1 files changed, 101 insertions, 0 deletions
diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/refactoring/utils/FileContentHelper.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/refactoring/utils/FileContentHelper.java
new file mode 100644
index 00000000000..eb59d5b5198
--- /dev/null
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/refactoring/utils/FileContentHelper.java
@@ -0,0 +1,101 @@
+/*******************************************************************************
+ * Copyright (c) 2008 Institute for Software, HSR Hochschule fuer Technik  
+ * Rapperswil, University of applied sciences and others
+ * All rights reserved. This program and the accompanying materials 
+ * are made available under the terms of the Eclipse Public License v1.0 
+ * which accompanies this distribution, and is available at 
+ * http://www.eclipse.org/legal/epl-v10.html  
+ * 
+ * Contributors: 
+ * Institute for Software - initial API and implementation 
+ ******************************************************************************/
+package org.eclipse.cdt.internal.ui.refactoring.utils;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.UnsupportedEncodingException;
+
+import org.eclipse.core.resources.IFile;
+import org.eclipse.core.runtime.CoreException;
+
+import org.eclipse.cdt.ui.CUIPlugin;
+
+/**
+ * @author Emanuel Graf IFS
+ *
+ */
+public class FileContentHelper {
+	
+	private static final int bufferSize = 512;
+
+	public static String getContent(IFile file, int start) throws CoreException, IOException{
+		
+		InputStreamReader reader = getReaderForFile(file);	
+		skip(start, reader);
+		
+		return readRest(reader);
+		
+	}
+	
+	public static String getContent(IFile file, int start, int length) {
+		try {
+			InputStreamReader r = getReaderForFile(file);
+			char[] bytes = new char[length];
+			
+			skip(start, r);
+			
+			read(length, r, bytes);
+			
+			return new String(bytes);
+		} catch (IOException e) {
+			CUIPlugin.getDefault().log(e);
+		} catch (CoreException e) {
+			CUIPlugin.getDefault().log(e);
+		}
+		return ""; //$NON-NLS-1$
+	}
+
+	private static InputStreamReader getReaderForFile(IFile file)
+			throws CoreException, UnsupportedEncodingException {
+		InputStream contents = file.getContents();
+		InputStreamReader r = new InputStreamReader(contents, file.getCharset());
+		return r;
+	}
+
+	private static String readRest(InputStreamReader reader) throws IOException{
+		StringBuilder content = new StringBuilder();
+		char[] buffer = new char[bufferSize];
+		int bytesRead = 0;
+		while((bytesRead = reader.read(buffer)) >= 0){
+			content.append(buffer, 0, bytesRead);
+		}
+
+		
+		return content.toString();
+	}
+	
+	private static void read(int length, InputStreamReader r, char[] bytes)
+			throws IOException {
+		int bufferOffset = 0;
+		int charactersRead = 0;
+		while(charactersRead >= 0 && length > 0){
+			charactersRead = r.read(bytes, bufferOffset, length);
+			if(charactersRead > 0){
+				bufferOffset += charactersRead;
+				length -= charactersRead;
+			}
+		}
+	}
+
+	private static void skip(int start, InputStreamReader r) throws IOException {
+		long skipped = 0;
+		while(skipped >= 0 && start > 0 && r.ready()){
+			skipped = r.skip(start);
+			if(skipped > 0){
+				start -= skipped;
+			}
+		}
+	}
+
+}