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/*
* Copyright (C) 2009-2020 Lightbend Inc.
*/
package akka.util
import java.io.{ ObjectInputStream, ObjectOutputStream }
import java.lang.{ Iterable => JIterable }
import java.nio.{ ByteBuffer, ByteOrder }
import java.nio.charset.{ Charset, StandardCharsets }
import java.util.Base64
import scala.annotation.{ tailrec, varargs }
import scala.collection.IndexedSeqOptimized
import scala.collection.generic.CanBuildFrom
import scala.collection.immutable
import scala.collection.immutable.{ IndexedSeq, VectorBuilder }
import scala.collection.mutable.{ Builder, WrappedArray }
import scala.reflect.ClassTag
object ByteString {
/**
* Creates a new ByteString by copying a byte array.
*/
def apply(bytes: Array[Byte]): ByteString = CompactByteString(bytes)
/**
* Creates a new ByteString by copying bytes.
*/
def apply(bytes: Byte*): ByteString = CompactByteString(bytes: _*)
/**
* Creates a new ByteString by converting from integral numbers to bytes.
*/
def apply[T](bytes: T*)(implicit num: Integral[T]): ByteString =
CompactByteString(bytes: _*)(num)
/**
* Creates a new ByteString by copying bytes from a ByteBuffer.
*/
def apply(bytes: ByteBuffer): ByteString = CompactByteString(bytes)
/**
* Creates a new ByteString by encoding a String as UTF-8.
*/
def apply(string: String): ByteString = apply(string, StandardCharsets.UTF_8)
/**
* Creates a new ByteString by encoding a String with a charset.
*/
def apply(string: String, charset: String): ByteString = CompactByteString(string, charset)
/**
* Creates a new ByteString by encoding a String with a charset.
*/
def apply(string: String, charset: Charset): ByteString = CompactByteString(string, charset)
/**
* Creates a new ByteString by copying a byte array.
*/
def fromArray(array: Array[Byte]): ByteString = apply(array)
/**
* Unsafe API: Use only in situations you are completely confident that this is what
* you need, and that you understand the implications documented below.
*
* Creates a ByteString without copying the passed in byte array, unlike other factory
* methods defined on ByteString. This method of creating a ByteString saves one array
* copy and allocation and therefore can lead to better performance, however it also means
* that one MUST NOT modify the passed in array, or unexpected immutable data structure
* contract-breaking behavior will manifest itself.
*
* This API is intended for users who have obtained an byte array from some other API, and
* want wrap it into an ByteArray, and from there on only use that reference (the ByteString)
* to operate on the wrapped data. For all other intents and purposes, please use the usual
* apply and create methods - which provide the immutability guarantees by copying the array.
*
*/
def fromArrayUnsafe(array: Array[Byte]): ByteString = ByteString1C(array)
/**
* Creates a new ByteString by copying length bytes starting at offset from
* an Array.
*/
def fromArray(array: Array[Byte], offset: Int, length: Int): ByteString =
CompactByteString.fromArray(array, offset, length)
/**
* Unsafe API: Use only in situations you are completely confident that this is what
* you need, and that you understand the implications documented below.
*
* Creates a ByteString without copying the passed in byte array, unlike other factory
* methods defined on ByteString. This method of creating a ByteString saves one array
* copy and allocation and therefore can lead to better performance, however it also means
* that one MUST NOT modify the passed in array, or unexpected immutable data structure
* contract-breaking behavior will manifest itself.
*
* This API is intended for users who have obtained an byte array from some other API, and
* want wrap it into an ByteArray, and from there on only use that reference (the ByteString)
* to operate on the wrapped data. For all other intents and purposes, please use the usual
* apply and create methods - which provide the immutability guarantees by copying the array.
*
*/
def fromArrayUnsafe(array: Array[Byte], offset: Int, length: Int): ByteString = ByteString1(array, offset, length)
/**
* JAVA API
* Creates a new ByteString by copying an int array by converting from integral numbers to bytes.
*/
@varargs
def fromInts(array: Int*): ByteString =
apply(array: _*)(scala.math.Numeric.IntIsIntegral)
/**
* Creates a new ByteString which will contain the UTF-8 representation of the given String
*/
def fromString(string: String): ByteString = apply(string)
/**
* Creates a new ByteString which will contain the representation of the given String in the given charset
*/
def fromString(string: String, charset: String): ByteString = apply(string, charset)
/**
* Creates a new ByteString which will contain the representation of the given String in the given charset
*/
def fromString(string: String, charset: Charset): ByteString = apply(string, charset)
/**
* Standard "UTF-8" charset
*/
val UTF_8: String = StandardCharsets.UTF_8.name()
/**
* Creates a new ByteString by copying bytes out of a ByteBuffer.
*/
def fromByteBuffer(buffer: ByteBuffer): ByteString = apply(buffer)
val empty: ByteString = CompactByteString(Array.empty[Byte])
/** Java API */
val emptyByteString: ByteString = empty
def newBuilder: ByteStringBuilder = new ByteStringBuilder
/** Java API */
def createBuilder: ByteStringBuilder = new ByteStringBuilder
implicit val canBuildFrom: CanBuildFrom[TraversableOnce[Byte], Byte, ByteString] =
new CanBuildFrom[TraversableOnce[Byte], Byte, ByteString] {
def apply(ignore: TraversableOnce[Byte]): ByteStringBuilder = newBuilder
def apply(): ByteStringBuilder = newBuilder
}
private[akka] object ByteString1C extends Companion {
def fromString(s: String): ByteString1C = new ByteString1C(s.getBytes)
def apply(bytes: Array[Byte]): ByteString1C = new ByteString1C(bytes)
val SerializationIdentity = 1.toByte
def readFromInputStream(is: ObjectInputStream): ByteString1C = {
val length = is.readInt()
val arr = new Array[Byte](length)
is.readFully(arr, 0, length)
ByteString1C(arr)
}
}
/**
* A compact (unsliced) and unfragmented ByteString, implementation of ByteString1C.
*/
@SerialVersionUID(3956956327691936932L)
final class ByteString1C private (private val bytes: Array[Byte]) extends CompactByteString {
def apply(idx: Int): Byte = bytes(idx)
override def length: Int = bytes.length
// Avoid `iterator` in performance sensitive code, call ops directly on ByteString instead
override def iterator: ByteIterator.ByteArrayIterator = ByteIterator.ByteArrayIterator(bytes, 0, bytes.length)
/** INTERNAL API */
private[akka] def toByteString1: ByteString1 = ByteString1(bytes, 0, bytes.length)
/** INTERNAL API */
private[akka] def byteStringCompanion = ByteString1C
override def asByteBuffer: ByteBuffer = toByteString1.asByteBuffer
override def asByteBuffers: scala.collection.immutable.Iterable[ByteBuffer] = List(asByteBuffer)
override def decodeString(charset: String): String =
if (isEmpty) "" else new String(bytes, charset)
override def decodeString(charset: Charset): String =
if (isEmpty) "" else new String(bytes, charset)
override def decodeBase64: ByteString =
if (isEmpty) this else ByteString1C(Base64.getDecoder.decode(bytes))
override def encodeBase64: ByteString =
if (isEmpty) this else ByteString1C(Base64.getEncoder.encode(bytes))
override def ++(that: ByteString): ByteString = {
if (that.isEmpty) this
else if (this.isEmpty) that
else toByteString1 ++ that
}
override def take(n: Int): ByteString =
if (n <= 0) ByteString.empty
else if (n >= length) this
else toByteString1.take(n)
override def dropRight(n: Int): ByteString =
if (n <= 0) this
else toByteString1.dropRight(n)
override def drop(n: Int): ByteString =
if (n <= 0) this
else toByteString1.drop(n)
override def indexOf[B >: Byte](elem: B): Int = indexOf(elem, 0)
override def indexOf[B >: Byte](elem: B, from: Int): Int = {
if (from >= length) -1
else {
var found = -1
var i = math.max(from, 0)
while (i < length && found == -1) {
if (bytes(i) == elem) found = i
i += 1
}
found
}
}
override def slice(from: Int, until: Int): ByteString =
if (from <= 0 && until >= length) this
else if (from >= length || until <= 0 || from >= until) ByteString.empty
else toByteString1.slice(from, until)
private[akka] override def writeToOutputStream(os: ObjectOutputStream): Unit =
toByteString1.writeToOutputStream(os)
override def copyToBuffer(buffer: ByteBuffer): Int =
writeToBuffer(buffer, offset = 0)
/** INTERNAL API: Specialized for internal use, writing multiple ByteString1C into the same ByteBuffer. */
private[akka] def writeToBuffer(buffer: ByteBuffer, offset: Int): Int = {
val copyLength = Math.min(buffer.remaining, offset + length)
if (copyLength > 0) {
buffer.put(bytes, offset, copyLength)
}
copyLength
}
/** INTERNAL API: Specialized for internal use, appending ByteString1C to a ByteStringBuilder. */
private[akka] def appendToBuilder(buffer: ByteStringBuilder) = {
buffer.putByteArrayUnsafe(bytes)
}
}
/** INTERNAL API: ByteString backed by exactly one array, with start / end markers */
private[akka] object ByteString1 extends Companion {
val empty: ByteString1 = new ByteString1(Array.empty[Byte])
def fromString(s: String): ByteString1 = apply(s.getBytes)
def apply(bytes: Array[Byte]): ByteString1 = apply(bytes, 0, bytes.length)
def apply(bytes: Array[Byte], startIndex: Int, length: Int): ByteString1 =
if (length == 0) empty
else new ByteString1(bytes, Math.max(0, startIndex), Math.max(0, length))
val SerializationIdentity = 0.toByte
def readFromInputStream(is: ObjectInputStream): ByteString1 =
ByteString1C.readFromInputStream(is).toByteString1
}
/**
* An unfragmented ByteString.
*/
final class ByteString1 private (private val bytes: Array[Byte], private val startIndex: Int, val length: Int)
extends ByteString
with Serializable {
private def this(bytes: Array[Byte]) = this(bytes, 0, bytes.length)
def apply(idx: Int): Byte = bytes(checkRangeConvert(idx))
// Avoid `iterator` in performance sensitive code, call ops directly on ByteString instead
override def iterator: ByteIterator.ByteArrayIterator =
ByteIterator.ByteArrayIterator(bytes, startIndex, startIndex + length)
private def checkRangeConvert(index: Int): Int = {
if (0 <= index && length > index)
index + startIndex
else
throw new IndexOutOfBoundsException(index.toString)
}
private[akka] def writeToOutputStream(os: ObjectOutputStream): Unit = {
os.writeInt(length)
os.write(bytes, startIndex, length)
}
def isCompact: Boolean = (length == bytes.length)
private[akka] def byteStringCompanion = ByteString1
override def dropRight(n: Int): ByteString =
dropRight1(n)
/** INTERNAL API */
private[akka] def dropRight1(n: Int): ByteString1 =
if (n <= 0) this
else if (length - n <= 0) ByteString1.empty
else new ByteString1(bytes, startIndex, length - n)
override def drop(n: Int): ByteString =
if (n <= 0) this else drop1(n)
/** INTERNAL API */
private[akka] def drop1(n: Int): ByteString1 = {
val nextStartIndex = startIndex + n
if (nextStartIndex >= bytes.length) ByteString1.empty
else ByteString1(bytes, nextStartIndex, length - n)
}
override def take(n: Int): ByteString =
if (n <= 0) ByteString.empty else take1(n)
private[akka] def take1(n: Int): ByteString1 =
if (n >= length) this
else ByteString1(bytes, startIndex, n)
override def slice(from: Int, until: Int): ByteString =
drop(from).take(until - Math.max(0, from))
override def copyToBuffer(buffer: ByteBuffer): Int =
writeToBuffer(buffer)
/** INTERNAL API: Specialized for internal use, writing multiple ByteString1C into the same ByteBuffer. */
private[akka] def writeToBuffer(buffer: ByteBuffer): Int = {
val copyLength = Math.min(buffer.remaining, length)
if (copyLength > 0) {
buffer.put(bytes, startIndex, copyLength)
}
copyLength
}
def compact: CompactByteString =
if (isCompact) ByteString1C(bytes) else ByteString1C(toArray)
def asByteBuffer: ByteBuffer = {
val buffer = ByteBuffer.wrap(bytes, startIndex, length).asReadOnlyBuffer
if (buffer.remaining < bytes.length) buffer.slice
else buffer
}
def asByteBuffers: scala.collection.immutable.Iterable[ByteBuffer] = List(asByteBuffer)
override def decodeString(charset: String): String =
if (isEmpty) ""
else new String(bytes, startIndex, length, charset)
override def decodeString(charset: Charset): String = // avoids Charset.forName lookup in String internals
if (isEmpty) ""
else new String(bytes, startIndex, length, charset)
override def decodeBase64: ByteString =
if (isEmpty) this
else if (isCompact) ByteString1C(Base64.getDecoder.decode(bytes))
else {
val dst = Base64.getDecoder.decode(ByteBuffer.wrap(bytes, startIndex, length))
if (dst.hasArray) {
if (dst.array.length == dst.remaining) ByteString1C(dst.array)
else ByteString1(dst.array, dst.arrayOffset + dst.position(), dst.remaining)
} else CompactByteString(dst)
}
override def encodeBase64: ByteString =
if (isEmpty) this
else if (isCompact) ByteString1C(Base64.getEncoder.encode(bytes))
else {
val dst = Base64.getEncoder.encode(ByteBuffer.wrap(bytes, startIndex, length))
if (dst.hasArray) {
if (dst.array.length == dst.remaining) ByteString1C(dst.array)
else ByteString1(dst.array, dst.arrayOffset + dst.position(), dst.remaining)
} else CompactByteString(dst)
}
def ++(that: ByteString): ByteString = {
if (that.isEmpty) this
else if (this.isEmpty) that
else
that match {
case b: ByteString1C => ByteStrings(this, b.toByteString1)
case b: ByteString1 =>
if ((bytes eq b.bytes) && (startIndex + length == b.startIndex))
new ByteString1(bytes, startIndex, length + b.length)
else ByteStrings(this, b)
case bs: ByteStrings => ByteStrings(this, bs)
}
}
override def indexOf[B >: Byte](elem: B): Int = indexOf(elem, 0)
override def indexOf[B >: Byte](elem: B, from: Int): Int = {
if (from >= length) -1
else {
var found = -1
var i = math.max(from, 0)
while (i < length && found == -1) {
if (bytes(startIndex + i) == elem) found = i
i += 1
}
found
}
}
protected def writeReplace(): AnyRef = new SerializationProxy(this)
}
private[akka] object ByteStrings extends Companion {
def apply(bytestrings: Vector[ByteString1]): ByteString =
new ByteStrings(bytestrings, bytestrings.foldLeft(0)(_ + _.length))
def apply(bytestrings: Vector[ByteString1], length: Int): ByteString = new ByteStrings(bytestrings, length)
def apply(b1: ByteString1, b2: ByteString1): ByteString = compare(b1, b2) match {
case 3 => new ByteStrings(Vector(b1, b2), b1.length + b2.length)
case 2 => b2
case 1 => b1
case 0 => ByteString.empty
}
def apply(b: ByteString1, bs: ByteStrings): ByteString = compare(b, bs) match {
case 3 => new ByteStrings(b +: bs.bytestrings, bs.length + b.length)
case 2 => bs
case 1 => b
case 0 => ByteString.empty
}
def apply(bs: ByteStrings, b: ByteString1): ByteString = compare(bs, b) match {
case 3 => new ByteStrings(bs.bytestrings :+ b, bs.length + b.length)
case 2 => b
case 1 => bs
case 0 => ByteString.empty
}
def apply(bs1: ByteStrings, bs2: ByteStrings): ByteString = compare(bs1, bs2) match {
case 3 => new ByteStrings(bs1.bytestrings ++ bs2.bytestrings, bs1.length + bs2.length)
case 2 => bs2
case 1 => bs1
case 0 => ByteString.empty
}
// 0: both empty, 1: 2nd empty, 2: 1st empty, 3: neither empty
def compare(b1: ByteString, b2: ByteString): Int =
if (b1.isEmpty)
if (b2.isEmpty) 0 else 2
else if (b2.isEmpty) 1
else 3
val SerializationIdentity = 2.toByte
def readFromInputStream(is: ObjectInputStream): ByteStrings = {
val nByteStrings = is.readInt()
val builder = new VectorBuilder[ByteString1]
var length = 0
builder.sizeHint(nByteStrings)
for (_ <- 0 until nByteStrings) {
val bs = ByteString1.readFromInputStream(is)
builder += bs
length += bs.length
}
new ByteStrings(builder.result(), length)
}
}
/**
* A ByteString with 2 or more fragments.
*/
final class ByteStrings private (private[akka] val bytestrings: Vector[ByteString1], val length: Int)
extends ByteString
with Serializable {
if (bytestrings.isEmpty) throw new IllegalArgumentException("bytestrings must not be empty")
if (bytestrings.head.isEmpty) throw new IllegalArgumentException("bytestrings.head must not be empty")
def apply(idx: Int): Byte = {
if (0 <= idx && idx < length) {
var pos = 0
var seen = 0
while (idx >= seen + bytestrings(pos).length) {
seen += bytestrings(pos).length
pos += 1
}
bytestrings(pos)(idx - seen)
} else throw new IndexOutOfBoundsException(idx.toString)
}
/** Avoid `iterator` in performance sensitive code, call ops directly on ByteString instead */
override def iterator: ByteIterator.MultiByteArrayIterator =
ByteIterator.MultiByteArrayIterator(bytestrings.toStream.map { _.iterator })
def ++(that: ByteString): ByteString = {
if (that.isEmpty) this
else if (this.isEmpty) that
else
that match {
case b: ByteString1C => ByteStrings(this, b.toByteString1)
case b: ByteString1 => ByteStrings(this, b)
case bs: ByteStrings => ByteStrings(this, bs)
}
}
private[akka] def byteStringCompanion = ByteStrings
def isCompact: Boolean = if (bytestrings.length == 1) bytestrings.head.isCompact else false
override def copyToBuffer(buffer: ByteBuffer): Int = {
@tailrec def copyItToTheBuffer(buffer: ByteBuffer, i: Int, written: Int): Int =
if (i < bytestrings.length) copyItToTheBuffer(buffer, i + 1, written + bytestrings(i).writeToBuffer(buffer))
else written
copyItToTheBuffer(buffer, 0, 0)
}
def compact: CompactByteString = {
if (isCompact) bytestrings.head.compact
else {
val ar = new Array[Byte](length)
var pos = 0
bytestrings.foreach { b =>
b.copyToArray(ar, pos, b.length)
pos += b.length
}
ByteString1C(ar)
}
}
def asByteBuffer: ByteBuffer = compact.asByteBuffer
def asByteBuffers: scala.collection.immutable.Iterable[ByteBuffer] = bytestrings.map { _.asByteBuffer }
def decodeString(charset: String): String = compact.decodeString(charset)
def decodeString(charset: Charset): String = compact.decodeString(charset)
override def decodeBase64: ByteString = compact.decodeBase64
override def encodeBase64: ByteString = compact.encodeBase64
private[akka] def writeToOutputStream(os: ObjectOutputStream): Unit = {
os.writeInt(bytestrings.length)
bytestrings.foreach(_.writeToOutputStream(os))
}
override def take(n: Int): ByteString =
if (n <= 0) ByteString.empty
else if (n >= length) this
else take0(n)
private[akka] def take0(n: Int): ByteString = {
@tailrec def go(last: Int, restToTake: Int): (Int, Int) = {
val bs = bytestrings(last)
if (bs.length > restToTake) (last, restToTake)
else go(last + 1, restToTake - bs.length)
}
val (last, restToTake) = go(0, n)
if (last == 0) bytestrings(last).take(restToTake)
else if (restToTake == 0) new ByteStrings(bytestrings.take(last), n)
else new ByteStrings(bytestrings.take(last) :+ bytestrings(last).take1(restToTake), n)
}
override def dropRight(n: Int): ByteString =
if (0 < n && n < length) dropRight0(n)
else if (n >= length) ByteString.empty
else this
private def dropRight0(n: Int): ByteString = {
val byteStringsSize = bytestrings.length
@tailrec def dropRightWithFullDropsAndRemainig(fullDrops: Int, remainingToDrop: Int): ByteString = {
val bs = bytestrings(byteStringsSize - fullDrops - 1)
if (bs.length > remainingToDrop) {
if (fullDrops == byteStringsSize - 1)
bytestrings(0).dropRight(remainingToDrop)
else if (remainingToDrop == 0)
new ByteStrings(bytestrings.dropRight(fullDrops), length - n)
else
new ByteStrings(
bytestrings.dropRight(fullDrops + 1) :+ bytestrings(byteStringsSize - fullDrops - 1)
.dropRight1(remainingToDrop),
length - n)
} else {
dropRightWithFullDropsAndRemainig(fullDrops + 1, remainingToDrop - bs.length)
}
}
dropRightWithFullDropsAndRemainig(0, n)
}
override def slice(from: Int, until: Int): ByteString =
if (from <= 0 && until >= length) this
else if (from > length || until <= from) ByteString.empty
else drop(from).dropRight(length - until)
override def drop(n: Int): ByteString =
if (n <= 0) this
else if (n >= length) ByteString.empty
else drop0(n)
private def drop0(n: Int): ByteString = {
// impl note: could be optimised a bit by using VectorIterator instead,
// however then we're forced to call .toVector which halfs performance
// We can work around that, as there's a Scala private method "remainingVector" which is fast,
// but let's not go into calling private APIs here just yet.
@tailrec def findSplit(fullDrops: Int, remainingToDrop: Int): (Int, Int) = {
val bs = bytestrings(fullDrops)
if (bs.length > remainingToDrop) (fullDrops, remainingToDrop)
else findSplit(fullDrops + 1, remainingToDrop - bs.length)
}
val (fullDrops, remainingToDrop) = findSplit(0, n)
if (remainingToDrop == 0)
new ByteStrings(bytestrings.drop(fullDrops), length - n)
else if (fullDrops == bytestrings.length - 1)
bytestrings(fullDrops).drop(remainingToDrop)
else
new ByteStrings(bytestrings(fullDrops).drop1(remainingToDrop) +: bytestrings.drop(fullDrops + 1), length - n)
}
override def indexOf[B >: Byte](elem: B): Int = indexOf(elem, 0)
override def indexOf[B >: Byte](elem: B, from: Int): Int = {
if (from >= length) -1
else {
val byteStringsSize = bytestrings.size
@tailrec
def find(bsIdx: Int, relativeIndex: Int, bytesPassed: Int): Int = {
if (bsIdx >= byteStringsSize) -1
else {
val bs = bytestrings(bsIdx)
if (bs.length <= relativeIndex) {
find(bsIdx + 1, relativeIndex - bs.length, bytesPassed + bs.length)
} else {
val subIndexOf = bs.indexOf(elem, relativeIndex)
if (subIndexOf < 0) {
val nextString = bsIdx + 1
find(nextString, relativeIndex - bs.length, bytesPassed + bs.length)
} else subIndexOf + bytesPassed
}
}
}
find(0, math.max(from, 0), 0)
}
}
protected def writeReplace(): AnyRef = new SerializationProxy(this)
}
@SerialVersionUID(1L)
private class SerializationProxy(@transient private var orig: ByteString) extends Serializable {
private def writeObject(out: ObjectOutputStream): Unit = {
out.writeByte(orig.byteStringCompanion.SerializationIdentity)
orig.writeToOutputStream(out)
}
private def readObject(in: ObjectInputStream): Unit = {
val serializationId = in.readByte()
orig = Companion(from = serializationId).readFromInputStream(in)
}
private def readResolve(): AnyRef = orig
}
private[akka] object Companion {
private val companionMap = Seq(ByteString1, ByteString1C, ByteStrings)
.map(x => x.SerializationIdentity -> x)
.toMap
.withDefault(x => throw new IllegalArgumentException("Invalid serialization id " + x))
def apply(from: Byte): Companion = companionMap(from)
}
private[akka] sealed trait Companion {
def SerializationIdentity: Byte
def readFromInputStream(is: ObjectInputStream): ByteString
}
}
/**
* A rope-like immutable data structure containing bytes.
* The goal of this structure is to reduce copying of arrays
* when concatenating and slicing sequences of bytes,
* and also providing a thread safe way of working with bytes.
*
* TODO: Add performance characteristics
*/
sealed abstract class ByteString extends IndexedSeq[Byte] with IndexedSeqOptimized[Byte, ByteString] {
def apply(idx: Int): Byte
private[akka] def byteStringCompanion: ByteString.Companion
// override so that toString will also be `ByteString(...)` for the concrete subclasses
// of ByteString which changed for Scala 2.12, see https://github.com/akka/akka/issues/21774
override final def stringPrefix: String = "ByteString"
override protected[this] def newBuilder: ByteStringBuilder = ByteString.newBuilder
override def isEmpty: Boolean = length == 0
// *must* be overridden by derived classes. This construction is necessary
// to specialize the return type, as the method is already implemented in
// a parent trait.
//
// Avoid `iterator` in performance sensitive code, call ops directly on ByteString instead
override def iterator: ByteIterator =
throw new UnsupportedOperationException("Method iterator is not implemented in ByteString")
override def head: Byte = apply(0)
override def tail: ByteString = drop(1)
override def last: Byte = apply(length - 1)
override def init: ByteString = dropRight(1)
// *must* be overridden by derived classes.
override def take(n: Int): ByteString =
throw new UnsupportedOperationException("Method take is not implemented in ByteString")
override def takeRight(n: Int): ByteString = slice(length - n, length)
// these methods are optimized in derived classes utilising the maximum knowlage about data layout available to them:
// *must* be overridden by derived classes.
override def slice(from: Int, until: Int): ByteString =
throw new UnsupportedOperationException("Method slice is not implemented in ByteString")
// *must* be overridden by derived classes.
override def drop(n: Int): ByteString =
throw new UnsupportedOperationException("Method drop is not implemented in ByteString")
// *must* be overridden by derived classes.
override def dropRight(n: Int): ByteString =
throw new UnsupportedOperationException("Method dropRight is not implemented in ByteString")
override def takeWhile(p: Byte => Boolean): ByteString = iterator.takeWhile(p).toByteString
override def dropWhile(p: Byte => Boolean): ByteString = iterator.dropWhile(p).toByteString
override def span(p: Byte => Boolean): (ByteString, ByteString) = {
val (a, b) = iterator.span(p); (a.toByteString, b.toByteString)
}
override def splitAt(n: Int): (ByteString, ByteString) = (take(n), drop(n))
override def indexWhere(p: Byte => Boolean): Int = iterator.indexWhere(p)
// optimized in subclasses
override def indexOf[B >: Byte](elem: B): Int = indexOf(elem, 0)
override def grouped(size: Int): Iterator[ByteString] = {
if (size <= 0) {
throw new IllegalArgumentException(s"size=$size must be positive")
}
Iterator.iterate(this)(_.drop(size)).takeWhile(_.nonEmpty).map(_.take(size))
}
override def toString(): String = {
val maxSize = 100
if (size > maxSize)
take(maxSize).toString + s"... and [${size - maxSize}] more"
else
super.toString
}
/**
* Java API: copy this ByteString into a fresh byte array
*
* @return this ByteString copied into a byte array
*/
protected[ByteString] def toArray: Array[Byte] = toArray[Byte]
override def toArray[B >: Byte](implicit arg0: ClassTag[B]): Array[B] = iterator.toArray
override def copyToArray[B >: Byte](xs: Array[B], start: Int, len: Int): Unit =
iterator.copyToArray(xs, start, len)
override def foreach[@specialized U](f: Byte => U): Unit = iterator.foreach(f)
private[akka] def writeToOutputStream(os: ObjectOutputStream): Unit
/**
* Efficiently concatenate another ByteString.
*/
def ++(that: ByteString): ByteString
/**
* Java API: efficiently concatenate another ByteString.
*/
def concat(that: ByteString): ByteString = this ++ that
/**
* Copy as many bytes as possible to a ByteBuffer, starting from it's
* current position. This method will not overflow the buffer.
*
* @param buffer a ByteBuffer to copy bytes to
* @return the number of bytes actually copied
*/
// *must* be overridden by derived classes.
def copyToBuffer(buffer: ByteBuffer): Int =
throw new UnsupportedOperationException(
s"Method copyToBuffer is not implemented in ByteString, failed for buffer $buffer")
/**
* Create a new ByteString with all contents compacted into a single,
* full byte array.
* If isCompact returns true, compact is an O(1) operation, but
* might return a different object with an optimized implementation.
*/
def compact: CompactByteString
/**
* Check whether this ByteString is compact in memory.
* If the ByteString is compact, it might, however, not be represented
* by an object that takes full advantage of that fact. Use compact to
* get such an object.
*/
def isCompact: Boolean
/**
* Returns a read-only ByteBuffer that directly wraps this ByteString
* if it is not fragmented.
*/
def asByteBuffer: ByteBuffer
/**
* Scala API: Returns an immutable Iterable of read-only ByteBuffers that directly wraps this ByteStrings
* all fragments. Will always have at least one entry.
*/
def asByteBuffers: immutable.Iterable[ByteBuffer]
/**
* Java API: Returns an Iterable of read-only ByteBuffers that directly wraps this ByteStrings
* all fragments. Will always have at least one entry.
*/
def getByteBuffers(): JIterable[ByteBuffer] = {
import scala.collection.JavaConverters.asJavaIterableConverter
asByteBuffers.asJava
}
/**
* Creates a new ByteBuffer with a copy of all bytes contained in this
* ByteString.
*/
def toByteBuffer: ByteBuffer = ByteBuffer.wrap(toArray)
/**
* Decodes this ByteString as a UTF-8 encoded String.
*/
final def utf8String: String = decodeString(StandardCharsets.UTF_8)
/**
* Decodes this ByteString using a charset to produce a String.
* If you have a [[Charset]] instance available, use `decodeString(charset: java.nio.charset.Charset` instead.
*/
def decodeString(charset: String): String
/**
* Decodes this ByteString using a charset to produce a String.
* Avoids Charset.forName lookup in String internals, thus is preferable to `decodeString(charset: String)`.
*/
def decodeString(charset: Charset): String
/*
* Returns a ByteString which is the binary representation of this ByteString
* if this ByteString is Base64-encoded.
*/
def decodeBase64: ByteString
/**
* Returns a ByteString which is the Base64 representation of this ByteString
*/
def encodeBase64: ByteString
/**
* map method that will automatically cast Int back into Byte.
*/
final def mapI(f: Byte => Int): ByteString = map(f.andThen(_.toByte))
}
object CompactByteString {
/**
* Creates a new CompactByteString by copying a byte array.
*/
def apply(bytes: Array[Byte]): CompactByteString =
if (bytes.isEmpty) empty else ByteString.ByteString1C(bytes.clone)
/**
* Creates a new CompactByteString by copying bytes.
*/
def apply(bytes: Byte*): CompactByteString = {
if (bytes.isEmpty) empty
else {
val ar = new Array[Byte](bytes.size)
bytes.copyToArray(ar)
ByteString.ByteString1C(ar)
}
}
/**
* Creates a new CompactByteString by converting from integral numbers to bytes.
*/
def apply[T](bytes: T*)(implicit num: Integral[T]): CompactByteString = {
if (bytes.isEmpty) empty
else ByteString.ByteString1C(bytes.map(x => num.toInt(x).toByte)(collection.breakOut))
}
/**
* Creates a new CompactByteString by copying bytes from a ByteBuffer.
*/
def apply(bytes: ByteBuffer): CompactByteString = {
if (bytes.remaining < 1) empty
else {
val ar = new Array[Byte](bytes.remaining)
bytes.get(ar)
ByteString.ByteString1C(ar)
}
}
/**
* Creates a new CompactByteString by encoding a String as UTF-8.
*/
def apply(string: String): CompactByteString = apply(string, StandardCharsets.UTF_8)
/**
* Creates a new CompactByteString by encoding a String with a charset.
*/
def apply(string: String, charset: String): CompactByteString =
if (string.isEmpty) empty else ByteString.ByteString1C(string.getBytes(charset))
/**
* Creates a new CompactByteString by encoding a String with a charset.
*/
def apply(string: String, charset: Charset): CompactByteString =
if (string.isEmpty) empty else ByteString.ByteString1C(string.getBytes(charset))
/**
* Creates a new CompactByteString by copying length bytes starting at offset from
* an Array.
*/
def fromArray(array: Array[Byte], offset: Int, length: Int): CompactByteString = {
val copyOffset = Math.max(offset, 0)
val copyLength = Math.max(Math.min(array.length - copyOffset, length), 0)
if (copyLength == 0) empty
else {
val copyArray = new Array[Byte](copyLength)
Array.copy(array, copyOffset, copyArray, 0, copyLength)
ByteString.ByteString1C(copyArray)
}
}
val empty: CompactByteString = ByteString.ByteString1C(Array.empty[Byte])
}
/**
* A compact ByteString.
*
* The ByteString is guarantied to be contiguous in memory and to use only
* as much memory as required for its contents.
*/
sealed abstract class CompactByteString extends ByteString with Serializable {
def isCompact: Boolean = true
def compact: this.type = this
}
/**
* A mutable builder for efficiently creating a [[akka.util.ByteString]].
*
* The created ByteString is not automatically compacted.
*/
final class ByteStringBuilder extends Builder[Byte, ByteString] {
builder =>
import ByteString.{ ByteString1, ByteString1C, ByteStrings }
private var _length: Int = 0
private val _builder: VectorBuilder[ByteString1] = new VectorBuilder[ByteString1]()
private var _temp: Array[Byte] = _
private var _tempLength: Int = 0
private var _tempCapacity: Int = 0
protected def fillArray(len: Int)(fill: (Array[Byte], Int) => Unit): this.type = {
ensureTempSize(_tempLength + len)
fill(_temp, _tempLength)
_tempLength += len
_length += len
this
}
@inline protected final def fillByteBuffer(len: Int, byteOrder: ByteOrder)(fill: ByteBuffer => Unit): this.type = {
fillArray(len) {
case (array, start) =>
val buffer = ByteBuffer.wrap(array, start, len)
buffer.order(byteOrder)
fill(buffer)
}
}
def length: Int = _length
override def sizeHint(len: Int): Unit = {
resizeTemp(len - (_length - _tempLength))
}
private def clearTemp(): Unit = {
if (_tempLength > 0) {
val arr = new Array[Byte](_tempLength)
Array.copy(_temp, 0, arr, 0, _tempLength)
_builder += ByteString1(arr)
_tempLength = 0
}
}
private def resizeTemp(size: Int): Unit = {
val newtemp = new Array[Byte](size)
if (_tempLength > 0) Array.copy(_temp, 0, newtemp, 0, _tempLength)
_temp = newtemp
_tempCapacity = _temp.length
}
@inline private def shouldResizeTempFor(size: Int): Boolean = _tempCapacity < size || _tempCapacity == 0
private def ensureTempSize(size: Int): Unit = {
if (shouldResizeTempFor(size)) {
var newSize = if (_tempCapacity == 0) 16 else _tempCapacity * 2
while (newSize < size) newSize *= 2
resizeTemp(newSize)
}
}
def +=(elem: Byte): this.type = {
ensureTempSize(_tempLength + 1)
_temp(_tempLength) = elem
_tempLength += 1
_length += 1
this
}
def ++=(bytes: ByteString): this.type = {
if (bytes.nonEmpty) {
clearTemp()
bytes match {
case b: ByteString1C =>
_builder += b.toByteString1
_length += b.length
case b: ByteString1 =>
_builder += b
_length += b.length
case bs: ByteStrings =>
_builder ++= bs.bytestrings
_length += bs.length
}
}
this
}
override def ++=(xs: TraversableOnce[Byte]): this.type = {
xs match {
case bs: ByteString => ++=(bs)
case xs: WrappedArray.ofByte =>
if (xs.nonEmpty) putByteArrayUnsafe(xs.array.clone)
case seq: collection.IndexedSeq[Byte] if shouldResizeTempFor(seq.length) =>
if (seq.nonEmpty) {
val copied = new Array[Byte](seq.length)
seq.copyToArray(copied)
clearTemp()
_builder += ByteString.ByteString1(copied)
_length += seq.length
}
case seq: collection.IndexedSeq[_] =>
if (seq.nonEmpty) {
ensureTempSize(_tempLength + xs.size)
xs.copyToArray(_temp, _tempLength)
_tempLength += seq.length
_length += seq.length
}
case _ =>
super.++=(xs)
}
this
}
private[akka] def putByteArrayUnsafe(xs: Array[Byte]): this.type = {
clearTemp()
_builder += ByteString1(xs)
_length += xs.length
this
}
/**
* Java API: append a ByteString to this builder.
*/
def append(bs: ByteString): this.type = if (bs.isEmpty) this else this ++= bs
/**
* Add a single Byte to this builder.
*/
def putByte(x: Byte): this.type = this += x
/**
* Add a single Short to this builder.
*/
def putShort(x: Int)(implicit byteOrder: ByteOrder): this.type = {
if (byteOrder == ByteOrder.BIG_ENDIAN) {
this += (x >>> 8).toByte
this += (x >>> 0).toByte
} else if (byteOrder == ByteOrder.LITTLE_ENDIAN) {
this += (x >>> 0).toByte
this += (x >>> 8).toByte
} else throw new IllegalArgumentException("Unknown byte order " + byteOrder)
}
/**
* Add a single Int to this builder.
*/
def putInt(x: Int)(implicit byteOrder: ByteOrder): this.type = {
fillArray(4) { (target, offset) =>
if (byteOrder == ByteOrder.BIG_ENDIAN) {
target(offset + 0) = (x >>> 24).toByte
target(offset + 1) = (x >>> 16).toByte
target(offset + 2) = (x >>> 8).toByte
target(offset + 3) = (x >>> 0).toByte
} else if (byteOrder == ByteOrder.LITTLE_ENDIAN) {
target(offset + 0) = (x >>> 0).toByte
target(offset + 1) = (x >>> 8).toByte
target(offset + 2) = (x >>> 16).toByte
target(offset + 3) = (x >>> 24).toByte
} else throw new IllegalArgumentException("Unknown byte order " + byteOrder)
}
this
}
/**
* Add a single Long to this builder.
*/
def putLong(x: Long)(implicit byteOrder: ByteOrder): this.type = {
fillArray(8) { (target, offset) =>
if (byteOrder == ByteOrder.BIG_ENDIAN) {
target(offset + 0) = (x >>> 56).toByte
target(offset + 1) = (x >>> 48).toByte
target(offset + 2) = (x >>> 40).toByte
target(offset + 3) = (x >>> 32).toByte
target(offset + 4) = (x >>> 24).toByte
target(offset + 5) = (x >>> 16).toByte
target(offset + 6) = (x >>> 8).toByte
target(offset + 7) = (x >>> 0).toByte
} else if (byteOrder == ByteOrder.LITTLE_ENDIAN) {
target(offset + 0) = (x >>> 0).toByte
target(offset + 1) = (x >>> 8).toByte
target(offset + 2) = (x >>> 16).toByte
target(offset + 3) = (x >>> 24).toByte
target(offset + 4) = (x >>> 32).toByte
target(offset + 5) = (x >>> 40).toByte
target(offset + 6) = (x >>> 48).toByte
target(offset + 7) = (x >>> 56).toByte
} else throw new IllegalArgumentException("Unknown byte order " + byteOrder)
}
this
}
/**
* Add the `n` least significant bytes of the given Long to this builder.
*/
def putLongPart(x: Long, n: Int)(implicit byteOrder: ByteOrder): this.type = {
fillArray(n) { (target, offset) =>
if (byteOrder == ByteOrder.BIG_ENDIAN) {
val start = n * 8 - 8
(0 until n).foreach { i =>
target(offset + i) = (x >>> start - 8 * i).toByte
}
} else if (byteOrder == ByteOrder.LITTLE_ENDIAN) {
(0 until n).foreach { i =>
target(offset + i) = (x >>> 8 * i).toByte
}
} else throw new IllegalArgumentException("Unknown byte order " + byteOrder)
}
}
/**
* Add a single Float to this builder.
*/
def putFloat(x: Float)(implicit byteOrder: ByteOrder): this.type =
putInt(java.lang.Float.floatToRawIntBits(x))(byteOrder)
/**
* Add a single Double to this builder.
*/
def putDouble(x: Double)(implicit byteOrder: ByteOrder): this.type =
putLong(java.lang.Double.doubleToRawLongBits(x))(byteOrder)
/**
* Add a number of Bytes from an array to this builder.
*/
def putBytes(array: Array[Byte]): this.type =
putBytes(array, 0, array.length)
/**
* Add a number of Bytes from an array to this builder.
*/
def putBytes(array: Array[Byte], start: Int, len: Int): this.type =
fillArray(len) { case (target, targetOffset) => Array.copy(array, start, target, targetOffset, len) }
/**
* Add a number of Shorts from an array to this builder.
*/
def putShorts(array: Array[Short])(implicit byteOrder: ByteOrder): this.type =
putShorts(array, 0, array.length)(byteOrder)
/**
* Add a number of Shorts from an array to this builder.
*/
def putShorts(array: Array[Short], start: Int, len: Int)(implicit byteOrder: ByteOrder): this.type =
fillByteBuffer(len * 2, byteOrder) { _.asShortBuffer.put(array, start, len) }
/**
* Add a number of Ints from an array to this builder.
*/
def putInts(array: Array[Int])(implicit byteOrder: ByteOrder): this.type =
putInts(array, 0, array.length)(byteOrder)
/**
* Add a number of Ints from an array to this builder.
*/
def putInts(array: Array[Int], start: Int, len: Int)(implicit byteOrder: ByteOrder): this.type =
fillByteBuffer(len * 4, byteOrder) { _.asIntBuffer.put(array, start, len) }
/**
* Add a number of Longs from an array to this builder.
*/
def putLongs(array: Array[Long])(implicit byteOrder: ByteOrder): this.type =
putLongs(array, 0, array.length)(byteOrder)
/**
* Add a number of Longs from an array to this builder.
*/
def putLongs(array: Array[Long], start: Int, len: Int)(implicit byteOrder: ByteOrder): this.type =
fillByteBuffer(len * 8, byteOrder) { _.asLongBuffer.put(array, start, len) }
/**
* Add a number of Floats from an array to this builder.
*/
def putFloats(array: Array[Float])(implicit byteOrder: ByteOrder): this.type =
putFloats(array, 0, array.length)(byteOrder)
/**
* Add a number of Floats from an array to this builder.
*/
def putFloats(array: Array[Float], start: Int, len: Int)(implicit byteOrder: ByteOrder): this.type =
fillByteBuffer(len * 4, byteOrder) { _.asFloatBuffer.put(array, start, len) }
/**
* Add a number of Doubles from an array to this builder.
*/
def putDoubles(array: Array[Double])(implicit byteOrder: ByteOrder): this.type =
putDoubles(array, 0, array.length)(byteOrder)
/**
* Add a number of Doubles from an array to this builder.
*/
def putDoubles(array: Array[Double], start: Int, len: Int)(implicit byteOrder: ByteOrder): this.type =
fillByteBuffer(len * 8, byteOrder) { _.asDoubleBuffer.put(array, start, len) }
def clear(): Unit = {
_builder.clear()
_length = 0
_tempLength = 0
}
def result: ByteString =
if (_length == 0) ByteString.empty
else {
clearTemp()
val bytestrings = _builder.result
if (bytestrings.size == 1)
bytestrings.head
else
ByteStrings(bytestrings, _length)
}
/**
* Directly wraps this ByteStringBuilder in an OutputStream. Write
* operations on the stream are forwarded to the builder.
*/
def asOutputStream: java.io.OutputStream = new java.io.OutputStream {
override def write(b: Int): Unit = builder += b.toByte
override def write(b: Array[Byte], off: Int, len: Int): Unit = { builder.putBytes(b, off, len) }
}
/**
* Tests whether this ByteStringBuilder is empty.
*/
def isEmpty: Boolean = _length == 0
/**
* Tests whether this ByteStringBuilder is not empty.
*/
def nonEmpty: Boolean = _length > 0
}
