1 /************************************************************** 2 * 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, 14 * software distributed under the License is distributed on an 15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 * KIND, either express or implied. See the License for the 17 * specific language governing permissions and limitations 18 * under the License. 19 * 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 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