SessionHero01
4 weeks ago
committed by
GitHub
commit
d8193c469e
@ -1,16 +0,0 @@
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<?xml version="1.0" encoding="utf-8"?>
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<RelativeLayout
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xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:app="http://schemas.android.com/apk/res-auto"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:padding="@dimen/medium_spacing">
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<com.github.ybq.android.spinkit.SpinKitView
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style="@style/SpinKitView.Large.ThreeBounce"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_centerInParent="true"
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app:SpinKit_Color="?colorAccent" />
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</RelativeLayout>
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package org.session.libsignal.utilities
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import org.junit.Assert.assertArrayEquals
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import org.junit.Assert.assertEquals
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import org.junit.Test
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import org.session.libsignal.utilities.ByteArraySlice.Companion.view
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class ByteArraySliceTest {
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@Test
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fun `view works`() {
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val sliced = byteArrayOf(1, 2, 3, 4, 5).view(1..3)
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assertEquals(listOf<Byte>(2, 3, 4), sliced.asList())
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}
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@Test
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fun `re-view works`() {
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val sliced = byteArrayOf(1, 2, 3, 4, 5).view(1..3)
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val resliced = sliced.view(1..2)
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assertEquals(listOf<Byte>(3, 4), resliced.asList())
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}
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@Test
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fun `decodeToString works`() {
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assertEquals(
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"hel",
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"hello, world".toByteArray().view(0..2).decodeToString()
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)
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}
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@Test
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fun `inputStream works`() {
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assertArrayEquals(
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"hello, world".toByteArray(),
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"hello, world".toByteArray().inputStream().readBytes()
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)
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}
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@Test
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fun `able to view empty array`() {
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val sliced = byteArrayOf().view()
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assertEquals(0, sliced.len)
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assertEquals(0, sliced.offset)
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}
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}
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@ -0,0 +1,94 @@
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package org.session.libsignal.utilities
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import java.io.ByteArrayInputStream
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import java.io.InputStream
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import java.io.OutputStream
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/**
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* A view of a byte array with a range. This is useful for avoiding copying data when slicing a byte array.
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*/
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class ByteArraySlice private constructor(
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val data: ByteArray,
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val offset: Int,
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val len: Int,
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) {
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init {
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check(offset in 0..data.size) { "Offset $offset is not within [0..${data.size}]" }
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check(len in 0..data.size) { "Length $len is not within [0..${data.size}]" }
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}
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fun view(range: IntRange): ByteArraySlice {
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val newOffset = offset + range.first
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val newLength = range.last + 1 - range.first
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return ByteArraySlice(
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data = data,
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offset = newOffset,
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len = newLength
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)
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}
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fun copyToBytes(): ByteArray {
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return data.copyOfRange(offset, offset + len)
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}
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operator fun get(index: Int): Byte {
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return data[offset + index]
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}
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fun asList(): List<Byte> {
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return object : AbstractList<Byte>() {
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override val size: Int
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get() = this@ByteArraySlice.len
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override fun get(index: Int) = this@ByteArraySlice[index]
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}
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}
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fun decodeToString(): String {
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return data.decodeToString(offset, offset + len)
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}
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fun inputStream(): InputStream {
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return ByteArrayInputStream(data, offset, len)
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}
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fun isEmpty(): Boolean = len == 0
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fun isNotEmpty(): Boolean = len != 0
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override fun equals(other: Any?): Boolean {
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if (this === other) return true
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if (other !is ByteArraySlice) return false
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if (offset != other.offset) return false
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if (len != other.len) return false
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if (!data.contentEquals(other.data)) return false
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return true
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}
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override fun hashCode(): Int {
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var result = offset
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result = 31 * result + len
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result = 31 * result + data.contentHashCode()
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return result
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}
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companion object {
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val EMPTY = ByteArraySlice(byteArrayOf(), 0, 0)
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/**
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* Create a view of a byte array
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*/
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fun ByteArray.view(range: IntRange = indices): ByteArraySlice {
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return ByteArraySlice(
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data = this,
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offset = range.first,
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len = range.last + 1 - range.first
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)
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}
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fun OutputStream.write(view: ByteArraySlice) {
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write(view.data, view.offset, view.len)
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}
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}
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}
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