From 55974d21a824378b287e563bce4c32597060cfca Mon Sep 17 00:00:00 2001
From: Mike Crute <mcrute@gmail.com>
Date: Sun, 17 Jan 2010 12:06:15 -0500
Subject: Initial import

---
 docroot/classes/decoder.module.js | 205 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 205 insertions(+)
 create mode 100755 docroot/classes/decoder.module.js

(limited to 'docroot/classes/decoder.module.js')

diff --git a/docroot/classes/decoder.module.js b/docroot/classes/decoder.module.js
new file mode 100755
index 0000000..ae33059
--- /dev/null
+++ b/docroot/classes/decoder.module.js
@@ -0,0 +1,205 @@
+/*
+ * Material Experience - Encoder/Decoder Module
+ * 
+ * EYEMG - Interactive Media Group
+ * Updated by Mike Crute (mcrute@eyemg.com) on 9/26/07
+ * 
+ * Encoder/Decoder module for common encoding schemes like URL and 
+ * base64. Code from: http://ostermiller.org/calc/encode.html
+ */
+var END_OF_INPUT = -1;
+
+var base64Chars = new Array(
+	'A','B','C','D','E','F','G','H',
+	'I','J','K','L','M','N','O','P',
+	'Q','R','S','T','U','V','W','X',
+	'Y','Z','a','b','c','d','e','f',
+	'g','h','i','j','k','l','m','n',
+	'o','p','q','r','s','t','u','v',
+	'w','x','y','z','0','1','2','3',
+	'4','5','6','7','8','9','+','/'
+);
+
+var reverseBase64Chars = new Array();
+var base64Str;
+var base64Count;
+
+for (var i=0; i < base64Chars.length; i++)
+{
+	reverseBase64Chars[base64Chars[i]] = i;
+}
+
+// -------------------------------------------------------------------------- \\
+
+function urlDecode(str)
+{
+	return unescape(str.replace(new RegExp('\\+','g'),' '));
+}
+
+function urlEncode(str)
+{
+	str = escape(str);
+	str = str.replace(new RegExp('\\+','g'),'%2B');
+	
+	return str.replace(new RegExp('%20','g'),'+');
+}
+
+// -------------------------------------------------------------------------- \\
+
+function setBase64Str(str)
+{
+	base64Str   = str;
+	base64Count = 0;
+}
+
+function readBase64()
+{
+	if (!base64Str) 
+	{
+		return END_OF_INPUT;
+	}
+	
+	if (base64Count >= base64Str.length)
+	{
+		return END_OF_INPUT;
+	}
+	
+	var c = base64Str.charCodeAt(base64Count) & 0xff;
+	
+	base64Count++;
+	
+	return c;
+}
+
+function encodeBase64(str)
+{
+	setBase64Str(str);
+	
+	var result    = '';
+	var inBuffer  = new Array(3);
+	var lineCount = 0;
+	var done      = false;
+    
+	while (!done && (inBuffer[0] = readBase64()) != END_OF_INPUT)
+	{
+		inBuffer[1]  = readBase64();
+		inBuffer[2]  = readBase64();
+		result      += (base64Chars[ inBuffer[0] >> 2 ]);
+		
+		if (inBuffer[1] != END_OF_INPUT)
+		{
+			result += (base64Chars [(( inBuffer[0] << 4 ) & 0x30) | (inBuffer[1] >> 4) ]);
+	
+			if (inBuffer[2] != END_OF_INPUT)
+			{
+				result += (base64Chars [((inBuffer[1] << 2) & 0x3c) | (inBuffer[2] >> 6) ]);
+				result += (base64Chars [inBuffer[2] & 0x3F]);
+			}
+			else 
+			{
+				result += (base64Chars [((inBuffer[1] << 2) & 0x3c)]);
+				result += ('=');
+				done    = true;
+			}
+		}
+		else 
+		{
+			result += (base64Chars [(( inBuffer[0] << 4 ) & 0x30)]);
+			result += ('=');
+			result += ('=');
+			done    = true;
+		}
+		
+		lineCount += 4;
+		
+		if (lineCount >= 76)
+		{
+			result   += ('\n');
+			lineCount = 0;
+		}
+	}
+
+	return result;
+}
+
+function readReverseBase64()
+{
+	if (!base64Str)
+	{
+		return END_OF_INPUT;
+	}
+	
+	while (true)
+	{
+		if (base64Count >= base64Str.length)
+		{
+			return END_OF_INPUT;
+		}
+		
+		var nextCharacter = base64Str.charAt(base64Count);
+		base64Count++;
+		
+		if (reverseBase64Chars[nextCharacter])
+		{
+			return reverseBase64Chars[nextCharacter];
+		}
+		
+		if (nextCharacter == 'A') 
+		{
+			return 0;
+		}
+	}
+	
+	return END_OF_INPUT;
+}
+
+function ntos(n)
+{
+	n = n.toString(16);
+	
+	if (n.length == 1) 
+	{
+		n = "0" + n;
+	}
+	
+	n = "%" + n;
+	
+	return unescape(n);
+}
+
+function decodeBase64(str)
+{
+	setBase64Str(str);
+	
+	var result   = "";
+	var inBuffer = new Array(4);
+	var done     = false;
+
+	while (!done && (inBuffer[0] = readReverseBase64()) != END_OF_INPUT
+		&& (inBuffer[1] = readReverseBase64()) != END_OF_INPUT)
+        {
+		inBuffer[2]  = readReverseBase64();
+		inBuffer[3]  = readReverseBase64();
+		result      += ntos((((inBuffer[0] << 2) & 0xff)| inBuffer[1] >> 4));
+		
+		if (inBuffer[2] != END_OF_INPUT)
+		{
+			result +=  ntos((((inBuffer[1] << 4) & 0xff)| inBuffer[2] >> 2));
+
+			if (inBuffer[3] != END_OF_INPUT)
+			{
+				result +=  ntos((((inBuffer[2] << 6)  & 0xff) | inBuffer[3]));
+			}
+			else 
+			{
+				done = true;
+			}
+		} 
+		else 
+		{
+			done = true;
+		}
+	}
+	
+	return result;
+}
\ No newline at end of file
-- 
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