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com.webcodepro.shrinkit.ThreadRecord Maven / Gradle / Ivy

package com.webcodepro.shrinkit;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

import com.webcodepro.shrinkit.io.LittleEndianByteInputStream;
import com.webcodepro.shrinkit.io.NufxLzw1InputStream;
import com.webcodepro.shrinkit.io.NufxLzw2InputStream;

/**
 * This represents a single thread from the Shrinkit archive.
 * As it is constructed, the thread "header" is read.  Once all
 * threads have been constructed, use readThreadData
 * to load up the data.
 * 

* Depending on the type of thread, the data may be text. If so, * isText will return true and getText * will return the string. Otherwise the data should be read through * one of the InputStream options. * * @author [email protected] */ public class ThreadRecord { private ThreadClass threadClass; private ThreadFormat threadFormat; private ThreadKind threadKind; private int threadCrc; private long threadEof; private long compThreadEof; private byte[] threadData; /** * Construct the ThreadRecord and read the header details with no hints * from the Header Block. */ public ThreadRecord(LittleEndianByteInputStream bs) throws IOException { this(null, bs); } /** * Construct the ThreadRecord and read the header details. */ public ThreadRecord(HeaderBlock hb, LittleEndianByteInputStream bs) throws IOException { threadClass = ThreadClass.find(bs.readWord()); threadFormat = ThreadFormat.find(bs.readWord()); threadKind = ThreadKind.find(bs.readWord(), threadClass); threadCrc = bs.readWord(); threadEof = bs.readLong(); compThreadEof = bs.readLong(); if ((threadKind == ThreadKind.DISK_IMAGE) && (hb != null)) { /* If we have hints from the header block, repair some disk image related bugs. */ if (hb.getStorageType() <= 13 ) { /* supposed to be block size, but SHK v3.0.1 stored it wrong */ threadEof = hb.getExtraType() * 512; // System.out.println("Found erroneous storage type... fixing."); } else if (hb.getStorageType() == 256 && hb.getExtraType() == 280 && hb.getFileSysId() == 2 ) { // FileSysDOS33 /* * Fix for less-common ShrinkIt problem: looks like an old * version of GS/ShrinkIt used 256 as the block size when * compressing DOS 3.3 images from 5.25" disks. If that * appears to be the case here, crank up the block size. */ threadEof = hb.getExtraType() * 512; } else { threadEof = hb.getExtraType() * hb.getStorageType(); } } } /** * Read the raw thread data. This must be called. */ public void readThreadData(LittleEndianByteInputStream bs) throws IOException { threadData = bs.readBytes((int)compThreadEof); } /** * Determine if this is a text-type field. */ public boolean isText() { return threadKind == ThreadKind.ASCII_TEXT || threadKind == ThreadKind.FILENAME; } /** * Return the text data. */ public String getText() { return isText() ? new String(threadData, 0, (int)threadEof) : null; } /** * Get raw data bytes (compressed). */ public byte[] getBytes() { return threadData; } /** * Get the raw data input stream. */ public InputStream getRawInputStream() { return new ByteArrayInputStream(threadData); } /** * Get the appropriate input data stream for this thread to decompress the contents. */ public InputStream getInputStream() throws IOException { switch (threadFormat) { case UNCOMPRESSED: return getRawInputStream(); case DYNAMIC_LZW1: return new NufxLzw1InputStream(new LittleEndianByteInputStream(getRawInputStream())); case DYNAMIC_LZW2: return new NufxLzw2InputStream(new LittleEndianByteInputStream(getRawInputStream())); default: throw new IOException("The thread format " + threadFormat + " does not have an InputStream associated with it!"); } } // GENERATED CODE public ThreadClass getThreadClass() { return threadClass; } public void setThreadClass(ThreadClass threadClass) { this.threadClass = threadClass; } public ThreadFormat getThreadFormat() { return threadFormat; } public void setThreadFormat(ThreadFormat threadFormat) { this.threadFormat = threadFormat; } public ThreadKind getThreadKind() { return threadKind; } public void setThreadKind(ThreadKind threadKind) { this.threadKind = threadKind; } public int getThreadCrc() { return threadCrc; } public void setThreadCrc(int threadCrc) { this.threadCrc = threadCrc; } public long getThreadEof() { return threadEof; } public void setThreadEof(long threadEof) { this.threadEof = threadEof; } public long getCompThreadEof() { return compThreadEof; } public void setCompThreadEof(long compThreadEof) { this.compThreadEof = compThreadEof; } public byte[] getThreadData() { return threadData; } public void setThreadData(byte[] threadData) { this.threadData = threadData; } }





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