77 lines
1.5 KiB
C
77 lines
1.5 KiB
C
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/*
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** Copyright 1998 - 1999 Double Precision, Inc. See COPYING for
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** distribution information.
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*/
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/*
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** $Id$
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*/
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#include "rfc2045.h"
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static unsigned char base64buf[57];
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/* When encoded this becomes 76 characters */
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static int base64cnt;
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static void (*output_func)(const char *, size_t);
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void rfc2045_base64encode_start( void (*func)(const char *, size_t))
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{
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output_func=func;
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base64cnt=0;
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}
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void rfc2045_base64encode(const char *buf, size_t n)
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{
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while (n)
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{
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size_t i;
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if (base64cnt == sizeof(base64buf))
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{
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rfc2045_base64encode_end();
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base64cnt=0;
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}
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i=n;
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if (i > sizeof(base64buf) - base64cnt)
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i=sizeof(base64buf) - base64cnt;
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memcpy(base64buf + base64cnt, buf, i);
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base64cnt += i;
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buf += i;
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n -= i;
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}
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}
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static const char base64tab[]=
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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void rfc2045_base64encode_end()
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{
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int a=0,b=0,c=0;
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int i, j;
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int d, e, f, g;
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char output_buf[ sizeof(base64buf) / 3 * 4+1];
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if (base64cnt == 0) return;
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for (j=i=0; i<base64cnt; i += 3)
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{
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a=base64buf[i];
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b= i+1 < base64cnt ? base64buf[i+1]:0;
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c= i+2 < base64cnt ? base64buf[i+2]:0;
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d=base64tab[ a >> 2 ];
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e=base64tab[ ((a & 3 ) << 4) | (b >> 4)];
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f=base64tab[ ((b & 15) << 2) | (c >> 6)];
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g=base64tab[ c & 63 ];
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if (i + 1 >= base64cnt) f='=';
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if (i + 2 >= base64cnt) g='=';
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output_buf[j++]=d;
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output_buf[j++]=e;
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output_buf[j++]=f;
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output_buf[j++]=g;
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}
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output_buf[j++]='\n';
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(*output_func)(output_buf, j);
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}
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