protected Header readHeaderFromBuffer(ByteBuffer buffer) throws WWRuntimeException {
// Read file code - first byte
int fileCode = buffer.get();
if (fileCode > 5) {
String message = Logging.getMessage("SHP.NotADBaseFile", file.getPath());
Logging.logger().log(java.util.logging.Level.SEVERE, message);
throw new WWRuntimeException(message);
}
// Last update date
int yy = 0xFF & buffer.get(); // unsigned
int mm = buffer.get();
int dd = buffer.get();
// Number of records
int numRecords = buffer.getInt();
// Header struct length
int headerLength = buffer.getShort();
// Record length
int recordLength = buffer.getShort();
// Assemble header
Header header = new Header();
header.fileCode = fileCode;
Calendar cal = Calendar.getInstance();
cal.set(1900 + yy, mm - 1, dd);
header.lastModificationDate = cal.getTime();
header.numberOfRecords = numRecords;
header.headerLength = headerLength;
header.recordLength = recordLength;
return header;
}
/**
* Read block from file.
*
* @param file - File to read.
* @param off - Marker position in file to start read from if {@code -1} read last blockSz bytes.
* @param blockSz - Maximum number of chars to read.
* @param lastModified - File last modification time.
* @return Read file block.
* @throws IOException In case of error.
*/
public static VisorFileBlock readBlock(File file, long off, int blockSz, long lastModified)
throws IOException {
RandomAccessFile raf = null;
try {
long fSz = file.length();
long fLastModified = file.lastModified();
long pos = off >= 0 ? off : Math.max(fSz - blockSz, 0);
// Try read more that file length.
if (fLastModified == lastModified && fSz != 0 && pos >= fSz)
throw new IOException(
"Trying to read file block with wrong offset: " + pos + " while file size: " + fSz);
if (fSz == 0)
return new VisorFileBlock(file.getPath(), pos, fLastModified, 0, false, EMPTY_FILE_BUF);
else {
int toRead = Math.min(blockSz, (int) (fSz - pos));
byte[] buf = new byte[toRead];
raf = new RandomAccessFile(file, "r");
raf.seek(pos);
int cntRead = raf.read(buf, 0, toRead);
if (cntRead != toRead)
throw new IOException(
"Count of requested and actually read bytes does not match [cntRead="
+ cntRead
+ ", toRead="
+ toRead
+ ']');
boolean zipped = buf.length > 512;
return new VisorFileBlock(
file.getPath(), pos, fSz, fLastModified, zipped, zipped ? zipBytes(buf) : buf);
}
} finally {
U.close(raf, null);
}
}
public List<DBaseRecord> getRecords() {
if (this.records == null && this.getFile() != null) {
File file = this.getFile();
try {
this.records = this.readRecordsFromFile(file);
} catch (Exception e) {
String message = Logging.getMessage("SHP.ExceptionAttemptingToReadFile", file.getPath());
Logging.logger().log(java.util.logging.Level.SEVERE, message, e);
throw new WWRuntimeException(message, e);
}
}
return this.records;
}
public DBaseFile(File file) {
if (file == null) {
String message = Logging.getMessage("nullValue.FileIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
this.file = file;
try {
this.header = this.readHeaderFromFile(file);
this.fields = this.readFieldsFromBuffer(this.header.fieldsHeaderBuffer);
// Delay records loading until getRecords() is called.
} catch (Exception e) {
String message = Logging.getMessage("SHP.ExceptionAttemptingToReadFile", file.getPath());
Logging.logger().log(java.util.logging.Level.SEVERE, message, e);
throw new WWRuntimeException(message, e);
}
}
public static void unhideFile(File path) throws IOException, InterruptedException {
String[] args = {path.getPath()};
Process p = Runtime.getRuntime().exec(args);
p.waitFor();
}
