fun Input.peekTo(destination: IoBuffer, offset: Int = 0, min: Int = 1, max: Int = Int.MAX_VALUE): Int
fun Input.peekTo(destination: Buffer, offset: Int = 0, min: Int = 1, max: Int = Int.MAX_VALUE): Int

Copy at least min but up to max bytes to the specified destination buffer from this input skipping offset bytes. If there are not enough bytes available to provide min bytes then it simply return number of available bytes with no exception so the returned value need to be checked. It is safe to specify max > destination.writeRemaining but min shouldn't be bigger than the destination free space. This function could trigger the underlying source reading that may lead to blocking I/O. It is safe to specify too big offset so in this case this function will always return 0. This function usually copy more bytes than min (unless max = min) but it is not guaranteed. When 0 is returned with offset = 0 then it makes sense to check Input.endOfInput.


number of bytes copied to the destination possibly 0



to write bytes


to skip input


bytes to be copied, shouldn't be greater than the buffer free space. Could be 0.


bytes to be copied even if there are more bytes buffered, could be Int.MAX_VALUE.