/**
* Return a signed short read from the data.
*
* @param
* int the offset into the data. An offset of zero will
* return the first short available in the current allowed window.
* The last valid offset is equal to {@link getSize()}-2. Invalid
* offsets will result in a {@link PelDataWindowOffsetException}
* being thrown.
*
* @return int the signed short found at offset.
*/
public function getSShort($o = 0)
{
/*
* Validate the offset+1 to see if we can safely get two bytes ---
* this throws an exception if offset is out of range.
*/
$this->validateOffset($o);
$this->validateOffset($o + 1);
/* Translate the offset into an offset into the data. */
$o += $this->start;
/* Return a signed short. */
return PelConvert::bytesToSShort($this->data, $o, $this->order);
}
function testSShortBig()
{
$o = PelConvert::BIG_ENDIAN;
$this->assertEqual(PelConvert::bytesToSShort($this->bytes, 0, $o), 0);
$this->assertEqual(PelConvert::bytesToSShort($this->bytes, 1, $o), 0);
$this->assertEqual(PelConvert::bytesToSShort($this->bytes, 2, $o), 0);
$this->assertEqual(PelConvert::bytesToSShort($this->bytes, 3, $o), 1);
$this->assertEqual(PelConvert::bytesToSShort($this->bytes, 4, $o), 291);
$this->assertEqual(PelConvert::bytesToSShort($this->bytes, 5, $o), 9029);
$this->assertEqual(PelConvert::bytesToSShort($this->bytes, 6, $o), 17767);
$this->assertEqual(PelConvert::bytesToSShort($this->bytes, 7, $o), 26505);
$this->assertEqual(PelConvert::bytesToSShort($this->bytes, 8, $o), -30293);
$this->assertEqual(PelConvert::bytesToSShort($this->bytes, 9, $o), -21555);
$this->assertEqual(PelConvert::bytesToSShort($this->bytes, 10, $o), -12817);
$this->assertEqual(PelConvert::bytesToSShort($this->bytes, 11, $o), -4097);
$this->assertEqual(PelConvert::bytesToSShort($this->bytes, 12, $o), -1);
$this->assertEqual(PelConvert::bytesToSShort($this->bytes, 13, $o), -1);
$this->assertEqual(PelConvert::bytesToSShort($this->bytes, 14, $o), -1);
}
