105 lines
4.3 KiB
C
105 lines
4.3 KiB
C
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/*****************************************************************************
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* *
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* ZECK.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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* *
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* Zeck compression routines for bitmaps & topic 2K blocks.
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* *
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*****************************************************************************/
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// This structure is passed to the compression routine to specify ranges
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// in which to suppress compression:
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#ifndef __ZECK_H__
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#define __ZECK_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "misc.h"
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typedef struct struct_suppresszeck SUPPRESSZECK, FAR *QSUPPRESSZECK;
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struct struct_suppresszeck {
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RB rbSuppress; // beginning of range for suppression.
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WORD cbSuppress; // number of bytes to suppress compression.
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RB rbNewpos; // pointer into dest buffer where suppressed range
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// ended up after compression (an OUT param value).
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WORD iBitdex; // offset from rbNewpos of zeck code bits, used when
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// back patching.
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QSUPPRESSZECK next; // next suppression range in this list.
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};
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#define BITDEX_NONE ((WORD)-1) // indicates no compression took place, and
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// backpatch should not adjust for the
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// code bits.
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/* LcbCompressZeck -
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*
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* This is the only entry point into zeck compression. Compresses 'cbSrc'
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* bytes at 'rbSrc' into the buffer at 'rbDest', suppressing compression
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* for bytes specified by the qSuppress linked list.
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*
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* rbSrc - IN far pointer to source buffer.
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* rbDest- IN far pointer to dest buffer.
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* cbSrc - IN count of bytes to be compressed.
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* cbDest- IN limit count of bytes to put in rbDest - used to create
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* the 2K topic blocks.
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* qulSrcUsed- OUT count of src bytes compressed into rbDest (needed when
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* a cbDest limit is used).
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* qSuppress IN OUT linked list of compression suppression specifiers,
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* the out value is where the suppression ranges ended
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* up in the rbDest buffer.
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*
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* RETURNS: length of compressed data put in rbDest, 0 for error.
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*/
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#define COMPRESS_CBNONE 0 // passed as cbDest when no limit is to apply.
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#define COMPRESS_SUPPRESSNIL NULL // passed as qSuppress when no
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// suppression is desired
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ULONG FAR PASCAL LcbCompressZeck( QB rbSrc, QB rbDest, ULONG cbSrc,
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ULONG cbDest, QUL qulSrcUsed, QSUPPRESSZECK qSuppress, LPVOID
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lperrb);
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BOOL FAR PASCAL FAllocateZeckGlobals( void );
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void FAR PASCAL FreeZeckGlobals( void );
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ULONG PASCAL FAR LcbSimpleCompressZeck(RB rbSrc, RB rbDest,
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ULONG cbSrc, LPVOID lperrb);
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VOID FAR PASCAL VMemBackpatchZeck( QSUPPRESSZECK qsuppresszeck,
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ULONG ulOffset, ULONG ulValue );
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// erinfox: comment out so we don't need def. for HF
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//BOOL FAR PASCAL FDiskBackpatchZeck( HF hf, ULONG fcl, ULONG ulOffset,
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// WORD iBitdex, ULONG ulValue, BOOL fSaveLoc, LPVOID lperrb );
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ULONG FAR PASCAL LcbUncompressZeck( RB rbSrc, RB rbDest, ULONG cbSrc,
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ULONG cbDest);
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/***********************************************************************
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MATTSMI 4/17/92 -- CALLBACK DEFNS PUT HERE SO THAT THE WMVC COMPILER CAN
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GET STATUS INFORMATION DURING COMPRESSION
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************************************************************************/
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typedef BOOL (FAR PASCAL * lpfnPumpMessageQueue)(VOID);
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typedef VOID (FAR PASCAL * lpfnPrintStatusMessage)(LPSTR);
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typedef VOID (FAR PASCAL * lpfnMessageGetPutFunc)(VOID);
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#ifdef __cplusplus
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}
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#endif
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#endif // __ZECK_H__
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