crashrep/source/win32/base64.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <stdio.h>
  21 #include <string.h>
  22 #include "base64.h"
  23
  24 static const char base64_tab[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  25
  26 extern "C" size_t base64_encode( FILE *fin, FILE *fout )
  27 {
  28     size_t nLineLength = 0;
  29     size_t nBytesWritten = 0;
  30
  31     size_t nBytes = 0;
  32
  33     do
  34     {
  35         unsigned char in_buffer[3];
  36
  37         memset( in_buffer, 0, sizeof(in_buffer) );
  38         nBytes = fread( in_buffer, 1, sizeof(in_buffer), fin );
  39
  40         if ( nBytes )
  41         {
  42             unsigned long value =
  43                 ((unsigned long)in_buffer[0]) << 16 |
  44                 ((unsigned long)in_buffer[1]) << 8 |
  45                 ((unsigned long)in_buffer[2]) << 0;
  46
  47             unsigned char out_buffer[4];
  48
  49             memset( out_buffer, '=', sizeof(out_buffer) );
  50
  51             out_buffer[0] = base64_tab[(value >> 18) & 0x3F];
  52             out_buffer[1] = base64_tab[(value >> 12) & 0x3F];
  53
  54             if ( nBytes > 1 )
  55             {
  56                 out_buffer[2] = base64_tab[(value >> 6) & 0x3F];
  57                 if ( nBytes > 2 )
  58                     out_buffer[3] = base64_tab[(value >> 0) & 0x3F];
  59             }
  60
  61             if ( nLineLength >= 76 )
  62             {
  63                 fputs( "\n", fout );
  64                 nLineLength = 0;
  65             }
  66
  67             nBytesWritten += fwrite( out_buffer, 1, sizeof(out_buffer), fout );
  68             nLineLength += sizeof(out_buffer);
  69         }
  70     } while ( nBytes );
  71
  72     return nBytesWritten;
  73 }
  74
  75 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */