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