package com.trydone.core.io;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.ResourceBundle;
/**
* <p>Title: BufferedRandomAccessFile</p>
* <p>Description: this class provide Buffered Read & Write by extend RandomAccessFile</p>
* <p>Copyright: Copyright (c) 2002 Cui Zhixiang </p>
* <p>Company: soho </p>
* @author Cui Zhixiang
* @version 1.0, 2002/10/12
*/
public class BufferedRandomAccessFile extends RandomAccessFile {
static ResourceBundle res = ResourceBundle.getBundle("com.trydone.core.io.res");
private static final int DEFAULT_BUFFER_BIT_LEN = 10;
protected byte buf[];
protected int bufbitlen;
protected int bufsize;
protected long bufmask;
protected boolean bufdirty;
protected int bufusedsize;
protected long curpos;
protected long bufstartpos;
protected long bufendpos;
protected long fileendpos;
protected boolean append;
protected String filename;
protected long initfilelen;
public BufferedRandomAccessFile(String name) throws IOException {
this(name, res.getString("r"), DEFAULT_BUFFER_BIT_LEN);
}
public BufferedRandomAccessFile(File file) throws IOException {
this(file.getPath(), res.getString("r"), DEFAULT_BUFFER_BIT_LEN);
}
public BufferedRandomAccessFile(String name, int bufbitlen) throws IOException {
this(name, res.getString("r"), bufbitlen);
}
public BufferedRandomAccessFile(File file, int bufbitlen) throws IOException {
this(file.getPath(), res.getString("r"), bufbitlen);
}
public BufferedRandomAccessFile(String name, String mode) throws IOException {
this(name, mode, DEFAULT_BUFFER_BIT_LEN);
}
public BufferedRandomAccessFile(File file, String mode) throws IOException {
this(file.getPath(), mode, DEFAULT_BUFFER_BIT_LEN);
}
public BufferedRandomAccessFile(String name, String mode, int bufbitlen) throws IOException {
super(name, mode);
this.init(name, mode, bufbitlen);
}
public BufferedRandomAccessFile(File file, String mode, int bufbitlen) throws IOException {
this(file.getPath(), mode, bufbitlen);
}
private void init(String name, String mode, int bufbitlen) throws IOException {
this.append = !mode.equals(res.getString("r"));
this.filename = name;
this.initfilelen = super.length();
this.fileendpos = this.initfilelen - 1;
this.curpos = super.getFilePointer();
if (bufbitlen < 0) {
throw new IllegalArgumentException(res.getString("bufbitlen_size_must_0"));
}
this.bufbitlen = bufbitlen;
this.bufsize = 1 << bufbitlen;
this.buf = new byte[this.bufsize];
this.bufmask = ~((long)this.bufsize - 1L);
this.bufdirty = false;
this.bufusedsize = 0;
this.bufstartpos = -1;
this.bufendpos = -1;
}
private void flushbuf() throws IOException {
if (this.bufdirty) {
if (super.getFilePointer() != this.bufstartpos) {
super.seek(this.bufstartpos);
}
super.write(this.buf, 0, this.bufusedsize);
this.bufdirty = false;
}
}
private int fillbuf() throws IOException {
super.seek(this.bufstartpos);
this.bufdirty = false;
return super.read(this.buf);
}
public byte read(long pos) throws IOException {
if (pos < this.bufstartpos || pos > this.bufendpos) {
this.flushbuf();
this.seek(pos);
if ((pos < this.bufstartpos) || (pos > this.bufendpos)) {
throw new IOException();
}
}
this.curpos = pos;
return this.buf[(int)(pos - this.bufstartpos)];
}
public boolean write(byte bw) throws IOException {
return this.write(bw, this.curpos);
}
public boolean append(byte bw) throws IOException {
return this.write(bw, this.fileendpos + 1);
}
public boolean write(byte bw, long pos) throws IOException {
if ((pos >= this.bufstartpos) && (pos <= this.bufendpos)) { // write pos in buf
this.buf[(int)(pos - this.bufstartpos)] = bw;
this.bufdirty = true;
if (pos == this.fileendpos + 1) { // write pos is append pos
this.fileendpos++;
this.bufusedsize++;
}
} else { // write pos not in buf
this.seek(pos);
if ((pos >= 0) && (pos <= this.fileendpos) && (this.fileendpos != 0)) { // write pos is modify file
this.buf[(int)(pos - this.bufstartpos)] = bw;
} else if (((pos == 0) && (this.fileendpos == 0)) || (pos == this.fileendpos + 1)) { // write pos is append pos
this.buf[0] = bw;
this.fileendpos++;
this.bufusedsize = 1;
} else {
throw new IndexOutOfBoundsException();
}
this.bufdirty = true;
}
this.curpos = pos;
return true;
}
public void write(byte b[], int off, int len) throws IOException {
long writeendpos = this.curpos + len - 1;
if (writeendpos <= this.bufendpos) { // b[] in cur buf
System.arraycopy(b, off, this.buf, (int)(this.curpos - this.bufstartpos), len);
this.bufdirty = true;
this.bufusedsize = (int)(writeendpos - this.bufstartpos + 1);//(int)(this.curpos - this.bufstartpos + len - 1);
} else { // b[] not in cur buf
super.seek(this.curpos);
super.write(b, off, len);
}
if (writeendpos > this.fileendpos)
this.fileendpos = writeendpos;
this.seek(writeendpos+1);
}
public int read(byte b[], int off, int len) throws IOException {
long readendpos = this.curpos + len - 1;
if (readendpos <= this.bufendpos && readendpos <= this.fileendpos ) { // read in buf
System.arraycopy(this.buf, (int)(this.curpos - this.bufstartpos), b, off, len);
} else { // read b[] size > buf[]
if (readendpos > this.fileendpos) { // read b[] part in file
len = (int)(this.length() - this.curpos + 1);
}
super.seek(this.curpos);
len = super.read(b, off, len);
readendpos = this.curpos + len - 1;
}
this.seek(readendpos + 1);
return len;
}
public void write(byte b[]) throws IOException {
this.write(b, 0, b.length);
}
public int read(byte b[]) throws IOException {
return this.read(b, 0, b.length);
}
public void seek(long pos) throws IOException {
if ((pos < this.bufstartpos) || (pos > this.bufendpos)) { // seek pos not in buf
this.flushbuf();
if ((pos >= 0) && (pos <= this.fileendpos) && (this.fileendpos != 0)) { // seek pos in file (file length > 0)
this.bufstartpos = pos & this.bufmask;
this.bufusedsize = this.fillbuf();
} else if (((pos == 0) && (this.fileendpos == 0)) || (pos == this.fileendpos + 1)) { // seek pos is append pos
this.bufstartpos = pos;
this.bufusedsize = 0;
}
this.bufendpos = this.bufstartpos + this.bufsize - 1;
}
this.curpos = pos;
}
public long length() throws IOException {
return this.max(this.fileendpos + 1, this.initfilelen);
}
public void setLength(long newLength) throws IOException {
if (newLength > 0) {
this.fileendpos = newLength - 1;
} else {
this.fileendpos = 0;
}
super.setLength(newLength);
}
public long getFilePointer() throws IOException {
return this.curpos;
}
private long max(long a, long b) {
if (a > b) return a;
return b;
}
public void close() throws IOException {
this.flushbuf();
super.close();
}
public static void main(String[] args) throws IOException {
long readfilelen;
BufferedRandomAccessFile brafReadFile, brafWriteFile;
brafReadFile = new BufferedRandomAccessFile("C:\\classes12.jar");
readfilelen = brafReadFile.initfilelen;
brafWriteFile = new BufferedRandomAccessFile(".\\STKAITI.001", "rw", 10);
byte buf[] = new byte[1024];
int readcount;
long start = System.currentTimeMillis();
while((readcount = brafReadFile.read(buf)) != -1) {
brafWriteFile.write(buf, 0, readcount);
}
brafWriteFile.close();
brafReadFile.close();
System.out.println("BufferedRandomAccessFile Copy & Write File: "
+ brafReadFile.filename
+ " FileSize: "
+ java.lang.Integer.toString((int)readfilelen / 1024)
+ " (KB) "
+ "Spend: "
+(double)(System.currentTimeMillis()-start) / 1000
+ "(s)");
java.io.FileInputStream fdin = new java.io.FileInputStream("C:\\classes12.jar");
java.io.BufferedInputStream bis = new java.io.BufferedInputStream(fdin, 1024);
java.io.DataInputStream dis = new java.io.DataInputStream(bis);
java.io.FileOutputStream fdout = new java.io.FileOutputStream(".\\STKAITI.002");
java.io.BufferedOutputStream bos = new java.io.BufferedOutputStream(fdout, 1024);
java.io.DataOutputStream dos = new java.io.DataOutputStream(bos);
start = System.currentTimeMillis();
for (int i = 0; i < readfilelen; i++) {
dos.write(dis.readByte());
}
dos.close();
dis.close();
System.out.println("DataBufferedios Copy & Write File: "
+ brafReadFile.filename
+ " FileSize: "
+ java.lang.Integer.toString((int)readfilelen /1024)
+ " (KB) "
+ "Spend: "
+ (double)(System.currentTimeMillis()-start) / 1000
+ "(s)");
}
}