xref: /aoo41x/main/crashrep/source/win32/base64.cpp (revision 79aad27f)
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8  * "License"); you may not use this file except in compliance
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11  *   http://www.apache.org/licenses/LICENSE-2.0
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17  * specific language governing permissions and limitations
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20  *************************************************************/
21 
22 
23 
24 #include <stdio.h>
25 #include <string.h>
26 #include "base64.h"
27 
28 static const char base64_tab[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
29 
base64_encode(FILE * fin,FILE * fout)30 extern "C" size_t base64_encode( FILE *fin, FILE *fout )
31 {
32 	size_t nBytesRead = 0;
33 	size_t nLineLength = 0;
34 	size_t nBytesWritten = 0;
35 
36 	size_t nBytes = 0;
37 
38 	do
39 	{
40 		unsigned char in_buffer[3];
41 
42 		memset( in_buffer, 0, sizeof(in_buffer) );
43 		nBytes = fread( in_buffer, 1, sizeof(in_buffer), fin );
44 		nBytesRead += nBytes;
45 
46 		if ( nBytes )
47 		{
48 			unsigned long value =
49 				((unsigned long)in_buffer[0]) << 16 |
50 				((unsigned long)in_buffer[1]) << 8 |
51 				((unsigned long)in_buffer[2]) << 0;
52 
53 			unsigned char out_buffer[4];
54 
55 			memset( out_buffer, '=', sizeof(out_buffer) );
56 
57 			out_buffer[0] = base64_tab[(value >> 18) & 0x3F];
58 			out_buffer[1] = base64_tab[(value >> 12) & 0x3F];
59 
60 			if ( nBytes > 1 )
61 			{
62 				out_buffer[2] = base64_tab[(value >> 6) & 0x3F];
63 				if ( nBytes > 2 )
64 					out_buffer[3] = base64_tab[(value >> 0) & 0x3F];
65 			}
66 
67 			if ( nLineLength >= 76 )
68 			{
69 				fputs( "\n", fout );
70 				nLineLength = 0;
71 			}
72 
73 			nBytesWritten += fwrite( out_buffer, 1, sizeof(out_buffer), fout );
74 			nLineLength += sizeof(out_buffer);
75 		}
76 	} while ( nBytes );
77 
78 	return nBytesWritten;
79 }
80