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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [rtems_webserver/] [wbase64.c] - Blame information for rev 173

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1 30 unneback 
/*
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 * base64.c -- Base64 Mime encoding
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 *
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 * Copyright (c) Go Ahead Software Inc., 1995-1999. All Rights Reserved.
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 *
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 * See the file "license.txt" for usage and redistribution license requirements
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 */
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9 
/******************************** Description *********************************/
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/*
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 *      The base64 command encodes and decodes a string in mime base64 format
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 */
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/********************************* Includes ***********************************/
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#include        "wsIntrn.h"
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/******************************** Local Data **********************************/
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/*
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 *      Mapping of ANSI chars to base64 Mime encoding alphabet (see below)
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 */
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static char_t   map64[] = {
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        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
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        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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        52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
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        -1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
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    15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
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        -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
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    41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1,
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        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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};
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static char_t   alphabet64[] = {
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        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
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        'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
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        'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
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        'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
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        'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
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        'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
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        'w', 'x', 'y', 'z', '0', '1', '2', '3',
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        '4', '5', '6', '7', '8', '9', '+', '/',
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};
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/*********************************** Code *************************************/
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/*
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 *      Decode a buffer from "string" and into "outbuf"
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 */
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int websDecode64(char_t* outbuf, char_t* string, int outlen)
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{
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        unsigned long   shiftbuf;
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        char_t*                 cp;
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        char_t*                 op;
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        int                             c, i, j, shift;
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        op = outbuf;
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        *op = '\0';
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        cp = string;
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        while (*cp && *cp != '=') {
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/*
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 *              Map 4 (6bit) input bytes and store in a single long (shiftbuf)
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 */
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                shiftbuf = 0;
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                shift = 18;
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                for (i = 0; i < 4 && *cp && *cp != '='; i++, cp++) {
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                        c = map64[*cp & 0xff];
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                        if (c == -1) {
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                                error(E_L, E_LOG, T("Bad string: %s at %c index %d"), string,
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                                        c, i);
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                                return -1;
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                        }
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                        shiftbuf = shiftbuf | (c << shift);
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                        shift -= 6;
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                }
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/*
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 *              Interpret as 3 normal 8 bit bytes (fill in reverse order).
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 *              Check for potential buffer overflow before filling.
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 */
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                --i;
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                if ((op + i) >= &outbuf[outlen]) {
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                        gstrcpy(outbuf, T("String too big"));
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                        return -1;
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                }
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                for (j = 0; j < i; j++) {
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                        *op++ = (char_t) ((shiftbuf >> (8 * (2 - j))) & 0xff);
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                }
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                *op = '\0';
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        }
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        return 0;
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}
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/******************************************************************************/
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/*
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 *      Encode a buffer from "string" into "outbuf"
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 */
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void websEncode64(char_t* outbuf, char_t* string, int outlen)
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{
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        unsigned long   shiftbuf;
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        char_t*                 cp;
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        char_t*                 op;
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        int                             x, i, j, shift;
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        op = outbuf;
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        *op = '\0';
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        cp = string;
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        while (*cp) {
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/*
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 *              Take three characters and create a 24 bit number in shiftbuf
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 */
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                shiftbuf = 0;
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                for (j = 2; j >= 0 && *cp; j--, cp++) {
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                        shiftbuf |= ((*cp & 0xff) << (j * 8));
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                }
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/*
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 *              Now convert shiftbuf to 4 base64 letters.  The i,j magic calculates
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 *              how many letters need to be output.
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 */
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                shift = 18;
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                for (i = ++j; i < 4 && op < &outbuf[outlen] ; i++) {
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                        x = (shiftbuf >> shift) & 0x3f;
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                        *op++ = alphabet64[(shiftbuf >> shift) & 0x3f];
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                        shift -= 6;
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                }
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/*
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 *              Pad at the end with '='
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 */
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                while (j-- > 0) {
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                        *op++ = '=';
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                }
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                *op = '\0';
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        }
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}
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/******************************************************************************/

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