diff options
Diffstat (limited to 'kopete/protocols/jabber/jingle/libjingle/talk/base/base64.cpp')
| -rw-r--r-- | kopete/protocols/jabber/jingle/libjingle/talk/base/base64.cpp | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/kopete/protocols/jabber/jingle/libjingle/talk/base/base64.cpp b/kopete/protocols/jabber/jingle/libjingle/talk/base/base64.cpp new file mode 100644 index 00000000..e0ec1b90 --- /dev/null +++ b/kopete/protocols/jabber/jingle/libjingle/talk/base/base64.cpp @@ -0,0 +1,194 @@ + +//********************************************************************* +//* Base64 - a simple base64 encoder and decoder. +//* +//* Copyright (c) 1999, Bob Withers - [email protected] +//* +//* This code may be freely used for any purpose, either personal +//* or commercial, provided the authors copyright notice remains +//* intact. +//* +//* Enhancements by Stanley Yamane: +//* o reverse lookup table for the decode function +//* o reserve string buffer space in advance +//* +//********************************************************************* + +#include "talk/base/base64.h" + +using namespace std; + +static const char fillchar = '='; +static const string::size_type np = string::npos; + +const string Base64::Base64Table( + // 0000000000111111111122222222223333333333444444444455555555556666 + // 0123456789012345678901234567890123456789012345678901234567890123 + "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"); + +// Decode Table gives the index of any valid base64 character in the Base64 table] +// 65 == A, 97 == a, 48 == 0, 43 == +, 47 == / + + // 0 1 2 3 4 5 6 7 8 9 +const string::size_type Base64::DecodeTable[] = { + np,np,np,np,np,np,np,np,np,np, // 0 - 9 + np,np,np,np,np,np,np,np,np,np, //10 -19 + np,np,np,np,np,np,np,np,np,np, //20 -29 + np,np,np,np,np,np,np,np,np,np, //30 -39 + np,np,np,62,np,np,np,63,52,53, //40 -49 + 54,55,56,57,58,59,60,61,np,np, //50 -59 + np,np,np,np,np, 0, 1, 2, 3, 4, //60 -69 + 5, 6, 7, 8, 9,10,11,12,13,14, //70 -79 + 15,16,17,18,19,20,21,22,23,24, //80 -89 + 25,np,np,np,np,np,np,26,27,28, //90 -99 + 29,30,31,32,33,34,35,36,37,38, //100 -109 + 39,40,41,42,43,44,45,46,47,48, //110 -119 + 49,50,51,np,np,np,np,np,np,np, //120 -129 + np,np,np,np,np,np,np,np,np,np, //130 -139 + np,np,np,np,np,np,np,np,np,np, //140 -149 + np,np,np,np,np,np,np,np,np,np, //150 -159 + np,np,np,np,np,np,np,np,np,np, //160 -169 + np,np,np,np,np,np,np,np,np,np, //170 -179 + np,np,np,np,np,np,np,np,np,np, //180 -189 + np,np,np,np,np,np,np,np,np,np, //190 -199 + np,np,np,np,np,np,np,np,np,np, //200 -209 + np,np,np,np,np,np,np,np,np,np, //210 -219 + np,np,np,np,np,np,np,np,np,np, //220 -229 + np,np,np,np,np,np,np,np,np,np, //230 -239 + np,np,np,np,np,np,np,np,np,np, //240 -249 + np,np,np,np,np,np //250 -256 +}; + +string Base64::encodeFromArray(const char * data, size_t len) { + size_t i; + char c; + string ret; + + ret.reserve(len * 2); + + for (i = 0; i < len; ++i) + { + c = (data[i] >> 2) & 0x3f; + ret.append(1, Base64Table[c]); + c = (data[i] << 4) & 0x3f; + if (++i < len) + c |= (data[i] >> 4) & 0x0f; + + ret.append(1, Base64Table[c]); + if (i < len) + { + c = (data[i] << 2) & 0x3f; + if (++i < len) + c |= (data[i] >> 6) & 0x03; + + ret.append(1, Base64Table[c]); + } + else + { + ++i; + ret.append(1, fillchar); + } + + if (i < len) + { + c = data[i] & 0x3f; + ret.append(1, Base64Table[c]); + } + else + { + ret.append(1, fillchar); + } + } + + return(ret); +} + + +string Base64::encode(const string& data) +{ + string::size_type i; + char c; + string::size_type len = data.length(); + string ret; + + ret.reserve(len * 2); + + for (i = 0; i < len; ++i) + { + c = (data[i] >> 2) & 0x3f; + ret.append(1, Base64Table[c]); + c = (data[i] << 4) & 0x3f; + if (++i < len) + c |= (data[i] >> 4) & 0x0f; + + ret.append(1, Base64Table[c]); + if (i < len) + { + c = (data[i] << 2) & 0x3f; + if (++i < len) + c |= (data[i] >> 6) & 0x03; + + ret.append(1, Base64Table[c]); + } + else + { + ++i; + ret.append(1, fillchar); + } + + if (i < len) + { + c = data[i] & 0x3f; + ret.append(1, Base64Table[c]); + } + else + { + ret.append(1, fillchar); + } + } + + return(ret); +} + +string Base64::decode(const string& data) +{ + string::size_type i; + char c; + char c1; + string::size_type len = data.length(); + string ret; + + ret.reserve(len); + + for (i = 0; i < len; ++i) + { + c = static_cast<char>(DecodeTable[static_cast<unsigned char>(data[i])]); + ++i; + c1 = static_cast<char>(DecodeTable[static_cast<unsigned char>(data[i])]); + c = (c << 2) | ((c1 >> 4) & 0x3); + ret.append(1, c); + if (++i < len) + { + c = data[i]; + if (fillchar == c) + break; + + c = static_cast<char>(DecodeTable[static_cast<unsigned char>(data[i])]); + c1 = ((c1 << 4) & 0xf0) | ((c >> 2) & 0xf); + ret.append(1, c1); + } + + if (++i < len) + { + c1 = data[i]; + if (fillchar == c1) + break; + + c1 = static_cast<char>(DecodeTable[static_cast<unsigned char>(data[i])]); + c = ((c << 6) & 0xc0) | c1; + ret.append(1, c); + } + } + + return(ret); +} |