com.webcodepro.shrinkit.MasterHeaderBlock Maven / Gradle / Ivy
package com.webcodepro.shrinkit;
import java.io.IOException;
import java.util.Date;
import com.webcodepro.shrinkit.io.ByteConstants;
import com.webcodepro.shrinkit.io.LittleEndianByteInputStream;
/**
* The Master Header Block contains information about the entire
* ShrinkIt archive.
*
* Note that we need to support multiple versions of the NuFX
* archive format. Some details may be invalid, depending on
* version, and those are documented in the getter methods.
*
* @author [email protected]
* @see Apple II File Type Note $E0/$8002
*/
public class MasterHeaderBlock {
private static final int MASTER_HEADER_LENGTH = 48;
private int masterCrc;
private boolean validCrc;
private long totalRecords;
private Date archiveCreateWhen;
private Date archiveModWhen;
private int masterVersion;
private long masterEof;
/**
* Create the Master Header Block, based on the LittleEndianByteInputStream.
*/
public MasterHeaderBlock(LittleEndianByteInputStream bs) throws IOException {
int fileType = 0, headerOffset = 0;
fileType = bs.seekFileType();
if (fileType == NuFileArchive.BXY_ARCHIVE) {
bs.readBytes(127 - ByteConstants.NUFILE_ID.length);
headerOffset = 128;
int count = bs.read();
if (count != 0) {
throw new IOException("This is actually a Binary II archive with multiple files in it."); // FIXME - NLS
}
fileType = bs.seekFileType();
}
if (!(fileType == NuFileArchive.NUFILE_ARCHIVE)) {
throw new IOException("Unable to decode this archive."); // FIXME - NLS
}
masterCrc = bs.readWord();
bs.resetCrc(); // CRC is computed from this point to the end of the header
totalRecords = bs.readLong();
archiveCreateWhen = bs.readDate();
archiveModWhen = bs.readDate();
masterVersion = bs.readWord();
if (masterVersion > 0) {
bs.readBytes(8); // documented to be null, but we don't care
masterEof = bs.readLong();
} else {
masterEof = -1;
}
// Read whatever remains of the fixed size header
while (bs.getTotalBytesRead() < MASTER_HEADER_LENGTH + headerOffset) {
bs.readByte();
}
validCrc = (masterCrc == bs.getCrcValue());
}
// GENERATED CODE
public int getMasterCrc() {
return masterCrc;
}
public void setMasterCrc(int masterCrc) {
this.masterCrc = masterCrc;
}
public long getTotalRecords() {
return totalRecords;
}
public void setTotalRecords(long totalRecords) {
this.totalRecords = totalRecords;
}
public Date getArchiveCreateWhen() {
return archiveCreateWhen;
}
public void setArchiveCreateWhen(Date archiveCreateWhen) {
this.archiveCreateWhen = archiveCreateWhen;
}
public Date getArchiveModWhen() {
return archiveModWhen;
}
public void setArchiveModWhen(Date archiveModWhen) {
this.archiveModWhen = archiveModWhen;
}
public int getMasterVersion() {
return masterVersion;
}
public void setMasterVersion(int masterVersion) {
this.masterVersion = masterVersion;
}
public long getMasterEof() {
return masterEof;
}
public void setMasterEof(long masterEof) {
this.masterEof = masterEof;
}
public boolean isValidCrc() {
return validCrc;
}
}