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113 lines
3.0 KiB
113 lines
3.0 KiB
/****************************Module*Header******************************\
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* Module Name: unpkbuff.c *
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* *
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* *
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* *
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* Created: 1989 *
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* *
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* Copyright (c) 1987 - 1991 Microsoft Corporation *
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* *
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* A general description of how the module is used goes here. *
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* *
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* Additional information such as restrictions, limitations, or special *
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* algorithms used if they are externally visible or effect proper use *
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* of the module. *
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\***********************************************************************/
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#include <windows.h>
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#include <port1632.h>
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#include <memory.h>
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#include "pbrush.h"
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#define BUFFER_SIZE 1024
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/* file buffer vars. */
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static HANDLE hBuf;
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static LPBYTE pBuf;
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static int iBuf;
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BOOL InitFileBuffer(void)
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{
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if (!(hBuf = LocalAlloc(LHND, BUFFER_SIZE)))
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goto error1;
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if (!(pBuf = LocalLock(hBuf)))
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goto error2;
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iBuf = BUFFER_SIZE;
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return TRUE;
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error2:
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LocalFree(hBuf);
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hBuf = NULL;
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error1:
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return FALSE;
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}
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void DeleteFileBuffer(void)
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{
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if (hBuf) {
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LocalUnlock(hBuf);
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LocalFree(hBuf);
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hBuf = NULL;
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pBuf = NULL;
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}
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}
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BYTE bgetc(HANDLE fh)
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{
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if (iBuf == BUFFER_SIZE) {
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MyByteReadFile(fh, pBuf, BUFFER_SIZE);
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iBuf = 0;
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}
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return pBuf[iBuf++];
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}
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BOOL UnpkBuff(BYTE *buff, int row, DHDR hdr, int nPlanes, HANDLE fh)
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{
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unsigned cntr;
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int i;
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BYTE runChar, runCount;
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BYTE *buffPtr, *endPtr;
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/* upack scan lines and transfer to fileBuff */
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runCount = 0;
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for (i = 0; i < nPlanes; ++i) {
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buffPtr = buff + i * hdr.bplin;
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endPtr = buffPtr + hdr.bplin;
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while (buffPtr < endPtr) {
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if (runCount == 1) {
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*buffPtr++ = runChar;
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runCount--;
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} else {
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cntr = min((unsigned)runCount, (unsigned)(endPtr - buffPtr));
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RepeatFill(buffPtr, runChar, cntr);
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runCount -= (BYTE) cntr;
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buffPtr += cntr;
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}
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if (buffPtr == endPtr)
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break;
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runCount = bgetc(fh);
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if ((runCount & ESCbits) != ESCbits) {
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*buffPtr++ = runCount;
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runCount = 0;
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} else {
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runCount &= ~ESCbits;
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runChar = bgetc(fh);
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}
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}
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}
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/* fill in intensity plane with 1s if we are reading 3 plane file */
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if (nPlanes != hdr.nPlanes)
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RepeatFill(buffPtr, 0xff, hdr.bplin);
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return TRUE;
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}
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