/**
* Constructs a DBFHeader, read the data from file <br>
* You need to supply an open file handle to read from
*
* @param ff open file handle for read access
*/
DBFHeader(RandomAccessFile ff) throws tinySQLException {
try {
ff.seek(FLAG_INDEX);
file_type = Utils.fixByte(ff.readByte());
// get the last update date
file_update_year = Utils.fixByte(ff.readByte());
file_update_month = Utils.fixByte(ff.readByte());
file_update_day = Utils.fixByte(ff.readByte());
// a byte array to hold little-endian long data
//
byte[] b = new byte[4];
// read that baby in...
//
ff.readFully(b);
// convert the byte array into a long (really a double)
// 4-7 number of records
numRecords = (int) Utils.vax_to_long(b);
// a byte array to hold little-endian short data
//
b = new byte[2];
// get the data position (where it starts in the file)
// 8-9 Length of header
ff.readFully(b);
headerLength = Utils.vax_to_short(b);
// find out the length of the data portion
// 10-11 Length of Record
ff.readFully(b);
recordLength = Utils.vax_to_short(b);
// calculate the number of fields
//
numFields = (headerLength - 33) / 32;
// skip the next 20 bytes - looks like this is not needed...
// ff.skipBytes(20);
// 12-31 reserved
Utils.log("HEADER=" + this.toString());
} catch (Exception e) {
throw new tinySQLException(e.getMessage());
}
}
public void loadMetaData() throws IOException {
pageFile.seek(offset);
nextPageId = pageFile.readInt();
currentFill = pageFile.readInt();
bloomfilter = pageFile.readInt();
type = pageFile.readByte();
}
private int peek() throws IOException {
if (checkPos(this.pointer)) {
buf.seek(pointer++);
return b2i(buf.readByte());
} else {
return -1;
}
}
/*
* gets an (uncompressed) stream representing the chunk data returns null if
* the chunk is not found or an error occurs
*/
public synchronized DataInputStream getChunkDataInputStream(int x, int z) {
if (outOfBounds(x, z)) {
debugln("READ", x, z, "out of bounds");
return null;
}
try {
int offset = getOffset(x, z);
if (offset == 0) {
// debugln("READ", x, z, "miss");
return null;
}
int sectorNumber = offset >> 8;
int numSectors = offset & 0xFF;
if (sectorNumber + numSectors > sectorFree.size()) {
debugln("READ", x, z, "invalid sector");
return null;
}
file.seek(sectorNumber * SECTOR_BYTES);
int length = file.readInt();
if (length > SECTOR_BYTES * numSectors) {
debugln("READ", x, z, "invalid length: " + length + " > 4096 * " + numSectors);
return null;
}
byte version = file.readByte();
if (version == VERSION_GZIP) {
byte[] data = new byte[length - 1];
file.read(data);
DataInputStream ret =
new DataInputStream(
new BufferedInputStream(new GZIPInputStream(new ByteArrayInputStream(data))));
// debug("READ", x, z, " = found");
return ret;
} else if (version == VERSION_DEFLATE) {
byte[] data = new byte[length - 1];
file.read(data);
DataInputStream ret =
new DataInputStream(
new BufferedInputStream(new InflaterInputStream(new ByteArrayInputStream(data))));
// debug("READ", x, z, " = found");
return ret;
}
debugln("READ", x, z, "unknown version " + version);
return null;
} catch (IOException e) {
debugln("READ", x, z, "exception");
return null;
}
}
public static long checksumRandomAccessFile(Path filename) throws IOException {
try (RandomAccessFile file = new RandomAccessFile(filename.toFile(), "r")) {
long length = file.length();
CRC32 crc = new CRC32();
for (long p = 0; p < length; p++) {
file.seek(p);
int c = file.readByte();
crc.update(c);
}
return crc.getValue();
}
}
public int read(byte[] b) throws IOException {
if (buf == null) throw new IOException("Data buffer not initialized.");
if (pointer < 0 || pointer >= length) return -1;
int length = this.length - (int) pointer;
if (length > b.length) length = b.length;
for (int i = 0; i < length; i++) {
buf.seek(pointer++);
b[i] = buf.readByte();
}
return length;
}
public PSTFile(File fileName) throws FileNotFoundException, PSTException, IOException {
// attempt to open the file.
in = new RandomAccessFile(fileName, "r");
// get the first 4 bytes, should be !BDN
try {
byte[] temp = new byte[4];
in.read(temp);
String strValue = new String(temp);
if (!strValue.equals("!BDN")) {
throw new PSTException("Invalid file header: " + strValue + ", expected: !BDN");
}
// make sure we are using a supported version of a PST...
byte[] fileTypeBytes = new byte[2];
in.seek(10);
in.read(fileTypeBytes);
// ANSI file types can be 14 or 15:
if (fileTypeBytes[0] == PSTFile.PST_TYPE_ANSI_2) {
fileTypeBytes[0] = PSTFile.PST_TYPE_ANSI;
}
if (fileTypeBytes[0] != PSTFile.PST_TYPE_ANSI
&& fileTypeBytes[0] != PSTFile.PST_TYPE_UNICODE) {
throw new PSTException("Unrecognised PST File version: " + fileTypeBytes[0]);
}
this.pstFileType = fileTypeBytes[0];
// make sure encryption is turned off at this stage...
if (this.getPSTFileType() == PST_TYPE_ANSI) {
in.seek(461);
} else {
in.seek(513);
}
encryptionType = in.readByte();
if (encryptionType == 0x02) {
throw new PSTException(
"Only unencrypted and compressable PST files are supported at this time");
}
// build out name to id map.
processNameToIdMap(in);
} catch (IOException err) {
throw new PSTException("Unable to read PST Sig", err);
}
}
// see DbFile.java for javadocs
public Page readPage(PageId pid) {
// some code goes here
if (pid.pageNumber() >= numPages()) {
throw new IllegalArgumentException("page not in file");
}
Page returnme = null;
byte[] data = HeapPage.createEmptyPageData();
long offset = (long) BufferPool.PAGE_SIZE * pid.pageNumber();
try {
raf.seek(offset);
for (int i = 0; i < data.length; i++) {
data[i] = raf.readByte();
}
returnme = new HeapPage((HeapPageId) pid, data);
} catch (EOFException eofe) {
eofe.printStackTrace();
} catch (IOException ioe) {
ioe.printStackTrace();
}
return returnme;
}
/**
* Repairs the chunk region file Returns -1 if the file had to be removed Returns -2 if we had no
* access Returns -3 if file removal failed (from -1) Returns the amount of changed chunks
* otherwise
*
* @param chunkfile
* @param backupfolder
* @return
*/
public static int repairRegion(File chunkfile, File backupfolder) {
MyWorlds.log(Level.INFO, "Performing repairs on region file: " + chunkfile.getName());
RandomAccessFile raf = null;
try {
raf = new RandomAccessFile(chunkfile, "rw");
File backupfile = new File(backupfolder + File.separator + chunkfile.getName());
int[] locations = new int[1024];
for (int i = 0; i < 1024; i++) {
locations[i] = raf.readInt();
}
// Validate the data
int editcount = 0;
for (int i = 0; i < locations.length; i++) {
int location = locations[i];
if (location == 0) continue;
try {
int offset = location >> 8;
int size = location & 255;
raf.seek((long) (offset * 4096));
int length = raf.readInt();
// Read and test the data
if (length > 4096 * size) {
editcount++;
locations[i] = 0;
MyWorlds.log(Level.WARNING, "Invalid length: " + length + " > 4096 * " + size);
// Invalid length
} else if (size > 0 && length > 0) {
byte version = raf.readByte();
byte[] data = new byte[length - 1];
raf.read(data);
ByteArrayInputStream bais = new ByteArrayInputStream(data);
// Try to load it all...
DataInputStream stream;
if (version == 1) {
stream = new DataInputStream(new GZIPInputStream(bais));
} else if (version == 2) {
stream = new DataInputStream(new InflaterInputStream(bais));
} else {
stream = null;
// Unknown version
MyWorlds.log(
Level.WARNING,
"Unknown region version: " + version + " (we probably need an update here!)");
}
if (stream != null) {
// Validate the stream and close
try {
NBTBase base = NBTTagCompound.b((DataInput) stream);
if (base == null) {
editcount++;
locations[i] = 0;
MyWorlds.log(Level.WARNING, "Invalid tag compount at chunk " + i);
} else if (!(base instanceof NBTTagCompound)) {
editcount++;
locations[i] = 0;
MyWorlds.log(Level.WARNING, "Invalid tag compount at chunk " + i);
}
} catch (Exception ex) {
// Invalid.
editcount++;
locations[i] = 0;
MyWorlds.log(Level.WARNING, "Stream " + i);
ex.printStackTrace();
}
stream.close();
}
}
} catch (Exception ex) {
editcount++;
locations[i] = 0;
ex.printStackTrace();
}
}
if (editcount > 0) {
if (backupfolder.mkdirs() && copy(chunkfile, backupfile)) {
// Write out the new locations
raf.seek(0);
for (int location : locations) {
raf.writeInt(location);
}
} else {
MyWorlds.log(Level.WARNING, "Failed to make a copy of the file, no changes are made.");
return -2;
}
}
// Done.
raf.close();
return editcount;
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
if (raf != null) raf.close();
} catch (Exception ex) {
}
try {
chunkfile.delete();
return -1;
} catch (Exception ex) {
return -3;
}
}
