136 lines
2.7 KiB
C++
136 lines
2.7 KiB
C++
/*
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* $Id$
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*
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* Author Jeffrey O. Hill
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* johill@lanl.gov
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* 505 665 1831
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*
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* Experimental Physics and Industrial Control System (EPICS)
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*
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* Copyright 1991, the Regents of the University of California,
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* and the University of Chicago Board of Governors.
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*
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* This software was produced under U.S. Government contracts:
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* (W-7405-ENG-36) at the Los Alamos National Laboratory,
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* and (W-31-109-ENG-38) at Argonne National Laboratory.
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*
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* Initial development by:
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* The Controls and Automation Group (AT-8)
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* Ground Test Accelerator
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* Accelerator Technology Division
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* Los Alamos National Laboratory
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*
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* Co-developed with
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* The Controls and Computing Group
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* Accelerator Systems Division
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* Advanced Photon Source
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* Argonne National Laboratory
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*
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*
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* History
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* $Log$
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*
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*/
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#include<server.h>
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//
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// inBuf::inBuf()
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//
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inBuf::inBuf(casMsgIO &virtualCircuit, osiMutex &mutexIn) :
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mutex(mutexIn),
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io(virtualCircuit)
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{
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assert(&this->io);
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this->bytesInBuffer = 0u;
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this->nextReadIndex = 0u;
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this->bufSize = 0u;
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this->pBuf = NULL;
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}
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//
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// inBuf::init()
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//
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caStatus inBuf::init()
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{
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this->bufSize = io.optimumBufferSize();
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this->pBuf = new char [this->bufSize];
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if (!this->pBuf) {
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this->bufSize = 0u;
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return S_cas_noMemory;
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}
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return S_cas_success;
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}
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//
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// inBuf::~inBuf()
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//
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inBuf::~inBuf()
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{
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if (this->pBuf) {
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delete [] this->pBuf;
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}
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}
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void inBuf::show(unsigned level)
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{
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if (level>1u) {
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printf(
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"\tUnprocessed request bytes = %d\n",
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this->bytesAvailable());
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}
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}
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casFillCondition inBuf::fill()
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{
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unsigned bytesReq;
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unsigned bytesRecv;
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xRecvStatus stat;
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assert(this->pBuf);
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//
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// move back any prexisting data to the start of the buffer
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//
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if (this->nextReadIndex>0u) {
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unsigned unprocessedBytes;
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unprocessedBytes = this->bytesInBuffer - this->nextReadIndex;
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//
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// memmove() handles overlapping buffers
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//
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if (unprocessedBytes>0u) {
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memmove (this->pBuf, this->pBuf+this->nextReadIndex,
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unprocessedBytes);
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}
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this->bytesInBuffer = unprocessedBytes;
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this->nextReadIndex = 0u;
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}
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//
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// noop if the buffer is full
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//
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bytesReq = this->bufSize - this->bytesInBuffer;
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if (bytesReq <= 0u) {
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return casFillFull;
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}
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stat = this->io.xRecv( &this->pBuf[this->bytesInBuffer],
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bytesReq, bytesRecv);
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if (stat != xRecvOK) {
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return casFillDisconnect;
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}
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if (bytesRecv==0u) {
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return casFillNone;
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}
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assert (bytesRecv<=bytesReq);
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this->bytesInBuffer += bytesRecv;
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if (this->bufSize==this->bytesInBuffer) {
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return casFillFull;
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}
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else {
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return casFillPartial;
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}
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}
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