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/*
 * ===========================================
 * Java Pdf Extraction Decoding Access Library
 * ===========================================
 *
 * Project Info:  http://www.idrsolutions.com
 * Help section for developers at http://www.idrsolutions.com/java-pdf-library-support/
 *
 * (C) Copyright 1997-2013, IDRsolutions and Contributors.
 *
 * 	This file is part of JPedal
 *
     This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


 *
 * ---------------
 * RandomAccessFCTest.java
 * ---------------
 */

package org.jpedal.io;

import java.io.FileInputStream;
import java.io.IOException;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;

import org.jpedal.utils.LogWriter;

public class RandomAccessFCTest implements RandomAccessBuffer {

	// private byte[] data;
	private long pointer;

	private int length = 0;

	private FileChannel fc;

	private MappedByteBuffer mb;

	public RandomAccessFCTest(FileInputStream inFile) {

		try {

			this.length = inFile.available();
			this.fc = (inFile).getChannel();

			this.mb = this.fc.map(FileChannel.MapMode.READ_ONLY, 0L, this.fc.size());

		}
		catch (Exception e) {
			// tell user and log
			if (LogWriter.isOutput()) LogWriter.writeLog("Exception: " + e.getMessage());
		}
	}

	@Override
	public long getFilePointer() throws IOException {
		return this.pointer;
	}

	@Override
	public void seek(long pos) throws IOException {
		if (checkPos(pos)) {
			this.pointer = pos;
		}
		else {
			throw new IOException("Position out of bounds");
		}
	}

	@Override
	public void close() throws IOException {

		if (this.fc != null) {

			this.fc.close();
			this.fc = null;
		}

		if (this.mb != null) {

			this.mb = null;
		}

		this.pointer = -1;
	}

	/**/@Override
	public void finalize() {

		try {
			super.finalize();
		}
		catch (Throwable e) {
			// tell user and log
			if (LogWriter.isOutput()) LogWriter.writeLog("Exception: " + e.getMessage());
		}

		// ensure removal actual file
		try {
			close();
		}
		catch (IOException e) {
			// tell user and log
			if (LogWriter.isOutput()) LogWriter.writeLog("Exception: " + e.getMessage());
		}
	} /**/

	@Override
	public long length() throws IOException {

		if (this.mb != null) {
			return this.length;
		}
		else {
			throw new IOException("Data buffer not initialized.");
		}
	}

	@Override
	public int read() throws IOException {

		if (checkPos(this.pointer)) {

			this.mb.position((int) this.pointer);

			this.pointer++;

			return this.mb.get();
		}
		else {
			return -1;
		}
	}

	private int peek() throws IOException {

		if (checkPos(this.pointer)) {

			this.mb.position((int) this.pointer);

			return this.mb.get();
		}
		else {
			return -1;
		}
	}

	/**
	 * return next line (returns null if no line)
	 */
	@Override
	public String readLine() throws IOException {

		if (this.pointer >= this.length - 1) {
			return null;
		}
		else {

			StringBuilder buf = new StringBuilder();
			int c;
			while ((c = read()) >= 0) {
				if ((c == 10) || (c == 13)) {
					if (((peek() == 10) || (peek() == 13)) && (peek() != c)) read();
					break;
				}
				buf.append((char) c);
			}
			return buf.toString();
		}
	}

	@Override
	public int read(byte[] b) throws IOException {

		if (this.mb == null) throw new IOException("Data buffer not initialized.");

		if (this.pointer < 0 || this.pointer >= this.length) return -1;

		int length = this.length - (int) this.pointer;
		if (length > b.length) length = b.length;

		for (int i = 0; i < length; i++) {

			this.mb.position((int) this.pointer);

			this.pointer++;
			b[i] = this.mb.get();

		}

		return length;
	}

	private static int b2i(byte b) {
		if (b >= 0) return b;
		return 256 + b;
	}

	private boolean checkPos(long pos) throws IOException {
		return ((pos >= 0) && (pos < length()));
	}

	/* returns the byte data */
	@Override
	public byte[] getPdfBuffer() {

		byte[] bytes = new byte[this.length];

		this.mb.position(0);
		this.mb.get(bytes);

		return bytes;
	}
}