/**
* Read a single byte.
*
* @return The byte read, or -1 on end of file.
* @throws IOException
*/
public int read() throws IOException {
// return read(nfd.getNativeFD());
int result = FileSystem.readByte(nfd.getNativeFD());
if (result < -1) {
throw new IOException("Error code " + Integer.toString(result));
}
return result;
}
/**
* Read a byte buffer, given a starting position and length. Looks at the type of buffer and
* decides which is the fastest way to perform the write. If the buffer is backed by a byte array,
* use the internal method, otherwise push it out to classpath's native function (the slow way).
*
* @param dst
* @param pos
* @param len
* @return the number of bytes actually read
* @throws IOException
*/
private int read(ByteBuffer dst, int pos, int len) throws IOException {
int bytes;
if (len == 1) {
int b = FileSystem.readByte(nfd.getNativeFD());
if (b >= 0) {
dst.put((byte) (b & 0xFF));
dst.position(pos + 1);
return 1;
} else bytes = b;
} else if (dst.hasArray()) {
bytes = read(dst.array(), pos, len);
} else {
return read(nfd.getNativeFD(), dst);
}
if (bytes > 0) dst.position(pos + bytes);
return bytes;
}