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65 lines
1.9 KiB
65 lines
1.9 KiB
/*
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* Copyright (c)2012 Nicolas Cannasse
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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package sys.db;
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class Id {
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public static function encode( id : String ) : Int {
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var l = id.length;
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if( l > 6 )
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throw "Invalid identifier '"+id+"'";
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var k = 0;
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var p = l;
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while( p > 0 ) {
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var c = id.charCodeAt(--p) - 96;
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if( c < 1 || c > 26 ) {
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c = c + 96 - 48;
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if( c >= 1 && c <= 5 )
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c += 26;
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else
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throw "Invalid character "+id.charCodeAt(p)+" in "+id;
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}
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k <<= 5;
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k += c;
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}
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return k;
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}
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public static function decode( id : Int ) : String {
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var s = new StringBuf();
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if( id < 1 ) {
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if( id == 0 ) return "";
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throw "Invalid ID "+id;
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}
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while( id > 0 ) {
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var k = id & 31;
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if( k < 27 )
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s.addChar(k + 96);
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else
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s.addChar(k + 22);
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id >>= 5;
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}
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return s.toString();
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}
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}
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