ttffileinput.java

来自「纯java操作系统jnode,安装简单和操作简单的个人使用的Java操作系统」· Java 代码 · 共 106 行

package org.jnode.awt.font.truetype;

import java.io.IOException;
import java.io.RandomAccessFile;

/**
 * Concrete implementation of the TrueType Input for one Table, read from a TTF File.
 *
 * Reads one table from the file.
 *
 *  @author Simon Fischer
 *  @version $Id: TTFFileInput.java,v 1.1 2003/11/25 11:51:38 epr Exp $
 */
public class TTFFileInput extends TTFInput {

	private RandomAccessFile ttf;
	private long offset, length;

	public TTFFileInput(RandomAccessFile file, long offset, long length) throws IOException {
		this.ttf = file;
		this.offset = offset;
		this.length = length;
		//this.checksum = checksum;
	}

	public TTFFileInput(RandomAccessFile file) throws IOException {
		this(file, 0, file.length());
	}

	public TTFInput createSubInput(int offset, int length)
	throws IOException {
		return new TTFFileInput(ttf, this.offset + offset, length);
	}

	// --------------- IO ---------------

	public void seek(long offset) throws IOException {
		ttf.seek(this.offset + offset);
		//System.out.println("seek "+(this.offset+offset));
	}

	long getPointer() throws IOException {
		return ttf.getFilePointer() - offset;
	}

	// ---------- Simple Data Types --------------

	public int readByte() throws IOException {
		return ttf.readUnsignedByte();
	}

	public int readRawByte() throws IOException {
		return ttf.readByte() & 255;
	}

	public short readShort() throws IOException {
		return ttf.readShort();
	}

	public int readUShort() throws IOException {
		return ttf.readUnsignedShort();
	}

	public int readLong() throws IOException {
		return ttf.readInt();
	}

	public long readULong() throws IOException {
		byte[] temp = new byte[4];
		ttf.readFully(temp);
		long l = 0;
		long weight = 1;
		for (int i = 0; i < temp.length; i++) {
			//l |= (temp[3-i]&255) << (8*i);
			l += (temp[3 - i] & 255) * weight;
			weight *= 256;
		}
		return l;
	}

	public byte readChar() throws IOException {
		return ttf.readByte();
	}

	// ---------------- Arrays -------------------

	public void readFully(byte[] b) throws IOException {
		ttf.readFully(b);
	}

	public String toString() {
		return offset + "-" + (offset + length - 1);
	}
	
	/**
	 * @see org.jnode.awt.font.truetype.TTFInput#close()
	 * @throws IOException
	 */
	public void close()
	throws IOException {
		super.close();
		ttf.close();
	}

}