/**
* reads the content of an existing file using the current domain
*
* @param domain The namespace used to identify the application domain (1st level directory) to
* use
* @param path The path relative to the domain for the file
* @param offset the offset from the beginning of the file.
* @param len The length of the block in bytes
* @return The contents of the file
*/
public byte[] readByteFromFile(String path, long offset, int len)
throws EOFException, FileAccessException {
try {
if (_isLocal) {
File tmpFile = new File(_rootFile.getCanonicalPath() + File.separatorChar + path);
if (tmpFile.isFile()) {
RandomAccessFile raf = new RandomAccessFile(tmpFile, "r");
byte[] buffer = new byte[len];
raf.seek(offset);
int totalByteRead = 0;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int result = 0;
while (totalByteRead < len && raf.getFilePointer() < raf.length()) {
result = raf.read(buffer, 0, (len - totalByteRead));
if (result != -1) {
out.write(buffer, 0, result);
totalByteRead += result;
} else if (totalByteRead == 0) throw new EOFException("End of file reached!");
else break;
}
raf.close();
out.flush();
out.close();
return out.toByteArray();
} else throw new FileAccessException("Path is not a file");
} else return _remote.readByteFromFile(_domain, path, offset, len);
} catch (EOFException eofe) {
throw eofe;
} catch (FileAccessException fae) {
throw fae;
} catch (Exception e) {
throw new FileAccessException(e);
}
}
