crashrep/source/win32/base64.cpp

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  30
  31 #include <stdio.h>
  32 #include <string.h>
  33 #include "base64.h"
  34
  35 static const char base64_tab[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  36
  37 extern "C" size_t base64_encode( FILE *fin, FILE *fout )
  38 {
  39     size_t nBytesRead = 0;
  40     size_t nLineLength = 0;
  41     size_t nBytesWritten = 0;
  42
  43     size_t nBytes = 0;
  44
  45     do
  46     {
  47         unsigned char in_buffer[3];
  48
  49         memset( in_buffer, 0, sizeof(in_buffer) );
  50         nBytes = fread( in_buffer, 1, sizeof(in_buffer), fin );
  51         nBytesRead += nBytes;
  52
  53         if ( nBytes )
  54         {
  55             unsigned long value =
  56                 ((unsigned long)in_buffer[0]) << 16 |
  57                 ((unsigned long)in_buffer[1]) << 8 |
  58                 ((unsigned long)in_buffer[2]) << 0;
  59
  60             unsigned char out_buffer[4];
  61
  62             memset( out_buffer, '=', sizeof(out_buffer) );
  63
  64             out_buffer[0] = base64_tab[(value >> 18) & 0x3F];
  65             out_buffer[1] = base64_tab[(value >> 12) & 0x3F];
  66
  67             if ( nBytes > 1 )
  68             {
  69                 out_buffer[2] = base64_tab[(value >> 6) & 0x3F];
  70                 if ( nBytes > 2 )
  71                     out_buffer[3] = base64_tab[(value >> 0) & 0x3F];
  72             }
  73
  74             if ( nLineLength >= 76 )
  75             {
  76                 fputs( "\n", fout );
  77                 nLineLength = 0;
  78             }
  79
  80             nBytesWritten += fwrite( out_buffer, 1, sizeof(out_buffer), fout );
  81             nLineLength += sizeof(out_buffer);
  82         }
  83     } while ( nBytes );
  84
  85     return nBytesWritten;
  86 }