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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* Base64 handlers
*
* Author:
* Miguel de Icaza (miguel@kernel.org)
*/
#include <config.h>
#include "gmime-base64.h"
#define BSIZE 512
/*
* 64-based alphabet used by the the Base64 enconding
*/
static char *base64_alphabet =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
/**
* gmime_encode_base64:
* @input: The data source to be encoded in base64 format
* @output: Where to put the encoded information in.
*
* This routine encodes the information pulled from @input using
* base64 encoding and stores it on the @output CamelStream object
*/
void
gmime_encode_base64 (CamelStream *input, CamelStream *output)
{
char buffer [BSIZE];
char obuf [80]; /* Output is limited to 76 characters, rfc2045 */
int n, i, j, state;
int keep = 0;
state = 0;
j = 0;
while ((n = camel_stream_read (input, buffer, sizeof (buffer))) > 0){
for (i = 0; i < n; i++, state++){
char c = buffer [i];
switch (state % 3){
case 0:
obuf [j++] = base64_alphabet [c >> 2];
keep = (c & 3) << 4;
break;
case 1:
obuf [j++] = base64_alphabet [keep | (c >> 4)];
keep = (c & 0xf) << 2;
break;
case 2:
obuf [j++] = base64_alphabet [keep | (c >> 6)];
obuf [j++] = base64_alphabet [c & 0x3f];
break;
}
if (j == 72){
obuf [j++] = '\r';
obuf [j++] = '\n';
camel_stream_write (output, obuf, j);
j = 0;
}
}
}
switch (state % 3){
case 0:
/* full ouput, nothing left to do */
break;
case 1:
obuf [j++] = base64_alphabet [keep];
obuf [j++] = '=';
obuf [j++] = '=';
break;
case 2:
obuf [j++] = base64_alphabet [keep];
obuf [j++] = '=';
break;
}
camel_stream_write (output, obuf, j);
camel_stream_flush (output);
}
/**
* gmime_decode_base64:
* @input: A buffer in base64 format.
* @output: Destination where the decoded information is stored.
*
* This routine decodes the base64 information pulled from @input
* and stores it on the @output CamelStream object.
*/
void
gmime_decode_base64 (CamelStream *input, CamelStream *output)
{
}
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