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Annotation of pgp/src/zfile_io.c, revision 1.1

1.1     ! root        1: /*---------------------------------------------------------------------------
        !             2: 
        !             3:   file_io.c
        !             4: 
        !             5:   This file contains routines for doing direct input/output, file-related
        !             6:   sorts of things.  Most of the system-specific code for unzip is contained
        !             7:   here, including the non-echoing password code for decryption (bottom).
        !             8: 
        !             9:   Modified: 24 Jun 92 - HAJK
        !            10:   Fix VMS support
        !            11:   ---------------------------------------------------------------------------*/
        !            12: 
        !            13: 
        !            14: #include "zunzip.h"
        !            15: 
        !            16: /****************************/
        !            17: /* Function FillBitBuffer() */
        !            18: /****************************/
        !            19: 
        !            20: int FillBitBuffer()
        !            21: {
        !            22:     /*
        !            23:      * Fill bitbuf, which is 32 bits.  This function is only used by the
        !            24:      * READBIT and PEEKBIT macros (which are used by all of the uncompression
        !            25:      * routines).
        !            26:      */
        !            27:     UWORD temp;
        !            28: 
        !            29:     zipeof = 1;
        !            30:     while (bits_left < 25 && ReadByte(&temp) == 8)
        !            31:     {
        !            32:       bitbuf |= (ULONG)temp << bits_left;
        !            33:       bits_left += 8;
        !            34:       zipeof = 0;
        !            35:     }
        !            36:     return 0;
        !            37: }
        !            38: 
        !            39: /***********************/
        !            40: /* Function ReadByte() */
        !            41: /***********************/
        !            42: 
        !            43: int ReadByte(x)
        !            44: UWORD *x;
        !            45: {
        !            46:     /*
        !            47:      * read a byte; return 8 if byte available, 0 if not
        !            48:      */
        !            49: 
        !            50: 
        !            51:     if (csize-- <= 0)
        !            52:         return 0;
        !            53: 
        !            54:     if (incnt == 0) {
        !            55:         if ((incnt = read(zipfd, inbuf, INBUFSIZ)) <= 0)
        !            56:             return 0;
        !            57:         /* buffer ALWAYS starts on a block boundary:  */
        !            58:         inptr = inbuf;
        !            59:     }
        !            60:     *x = *inptr++;
        !            61:     --incnt;
        !            62:     return 8;
        !            63: }
        !            64: 
        !            65: 
        !            66: /**************************/
        !            67: /* Function FlushOutput() */
        !            68: /**************************/
        !            69: 
        !            70: int FlushOutput()
        !            71: {
        !            72:     /*
        !            73:      * flush contents of output buffer; return PK-type error code
        !            74:      */
        !            75:     int len;
        !            76: 
        !            77:     if (outcnt) {
        !            78:                        len = outcnt;
        !            79:             if (write(outfd, outout, len) != len)
        !            80: #ifdef MINIX
        !            81:                 if (errno == EFBIG)
        !            82:                     if (write(fd, outout, len/2) != len/2  ||
        !            83:                         write(fd, outout+len/2, len/2) != len/2)
        !            84: #endif /* MINIX */
        !            85:                 {
        !            86:                     return 50;    /* 50:  disk full */
        !            87:                 }
        !            88:         outpos += outcnt;
        !            89:         outcnt = 0;
        !            90:         outptr = outbuf;
        !            91:     }
        !            92:     return (0);                 /* 0:  no error */
        !            93: }

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