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Annotation of ntddk/src/print/lib/hndncopy.c, revision 1.1

1.1     ! root        1: /************************** MODULE HEADER **********************************
        !             2:  * hndcopy.c
        !             3:  *      Module to allow copying of file data using handles.
        !             4:  *
        !             5:  *
        !             6:  * Copyright (C) 1992  Microsoft Corporation
        !             7:  *
        !             8:  ***************************************************************************/
        !             9: 
        !            10: #include        <windows.h>
        !            11: 
        !            12: 
        !            13: /************************** Function Header ********************************
        !            14:  * lFInCopy
        !            15:  *      Copy the file contents of the input handle to that of the output
        !            16:  *      handle.  Copy is limited to the number of bytes passed in.
        !            17:  *
        !            18:  * RETURNS:
        !            19:  *      Number of bytes copied,  -1 on error, 0 is legitimate.
        !            20:  *
        !            21:  * HISTORY:
        !            22:  *  13:20 on Tue 25 Feb 1992    -by-    Lindsay Harris   [lindsayh]
        !            23:  *      Based on lFICopy
        !            24:  *
        !            25:  ***************************************************************************/
        !            26: 
        !            27: 
        !            28: long
        !            29: lFInCopy( hOut, hIn, lCount )
        !            30: HANDLE   hOut;          /* Output file:  write to current position */
        !            31: HANDLE   hIn;           /* Input file: copy from current position to EOF */
        !            32: long     lCount;        /* Number of bytes to copy */
        !            33: {
        !            34: 
        !            35:     /*
        !            36:      *   Simple read/write operations until EOF is reached on the input.
        !            37:      * May also be errors,  so handle these too.  As we are dealing with
        !            38:      * relatively small files (a few 10s of k), we use a stack buffer.
        !            39:      */
        !            40: 
        !            41: #define CPBSZ   2048
        !            42: 
        !            43:     DWORD  dwSize;
        !            44:     DWORD  dwGot;
        !            45:     DWORD  dwTot;               /* Accumulate number of bytes copied */
        !            46:     DWORD  dwLeft;              /* Number of bytes remaining */
        !            47: 
        !            48:     BYTE   ajBuf[ CPBSZ ];
        !            49: 
        !            50:     if( lCount < 0 )
        !            51:         return  0;              /* Can't copy the other direction! */
        !            52: 
        !            53: 
        !            54:     dwTot = 0;
        !            55:     dwLeft = lCount;
        !            56: 
        !            57:     while( dwLeft > 0 )
        !            58:     {
        !            59:         dwSize = dwLeft > CPBSZ ? CPBSZ : dwLeft;
        !            60: 
        !            61:         if( !ReadFile( hIn, &ajBuf, dwSize, &dwGot, NULL ) )
        !            62:             return  -1;                 /* Bad news on error */
        !            63: 
        !            64:         /*  A read of zero means we have reached EOF  */
        !            65: 
        !            66:         if( dwGot == 0 )
        !            67:             return  dwTot;              /* However much so far */
        !            68: 
        !            69:         dwLeft -= dwGot;                /* Adjuest the remainder */
        !            70: 
        !            71:         if( !WriteFile( hOut, &ajBuf, dwGot, &dwSize, NULL ) ||
        !            72:             dwSize != dwGot )
        !            73:         {
        !            74:             /*  Assume some serious problem */
        !            75: 
        !            76:             return  -1;
        !            77:         }
        !            78: 
        !            79:         dwTot += dwSize;
        !            80:     }
        !            81: 
        !            82:     /*
        !            83:      *   We only come here after reading the desired amount.
        !            84:      */
        !            85: 
        !            86:     return  dwTot;
        !            87: }

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