haiku/headers/private/app/LinkMsgReader.h

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//------------------------------------------------------------------------------
// Copyright (c) 2001-2002, Haiku
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
// File Name: LinkMsgReader.h
// Author: DarkWyrm <bpmagic@columbus.rr.com>
// Pahtz <pahtz@yahoo.com.au>
// Description: Class for receiving low-overhead port-based messages
//
//------------------------------------------------------------------------------
#ifndef _LINKMSGREADER_H
#define _LINKMSGREADER_H
#include <OS.h>
class LinkMsgReader
{
public:
LinkMsgReader(port_id port);
virtual ~LinkMsgReader(void);
virtual void SetPort(port_id port);
virtual port_id GetPort(void);
virtual status_t GetNextMessage(int32 *code, bigtime_t timeout = B_INFINITE_TIMEOUT);
virtual status_t Read(void *data, ssize_t size);
virtual status_t ReadString(char **string);
template <class Type> status_t Read(Type *data)
{
return Read(data, sizeof(Type));
}
protected:
virtual status_t ReadFromPort(bigtime_t timeout);
virtual status_t AdjustReplyBuffer(bigtime_t timeout);
void ResetBuffer();
port_id fReceivePort;
char *fRecvBuffer;
int32 fRecvPosition; //current read position
int32 fRecvStart; //start of current message
int32 fRecvBufferSize;
int32 fDataSize; //size of data in recv buffer
int32 fReplySize; //size of current reply message
status_t fReadError; //Read failed for current message
};
#endif