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MobiFileReader.java
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package org.bandarra.mobireader;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
/**
*
* @author andreban
*/
public class MobiFileReader {
public MobiFileReader() {
}
public MobiBook readFile(String fileName) throws IOException {
try (RandomAccessFile din = new RandomAccessFile(fileName, "r")) {
MobiBook book = new MobiBook();
PDBHeader header = new PDBHeader();
book.setPdbHeader(header);
byte[] buffer = new byte[1024];
din.read(buffer, 0, 32);
String databaseName = new String(buffer, 0, 32).trim();
header.setDatabaseName(databaseName);
header.setAttributes(din.readUnsignedShort());
header.setVersion(din.readUnsignedShort());
header.setCreationDate(din.readInt() & 0xFFFFFFFFL);
header.setModificationDate(din.readInt() & 0xFFFFFFFFL);
header.setLastBackupDate(din.readInt() & 0xFFFFFFFFL);
header.setModificationNumber(din.readInt() & 0xFFFFFFFFL);
header.setAppInfoId(din.readInt() & 0xFFFFFFFFL);
header.setSortInfoId(din.readInt() & 0xFFFFFFFFL);
din.read(buffer, 0, 4);
header.setType(new String(buffer, 0, 4));
din.read(buffer, 0, 4);
header.setCreator(new String(buffer, 0, 4));
header.setUniqueSeedID(din.readInt() & 0xFFFFFFFFL);
header.setNextRecordListID(din.readInt() & 0xFFFFFFFFL);
header.setNumberOfRecords(din.readUnsignedShort());
for (int i = 0; i < header.getNumberOfRecords(); i++) {
PDBRecordHeader recordHeader = new PDBRecordHeader();
recordHeader.setDataOffset(din.readInt() & 0xFFFFFFFFL);
recordHeader.setRecordAttributes(din.readByte());
din.skipBytes(3);
header.addPDBRecordHeader(recordHeader);
}
//Read PalmDOC Header
din.seek(header.getPDBRecordHeader(0).getDataOffset()); //seek to the first PDB Record
PalmDocHeader palmDocHeader = new PalmDocHeader();
book.setPalmDocHeader(palmDocHeader);
palmDocHeader.setCompression(din.readUnsignedShort());
din.skipBytes(2); //Unused Short (should be 0)
palmDocHeader.setTextLength(din.readInt() & 0xFFFFFFFFL);
palmDocHeader.setRecordCount(din.readUnsignedShort());
palmDocHeader.setRecordSize(din.readUnsignedShort());
palmDocHeader.setEncryption(din.readUnsignedShort());
din.skipBytes(2);
MobiHeader mobiHeader = new MobiHeader();
book.setMobiHeader(mobiHeader);
din.read(buffer, 0, 4);
String identifier = new String(buffer, 0, 4);
if (!"MOBI".equals(identifier)) {
throw new IOException("Invalid Mobi File. Identifier != MOBI");
}
mobiHeader.setLength(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setType(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setEncodingId(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setUniqueId(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setFileVersion(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setOrthographicIndex(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setInflectionIndex(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setIndexNames(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setIndexKeys(din.readInt() & 0xFFFFFFFFL);
for (int i = 0; i < 6; i++){
mobiHeader.setExtraIndex(i, din.readInt() & 0xFFFFFFFFL);
}
mobiHeader.setFirstNonBookIndex(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setFullNameOffset(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setFullNameLength(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setLocaleId(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setInputLanguageId(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setOutputLanguageId(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setMinVersion(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setFirstImageIndex(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setHuffmanRecordOffset(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setHuffmanRecordCount(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setHuffmanTableOffset(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setHuffmanTableLength(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setExthFlags(din.readInt() & 0xFFFFFFFFL);
din.skipBytes(32);//32 unknown bytes, if MOBI is long enough
din.skipBytes(4);//Unknown Int
mobiHeader.setDrmOffset(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setDrmCount(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setDrmSize(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setDrmFlags(din.readInt() & 0xFFFFFFFFL);
din.skipBytes(8);
mobiHeader.setFirstContentRecord(din.readUnsignedShort());
mobiHeader.setLastContentRecord(din.readUnsignedShort());
din.skipBytes(4);//unknown int
mobiHeader.setFcisRecordNumber(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setFcisRecordCount(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setFlisRecordNumber(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setFlisRecordCount(din.readInt() & 0xFFFFFFFFL);
din.skipBytes(8);
din.skipBytes(4);//Unknown Int
mobiHeader.setFirstCompilationDataSectionCount(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setNumCompilationDataSections(din.readInt() & 0xFFFFFFFFL);
din.skipBytes(4);//Unknown int
mobiHeader.setExtraRecordDataFlags(din.readInt() & 0xFFFFFFFFL);
mobiHeader.setIndxRecordOffset(din.readInt() & 0xFFFFFFFFL);
boolean hasEXTH = (mobiHeader.getExthFlags() & 0x40) > 0;
if (hasEXTH) {
din.read(buffer, 0, 4);
String exthIdentifier = new String(buffer, 0, 4);
if (!exthIdentifier.equals("EXTH")) {
din.skipBytes(12);//Undocumented Bytes
din.read(buffer, 0, 4);
exthIdentifier = new String(buffer, 0, 4);
if (!exthIdentifier.equals("EXTH")) {
din.skipBytes(4);
din.read(buffer, 0, 4);
exthIdentifier = new String(buffer, 0, 4);
if (!exthIdentifier.equals("EXTH")) {
throw new IOException("Invalid EXTH Identifier: " + exthIdentifier);
}
}
}
ExthHeader exthHeader = new ExthHeader();
book.setExthHeader(exthHeader);
exthHeader.setHeaderLength(din.readInt() & 0xFFFFFFFFL);
exthHeader.setRecordCount(din.readInt() & 0xFFFFFFFFL);
for (int i = 0; i < exthHeader.getRecordCount(); i++) {
ExthHeaderRecord record = new ExthHeaderRecord();
record.setRecordType(din.readInt() & 0xFFFFFFFFL);
record.setRecordLength(din.readInt() & 0xFFFFFFFFL);
int bytesToRead = (int)record.getRecordLength() - 8;
byte[] content = new byte[bytesToRead];
din.read(content, 0, bytesToRead);
record.setRawRecordData(content);
exthHeader.addRecord(record);
}
din.seek(header.getPDBRecordHeader(0).getDataOffset() + mobiHeader.getFullNameOffset());
din.read(buffer, 0, (int)mobiHeader.getFullNameLength());
}
book.setTitle(new String(buffer, 0, (int)mobiHeader.getFullNameLength()));
return book;
}
}
public static void main(String[] args) throws Exception {
MobiFileReader reader = new MobiFileReader();
Path p = Paths.get(args[0]);
SimpleFileVisitor<Path> fileVisitor = new SimpleFileVisitor<Path>() {
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
if (file.toString().endsWith(".mobi")) {
System.out.println("");
System.out.println(file);
MobiBook book = new MobiFileReader().readFile(file.toString());
System.out.println("Title: " + book.getTitle());
if (book.getExthHeader().getRecord(ExthHeader.RecordType.AUTHOR) != null) {
System.out.println("Author: " + book.getExthHeader().getRecord(ExthHeader.RecordType.AUTHOR).getString());
}
if (book.getExthHeader().getRecord(ExthHeader.RecordType.PUBLISHER) != null) {
System.out.println("Publisher: " + book.getExthHeader().getRecord(ExthHeader.RecordType.PUBLISHER).getString());
}
if (book.getExthHeader().getRecord(ExthHeader.RecordType.ISBN) != null) {
System.out.println("ISBN: " + book.getExthHeader().getRecord(ExthHeader.RecordType.ISBN).getString());
}
}
return FileVisitResult.CONTINUE;
}
};
Files.walkFileTree(p, fileVisitor);
}
}