/// <summary>
/// Reads the length of a field at the specified offset in the file
/// </summary>
/// <param name="offset">Offset into the file to read the field length from</param>
/// <returns>A LengthResult</returns>
internal LengthResult ReadLength(long offset)
{
// read in length information
int lengthValue;
int lengthLength = fileStream.ReadData(buffer, 1, offset);
if (buffer[0] != 0xFF)
{
// one byte is enough
lengthValue = Convert.ToInt32(buffer[0]);
}
else
{
// read in next 4 bytes
lengthLength += fileStream.ReadData(buffer, 4);
// reconstruct the length
lengthValue = BitConverter.ToInt32(buffer, 0);
}
return(new LengthResult {
LengthLength = lengthLength, ValueLength = lengthValue
});
}