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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#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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