readIntLe
Reads a 32-bit signed integer in little-endian order starting at offset.
Little-endian means the least significant byte is stored at the lowest index: the byte at offset contributes bits 0..7 and the byte at offset + 3 contributes bits 24..31.
Return
the decoded value.
Parameters
offset
the index of the first byte to read.
Throws
if offset is negative or offset + 4 exceeds the array size.