) \
do { \
__VOODOO_PARSER_PROLOG( parser, VMBT_DATA ); \
\
/*D_ASSERT( _vp_length > 0 );*/ \
D_ASSERT( _vp_length <= max_len ); \
\
/* Copy data block. */ \
direct_memcpy( (dst), _vp_ptr + 8, _vp_length ); \
\
__VOODOO_PARSER_EPILOG( parser ); \
} while (0)
#define VOODOO_PARSER_COPY_DATA( parser, ret_data ) \
do { \
__VOODOO_PARSER_PROLOG( parser, VMBT_DATA ); \
\
/*D_ASSERT( _vp_length > 0 );*/ \
\
/* Allocate memory on the stack. */ \
(ret_data) = alloca( _vp_length ); \
\
/* Copy data block. */ \
direct_memcpy( (ret_data), _vp_ptr + 8, _vp_length ); \
\
__VOODOO_PARSER_EPILOG( parser ); \
} while (0)
#define VOODOO_PARSER_GET_ODATA( parser, ret_data ) \
do { \
__VOODOO_PARSER_PROLOG( parser, VMBT_ODATA ); \
\
D_ASSERT( _vp_length >= 0 ); \
\
/* Return pointer to data or NULL. */ \
if (_vp_length) \
(ret_data) = (__typeof__(ret_data))(_vp_ptr + 8); \
else \
(ret_data) = NULL; \
\
__VOODOO_PARSER_EPILOG( parser ); \
} while (0)
#define VOODOO_PARSER_GET_STRING( parser, ret_string ) \
do { \
__VOODOO_PARSER_PROLOG( parser, VMBT_STRING ); \
\
D_ASSERT( _vp_length > 0 ); \
\
/* Return pointer to string. */ \
(ret_string) = (const char*) (_vp_ptr + 8); \
\
__VOODOO_PARSER_EPILOG( parser ); \
} while (0)
#define VOODOO_PARSER_END( parser ) \
do { \
VoodooMessageParser *_parser = &parser; \
\
D_MAGIC_ASSERT( _parser, VoodooMessageParser ); \
\
D_ASSUME( *(const u32*) (_parser->ptr) == VMBT_NONE ); \
\
D_MAGIC_CLEAR( _parser ); \
} while (0)
#endif
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