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81 lines
2.8 KiB
C
81 lines
2.8 KiB
C
/*********************************************************************\
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LICENCE: Copyright (c) 2001 Bob Trower, Trantor Standard Systems Inc.
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated
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documentation files (the "Software"), to deal in the
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Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute,
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sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so,
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subject to the following conditions:
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The above copyright notice and this permission notice shall
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be included in all copies or substantial portions of the
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Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
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KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
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OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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VERSION HISTORY:
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Bob Trower 08/04/01 -- Create Version 0.00.00B
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\******************************************************************* */
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#include <stdlib.h>
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/*
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** Translation Table as described in RFC1113
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*/
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static const char cb64[]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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/*
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** encodeblock
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**
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** encode 3 8-bit binary bytes as 4 '6-bit' characters
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*/
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void encodeblock(unsigned char in[3], unsigned char out[4], int len) {
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out[0] = cb64[ in[0] >> 2 ];
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out[1] = cb64[ ((in[0] & 0x03) << 4) | ((in[1] & 0xf0) >> 4) ];
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out[2] = (unsigned char) (len > 1 ? cb64[ ((in[1] & 0x0f) << 2) | ((in[2] & 0xc0) >> 6) ] : '=');
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out[3] = (unsigned char) (len > 2 ? cb64[ in[2] & 0x3f ] : '=');
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}
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/*
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** encode
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**
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** base64 encode a stream adding padding and line breaks as per spec.
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*/
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unsigned int base64(unsigned char *inbuf, unsigned int len, unsigned char *outbuf) {
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unsigned char in[3], out[4];
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int c;
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unsigned int i = 0;
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unsigned int outlen = 0;
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while (i < len) {
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int n = 0;
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for(c = 0; c < 3; c++, i++) {
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if (i < len) {
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in[c] = inbuf[i];
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n++;
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}
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else {
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in[c] = 0;
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}
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}
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if (n) {
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encodeblock(in, out, n);
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for(c = 0; c < 4; c++) {
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outbuf[outlen++] = out[c];
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}
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}
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}
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return outlen;
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}
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