144 lines
6.4 KiB
C
144 lines
6.4 KiB
C
/*****************************************************************************
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* *
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* BF.H *
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* *
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* Copyright (C) Microsoft Corporation 1990. *
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* All Rights reserved. *
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* *
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******************************************************************************
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* *
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* Module Intent *
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* This module implements generic buffers that can expand to any size. *
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* *
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******************************************************************************
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* *
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* Testing Notes *
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* *
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******************************************************************************
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* *
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* Current Owner: *
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* *
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******************************************************************************
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* *
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* Released by Development: (date) *
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* *
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*****************************************************************************/
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/*****************************************************************************
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* *
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* Defines *
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* *
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*****************************************************************************/
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#ifndef __BFNEW_H__ // {
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#define __BFNEW_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define MINIMUM_ADD 0x100 // our threshold for small amounts
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// String buffer
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#define CALC_LENGTH ((WORD)0xffff)
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/*****************************************************************************
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* *
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* Typedefs *
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* *
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*****************************************************************************/
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/* Structure for a generic, expandable buffer. */
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typedef struct
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{
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HANDLE hnd;
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DWORD cIncr;
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HANDLE hBuf;
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DWORD cbSize; /* Number of bytes currently in buffer */
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DWORD cbMax; /* Amount allocated in qvBuffer */
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LPVOID qBuffer;
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} BF, FAR * LPBF, FAR * LPSB; // a string buffer is a special case of a buffer
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/*****************************************************************************
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* *
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* Static Variables *
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* *
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*****************************************************************************/
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/*****************************************************************************
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* *
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* Prototypes *
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* *
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*****************************************************************************/
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/* Generic buffer interface */
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#define DynBufferPtr(lpbf) ((LPBYTE)((lpbf)->qBuffer))
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#define DynBufferLen(lpbf) ((lpbf)->cbSize)
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#define DynBufferEmpty(lpbf) ((lpbf)->cbSize == 0)
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#define DynBufferReset(lpbf) (MEMSET((lpbf)->qBuffer, 0, (lpbf)->cbSize), ((lpbf)->cbSize = 0))
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#define DynBufferSetLength(lpbf, w) (((w) > (lpbf)->cbSize) ? DynBufferEnsureAdd(lpbf, (w) - (lpbf)->cbSize), ((lpbf)->cbSize = (w)) : ((lpbf)->cbSize = (w)))
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#define DynBufferGetHandle(lpbf) ((lpbf)->hBuf)
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#define DynBufferNullifyHandle(lpbf) ((lpbf)->hBuf = NULL)
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#define DynBufferEnsureAdd(lpbf, w) (((lpbf)->cbSize + (w) <= (lpbf)->cbMax) ? TRUE : InternalEnsureAdd(lpbf, w))
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LPBF DynBufferAlloc(DWORD cbIncr);
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LPBYTE DynBufferAppend(LPBF, LPBYTE, DWORD);
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LPBYTE DynBufferInsert(LPBF lpbf, DWORD lib, LPBYTE qbData, SHORT cbData);
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BOOL InternalEnsureAdd(LPBF, DWORD);
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// Use these to append small amounts quickly, but since this doesn't check for
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// overflow, the caller has to check this themselves if appropriate
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#ifdef _DEBUG
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#define Xassert(x) assert(x)
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#else
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#define Xassert(x) 0
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#endif
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#define DynBufferAppendByte(lpbf, b) \
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(\
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*(((QB)(lpbf)->qBuffer) + (lpbf)->cbSize) = (b), \
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(lpbf)->cbSize++, \
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Xassert((lpbf)->cbSize <= (lpbf)->cbMax), \
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(lpbf)->qBuffer \
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)
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#define DynBufferAppendWord(lpbf, w) \
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(\
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*(LPWORD)(((QB)(lpbf)->qBuffer) + (lpbf)->cbSize) = (w), \
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(lpbf)->cbSize += 2, \
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Xassert((lpbf)->cbSize <= (lpbf)->cbMax), \
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(lpbf)->qBuffer \
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)
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#define DynBufferAppendDword(lpbf, dw) \
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(\
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*(LPDWORD)(((QB)(lpbf)->qBuffer) + (lpbf)->cbSize) = (dw), \
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(lpbf)->cbSize += 4, \
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Xassert((lpbf)->cbSize <= (lpbf)->cbMax), \
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(lpbf)->qBuffer \
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)
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#define DynBufferPeekByte(lpbf, lich, lpb) (((lich) >= 0 && (lich) < (lpbf)->cbSize) ? \
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(*(lpb) = *(((QB)(lpbf)->qBuffer) + (lich))), 1 : 0)
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#define DynBufferUngetByte(lpbf, lpb) (((lpbf)->cbSize > 0) ? \
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(--(lpbf)->cbSize, *(lpb) = *(((QB)(lpbf)->qBuffer) + (lpbf)->cbSize)), 1 : 0)
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#define DynBufferUngetWord(lpbf, lpw) (((lpbf)->cbSize > 1) ? \
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((lpbf)->cbSize -= 2, *(lpw) = *(LPWORD)(((QB)(lpbf)->qBuffer) + (lpbf)->cbSize)), 2 : 0)
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VOID DynBufferFree(LPBF lpbf);
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#define DynBufferGrow(lpbf, w) DynBufferAppend(lpbf, NULL, w)
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#ifdef _UNICODE
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#define DynBufferAppendChar(lpbf, ch) DynBufferAppendWord(lpbf, (WORD)ch)
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#else
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#define DynBufferAppendChar(lpbf, ch) DynBufferAppendByte(lpbf, (BYTE)ch)
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif // __BFNEW_H__ }
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