pegasus/src/Pegasus/Common/Base64.cpp - annotate

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1 karl 1.1 //%///////////////////////////////////////////////////////////////////////////// 2 //
3 kumpf 1.10 // Copyright (c) 2000, 2001, 2002 BMC Software, Hewlett-Packard Company, IBM,
4 karl 1.1 // The Open Group, Tivoli Systems 5 // 6 // Permission is hereby granted, free of charge, to any person obtaining a copy
7 kumpf 1.10 // of this software and associated documentation files (the "Software"), to 8 // deal in the Software without restriction, including without limitation the 9 // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 karl 1.1 // sell copies of the Software, and to permit persons to whom the Software is 11 // furnished to do so, subject to the following conditions: 12 //
13 kumpf 1.10 // THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN
14 karl 1.1 // ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED 15 // "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
16 kumpf 1.10 // LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR 17 // PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 18 // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
19 karl 1.1 // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 20 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 21 // 22 //============================================================================== 23 // 24 // Author: Karl Schopmeyer (k.schopmeyer@opengroup.org) 25 // 26 // Modified By: 27 // 28 //%///////////////////////////////////////////////////////////////////////////// 29 30 #include <strstream>
31 kumpf 1.3 #include <string>
32 kumpf 1.7 #include "Base64.h"
33 karl 1.1 #include <Pegasus/Common/Array.h> 34 35 PEGASUS_NAMESPACE_BEGIN 36 PEGASUS_USING_STD; 37
38 sage 1.5 #ifdef PEGASUS_PLATFORM_AIX_RS_IBMCXX 39 #define inline 40 #endif 41
42 karl 1.1 //************************************************************* 43 /* Encode static method takes an array of 8-bit values and 44 returns a base-64 stream.
45 karl 1.2 ATTN: KS feb 2002 - This is probably a very slow an inefficient 46 implementation and could be improved if it is required for 47 production. Today it is only for test programs.
48 karl 1.1 */
49 kumpf 1.4 Array<Sint8> Base64::encode(const Array<Uint8>& vby)
50 karl 1.1 {
51 karl 1.2 Array<Sint8> retArray;
52 karl 1.1 // If nothing in input string, return empty string 53 if (vby.size() == 0)
54 karl 1.2 return retArray;
55 karl 1.1 // for every character in the input array taken 3 bytes at a time 56 57 for (Uint32 i=0; i < vby.size(); i+=3) 58 { 59 60 // Create from 3 8 bit values to 4 6 bit values 61 Uint8 by1=0,by2=0,by3=0; 62 by1 = vby[i]; 63 if (i+1<vby.size()) 64 { 65 by2 = vby[i+1]; 66 }; 67 if (i+2<vby.size()) 68 { 69 by3 = vby[i+2]; 70 } 71 72 Uint8 by4=0,by5=0,by6=0,by7=0; 73 by4 = by1>>2; 74 by5 = ((by1&0x3)<<4)\|(by2>>4); 75 by6 = ((by2&0xf)<<2)\|(by3>>6); 76 karl 1.1 by7 = by3&0x3f; 77
78 karl 1.2 retArray.append(_Encode(by4)); 79 retArray.append(_Encode(by5));
80 karl 1.1 81 if (i+1<vby.size())
82 karl 1.2 retArray.append( _Encode(by6));
83 karl 1.1 else
84 karl 1.2 retArray.append('=');
85 karl 1.1 86 if (i+2<vby.size())
87 karl 1.2 retArray.append( _Encode(by7));
88 karl 1.1 else
89 karl 1.2 retArray.append('=');
90 karl 1.1
91 kumpf 1.6 /* ATTN: Need to fix this. It adds unwanted cr-lf after 4 chars. 92
93 karl 1.1 if (i % (76/4*3) == 0) 94 {
95 karl 1.2 retArray.append( '\r'); 96 retArray.append( '\n');
97 karl 1.1 }
98 kumpf 1.6 */
99 karl 1.1 }; 100
101 karl 1.2 return retArray;
102 karl 1.1 }; 103 /*I checked for the zero length. The algorithm would also work for zero length input stream, but I’m pretty adamant about handling border conditions. They are often the culprits of run-time production failures. 104 The algorithm goes thru each three bytes of data at a time. The first thing I do is to shift the bits around from three 8-bit values to four 6-bit values. Then I encode the 6-bit values and add then one at a time to the output stream. This is actually quite inefficient. The STL character array is being allocated one byte at a time. The algorithm would be much faster, if I pre-allocated that array. I’ll leave that as an optimization practical exercise for the reader.
105 kumpf 1.9 */
106 karl 1.1 107 /* The decode static method takes a base-64 stream and converts it 108 to an array of 8-bit values. 109 */
110 kumpf 1.4 Array<Uint8> Base64::decode(const Array<Sint8> strInput)
111 karl 1.1 { 112 //Strip any non-base64 characters from the input
113 kumpf 1.3 PEGASUS_STD(string) str;
114 karl 1.1 for (Uint32 j=0;j<strInput.size();j++) 115 { 116 if (_IsBase64(strInput[j])) 117 str += strInput[j]; 118 }
119 karl 1.2 120 Array<Uint8> retArray;
121 karl 1.1 122 // Return if the input is zero length 123 if (str.length() == 0)
124 karl 1.2 return retArray;
125 karl 1.1 126 // comment
127 kumpf 1.8 for (size_t i=0; i < str.length();i+=4)
128 karl 1.1 { 129 char c1='A',c2='A',c3='A',c4='A'; 130 131 c1 = str[i]; 132 if (i+1<str.length()) 133 c2 = str[i+1]; 134 if (i+2<str.length()) 135 c3 = str[i+2]; 136 if (i+3<str.length()) 137 c4 = str[i+3]; 138 139 Uint8 by1=0,by2=0,by3=0,by4=0; 140 by1 = _Decode(c1); 141 by2 = _Decode(c2); 142 by3 = _Decode(c3); 143 by4 = _Decode(c4); 144 //cout << "base::64decode bytes" << 145 // " 1 " << c1 << " " << by1 << 146 // " 2 " << c2 << " " << by2 << 147 // " 3 " << c3 << " " << by3 << 148 // " 4 " << c4 << " " << by4 << endl; 149 karl 1.1 150 // append first byte by shifting
151 karl 1.2 retArray.append( (by1<<2)\|(by2>>4) );
152 karl 1.1 153 // append second byte if not padding 154 if (c3 != '=')
155 karl 1.2 retArray.append( ((by2&0xf)<<4)\|(by3>>2) );
156 karl 1.1 157 if (c4 != '=')
158 karl 1.2 retArray.append( ((by3&0x3)<<6)\|by4 );
159 karl 1.1 } 160
161 karl 1.2 return retArray;
162 karl 1.1 }; 163 164 //********************************************************** 165 /* Encode thanslates one six-bit pattern into a base-64 character. 166 Unsigned char is used to represent a six-bit stream of date. 167 168 */ 169 inline PEGASUS_COMMON_LINKAGE char Base64::_Encode(Uint8 uc) 170 { 171 if (uc < 26) 172 return 'A'+uc; 173 174 if (uc < 52) 175 return 'a'+(uc-26); 176 177 if (uc < 62) 178 return '0'+(uc-52); 179 180 if (uc == 62) 181 return '+'; 182 183 karl 1.1 return '/'; 184 }; 185 186 //Helper function returns true is a character is a valid base-64 character and false otherwise. 187 188 inline Boolean Base64::_IsBase64(char c) 189 { 190 191 if (c >= 'A' && c <= 'Z') 192 return true; 193 194 if (c >= 'a' && c <= 'z') 195 return true; 196 197 if (c >= '0' && c <= '9') 198 return true; 199 200 if (c == '+') 201 return true; 202 203 if (c == '/') 204 karl 1.1 return true; 205 206 if (c == '=') 207 return true; 208 209 return false; 210 }; 211 212 // Translate one base-64 character into a six bit pattern 213 inline Uint8 Base64::_Decode(char c) 214 { 215 if (c >= 'A' && c <= 'Z') 216 return c - 'A'; 217 if (c >= 'a' && c <= 'z') 218 return c - 'a' + 26; 219 220 if (c >= '0' && c <= '9') 221 return c - '0' + 52; 222 223 if (c == '+') 224 return 62; 225 karl 1.1 226 return 63; 227 }; 228 229 230 PEGASUS_NAMESPACE_END

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