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dcm4chee/default/tmp/deploy/tmp7473912347174030350oviyam2-exp.war/js/lib/BinFileReader.js

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+/**
+ * BinFileReader.js
+ * You can find more about this function at
+ * http://nagoon97.com/reading-binary-files-using-ajax/
+ *
+ * Copyright (c) 2008 Andy G.P. Na <nagoon97@naver.com>
+ * The source code is freely distributable under the terms of an MIT-style license.
+ */
+function BinFileReader(fileURL){
+	var _exception = {};
+	_exception.FileLoadFailed = 1;
+	_exception.EOFReached = 2;
+
+	var filePointer = 0;
+	var fileSize = -1;
+	var fileContents;
+
+	this.getFileSize = function(){
+		return fileSize;
+	}
+
+	this.getFilePointer = function(){
+		return filePointer;
+	}
+	this.readBytes=function()
+	{
+		return fileContents;
+	}
+	
+	this.movePointerTo = function(iTo){
+		if(iTo < 0) filePointer = 0;
+		else if(iTo > this.getFileSize()) throwException(_exception.EOFReached);
+		else filePointer = iTo;
+
+		return filePointer;
+	};
+
+	this.movePointer = function(iDirection){
+		this.movePointerTo(filePointer + iDirection);
+
+		return filePointer;
+	};
+
+	this.readNumber = function(iNumBytes, iFrom){
+		iNumBytes = iNumBytes || 1;
+		iFrom = iFrom || filePointer;
+
+		this.movePointerTo(iFrom + iNumBytes);
+
+		var result = 0;
+		for(var i=iFrom + iNumBytes; i>iFrom; i--){
+			result = result * 256 + this.readByteAt(i-1);
+		}
+
+		return result;
+	};	
+	
+	this.readString = function(iNumChars, iFrom){
+		iNumChars = iNumChars || 1;
+		iFrom = iFrom || filePointer;
+
+		this.movePointerTo(iFrom);
+
+		var result = "";
+		var tmpTo = iFrom + iNumChars;
+		for(var i=iFrom; i<tmpTo; i++){
+			result += String.fromCharCode(this.readNumber(1));
+		}
+
+		return result;
+	};
+	
+	this.getBytes = function(iFrom) {
+		this.movePointerTo(iFrom);
+		var tmpTo = fileContents.length;
+		
+		var result = new Uint8Array(tmpTo-iFrom);
+		var index = 0;
+		for(var i=iFrom;i<tmpTo;i++) {
+			result[index] = this.readByteAt(i);
+			index++;
+		}
+		
+		return result;
+	};
+	
+	this.readUnicodeString = function(iNumChars, iFrom){
+		iNumChars = iNumChars || 1;
+		iFrom = iFrom || filePointer;
+
+		this.movePointerTo(iFrom);
+
+		var result = "";
+		var tmpTo = iFrom + iNumChars*2;
+		for(var i=iFrom; i<tmpTo; i+=2){
+			result += String.fromCharCode(this.readNumber(2));
+		}
+
+		return result;
+	};
+
+	function throwException(errorCode){
+		switch(errorCode){
+			case _exception.FileLoadFailed:
+				throw new Error('Error: Filed to load "'+fileURL+'"');
+				break;
+			case _exception.EOFReached:
+				throw new Error("Error: EOF reached");
+				break;
+		}
+	}
+
+	function BinFileReaderImpl_IE(fileURL){
+		var vbArr = BinFileReaderImpl_IE_VBAjaxLoader(fileURL);
+		fileContents = vbArr.toArray();
+
+		fileSize = fileContents.length-1;
+
+		if(fileSize < 0) throwException(_exception.FileLoadFailed);
+
+		this.readByteAt = function(i){
+			return fileContents[i];
+		}
+	}
+	
+	function BinFileReaderImpl(fileURL){
+		var req = new XMLHttpRequest();
+
+		req.open('GET', fileURL, false);
+
+		//XHR binary charset opt by Marcus Granado 2006 [http://mgran.blogspot.com] 
+		req.overrideMimeType('text/plain; charset=x-user-defined');
+		req.send(null);
+
+		if (req.status != 200) throwException(_exception.FileLoadFailed);
+		{			
+		fileContents = req.responseText;
+		}		
+		fileSize = fileContents.length;
+		this.readByteAt = function(i){
+			return fileContents.charCodeAt(i) & 0xff;
+		}
+	}
+	if(/msie/i.test(navigator.userAgent) && !/opera/i.test(navigator.userAgent))
+		BinFileReaderImpl_IE.apply(this, [fileURL]);
+	else
+		BinFileReaderImpl.apply(this, [fileURL]);
+}