1*e7917716SAndrew Rist /************************************************************** 2cdf0e10cSrcweir * 3*e7917716SAndrew Rist * Licensed to the Apache Software Foundation (ASF) under one 4*e7917716SAndrew Rist * or more contributor license agreements. See the NOTICE file 5*e7917716SAndrew Rist * distributed with this work for additional information 6*e7917716SAndrew Rist * regarding copyright ownership. The ASF licenses this file 7*e7917716SAndrew Rist * to you under the Apache License, Version 2.0 (the 8*e7917716SAndrew Rist * "License"); you may not use this file except in compliance 9*e7917716SAndrew Rist * with the License. You may obtain a copy of the License at 10*e7917716SAndrew Rist * 11*e7917716SAndrew Rist * http://www.apache.org/licenses/LICENSE-2.0 12*e7917716SAndrew Rist * 13*e7917716SAndrew Rist * Unless required by applicable law or agreed to in writing, 14*e7917716SAndrew Rist * software distributed under the License is distributed on an 15*e7917716SAndrew Rist * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16*e7917716SAndrew Rist * KIND, either express or implied. See the License for the 17*e7917716SAndrew Rist * specific language governing permissions and limitations 18*e7917716SAndrew Rist * under the License. 19*e7917716SAndrew Rist * 20*e7917716SAndrew Rist *************************************************************/ 21*e7917716SAndrew Rist 22*e7917716SAndrew Rist 23cdf0e10cSrcweir 24cdf0e10cSrcweir #include <stdio.h> 25cdf0e10cSrcweir #include <string.h> 26cdf0e10cSrcweir #include "base64.h" 27cdf0e10cSrcweir 28cdf0e10cSrcweir static const char base64_tab[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; 29cdf0e10cSrcweir 30cdf0e10cSrcweir extern "C" size_t base64_encode( FILE *fin, FILE *fout ) 31cdf0e10cSrcweir { 32cdf0e10cSrcweir size_t nBytesRead = 0; 33cdf0e10cSrcweir size_t nLineLength = 0; 34cdf0e10cSrcweir size_t nBytesWritten = 0; 35cdf0e10cSrcweir 36cdf0e10cSrcweir size_t nBytes = 0; 37cdf0e10cSrcweir 38cdf0e10cSrcweir do 39cdf0e10cSrcweir { 40cdf0e10cSrcweir unsigned char in_buffer[3]; 41cdf0e10cSrcweir 42cdf0e10cSrcweir memset( in_buffer, 0, sizeof(in_buffer) ); 43cdf0e10cSrcweir nBytes = fread( in_buffer, 1, sizeof(in_buffer), fin ); 44cdf0e10cSrcweir nBytesRead += nBytes; 45cdf0e10cSrcweir 46cdf0e10cSrcweir if ( nBytes ) 47cdf0e10cSrcweir { 48cdf0e10cSrcweir unsigned long value = 49cdf0e10cSrcweir ((unsigned long)in_buffer[0]) << 16 | 50cdf0e10cSrcweir ((unsigned long)in_buffer[1]) << 8 | 51cdf0e10cSrcweir ((unsigned long)in_buffer[2]) << 0; 52cdf0e10cSrcweir 53cdf0e10cSrcweir unsigned char out_buffer[4]; 54cdf0e10cSrcweir 55cdf0e10cSrcweir memset( out_buffer, '=', sizeof(out_buffer) ); 56cdf0e10cSrcweir 57cdf0e10cSrcweir out_buffer[0] = base64_tab[(value >> 18) & 0x3F]; 58cdf0e10cSrcweir out_buffer[1] = base64_tab[(value >> 12) & 0x3F]; 59cdf0e10cSrcweir 60cdf0e10cSrcweir if ( nBytes > 1 ) 61cdf0e10cSrcweir { 62cdf0e10cSrcweir out_buffer[2] = base64_tab[(value >> 6) & 0x3F]; 63cdf0e10cSrcweir if ( nBytes > 2 ) 64cdf0e10cSrcweir out_buffer[3] = base64_tab[(value >> 0) & 0x3F]; 65cdf0e10cSrcweir } 66cdf0e10cSrcweir 67cdf0e10cSrcweir if ( nLineLength >= 76 ) 68cdf0e10cSrcweir { 69cdf0e10cSrcweir fputs( "\n", fout ); 70cdf0e10cSrcweir nLineLength = 0; 71cdf0e10cSrcweir } 72cdf0e10cSrcweir 73cdf0e10cSrcweir nBytesWritten += fwrite( out_buffer, 1, sizeof(out_buffer), fout ); 74cdf0e10cSrcweir nLineLength += sizeof(out_buffer); 75cdf0e10cSrcweir } 76cdf0e10cSrcweir } while ( nBytes ); 77cdf0e10cSrcweir 78cdf0e10cSrcweir return nBytesWritten; 79cdf0e10cSrcweir } 80