wvlet.airframe.msgpack.io.ByteArrayBuffer.scala Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of airframe-msgpack_2.13 Show documentation
Show all versions of airframe-msgpack_2.13 Show documentation
Pure-Scala MessagePack library
/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package wvlet.airframe.msgpack.io
import wvlet.airframe.msgpack.spi._
object ByteArrayBuffer {
def newBuffer(size: Int): ByteArrayBuffer = apply(new Array[Byte](size))
def apply(a: Array[Byte]): ByteArrayBuffer = fromArray(a, 0, a.length)
def fromArray(a: Array[Byte], offset: Int, size: Int): ByteArrayBuffer = {
require(offset + size <= a.length, s"input array is smaller than offset:${offset} + size:${size}: ${a.length}")
new ByteArrayBuffer(a, offset, size)
}
val emptyReadBuffer = ByteArrayBuffer(Array.emptyByteArray)
val emptyWriteBuffer = ByteArrayBuffer(Array.emptyByteArray)
}
/**
*/
class ByteArrayBuffer(a: Array[Byte], offset: Int, size: Int) extends ByteArrayBufferBase(a, offset, size)
class InfiniteByteArrayBuffer extends ByteArrayBufferBase(new Array[Byte](10), 0, 10) {
override def ensureCapacity(position: Int, requestedLength: Int): Unit = {
if (!hasCapacity(position, requestedLength)) {
var newLength = a.length
while (newLength < position + requestedLength) {
newLength *= 2
}
val newArray = new Array[Byte](newLength)
Array.copy(a, 0, newArray, 0, position)
a = newArray
capacity = newLength
}
}
}
abstract class ByteArrayBufferBase(protected[this] var a: Array[Byte], offset: Int, protected var capacity: Int)
extends ReadBuffer
with WriteBuffer {
require(offset >= 0, s"baseOffset ${offset} < 0")
require(
offset + capacity <= a.length,
s"insufficient buffer size. baseOffset:${offset} + capacity:${capacity} <= array size:${a.length}"
)
def size: Int = capacity
def toByteArray(position: Int, arraySize: Int): Array[Byte] = {
require(arraySize >= 0)
require(
position + arraySize <= capacity,
s"Insufficient array length (${a.length}, offset:${offset}, size:${capacity}) for slice(${position}, ${arraySize})"
)
if (a.length == offset + position + arraySize) {
a
} else {
val newArray = new Array[Byte](arraySize)
Array.copy(a, offset + position, newArray, 0, arraySize)
newArray
}
}
override def slice(position: Int, newSize: Int): ReadBuffer = {
require(
position + newSize <= capacity,
s"Insufficient array length (${a.length}, offset:${offset}, size:${size}) for slice(${position}, ${newSize})"
)
new ByteArrayBuffer(a, offset + position, newSize)
}
def hasCapacity(position: Int, byteLength: Int): Boolean = {
position + byteLength <= capacity
}
def ensureCapacity(position: Int, requestedLength: Int): Unit = {
if (!hasCapacity(position, requestedLength)) {
throw new InsufficientBufferException(position, requestedLength)
}
}
override def readByte(position: Int): Byte = {
ensureCapacity(position, 1)
val pos = offset + position
a(pos)
}
override def readShort(position: Int): Short = {
ensureCapacity(position, 2)
val pos = offset + position
((a(pos) << 8) | (a(pos + 1) & 0xff)).toShort
}
override def readInt(position: Int): Int = {
ensureCapacity(position, 4)
val pos = offset + position
((a(pos).toInt << 24) |
((a(pos + 1) & 0xff) << 16) |
((a(pos + 2) & 0xff) << 8) |
(a(pos + 3) & 0xff))
}
override def readLong(position: Int): Long = {
ensureCapacity(position, 8)
val pos = offset + position
((a(pos).toLong << 56) |
((a(pos + 1).toLong & 0xff) << 48) |
((a(pos + 2).toLong & 0xff) << 40) |
((a(pos + 3).toLong & 0xff) << 32) |
((a(pos + 4).toLong & 0xff) << 24) |
((a(pos + 5).toLong & 0xff) << 16) |
((a(pos + 6).toLong & 0xff) << 8) |
(a(pos + 7).toLong & 0xff))
}
override def readBytes(position: Int, length: Int): Array[Byte] = {
ensureCapacity(position, length)
val dest = new Array[Byte](length)
Array.copy(a, offset + position, dest, 0, length)
dest
}
override def readBytes(position: Int, length: Int, dest: Array[Byte], destOffset: Int): Unit = {
ensureCapacity(position, length)
Array.copy(a, offset + position, dest, destOffset, length)
}
override def readBytes(position: Int, length: Int, dest: WriteBuffer, destIndex: Int): Unit = {
ensureCapacity(position, length)
dest.writeBytes(destIndex, a, offset + position, length)
}
def writeByte(position: Int, v: Byte): Int = {
ensureCapacity(position, 1)
val pos = offset + position
a(pos) = v
1
}
def writeBytes(position: Int, source: Array[Byte], sourceOffset: Int, length: Int): Int = {
require(source != null, "source is null")
require(
sourceOffset + length <= source.length,
s"Insufficient input buffer size ${source.length} for reading ${sourceOffset}+${length} bytes"
)
ensureCapacity(position, length)
Array.copy(source, sourceOffset, a, offset + position, length)
length
}
override def writeBytes(position: Int, src: ReadBuffer, srcPosition: Int, length: Int): Int = {
require(src != null, "source is nul")
ensureCapacity(position, length)
src.readBytes(srcPosition, length, a, offset + position)
length
}
def writeShort(position: Int, v: Short): Int = {
ensureCapacity(position, 2)
val pos = offset + position
// Use big-endian order
a(pos) = ((v & 0xff00) >> 8).toByte
a(pos + 1) = (v & 0xff).toByte
2
}
def writeInt(position: Int, v: Int): Int = {
ensureCapacity(position, 4)
val pos = offset + position
// Use big-endian order
a(pos) = ((v & 0xff000000) >> 24).toByte
a(pos + 1) = ((v & 0xff0000) >> 16).toByte
a(pos + 2) = ((v & 0xff00) >> 8).toByte
a(pos + 3) = (v & 0xff).toByte
4
}
def writeLong(position: Int, v: Long): Int = {
ensureCapacity(position, 8)
val pos = offset + position
// Use big-endian order
a(pos) = ((v & 0xff00000000000000L) >> 56).toByte
a(pos + 1) = ((v & 0xff000000000000L) >> 48).toByte
a(pos + 2) = ((v & 0xff0000000000L) >> 40).toByte
a(pos + 3) = ((v & 0xff00000000L) >> 32).toByte
a(pos + 4) = ((v & 0xff000000L) >> 24).toByte
a(pos + 5) = ((v & 0xff0000L) >> 16).toByte
a(pos + 6) = ((v & 0xff00L) >> 8).toByte
a(pos + 7) = (v & 0xffL).toByte
8
}
}