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package java.io
class ByteArrayInputStream(
protected val buf: Array[Byte],
offset: Int, length: Int) extends InputStream {
protected val count: Int = offset + length
protected var mark: Int = offset
protected var pos: Int = offset
def this(buf: Array[Byte]) = this(buf, 0, buf.length)
override def read(): Int = {
if (pos >= count)
-1
else {
val res = buf(pos) & 0xFF // convert to unsigned int
pos += 1
res
}
}
override def read(b: Array[Byte], off: Int, reqLen: Int): Int = {
if (off < 0 || reqLen < 0 || reqLen > b.length - off)
throw new IndexOutOfBoundsException
val len = Math.min(reqLen, count - pos)
if (reqLen == 0)
0 // 0 requested, 0 returned
else if (len == 0)
-1 // nothing to read at all
else {
System.arraycopy(buf, pos, b, off, len)
pos += len
len
}
}
override def skip(n: Long): Long = {
val k = Math.max(0, Math.min(n, count - pos))
pos += k.toInt
k.toLong
}
override def available(): Int = count - pos
override def markSupported(): Boolean = true
override def mark(readlimit: Int): Unit =
mark = pos
override def reset(): Unit =
pos = mark
override def close(): Unit = ()
}
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