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chenjinsong
313
src/com/nis/nmsclient/util/file/BufferedRandomAccessFile.java
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313
src/com/nis/nmsclient/util/file/BufferedRandomAccessFile.java
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package com.nis.nmsclient.util.file;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.RandomAccessFile;
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import java.util.ResourceBundle;
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/**
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* <p>Title: BufferedRandomAccessFile</p>
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* <p>Description: this class provide Buffered Read & Write by extend RandomAccessFile</p>
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* <p>Copyright: Copyright (c) 2002 Cui Zhixiang </p>
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* <p>Company: soho </p>
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* @author Cui Zhixiang
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* @version 1.0, 2002/10/12
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*/
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public class BufferedRandomAccessFile extends RandomAccessFile {
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static ResourceBundle res = ResourceBundle.getBundle(Res.class.getName());
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private static final int DEFAULT_BUFFER_BIT_LEN = 10;
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private static final int DEFAULT_BUFFER_SIZE = 1 << DEFAULT_BUFFER_BIT_LEN;
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protected byte buf[];
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protected int bufbitlen;
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protected int bufsize;
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protected long bufmask;
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protected boolean bufdirty;
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protected int bufusedsize;
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protected long curpos;
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protected long bufstartpos;
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protected long bufendpos;
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protected long fileendpos;
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protected boolean append;
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protected String filename;
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protected long initfilelen;
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public BufferedRandomAccessFile(String name) throws IOException {
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this(name, res.getString("r"), DEFAULT_BUFFER_BIT_LEN);
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}
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public BufferedRandomAccessFile(File file) throws IOException, FileNotFoundException {
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this(file.getPath(), res.getString("r"), DEFAULT_BUFFER_BIT_LEN);
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}
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public BufferedRandomAccessFile(String name, int bufbitlen) throws IOException {
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this(name, res.getString("r"), bufbitlen);
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}
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public BufferedRandomAccessFile(File file, int bufbitlen) throws IOException, FileNotFoundException {
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this(file.getPath(), res.getString("r"), bufbitlen);
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}
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public BufferedRandomAccessFile(String name, String mode) throws IOException {
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this(name, mode, DEFAULT_BUFFER_BIT_LEN);
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}
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public BufferedRandomAccessFile(File file, String mode) throws IOException, FileNotFoundException {
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this(file.getPath(), mode, DEFAULT_BUFFER_BIT_LEN);
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}
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public BufferedRandomAccessFile(String name, String mode, int bufbitlen) throws IOException {
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super(name, mode);
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this.init(name, mode, bufbitlen);
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}
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public BufferedRandomAccessFile(File file, String mode, int bufbitlen) throws IOException, FileNotFoundException {
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this(file.getPath(), mode, bufbitlen);
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}
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private void init(String name, String mode, int bufbitlen) throws IOException {
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if (mode.equals(res.getString("r")) == true) {
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this.append = false;
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} else {
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this.append = true;
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}
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this.filename = name;
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this.initfilelen = super.length();
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this.fileendpos = this.initfilelen - 1;
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this.curpos = super.getFilePointer();
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if (bufbitlen < 0) {
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throw new IllegalArgumentException(res.getString("bufbitlen_size_must_0"));
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}
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this.bufbitlen = bufbitlen;
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this.bufsize = 1 << bufbitlen;
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this.buf = new byte[this.bufsize];
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this.bufmask = ~((long)this.bufsize - 1L);
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this.bufdirty = false;
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this.bufusedsize = 0;
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this.bufstartpos = -1;
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this.bufendpos = -1;
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}
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private void flushbuf() throws IOException {
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if (this.bufdirty == true) {
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if (super.getFilePointer() != this.bufstartpos) {
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super.seek(this.bufstartpos);
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}
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super.write(this.buf, 0, this.bufusedsize);
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this.bufdirty = false;
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}
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}
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private int fillbuf() throws IOException {
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super.seek(this.bufstartpos);
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this.bufdirty = false;
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return super.read(this.buf);
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}
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public byte read(long pos) throws IOException {
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if (pos < this.bufstartpos || pos > this.bufendpos) {
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this.flushbuf();
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this.seek(pos);
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if ((pos < this.bufstartpos) || (pos > this.bufendpos)) {
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throw new IOException();
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}
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}
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this.curpos = pos;
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return this.buf[(int)(pos - this.bufstartpos)];
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}
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public boolean write(byte bw) throws IOException {
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return this.write(bw, this.curpos);
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}
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public boolean append(byte bw) throws IOException {
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return this.write(bw, this.fileendpos + 1);
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}
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public boolean write(byte bw, long pos) throws IOException {
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if ((pos >= this.bufstartpos) && (pos <= this.bufendpos)) { // write pos in buf
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this.buf[(int)(pos - this.bufstartpos)] = bw;
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this.bufdirty = true;
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if (pos == this.fileendpos + 1) { // write pos is append pos
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this.fileendpos++;
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this.bufusedsize++;
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}
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} else { // write pos not in buf
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this.seek(pos);
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if ((pos >= 0) && (pos <= this.fileendpos) && (this.fileendpos != 0)) { // write pos is modify file
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this.buf[(int)(pos - this.bufstartpos)] = bw;
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} else if (((pos == 0) && (this.fileendpos == 0)) || (pos == this.fileendpos + 1)) { // write pos is append pos
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this.buf[0] = bw;
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this.fileendpos++;
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this.bufusedsize = 1;
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} else {
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throw new IndexOutOfBoundsException();
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}
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this.bufdirty = true;
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}
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this.curpos = pos;
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return true;
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}
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public void write(byte b[], int off, int len) throws IOException {
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long writeendpos = this.curpos + len - 1;
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if (writeendpos <= this.bufendpos) { // b[] in cur buf
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System.arraycopy(b, off, this.buf, (int)(this.curpos - this.bufstartpos), len);
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this.bufdirty = true;
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this.bufusedsize = (int)(writeendpos - this.bufstartpos + 1);//(int)(this.curpos - this.bufstartpos + len - 1);
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} else { // b[] not in cur buf
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super.seek(this.curpos);
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super.write(b, off, len);
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}
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if (writeendpos > this.fileendpos)
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this.fileendpos = writeendpos;
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this.seek(writeendpos+1);
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}
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public int read(byte b[], int off, int len) throws IOException {
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long readendpos = this.curpos + len - 1;
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if (readendpos <= this.bufendpos && readendpos <= this.fileendpos ) { // read in buf
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System.arraycopy(this.buf, (int)(this.curpos - this.bufstartpos), b, off, len);
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} else { // read b[] size > buf[]
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if (readendpos > this.fileendpos) { // read b[] part in file
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len = (int)(this.length() - this.curpos + 1);
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}
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super.seek(this.curpos);
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len = super.read(b, off, len);
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readendpos = this.curpos + len - 1;
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}
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this.seek(readendpos + 1);
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return len;
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}
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public void write(byte b[]) throws IOException {
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this.write(b, 0, b.length);
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}
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public int read(byte b[]) throws IOException {
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return this.read(b, 0, b.length);
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}
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public void seek(long pos) throws IOException {
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if ((pos < this.bufstartpos) || (pos > this.bufendpos)) { // seek pos not in buf
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this.flushbuf();
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if ((pos >= 0) && (pos <= this.fileendpos) && (this.fileendpos != 0)) { // seek pos in file (file length > 0)
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this.bufstartpos = pos & this.bufmask;
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this.bufusedsize = this.fillbuf();
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} else if (((pos == 0) && (this.fileendpos == 0)) || (pos == this.fileendpos + 1)) { // seek pos is append pos
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this.bufstartpos = pos;
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this.bufusedsize = 0;
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}
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this.bufendpos = this.bufstartpos + this.bufsize - 1;
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}
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this.curpos = pos;
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}
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public long length() throws IOException {
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return this.max(this.fileendpos + 1, this.initfilelen);
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}
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public void setLength(long newLength) throws IOException {
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if (newLength > 0) {
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this.fileendpos = newLength - 1;
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} else {
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this.fileendpos = 0;
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}
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super.setLength(newLength);
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}
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public long getFilePointer() throws IOException {
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return this.curpos;
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}
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private long max(long a, long b) {
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if (a > b) return a;
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return b;
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}
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public void close() throws IOException {
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this.flushbuf();
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super.close();
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}
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public static void main(String[] args) throws IOException {
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long readfilelen = 0;
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BufferedRandomAccessFile brafReadFile, brafWriteFile;
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brafReadFile = new BufferedRandomAccessFile("C:\\WINNT\\Fonts\\STKAITI.TTF");
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readfilelen = brafReadFile.initfilelen;
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brafWriteFile = new BufferedRandomAccessFile(".\\STKAITI.001", "rw", 10);
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byte buf[] = new byte[1024];
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int readcount;
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long start = System.currentTimeMillis();
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while((readcount = brafReadFile.read(buf)) != -1) {
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brafWriteFile.write(buf, 0, readcount);
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}
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brafWriteFile.close();
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brafReadFile.close();
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System.out.println("BufferedRandomAccessFile Copy & Write File: "
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+ brafReadFile.filename
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+ " FileSize: "
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+ java.lang.Integer.toString((int)readfilelen >> 1024)
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+ " (KB) "
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+ "Spend: "
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+(double)(System.currentTimeMillis()-start) / 1000
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+ "(s)");
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java.io.FileInputStream fdin = new java.io.FileInputStream("C:\\WINNT\\Fonts\\STKAITI.TTF");
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java.io.BufferedInputStream bis = new java.io.BufferedInputStream(fdin, 1024);
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java.io.DataInputStream dis = new java.io.DataInputStream(bis);
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java.io.FileOutputStream fdout = new java.io.FileOutputStream(".\\STKAITI.002");
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java.io.BufferedOutputStream bos = new java.io.BufferedOutputStream(fdout, 1024);
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java.io.DataOutputStream dos = new java.io.DataOutputStream(bos);
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start = System.currentTimeMillis();
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for (int i = 0; i < readfilelen; i++) {
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dos.write(dis.readByte());
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}
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dos.close();
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dis.close();
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System.out.println("DataBufferedios Copy & Write File: "
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+ brafReadFile.filename
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+ " FileSize: "
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+ java.lang.Integer.toString((int)readfilelen >> 1024)
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+ " (KB) "
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+ "Spend: "
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+ (double)(System.currentTimeMillis()-start) / 1000
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+ "(s)");
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}
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}
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