decomp.h

[随书类]Dos6.0源代码

/*******************************************************************
*****  Header for Decompression Library (condensed from API.H and RETCODES.H)
********************************************************************/

/*** API.H:  Extern procs for the decompression library. ***/

#ifndef WIN32
typedef int  SHORT;    // defined elsewhere for WIN32 version
typedef char CHAR;     // defined elsewhere for WIN32 version
#endif

typedef int (far * PFNWFROMW)(int);


extern BOOL FTerminateDecomp(void);


  /* procedures in SUDECOMP.LIB */
extern  SHORT   far  WReadHeaderInfo(int fhSrc);
extern  BOOL    far  FFreeHeaderInfo(void);
extern  LONG    far  LcbDecompFile(int fhSrc, int fhDest, LONG lcbDestMax,
                           LONG libStart, BOOL fHeaderAlreadyRead,
						   BYTE far * fpbBuf, LONG lcbBuf, PFNWFROMW pfn,
						   int cProgTicks, PFNWFROMW pfnYield);
extern  LONG    far  LcbDecompressToFile(int fhSrc, int fhDest, LONG lcbDestMax,
                           LONG libStart, BOOL fHeaderAlreadyRead);
extern  LONG    far  LcbDecompressToBuffer(int fhSrc, BYTE far * fpbBuf,
                           LONG lcbBuf, LONG libStart, BOOL fHeaderAlreadyRead);
extern  LONG    far  LcbCalculateDecompressedLength(int fhSrc,
                           BOOL fHeaderAlreadyRead);

  /* global variables for file header info before writing or after reading */
extern  SHORT   vwAlgType;
extern  LONG    vlcbSrcLength;
extern  BOOL    vfChecksum;
extern  USHORT  vusChecksum;
extern  USHORT  vcbArgs;
extern  BYTE *  vrgbArgs;
extern  CHAR    vszBaseName[9];
extern  CHAR    vszExtension[4];
extern  SZ      vszText;
extern  USHORT  vcbText;



/*** RETCODES.H:  Return Codes for compression module for Setup Toolkit. ***/

 
  /* error codes - quick check is anything less than rcNoError */
#define  rcNoError                 0     /* no errors */
#define  rcNoHeader              (-1)    /* no header (eg no magic value) */
#define  rcUnknownAlgType        (-2)    /* wAlgType doesn't match knowns */
#define  rcBadHeader             (-3)    /* header too short or bad value */
#define  rcFilenamesTooLong      (-4)    /* filenames bigger than 8.3 */

#define  rcReadError             (-5)    /* reading error with fhSrc */
#define  rcReadSeekError         (-6)    /* seeking error with fhSrc */

#define  rcWriteError            (-7)    /* writing error with fhDest */
#define  rcWriteSeekError        (-8)    /* seeking error with fhDest */
#define  rcDestPatchError        (-9)    /* patching error with fhDest */

#define  rcCompChecksumBad      (-10)    /* compressed checksums mismatch */
#define  rcDecompChecksumBad    (-11)    /* decompressed checksums mismatch */
#define  rcCompLengthBad        (-12)    /* compressed length mismatch */
#define  rcDecompLengthBad      (-13)    /* decompressed length mismatch */

#define  rcGenericCompError     (-14)    /* internal compression error */
#define  rcGenericDecompError   (-15)    /* internal decompression error */

#define  rcSplitSizeTooSmall    (-16)    /* split size too small for header */

#define  rcOutOfMemory          (-17)    /* unable to alloc a buffer */


  /* each code below here has a standard header */
#define  wAlgTypeNil             (-1)    /* no algorithm type (never found) */
#define  wAlgTypeZK1               2     /* Steve Zeck compression algorithm */
#define  wAlgTypeJJJ1              3     /* Jeff J. Johnson algorithm */