Reads up to len bytes from the stream, and stores them into b starting at index off. The number of bytes read is returned. If no bytes can be read because the end of the stream has been reached, -1 is returned.

The bit offset within the stream is reset to zero before the read occurs.

Parameters:

b     an array of bytes to be written to.

off     the starting position within b to write to.

len     the maximum number of bytes to read.

Returns: the number of bytes actually read, or -1 to indicate EOF.

Exceptions:

NullPointerException     if b is null.

IndexOutOfBoundsException     if off is negative, len is negative, or off + len is greater than b.length.

IOException     if an I/O error occurs.

`b`		an array of bytes to be written to.
`off`		the starting position within `b` to write to.
`len`		the maximum number of `byte`s to read.

`NullPointerException`		if `b` is `null`.
`IndexOutOfBoundsException`		if `off` is negative, `len` is negative, or `off + len` is greater than `b.length`.
`IOException`		if an I/O error occurs.