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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include <stdio.h>
#include <string.h>
#include "base64.h"
static const char base64_tab[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
extern "C" size_t base64_encode( FILE *fin, FILE *fout )
{
size_t nLineLength = 0;
size_t nBytesWritten = 0;
size_t nBytes = 0;
do
{
unsigned char in_buffer[3];
memset( in_buffer, 0, sizeof(in_buffer) );
nBytes = fread( in_buffer, 1, sizeof(in_buffer), fin );
if ( nBytes )
{
unsigned long value =
((unsigned long)in_buffer[0]) << 16 |
((unsigned long)in_buffer[1]) << 8 |
((unsigned long)in_buffer[2]) << 0;
unsigned char out_buffer[4];
memset( out_buffer, '=', sizeof(out_buffer) );
out_buffer[0] = base64_tab[(value >> 18) & 0x3F];
out_buffer[1] = base64_tab[(value >> 12) & 0x3F];
if ( nBytes > 1 )
{
out_buffer[2] = base64_tab[(value >> 6) & 0x3F];
if ( nBytes > 2 )
out_buffer[3] = base64_tab[(value >> 0) & 0x3F];
}
if ( nLineLength >= 76 )
{
fputs( "\n", fout );
nLineLength = 0;
}
nBytesWritten += fwrite( out_buffer, 1, sizeof(out_buffer), fout );
nLineLength += sizeof(out_buffer);
}
} while ( nBytes );
return nBytesWritten;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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