Fresh Fish 9/FreshFishVol9-CD2.bin/bbs/util/uucode-36.9.lha/UUCode/uuencode.c

Text File | 1994-09-28 | 5KB | 186 lines

/*
 * $Id: uuencode.c,v 36.9 1994/09/28 15:03:59 zodiac Rel zodiac $
 *
 * uuencode 36.9 -- Copyright (c) 1994 Ralph Seichter.
 *
 * Encodes binary files so that they can be posted to the Internet. This
 * tool is pure.
 *
 * This tool is FREELY DISTRIBUTABLE. Copying and spreading is encouraged,
 * as long as you don't charge anyone for giving him/her this tool. Please
 * note that the Copyright is mine, this is *NOT* public domain software!
 * Permission is hereby granted to include the complete (!) archive in all
 * non-profit public domain software series like Fred Fish, SaarAG, etc.
 *
 * $Log: uuencode.c,v $
 * Revision 36.9  1994/09/28  15:03:59  zodiac
 * No changes. Revision number was bumped to match uudecode.
 *
 * Revision 36.8  1994/09/28  14:18:47  zodiac
 * First release with 'pure' executables.
 *
 */

#define    VERSION        "\0$VER: uuencode 36.9 (28.9.94)"
#define    TEMPLATE        "FROM/A/M,TO=AS/A/K,NC=NOCHECKSUM/S,XC=XCHECKSUM/S,QUIET/S"

#define    MODE_NOCHKSUM    0x01
#define    MODE_XCHKSUM    0x02
#define    SIXBIT        0x40        /* 6 bit = 0x40 */

enum { ARG_FROM, ARG_TO, ARG_NOCHKSUM, ARG_XCHKSUM, ARG_QUIET, ARG_TOTAL };

/*
    Encoding (c == 0) returns (0x60).
    Encoding (c  > 0) returns ((c & 0x3F) + 0x20).

    There is always (0x20 <= c <= 0x60), which means
    that c is guaranteed to be a printable character!
*/

#define ENCODE(c) (c ? (c & 0x3F) + 0x20 : 0x60)



/* function prototypes and globals ******************************************/

LONG entryPoint (VOID);
BOOL encodeFile (struct DosLibrary *, BPTR, BPTR, STRPTR, BYTE);



/* the main program *********************************************************/

LONG __saveds entryPoint (VOID)
{
    LONG rc = RETURN_FAIL;
    struct DosLibrary *DOSBase;

    /* uuencode will *NOT* run without dos.library V36 or better! */
    if (DOSBase = (struct DosLibrary *)OpenLibrary (DOSNAME, 36))
    {
        LONG err;
        STRPTR arg[ARG_TOTAL];
        struct RDArgs *rda;

        rc = RETURN_ERROR;
        memset (arg, 0, sizeof (arg));
        if (rda = ReadArgs (TEMPLATE, (LONG *)arg, NULL))
        {
            BPTR out;
            STRPTR *name = (STRPTR *)arg[ARG_FROM];
            static UBYTE ver[] = VERSION;

            if (!arg[ARG_QUIET])
                Printf ("%s Copyright \xA9 Ralph Seichter\n", &ver[7]);
            if (out = Open (arg[ARG_TO], MODE_NEWFILE))
            {
                WORD i;
                BPTR in;
                BYTE mode;
                BOOL ok = TRUE;

                if (arg[ARG_NOCHKSUM])
                    mode = MODE_NOCHKSUM;
                else if (arg[ARG_XCHKSUM])
                    mode = MODE_XCHKSUM;
                else
                    mode = 0;
                for (i = 0; ok && (name[i]); ++i)
                    if (in = Open (name[i], MODE_OLDFILE))
                    {
                        if (!arg[ARG_QUIET])
                            Printf ("Encoding file %s\n", name[i]);
                        ok = encodeFile (DOSBase, in, out, FilePart (name[i]), mode);
                        Close (in);
                    }
                Close (out);
                if ((err = IoErr ()) > 0)
                    PrintFault (err, NULL);
                else
                    rc = RETURN_OK;
            }
            FreeArgs (rda);
        }
        CloseLibrary ((struct Library *)DOSBase);
    }
    return (rc);
}



/* encode a complete file ***************************************************/

BOOL encodeFile (struct DosLibrary *DOSBase, BPTR in, BPTR out, STRPTR name, BYTE mode)
{
    BOOL ok = FALSE;

    if (0 < FPrintf (out, "begin 644 %s\n", name))
    {
        LONG n, i, triple, checksum, size = 0;
        UBYTE c, buf[45], outbuf[80];
        STRPTR s, t;

        do
        {
            /* read a maximum of 45 bytes at a time */
            n = FRead (in, buf, 1, 45);
            size += n;

            /* the first byte in each output line is the */
            /* encoded number of encoded bytes in the line */
            s = outbuf;
            *s++ = ENCODE(n);

            /* now encode data in buffer. three input bytes
                    will always result in four output bytes */
            for (checksum = 0, i = 0; i < n; i += 3)
            {
                t = &buf[i];

                /* first six bits (7-2) of byte 0 */
                c = t[0] >> 2;
                *s++ = ENCODE(c);

                /* last two bits (1-0) of byte 0 OR'ed with first
                        four bits (7-4) of byte 1 */
                c = (t[0] << 4) & 0x30 | (t[1] >> 4) & 0x0F;
                *s++ = ENCODE(c);

                /* last four bits (3-0) of byte 1 OR'ed with first
                        two bits (7-6) of byte 2 */
                c = (t[1] << 2) & 0x3C | (t[2] >> 6) & 0x03;
                *s++ = ENCODE(c);

                /* last six bits (5-0) of byte 2 */
                c = t[2] & 0x3F;
                *s++ = ENCODE(c);

                /* calculate checksum of current triplet */
                triple = (t[0] + t[1] + t[2]) % SIXBIT;

                /* and add this to total line checksum */
                checksum = (checksum + triple) % SIXBIT;
            }

            if (mode & MODE_XCHKSUM)
                *s++ = 'X';
            else if (!(mode & MODE_NOCHKSUM))
                /* the last byte in each line is the line checksum */
                *s++ = ENCODE(checksum);

            /* add a newline character and write line string to file */
            *s++ = '\n';
            *s = 0;
            if (0 != FPuts (out, outbuf))
                n = -1;
        }
        while (n > 0);
        if (n != -1)
            ok = (0 < FPrintf (out, "end\nsize %ld\n\n", size));
    }
    return (ok);
}

/* EOF */