/*******************************************************************************
 * Copyright (c) 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jsp;

import java.io.*;
import java.io.File;

public class Util {
	
	static char[] getChars(String s) {
		int l= s.length();
		char[] cc= new char[l];
		if (l > 0)
			s.getChars(0, l, cc, 0);
		return cc;
	}
	
	static char[] getFileCharContent(File file, String encoding) throws IOException {
		System.out.println("****jdt.internal.compiler.util.Util.getFileCharContent: " + file + " " + encoding);
		InputStream stream = null;
		try {
			stream = new BufferedInputStream(new FileInputStream(file));
			return Util.getInputStreamAsCharArray(stream, (int) file.length(), encoding);
		} finally {
			if (stream != null) {
				try {
					stream.close();
				} catch (IOException e) {
					// ignore
				}
			}
		}
	}

	public static char[] getInputStreamAsCharArray(InputStream stream, int length, String encoding) throws IOException {
		InputStreamReader reader = (encoding == null)
			? new InputStreamReader(stream)
			: new InputStreamReader(stream, encoding);
		char[] contents;
		if (length == -1) {
			contents = new char[0];
			int contentsLength = 0;
			int amountRead = -1;
			do {
				int amountRequested = Math.max(stream.available(), 8192);  // read at least 8K

				// resize contents if needed
				if (contentsLength + amountRequested > contents.length) {
					System.arraycopy(
							contents,
							0,
							contents = new char[contentsLength + amountRequested],
							0,
							contentsLength);
				}

				// read as many chars as possible
				amountRead = reader.read(contents, contentsLength, amountRequested);

				if (amountRead > 0) {
					// remember length of contents
					contentsLength += amountRead;
				}
			} while (amountRead != -1);

			// resize contents if necessary
			if (contentsLength < contents.length) {
				System.arraycopy(
						contents,
						0,
						contents = new char[contentsLength],
						0,
						contentsLength);
			}
		} else {
			contents = new char[length];
			int len = 0;
			int readSize = 0;
			while ((readSize != -1) && (len != length)) {
				// See PR 1FMS89U
				// We record first the read size. In this case len is the actual read size.
				len += readSize;
				readSize = reader.read(contents, len, length - len);
			}
			// See PR 1FMS89U
			// Now we need to resize in case the default encoding used more than one byte for each
			// character
			if (len != length)
				System.arraycopy(contents, 0, (contents = new char[len]), 0, len);
		}

		return contents;
	}
}