80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
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/*++
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Copyright (C) 1994-2001 Microsoft Corporation
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Module Name:
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MRCICODE.H
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Abstract:
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MRCI 1 & MRCI 2 maxcompress and decompress functions
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History:
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--*/
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#include <setjmp.h>
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#include "corepol.h"
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#define LOGCHASH (13) /* Log of max. no. of hash buckets */
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#define CHASH (1U << LOGCHASH) /* Reasonably large table */
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#define LOGDISPSMALL (6) /* Number of bits in small disp */
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#define LOGDISPMED (8) /* Number of bits in medium disp */
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#define LOGDISPBIG (12) /* Number of bits in big displacement */
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#define MAXDISPSMALL ((1 << LOGDISPSMALL) - 1)
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/* Maximum small displacement */
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#define MAXDISPMED ((1 << LOGDISPMED) + MAXDISPSMALL)
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/* Maximum medium displacement */
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#define MAXDISPBIG ((1 << LOGDISPBIG) + MAXDISPMED)
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/* Maximum big displacement */
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class POLARITY CBaseMrciCompression
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{
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public:
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unsigned int Mrci1MaxCompress(unsigned char *pchbase, unsigned int cchunc,
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unsigned char *pchcmpBase, unsigned int cchcmpMax);
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unsigned Mrci1Decompress(unsigned char *pchin, unsigned cchin,
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unsigned char *pchdecBase, unsigned cchdecMax);
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unsigned Mrci2MaxCompress(unsigned char *pchbase, unsigned cchunc,
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unsigned char *pchcmpBase, unsigned cchcmpMax);
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unsigned Mrci2Decompress(unsigned char *pchin, unsigned cchin,
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unsigned char *pchdecBase, unsigned cchdecMax);
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private:
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/* compression internal functions */
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void inithash(void);
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void charbuf(unsigned c);
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void putbits(unsigned bits, unsigned cbits);
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void outlength(unsigned cb);
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void mrci1outsingle(unsigned ch);
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void mrci1outstring(unsigned disp, unsigned cb);
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void mrci2outsingle(unsigned ch);
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void mrci2outstring(unsigned disp, unsigned cb);
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/* decompression internal functions */
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unsigned getbit(void);
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unsigned getbits(unsigned cbits);
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void expandstring(unsigned char **ppchout, unsigned disp, unsigned cb);
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private:
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unsigned abits; /* Array of bits */
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unsigned cbitsleft; /* Number of bits in abits */
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unsigned char *pCompressed; /* pointer into compressed data */
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unsigned cCompressed; /* # bytes remaining @ pCompressed */
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unsigned ahash[CHASH]; /* Hash table */
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unsigned alink[MAXDISPBIG]; /* Links */
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};
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