Base 64 디코딩 스크립트 General .NET2008/01/06 22:38
function deco(InStr)
{
var base64_decodetable = new Array (
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 62, 255, 255, 255, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255, 255, 255, 255, 255,
255, 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, 255, 255, 255, 255, 255,
255, 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, 255, 255, 255, 255, 255
);
var result = "";
var len = what.length;
var x, y;
var ptr = 0;
while( !isNaN( x = what.charCodeAt( ptr++ ) ) )
{
if( x == 13 || x == 10 )
continue;
if( ( x > 127 ) || (( x = base64_decodetable[x] ) == 255) )
return false;
if( ( isNaN( y = what.charCodeAt( ptr++ ) ) ) || (( y = base64_decodetable[y] ) == 255) )
return false;
result += String.fromCharCode( (x << 2) | (y >> 4) );
if( (x = what.charCodeAt( ptr++ )) == 61 )
{
if( (what.charCodeAt( ptr++ ) != 61) || (!isNaN(what.charCodeAt( ptr ) ) ) )
return false;
}
else
{
if( ( x > 127 ) || (( x = base64_decodetable[x] ) == 255) )
return false;
result += String.fromCharCode( (y << 4) | (x >> 2) );
if( (y = what.charCodeAt( ptr++ )) == 61 )
{
if( !isNaN(what.charCodeAt( ptr ) ) )
return false;
}
else
{
if( (y > 127) || ((y = base64_decodetable[y]) == 255) )
return false;
result += String.fromCharCode( (x << 6) | y );
}
}
}
return result;
}
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