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267 lines
6.6 KiB
C++
267 lines
6.6 KiB
C++
/** \file Base64.cpp
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** \date 2004-02-13
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** \author grymse@alhem.net
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**/
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/*
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Copyright (C) 2004,2005 Anders Hedstrom
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This library is made available under the terms of the GNU GPL.
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If you would like to use this library in a closed-source application,
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a separate license agreement is available. For information about
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the closed-source license agreement for the C++ sockets library,
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please visit http://www.alhem.net/Sockets/license.html and/or
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email license@alhem.net.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "Base64.h"
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#ifdef SOCKETS_NAMESPACE
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namespace SOCKETS_NAMESPACE {
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#endif
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const char *Base64::bstr =
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"ABCDEFGHIJKLMNOPQ"
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"RSTUVWXYZabcdefgh"
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"ijklmnopqrstuvwxy"
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"z0123456789+/";
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const char Base64::rstr[] = {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 62, 0, 0, 0, 63,
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52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 0, 0, 0, 0, 0, 0,
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0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
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15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 0, 0, 0, 0, 0,
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0, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
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41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 0, 0, 0, 0, 0};
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void Base64::encode(FILE *fil, std::string& output, bool add_crlf)
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{
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size_t remain;
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size_t i = 0;
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size_t o = 0;
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char input[4];
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output = "";
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remain = fread(input,1,3,fil);
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while (remain > 0)
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{
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if (add_crlf && o && o % 76 == 0)
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output += "\n";
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switch (remain)
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{
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case 1:
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output += bstr[ ((input[i] >> 2) & 0x3f) ];
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output += bstr[ ((input[i] << 4) & 0x30) ];
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output += "==";
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break;
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case 2:
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output += bstr[ ((input[i] >> 2) & 0x3f) ];
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output += bstr[ ((input[i] << 4) & 0x30) + ((input[i + 1] >> 4) & 0x0f) ];
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output += bstr[ ((input[i + 1] << 2) & 0x3c) ];
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output += "=";
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break;
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default:
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output += bstr[ ((input[i] >> 2) & 0x3f) ];
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output += bstr[ ((input[i] << 4) & 0x30) + ((input[i + 1] >> 4) & 0x0f) ];
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output += bstr[ ((input[i + 1] << 2) & 0x3c) + ((input[i + 2] >> 6) & 0x03) ];
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output += bstr[ (input[i + 2] & 0x3f) ];
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}
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o += 4;
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//
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remain = fread(input,1,3,fil);
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}
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}
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void Base64::encode(const std::string& str_in, std::string& str_out, bool add_crlf)
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{
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encode(str_in.c_str(), str_in.size(), str_out, add_crlf);
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}
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void Base64::encode(const char* input,size_t l,std::string& output, bool add_crlf)
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{
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size_t i = 0;
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size_t o = 0;
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output = "";
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while (i < l)
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{
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size_t remain = l - i;
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if (add_crlf && o && o % 76 == 0)
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output += "\n";
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switch (remain)
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{
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case 1:
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output += bstr[ ((input[i] >> 2) & 0x3f) ];
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output += bstr[ ((input[i] << 4) & 0x30) ];
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output += "==";
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break;
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case 2:
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output += bstr[ ((input[i] >> 2) & 0x3f) ];
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output += bstr[ ((input[i] << 4) & 0x30) + ((input[i + 1] >> 4) & 0x0f) ];
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output += bstr[ ((input[i + 1] << 2) & 0x3c) ];
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output += "=";
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break;
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default:
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output += bstr[ ((input[i] >> 2) & 0x3f) ];
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output += bstr[ ((input[i] << 4) & 0x30) + ((input[i + 1] >> 4) & 0x0f) ];
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output += bstr[ ((input[i + 1] << 2) & 0x3c) + ((input[i + 2] >> 6) & 0x03) ];
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output += bstr[ (input[i + 2] & 0x3f) ];
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}
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o += 4;
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i += 3;
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}
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}
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void Base64::encode(unsigned char* input,size_t l,std::string& output,bool add_crlf)
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{
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size_t i = 0;
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size_t o = 0;
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output = "";
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while (i < l)
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{
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size_t remain = l - i;
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if (add_crlf && o && o % 76 == 0)
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output += "\n";
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switch (remain)
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{
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case 1:
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output += bstr[ ((input[i] >> 2) & 0x3f) ];
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output += bstr[ ((input[i] << 4) & 0x30) ];
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output += "==";
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break;
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case 2:
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output += bstr[ ((input[i] >> 2) & 0x3f) ];
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output += bstr[ ((input[i] << 4) & 0x30) + ((input[i + 1] >> 4) & 0x0f) ];
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output += bstr[ ((input[i + 1] << 2) & 0x3c) ];
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output += "=";
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break;
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default:
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output += bstr[ ((input[i] >> 2) & 0x3f) ];
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output += bstr[ ((input[i] << 4) & 0x30) + ((input[i + 1] >> 4) & 0x0f) ];
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output += bstr[ ((input[i + 1] << 2) & 0x3c) + ((input[i + 2] >> 6) & 0x03) ];
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output += bstr[ (input[i + 2] & 0x3f) ];
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}
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o += 4;
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i += 3;
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}
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}
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void Base64::decode(const std::string& input,std::string& output)
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{
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size_t i = 0;
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size_t l = input.size();
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output = "";
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while (i < l)
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{
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while (i < l && (input[i] == 13 || input[i] == 10))
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i++;
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if (i < l)
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{
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char b1 = (char)((rstr[(int)input[i]] << 2 & 0xfc) +
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(rstr[(int)input[i + 1]] >> 4 & 0x03));
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output += b1;
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if (input[i + 2] != '=')
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{
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char b2 = (char)((rstr[(int)input[i + 1]] << 4 & 0xf0) +
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(rstr[(int)input[i + 2]] >> 2 & 0x0f));
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output += b2;
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}
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if (input[i + 3] != '=')
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{
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char b3 = (char)((rstr[(int)input[i + 2]] << 6 & 0xc0) +
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rstr[(int)input[i + 3]]);
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output += b3;
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}
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i += 4;
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}
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}
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}
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void Base64::decode(const std::string& input, unsigned char *output, size_t& sz)
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{
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size_t i = 0;
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size_t l = input.size();
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size_t j = 0;
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while (i < l)
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{
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while (i < l && (input[i] == 13 || input[i] == 10))
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i++;
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if (i < l)
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{
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unsigned char b1 = (unsigned char)((rstr[(int)input[i]] << 2 & 0xfc) +
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(rstr[(int)input[i + 1]] >> 4 & 0x03));
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if (output)
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{
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output[j] = b1;
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}
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j++;
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if (input[i + 2] != '=')
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{
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unsigned char b2 = (unsigned char)((rstr[(int)input[i + 1]] << 4 & 0xf0) +
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(rstr[(int)input[i + 2]] >> 2 & 0x0f));
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if (output)
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{
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output[j] = b2;
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}
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j++;
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}
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if (input[i + 3] != '=')
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{
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unsigned char b3 = (unsigned char)((rstr[(int)input[i + 2]] << 6 & 0xc0) +
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rstr[(int)input[i + 3]]);
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if (output)
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{
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output[j] = b3;
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}
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j++;
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}
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i += 4;
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}
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}
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sz = j;
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}
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size_t Base64::decode_length(const std::string& str64)
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{
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if (!str64.size() || str64.size() % 4)
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return 0;
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size_t l = 3 * (str64.size() / 4 - 1) + 1;
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if (str64[str64.size() - 2] != '=')
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l++;
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if (str64[str64.size() - 1] != '=')
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l++;
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return l;
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}
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#ifdef SOCKETS_NAMESPACE
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}
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#endif
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