mirror of
https://github.com/sheumann/VNCviewGS.git
synced 2024-11-22 02:30:47 +00:00
133 lines
3.6 KiB
C++
133 lines
3.6 KiB
C++
#if __ORCAC__
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#pragma lint -1
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#pragma noroot
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segment "VNCview GS";
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#endif
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#include <tcpip.h>
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#include <memory.h>
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#include <event.h>
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#include <orca.h>
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#include "readtcp.h"
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#include "vncsession.h"
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#define buffTypePointer 0x0000 /* For TCPIPReadTCP() */
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#define buffTypeHandle 0x0001
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#define buffTypeNewHandle 0x0002
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unsigned char *readBufferPtr; /* Ptr to data read by last DoReadTCP call. */
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void ** readBufferHndl; /* User internally by TCP read routines. */
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static unsigned int tcperr;
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/* Read data, waiting for up to 15 seconds for the data to be ready */
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BOOLEAN DoWaitingReadTCP(unsigned long dataLength) {
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unsigned long stopTime;
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BOOLEAN result = FALSE;
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stopTime = TickCount() + 15 * 60;
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do {
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result = DoReadTCP(dataLength);
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} while (result == FALSE && tcperr == tcperrOK && TickCount() < stopTime);
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return result;
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}
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/* Fix things when TCPIPReadTCP returns less data than it's supposed to */
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static BOOLEAN ReadFixup (unsigned long requested, unsigned long returned) {
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static rrBuff theRRBuff;
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SetHandleSize(requested, readBufferHndl);
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if (toolerror())
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return FALSE;
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HLock(readBufferHndl);
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do {
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TCPIPPoll();
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if ((tcperr = TCPIPReadTCP(hostIpid, buffTypeNewHandle, NULL,
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requested-returned, &theRRBuff)) != tcperrOK)
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return FALSE;
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if (toolerror())
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return FALSE;
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if (theRRBuff.rrBuffCount == 0) /* To avoid infinite loops */
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return FALSE;
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HandToPtr(theRRBuff.rrBuffHandle, (char *)*readBufferHndl + returned,
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theRRBuff.rrBuffCount);
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returned += theRRBuff.rrBuffCount;
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DisposeHandle(theRRBuff.rrBuffHandle);
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} while (returned < requested);
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readBufferPtr = *readBufferHndl;
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return TRUE;
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}
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/**********************************************************************
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* DoReadTCP() - Issue TCPIPReadTCP() call w/ appropriate parameters
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* Return value = did the read succeed?
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**********************************************************************/
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BOOLEAN DoReadTCP (unsigned long dataLength) {
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static srBuff theSRBuff;
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static rrBuff theRRBuff;
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if (dataLength == 0)
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return TRUE;
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DoneWithReadBuffer();
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TCPIPPoll();
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if ((tcperr = TCPIPStatusTCP(hostIpid, &theSRBuff)) != tcperrOK)
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return FALSE;
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if (toolerror())
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return FALSE;
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if (theSRBuff.srRcvQueued < dataLength)
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return FALSE;
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if ((tcperr = TCPIPReadTCP(hostIpid, buffTypeNewHandle, NULL,
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dataLength, &theRRBuff)) != tcperrOK)
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return FALSE;
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if (toolerror())
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return FALSE;
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if (theRRBuff.rrBuffCount == 0)
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return FALSE;
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readBufferHndl = theRRBuff.rrBuffHandle;
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if (theRRBuff.rrBuffCount != dataLength)
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return ReadFixup(dataLength, theRRBuff.rrBuffCount);
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HLock(readBufferHndl);
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readBufferPtr = *readBufferHndl;
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return TRUE;
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}
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/**********************************************************************
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* DoReadMultipleTCP() - Read the largest available multiple of recLen bytes,
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* up to a maximum multiple of maxN.
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* Return value = the multiple n (meaning n * len bytes have been read)
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**********************************************************************/
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unsigned DoReadMultipleTCP(unsigned recLen, unsigned maxN) {
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static srBuff theSRBuff;
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unsigned long n, totalSize;
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TCPIPPoll();
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if ((tcperr = TCPIPStatusTCP(hostIpid, &theSRBuff)) != tcperrOK)
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return 0;
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if (toolerror())
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return 0;
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n = theSRBuff.srRcvQueued / recLen;
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if (n > maxN)
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n = maxN;
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if (n && DoReadTCP(recLen * n))
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return n;
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return 0;
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}
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