base64.cpp
/*
Copyright (c) 2005-2023 by Jakob Schröter <js@camaya.net>
This file is part of the gloox library. http://camaya.net/gloox
This software is distributed under a license. The full license
agreement can be found in the file LICENSE in this distribution.
This software may not be copied, modified, sold or distributed
other than expressed in the named license agreement.
This software is distributed without any warranty.
*/
#include "base64.h"
namespace gloox
{
namespace Base64
{
static const std::string alphabet64( "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" );
static const char pad = '=';
static const char np = static_cast<char>( std::string::npos );
static char table64vals[] =
{
62, np, np, np, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, np, np, np, np, np,
np, np, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17,
18, 19, 20, 21, 22, 23, 24, 25, np, np, np, np, np, np, 26, 27, 28, 29, 30, 31,
32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51
};
inline char table64( unsigned char c )
{
return ( c < 43 || c > 122 ) ? np : table64vals[c-43];
}
const std::string encode64( const std::string& input )
{
std::string encoded;
char c;
const std::string::size_type length = input.length();
encoded.reserve( length * 2 );
for( std::string::size_type i = 0; i < length; ++i )
{
c = static_cast<char>( ( input[i] >> 2 ) & 0x3f );
encoded += alphabet64[c];
c = static_cast<char>( ( input[i] << 4 ) & 0x3f );
if( ++i < length )
c = static_cast<char>( c | static_cast<char>( ( input[i] >> 4 ) & 0x0f ) );
encoded += alphabet64[c];
if( i < length )
{
c = static_cast<char>( ( input[i] << 2 ) & 0x3c );
if( ++i < length )
c = static_cast<char>( c | static_cast<char>( ( input[i] >> 6 ) & 0x03 ) );
encoded += alphabet64[c];
}
else
{
++i;
encoded += pad;
}
if( i < length )
{
c = static_cast<char>( input[i] & 0x3f );
encoded += alphabet64[c];
}
else
{
encoded += pad;
}
}
return encoded;
}
const std::string decode64( const std::string& input )
{
char c, d;
const std::string::size_type length = input.length();
std::string decoded;
decoded.reserve( length );
for( std::string::size_type i = 0; i < length; ++i )
{
c = table64(input[i]);
++i;
d = table64(input[i]);
c = static_cast<char>( ( c << 2 ) | ( ( d >> 4 ) & 0x3 ) );
decoded += c;
if( ++i < length )
{
c = input[i];
if( pad == c )
break;
c = table64(input[i]);
d = static_cast<char>( ( ( d << 4 ) & 0xf0 ) | ( ( c >> 2 ) & 0xf ) );
decoded += d;
}
if( ++i < length )
{
d = input[i];
if( pad == d )
break;
d = table64(input[i]);
c = static_cast<char>( ( ( c << 6 ) & 0xc0 ) | d );
decoded += c;
}
}
return decoded;
}
}
}
gloox::Base64
An implementation of the Base64 data encoding (RFC 3548).
Definition base64.cpp:20
gloox::Base64::decode64
const std::string decode64(const std::string &input)
Definition base64.cpp:83
gloox::Base64::encode64
const std::string encode64(const std::string &input)
Definition base64.cpp:38
gloox
The namespace for the gloox library.
Definition adhoc.cpp:28