Leaked source code of windows server 2003
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/****************************** MODULE HEADER ******************************
* compress.h * Function prototypes and other curiosities associated with data * compression code. * * Copyright (C) 1997 - 1999 Microsoft Corporation. * ****************************************************************************/
//
// this parameter controls how much better (in bytes) a new compression mode
// must do before it will be used instead of the current output mode
#define COMP_FUDGE_FACTOR 4
/*
* TIFF Compression function. */int iCompTIFF( BYTE *, BYTE *, int );
//
// Delta Row Compression function
//
int iCompDeltaRow(BYTE *, BYTE *, BYTE *, int, int);
/*
* Some constants defining the limits of TIFF encoding. The first * represent the minimum number of repeats for which it is worth using * a repeat operation. The other two represent the maximum length * of data that can be encoded in one control byte. */
#define TIFF_MIN_RUN 4 /* Minimum repeats before use RLE */
#define TIFF_MAX_RUN 128 /* Maximum repeats */
#define TIFF_MAX_LITERAL 128 /* Maximum consecutive literal data */
/*
* RLE (Run Length Encoding) functions. */
int iCompRLE( BYTE *, BYTE *, int );int iCompFERLE (BYTE *, BYTE *, int, int );/*
* Some constants relating to RLE operations. RLE is ony useful in * data containing runs. In purely random data, the data size will * double. Consequently, we allow a certain expansion of the data * size before calling it off. A small expansion is OK, since the * there is a cost involved in switching compression on and off. */
#define FERLE_MAX_RUN 255 /* max consecutive byte count */
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