Suppress manual cast warnings in task builders

Merge branch 'beta/kotlin-1.9.20' into dev
# Conflicts: # CHANGELOG.md # build.gradle.kts # dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/FileWorkspaceCache.kt # dataforge-workspace/src/jvmTest/kotlin/space/kscience/dataforge/workspace/FileDataTest.kt # gradle.properties
2023-10-24 10:52:41 +03:00 · 2023-10-24 09:04:37 +03:00 · 2023-10-08 18:21:04 +03:00 · 2023-10-08 18:20:23 +03:00 · 2023-10-08 16:55:47 +03:00 · 2023-09-16 15:20:31 +03:00
39 changed files with 555 additions and 401 deletions
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -3,14 +3,21 @@
 ## Unreleased

 ### Added
+- Added separate `Meta`, `SealedMeta` and `ObservableMutableMeta` builders.

 ### Changed
+- Kotlin 1.9.20.
+- Migrated from ktor-io to kotlinx-io.
+- `MutableMeta` builder now returns a simplified version of meta that does not hold listeners. 
+- Ktor-io is replaced with kotlinx-io.
+- More concise names for read/write methods in IO.

 ### Deprecated

 ### Removed

 ### Fixed
+- Memory leak in SealedMeta builder

 ### Security

--- a/build.gradle.kts
+++ b/build.gradle.kts
@ -1,5 +1,4 @@
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
-import space.kscience.gradle.isInDevelopment
 import space.kscience.gradle.useApache2Licence
 import space.kscience.gradle.useSPCTeam

@ -9,7 +8,7 @@ plugins {

 allprojects {
    group = "space.kscience"
-    version = "0.6.2"
+    version = "0.6.3-dev-1"
 }

 subprojects {
@ -31,14 +30,7 @@ ksciencePublish {
        useApache2Licence()
        useSPCTeam()
    }
-    github("dataforge-core", "SciProgCentre")
-    space(
-        if (isInDevelopment) {
-            "https://maven.pkg.jetbrains.space/spc/p/sci/dev"
-        } else {
-            "https://maven.pkg.jetbrains.space/spc/p/sci/maven"
-        }
-    )
+    repository("spc","https://maven.sciprog.center/kscience")
    sonatype()
 }

--- a/dataforge-io/build.gradle.kts
+++ b/dataforge-io/build.gradle.kts
@ -1,11 +1,11 @@
-import space.kscience.gradle.KScienceVersions
-
 plugins {
    id("space.kscience.gradle.mpp")
 }

 description = "IO module"

+val ioVersion = "0.2.1"
+
 kscience {
    jvm()
    js()
@ -15,11 +15,12 @@ kscience {
        cbor()
    }
    dependencies {
-        api(project(":dataforge-context"))
-        api("io.ktor:ktor-io:${KScienceVersions.ktorVersion}")
+        api(projects.dataforgeContext)
+        api("org.jetbrains.kotlinx:kotlinx-io-core:$ioVersion")
+        api("org.jetbrains.kotlinx:kotlinx-io-bytestring:$ioVersion")
    }
 }

 readme{
-    maturity = space.kscience.gradle.Maturity.PROTOTYPE
+    maturity = space.kscience.gradle.Maturity.EXPERIMENTAL
 }
--- a/dataforge-io/dataforge-io-yaml/src/commonMain/kotlin/space/kscience/dataforge/io/yaml/FrontMatterEnvelopeFormat.kt
+++ b/dataforge-io/dataforge-io-yaml/src/commonMain/kotlin/space/kscience/dataforge/io/yaml/FrontMatterEnvelopeFormat.kt
@ -1,7 +1,11 @@
 package space.kscience.dataforge.io.yaml

-import io.ktor.utils.io.core.Input
-import io.ktor.utils.io.core.Output
+import kotlinx.io.Sink
+import kotlinx.io.Source
+import kotlinx.io.bytestring.ByteString
+import kotlinx.io.bytestring.encodeToByteString
+import kotlinx.io.readByteString
+import kotlinx.io.writeString
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.io.*
@ -15,49 +19,49 @@ public class FrontMatterEnvelopeFormat(
    private val metaFormatFactory: MetaFormatFactory = YamlMetaFormat,
 ) : EnvelopeFormat {

-    override fun readObject(binary: Binary): Envelope = binary.read {
+    override fun readFrom(binary: Binary): Envelope = binary.read {
        var offset = 0

        offset += discardWithSeparator(
-            SEPARATOR.encodeToByteArray(),
+            SEPARATOR,
            atMost = 1024,
        )

        val line = ByteArray {
-            offset += readWithSeparatorTo(this, "\n".encodeToByteArray())
+            offset += readWithSeparatorTo(this, "\n".encodeToByteString())
        }.decodeToString()

        val readMetaFormat = line.trim().takeIf { it.isNotBlank() }?.let { io.resolveMetaFormat(it) } ?: YamlMetaFormat

        val packet = ByteArray {
-            offset += readWithSeparatorTo(this, SEPARATOR.encodeToByteArray())
+            offset += readWithSeparatorTo(this, SEPARATOR)
        }

        offset += discardLine()

-        val meta = readMetaFormat.readObject(packet.asBinary())
+        val meta = readMetaFormat.readFrom(packet.asBinary())
        Envelope(meta, binary.view(offset))
    }

-    override fun readObject(input: Input): Envelope = readObject(input.readBinary())
+    override fun readFrom(source: Source): Envelope = readFrom(source.readBinary())

-    override fun writeObject(
-        output: Output,
+    override fun writeTo(
+        sink: Sink,
        obj: Envelope,
    ) {
        val metaFormat = metaFormatFactory.build(io.context, meta)
        val formatSuffix = if (metaFormat is YamlMetaFormat) "" else metaFormatFactory.shortName
-        output.writeRawString("$SEPARATOR${formatSuffix}\r\n")
-        metaFormat.run { metaFormat.writeObject(output, obj.meta) }
-        output.writeRawString("$SEPARATOR\r\n")
+        sink.writeString("$SEPARATOR${formatSuffix}\r\n")
+        metaFormat.run { metaFormat.writeTo(sink, obj.meta) }
+        sink.writeString("$SEPARATOR\r\n")
        //Printing data
        obj.data?.let { data ->
-            output.writeBinary(data)
+            sink.writeBinary(data)
        }
    }

    public companion object : EnvelopeFormatFactory {
-        public const val SEPARATOR: String = "---"
+        public val SEPARATOR: ByteString = "---".encodeToByteString()

        private val metaTypeRegex = "---(\\w*)\\s*".toRegex()

@ -69,8 +73,8 @@ public class FrontMatterEnvelopeFormat(

        override fun peekFormat(io: IOPlugin, binary: Binary): EnvelopeFormat? = binary.read {
            //read raw string to avoid UTF issues
-            val line = readRawString(3)
-            return@read if (line == "---") {
+            val line = readByteString(3)
+            return@read if (line == "---".encodeToByteString()) {
                default
            } else {
                null
@ -79,15 +83,15 @@ public class FrontMatterEnvelopeFormat(

        private val default by lazy { build(Global, Meta.EMPTY) }

-        override fun readObject(binary: Binary): Envelope = default.readObject(binary)
+        override fun readFrom(binary: Binary): Envelope = default.readFrom(binary)

-        override fun writeObject(
-            output: Output,
+        override fun writeTo(
+            sink: Sink,
            obj: Envelope,
-        ): Unit = default.writeObject(output, obj)
+        ): Unit = default.writeTo(sink, obj)


-        override fun readObject(input: Input): Envelope = default.readObject(input)
+        override fun readFrom(source: Source): Envelope = default.readFrom(source)

    }
 }
--- a/dataforge-io/dataforge-io-yaml/src/commonMain/kotlin/space/kscience/dataforge/io/yaml/YamlMetaFormat.kt
+++ b/dataforge-io/dataforge-io-yaml/src/commonMain/kotlin/space/kscience/dataforge/io/yaml/YamlMetaFormat.kt
@ -1,13 +1,13 @@
 package space.kscience.dataforge.io.yaml

-import io.ktor.utils.io.core.Input
-import io.ktor.utils.io.core.Output
+import kotlinx.io.Sink
+import kotlinx.io.Source
+import kotlinx.io.readString
+import kotlinx.io.writeString
 import net.mamoe.yamlkt.*
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.io.MetaFormat
 import space.kscience.dataforge.io.MetaFormatFactory
-import space.kscience.dataforge.io.readUtf8String
-import space.kscience.dataforge.io.writeUtf8String
 import space.kscience.dataforge.meta.*
 import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.meta.descriptors.get
@ -89,14 +89,14 @@ public fun YamlMap.toMeta(): Meta = YamlMeta(this)
 */
 public class YamlMetaFormat(private val meta: Meta) : MetaFormat {

-    override fun writeMeta(output: Output, meta: Meta, descriptor: MetaDescriptor?) {
+    override fun writeMeta(sink: Sink, meta: Meta, descriptor: MetaDescriptor?) {
        val yaml: YamlMap = meta.toYaml()
        val string = Yaml.encodeToString(YamlMap.serializer(), yaml)
-        output.writeUtf8String(string)
+        sink.writeString(string)
    }

-    override fun readMeta(input: Input, descriptor: MetaDescriptor?): Meta {
-        val yaml = Yaml.decodeYamlMapFromString(input.readUtf8String())
+    override fun readMeta(source: Source, descriptor: MetaDescriptor?): Meta {
+        val yaml = Yaml.decodeYamlMapFromString(source.readString())
        return yaml.toMeta()
    }

@ -109,10 +109,10 @@ public class YamlMetaFormat(private val meta: Meta) : MetaFormat {

        private val default = YamlMetaFormat(Meta.EMPTY)

-        override fun writeMeta(output: Output, meta: Meta, descriptor: MetaDescriptor?): Unit =
-            default.writeMeta(output, meta, descriptor)
+        override fun writeMeta(sink: Sink, meta: Meta, descriptor: MetaDescriptor?): Unit =
+            default.writeMeta(sink, meta, descriptor)

-        override fun readMeta(input: Input, descriptor: MetaDescriptor?): Meta =
-            default.readMeta(input, descriptor)
+        override fun readMeta(source: Source, descriptor: MetaDescriptor?): Meta =
+            default.readMeta(source, descriptor)
    }
 }
--- a/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/Binary.kt
+++ b/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/Binary.kt
@ -1,6 +1,9 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.*
+import kotlinx.io.Sink
+import kotlinx.io.Source
+import kotlinx.io.buffered
+import kotlinx.io.readByteArray
 import kotlin.math.min

 /**
@ -17,13 +20,13 @@ public interface Binary {
     * Read maximum of [atMost] bytes as input from the binary, starting at [offset]. The generated input is always closed
     * when leaving scope, so it could not be leaked outside of scope of [block].
     */
-    public fun <R> read(offset: Int = 0, atMost: Int = size - offset, block: Input.() -> R): R
+    public fun <R> read(offset: Int = 0, atMost: Int = size - offset, block: Source.() -> R): R

-    public suspend fun <R> readSuspend(offset: Int = 0, atMost: Int = size - offset, block: suspend Input.() -> R): R
+    public suspend fun <R> readSuspend(offset: Int = 0, atMost: Int = size - offset, block: suspend Source.() -> R): R

    /**
     * Read a binary with given [offset] relative to this binary and given [binarySize].
-     * In general, resulting binary is of the same type as this one, but it is not guaranteed.
+     * In general, the resulting binary is of the same type as this one, but it is not guaranteed.
     */
    public fun view(offset: Int, binarySize: Int = size - offset): Binary

@ -38,25 +41,27 @@ internal class ByteArrayBinary(
    override val size: Int = array.size - start,
 ) : Binary {

-    override fun <R> read(offset: Int, atMost: Int, block: Input.() -> R): R {
+    override fun <R> read(offset: Int, atMost: Int, block: Source.() -> R): R {
        require(offset >= 0) { "Offset must be positive" }
        require(offset < array.size) { "Offset $offset is larger than array size" }
-        val input = ByteReadPacket(
+
+        return ByteArraySource(
            array,
            offset + start,
            min(atMost, size - offset)
-        )
-        return input.use(block)
+        ).buffered().use(block)
    }

-    override suspend fun <R> readSuspend(offset: Int, atMost: Int, block: suspend Input.() -> R): R {
+    override suspend fun <R> readSuspend(offset: Int, atMost: Int, block: suspend Source.() -> R): R {
        require(offset >= 0) { "Offset must be positive" }
        require(offset < array.size) { "Offset $offset is larger than array size" }
-        val input = ByteReadPacket(
+
+        val input = ByteArraySource(
            array,
            offset + start,
            min(atMost, size - offset)
-        )
+        ).buffered()
+
        return try {
            block(input)
        } finally {
@ -77,26 +82,26 @@ public fun Binary.toByteArray(): ByteArray = if (this is ByteArrayBinary) {
    array.copyOfRange(start, start + size) // TODO do we need to ensure data safety here?
 } else {
    read {
-        readBytes()
+        readByteArray()
    }
 }

 //TODO optimize for file-based Inputs
-public fun Input.readBinary(size: Int? = null): Binary {
-    val array = if (size == null) readBytes() else readBytes(size)
+public fun Source.readBinary(size: Int? = null): Binary {
+    val array = if (size == null) readByteArray() else readByteArray(size)
    return ByteArrayBinary(array)
 }

 /**
 * Direct write of binary to the output. Returns the number of bytes written
 */
-public fun Output.writeBinary(binary: Binary): Int {
+public fun Sink.writeBinary(binary: Binary): Int {
    return if (binary is ByteArrayBinary) {
-        writeFully(binary.array, binary.start, binary.start + binary.size)
+        write(binary.array, binary.start, binary.start + binary.size)
        binary.size
    } else {
        binary.read {
-            copyTo(this@writeBinary).toInt()
+            transferTo(this@writeBinary).toInt()
        }
    }
 }
--- a/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/EnvelopeBuilder.kt
+++ b/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/EnvelopeBuilder.kt
@ -1,6 +1,6 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.Output
+import kotlinx.io.Sink
 import space.kscience.dataforge.meta.*

 public class EnvelopeBuilder : Envelope {
@ -33,7 +33,7 @@ public class EnvelopeBuilder : Envelope {
    /**
     * Construct a data binary from given builder
     */
-    public inline fun data(block: Output.() -> Unit) {
+    public inline fun data(block: Sink.() -> Unit) {
        data = ByteArray { block() }.asBinary()
    }

--- a/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/EnvelopeFormat.kt
+++ b/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/EnvelopeFormat.kt
@ -1,6 +1,6 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.Input
+import kotlinx.io.Source
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.io.EnvelopeFormatFactory.Companion.ENVELOPE_FORMAT_TYPE
 import space.kscience.dataforge.meta.Meta
@ -15,7 +15,7 @@ public interface EnvelopeFormat : IOFormat<Envelope> {
    override val type: KType get() = typeOf<Envelope>()
 }

-public fun EnvelopeFormat.read(input: Input): Envelope = readObject(input)
+public fun EnvelopeFormat.read(input: Source): Envelope = readFrom(input)

@Type(ENVELOPE_FORMAT_TYPE)
 public interface EnvelopeFormatFactory : IOFormatFactory<Envelope>, EnvelopeFormat {
--- a/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/EnvelopeParts.kt
+++ b/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/EnvelopeParts.kt
@ -1,5 +1,8 @@
 package space.kscience.dataforge.io

+import kotlinx.io.bytestring.ByteString
+import kotlinx.io.bytestring.decodeToString
+import kotlinx.io.write
 import space.kscience.dataforge.io.Envelope.Companion.ENVELOPE_NODE_KEY
 import space.kscience.dataforge.io.PartDescriptor.Companion.DEFAULT_MULTIPART_DATA_SEPARATOR
 import space.kscience.dataforge.io.PartDescriptor.Companion.MULTIPART_DATA_TYPE
@ -20,7 +23,7 @@ private class PartDescriptor : Scheme() {
        val PARTS_KEY = MULTIPART_KEY + "parts"
        val SEPARATOR_KEY = MULTIPART_KEY + "separator"

-        const val DEFAULT_MULTIPART_DATA_SEPARATOR = "\r\n#~PART~#\r\n"
+        val DEFAULT_MULTIPART_DATA_SEPARATOR = "\r\n#~PART~#\r\n".toAsciiByteString()

        const val MULTIPART_DATA_TYPE = "envelope.multipart"
    }
@ -32,12 +35,12 @@ public typealias EnvelopeParts = List<EnvelopePart>

 public fun EnvelopeBuilder.multipart(
    parts: EnvelopeParts,
-    separator: String = DEFAULT_MULTIPART_DATA_SEPARATOR,
+    separator: ByteString = DEFAULT_MULTIPART_DATA_SEPARATOR,
 ) {
    dataType = MULTIPART_DATA_TYPE

    var offsetCounter = 0
-    val separatorSize = separator.length
+    val separatorSize = separator.size
    val partDescriptors = parts.map { (binary, description) ->
        offsetCounter += separatorSize
        PartDescriptor {
@ -51,14 +54,14 @@ public fun EnvelopeBuilder.multipart(

    meta {
        if (separator != DEFAULT_MULTIPART_DATA_SEPARATOR) {
-            SEPARATOR_KEY put separator
+            SEPARATOR_KEY put separator.decodeToString()
        }
        setIndexed(PARTS_KEY, partDescriptors.map { it.toMeta() })
    }

    data {
        parts.forEach {
-            writeRawString(separator)
+            write(separator)
            writeBinary(it.binary)
        }
    }
@ -69,7 +72,7 @@ public fun EnvelopeBuilder.multipart(
 */
 public fun EnvelopeBuilder.envelopes(
    envelopes: List<Envelope>,
-    separator: String = DEFAULT_MULTIPART_DATA_SEPARATOR,
+    separator: ByteString = DEFAULT_MULTIPART_DATA_SEPARATOR,
 ) {
    val parts = envelopes.map {
        val binary = Binary(it, TaggedEnvelopeFormat)
--- a/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/IOFormat.kt
+++ b/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/IOFormat.kt
@ -1,6 +1,8 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.*
+import kotlinx.io.Sink
+import kotlinx.io.Source
+import kotlinx.io.readByteArray
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Factory
 import space.kscience.dataforge.io.IOFormatFactory.Companion.IO_FORMAT_TYPE
@ -21,9 +23,9 @@ public interface IOReader<out T> {
     */
    public val type: KType

-    public fun readObject(input: Input): T
+    public fun readFrom(source: Source): T

-    public fun readObject(binary: Binary): T = binary.read { readObject(this) }
+    public fun readFrom(binary: Binary): T = binary.read { readFrom(this) }

    public companion object {
        /**
@ -32,21 +34,21 @@ public interface IOReader<out T> {
        public val binary: IOReader<Binary> = object : IOReader<Binary> {
            override val type: KType = typeOf<Binary>()

-            override fun readObject(input: Input): Binary = input.readBytes().asBinary()
+            override fun readFrom(source: Source): Binary = source.readByteArray().asBinary()

-            override fun readObject(binary: Binary): Binary = binary
+            override fun readFrom(binary: Binary): Binary = binary
        }
    }
 }

-public inline fun <reified T> IOReader(crossinline read: Input.() -> T): IOReader<T> = object : IOReader<T> {
+public inline fun <reified T> IOReader(crossinline read: Source.() -> T): IOReader<T> = object : IOReader<T> {
    override val type: KType = typeOf<T>()

-    override fun readObject(input: Input): T = input.read()
+    override fun readFrom(source: Source): T = source.read()
 }

 public fun interface IOWriter<in T> {
-    public fun writeObject(output: Output, obj: T)
+    public fun writeTo(sink: Sink, obj: T)
 }

 /**
@ -54,21 +56,20 @@ public fun interface IOWriter<in T> {
 */
 public interface IOFormat<T> : IOReader<T>, IOWriter<T>

-public fun <T : Any> Input.readObject(format: IOReader<T>): T = format.readObject(this@readObject)
+public fun <T : Any> Source.readWith(format: IOReader<T>): T = format.readFrom(this)

-public fun <T : Any> IOFormat<T>.readObjectFrom(binary: Binary): T = binary.read {
-    readObject(this)
+/**
+ * Read given binary as an object using given format
+ */
+public fun <T : Any> Binary.readWith(format: IOReader<T>): T = read {
+    readWith(format)
 }

 /**
- * Read given binary as object using given format
+ * Write an object to the [Sink] with given [format]
 */
-public fun <T : Any> Binary.readWith(format: IOReader<T>): T = read {
-    readObject(format)
-}
-
-public fun <T : Any> Output.writeObject(format: IOWriter<T>, obj: T): Unit =
-    format.writeObject(this@writeObject, obj)
+public fun <T : Any> Sink.writeWith(format: IOWriter<T>, obj: T): Unit =
+    format.writeTo(this, obj)


@Type(IO_FORMAT_TYPE)
@ -85,7 +86,7 @@ public interface IOFormatFactory<T : Any> : Factory<IOFormat<T>>, Named {
    }
 }

-public fun <T : Any> Binary(obj: T, format: IOWriter<T>): Binary = Binary { format.writeObject(this, obj) }
+public fun <T : Any> Binary(obj: T, format: IOWriter<T>): Binary = Binary { format.writeTo(this, obj) }

 public object DoubleIOFormat : IOFormat<Double>, IOFormatFactory<Double> {
    override fun build(context: Context, meta: Meta): IOFormat<Double> = this
@ -94,9 +95,9 @@ public object DoubleIOFormat : IOFormat<Double>, IOFormatFactory<Double> {

    override val type: KType get() = typeOf<Double>()

-    override fun writeObject(output: Output, obj: Double) {
-        output.writeDouble(obj)
+    override fun writeTo(sink: Sink, obj: Double) {
+        sink.writeLong(obj.toBits())
    }

-    override fun readObject(input: Input): Double = input.readDouble()
+    override fun readFrom(source: Source): Double = Double.fromBits(source.readLong())
 }
--- a/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/JsonMetaFormat.kt
+++ b/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/JsonMetaFormat.kt
@ -1,10 +1,10 @@
-@file:Suppress("UNUSED_PARAMETER")
-
 package space.kscience.dataforge.io


-import io.ktor.utils.io.core.Input
-import io.ktor.utils.io.core.Output
+import kotlinx.io.Sink
+import kotlinx.io.Source
+import kotlinx.io.readString
+import kotlinx.io.writeString
 import kotlinx.serialization.json.Json
 import kotlinx.serialization.json.JsonElement
 import space.kscience.dataforge.context.Context
@ -18,13 +18,13 @@ import space.kscience.dataforge.meta.toMeta
 */
 public class JsonMetaFormat(private val json: Json = DEFAULT_JSON) : MetaFormat {

-    override fun writeMeta(output: Output, meta: Meta, descriptor: MetaDescriptor?) {
+    override fun writeMeta(sink: Sink, meta: Meta, descriptor: MetaDescriptor?) {
        val jsonElement = meta.toJson(descriptor)
-        output.writeUtf8String(json.encodeToString(JsonElement.serializer(), jsonElement))
+        sink.writeString(json.encodeToString(JsonElement.serializer(), jsonElement))
    }

-    override fun readMeta(input: Input, descriptor: MetaDescriptor?): Meta {
-        val str = input.readUtf8String()//readByteArray().decodeToString()
+    override fun readMeta(source: Source, descriptor: MetaDescriptor?): Meta {
+        val str = source.readString()
        val jsonElement = json.parseToJsonElement(str)
        return jsonElement.toMeta(descriptor)
    }
@ -39,10 +39,10 @@ public class JsonMetaFormat(private val json: Json = DEFAULT_JSON) : MetaFormat

        private val default = JsonMetaFormat()

-        override fun writeMeta(output: Output, meta: Meta, descriptor: MetaDescriptor?): Unit =
-            default.run { writeMeta(output, meta, descriptor) }
+        override fun writeMeta(sink: Sink, meta: Meta, descriptor: MetaDescriptor?): Unit =
+            default.run { writeMeta(sink, meta, descriptor) }

-        override fun readMeta(input: Input, descriptor: MetaDescriptor?): Meta =
-            default.run { readMeta(input, descriptor) }
+        override fun readMeta(source: Source, descriptor: MetaDescriptor?): Meta =
+            default.run { readMeta(source, descriptor) }
    }
 }
--- a/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/MetaFormat.kt
+++ b/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/MetaFormat.kt
@ -1,9 +1,9 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.ByteReadPacket
-import io.ktor.utils.io.core.Input
-import io.ktor.utils.io.core.Output
-import io.ktor.utils.io.core.use
+
+import kotlinx.io.Sink
+import kotlinx.io.Source
+import kotlinx.io.buffered
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.io.MetaFormatFactory.Companion.META_FORMAT_TYPE
@ -23,19 +23,19 @@ public interface MetaFormat : IOFormat<Meta> {

    override val type: KType get() = typeOf<Meta>()

-    override fun writeObject(output: Output, obj: Meta) {
-        writeMeta(output, obj, null)
+    override fun writeTo(sink: Sink, obj: Meta) {
+        writeMeta(sink, obj, null)
    }

-    override fun readObject(input: Input): Meta = readMeta(input)
+    override fun readFrom(source: Source): Meta = readMeta(source)

    public fun writeMeta(
-        output: Output,
+        sink: Sink,
        meta: Meta,
        descriptor: MetaDescriptor? = null,
    )

-    public fun readMeta(input: Input, descriptor: MetaDescriptor? = null): Meta
+    public fun readMeta(source: Source, descriptor: MetaDescriptor? = null): Meta
 }

@Type(META_FORMAT_TYPE)
@ -57,15 +57,13 @@ public interface MetaFormatFactory : IOFormatFactory<Meta>, MetaFormat {

 public fun Meta.toString(format: MetaFormat): String = ByteArray {
    format.run {
-        writeObject(this@ByteArray, this@toString)
+        writeTo(this@ByteArray, this@toString)
    }
 }.decodeToString()

 public fun Meta.toString(formatFactory: MetaFormatFactory): String = toString(formatFactory.build(Global, Meta.EMPTY))

-public fun MetaFormat.parse(str: String): Meta {
-    return ByteReadPacket(str.encodeToByteArray()).use { readObject(it) }
-}
+public fun MetaFormat.parse(str: String): Meta = readFrom(StringSource(str).buffered())

 public fun MetaFormatFactory.parse(str: String, formatMeta: Meta): Meta = build(Global, formatMeta).parse(str)

--- a/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/TaggedEnvelopeFormat.kt
+++ b/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/TaggedEnvelopeFormat.kt
@ -1,6 +1,7 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.*
+import kotlinx.io.*
+import kotlinx.io.bytestring.decodeToString
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.meta.Meta
@ -18,7 +19,7 @@ import space.kscience.dataforge.names.plus
 public class TaggedEnvelopeFormat(
    public val io: IOPlugin,
    public val version: VERSION = VERSION.DF02,
-    public val metaFormatFactory: MetaFormatFactory = JsonMetaFormat
+    public val metaFormatFactory: MetaFormatFactory = JsonMetaFormat,
 ) : EnvelopeFormat {

 //    private val metaFormat = io.metaFormat(metaFormatKey)
@ -26,59 +27,60 @@ public class TaggedEnvelopeFormat(


    private fun Tag.toBinary() = Binary {
-        writeRawString(START_SEQUENCE)
-        writeRawString(version.name)
+        write(START_SEQUENCE)
+        writeString(version.name)
        writeShort(metaFormatKey)
        writeUInt(metaSize)
        when (version) {
            VERSION.DF02 -> {
                writeUInt(dataSize.toUInt())
            }
+
            VERSION.DF03 -> {
                writeULong(dataSize)
            }
        }
-        writeRawString(END_SEQUENCE)
+        write(END_SEQUENCE)
    }

-    override fun writeObject(
-        output: Output,
+    override fun writeTo(
+        sink: Sink,
        obj: Envelope,
    ) {
        val metaFormat = metaFormatFactory.build(io.context, Meta.EMPTY)
        val metaBytes = Binary(obj.meta, metaFormat)
        val actualSize: ULong = (obj.data?.size ?: 0).toULong()
        val tag = Tag(metaFormatFactory.key, metaBytes.size.toUInt() + 2u, actualSize)
-        output.writeBinary(tag.toBinary())
-        output.writeBinary(metaBytes)
-        output.writeRawString("\r\n")
+        sink.writeBinary(tag.toBinary())
+        sink.writeBinary(metaBytes)
+        sink.writeString("\r\n")
        obj.data?.let {
-            output.writeBinary(it)
+            sink.writeBinary(it)
        }
    }

    /**
     * Read an envelope from input into memory
     *
-     * @param input an input to read from
+     * @param source an input to read from
     * @param formats a collection of meta formats to resolve
     */
-    override fun readObject(input: Input): Envelope {
-        val tag = input.readTag(this.version)
+    override fun readFrom(source: Source): Envelope {
+        val tag = source.readTag(this.version)

        val metaFormat = io.resolveMetaFormat(tag.metaFormatKey)
            ?: error("Meta format with key ${tag.metaFormatKey} not found")

-        val metaBinary = input.readBinary(tag.metaSize.toInt())
+        val metaBinary = source.readBinary(tag.metaSize.toInt())

-        val meta: Meta = metaFormat.readObjectFrom(metaBinary)
+        val meta: Meta = metaFormat.readFrom(metaBinary)

-        val data = input.readBinary(tag.dataSize.toInt())
+        val data = source.readBinary(tag.dataSize.toInt())

        return SimpleEnvelope(meta, data)
    }

-    override fun readObject(binary: Binary): Envelope = binary.read{
+    override fun readFrom(binary: Binary): Envelope = binary.read {
        val tag = readTag(version)

        val metaFormat = io.resolveMetaFormat(tag.metaFormatKey)
@ -86,7 +88,7 @@ public class TaggedEnvelopeFormat(

        val metaBinary = readBinary(tag.metaSize.toInt())

-        val meta: Meta = metaFormat.readObjectFrom(metaBinary)
+        val meta: Meta = metaFormat.readFrom(metaBinary)


        SimpleEnvelope(meta, binary.view((version.tagSize + tag.metaSize).toInt(), tag.dataSize.toInt()))
@ -104,8 +106,8 @@ public class TaggedEnvelopeFormat(
    }

    public companion object : EnvelopeFormatFactory {
-        private const val START_SEQUENCE = "#~"
-        private const val END_SEQUENCE = "~#\r\n"
+        private val START_SEQUENCE = "#~".toAsciiByteString()
+        private val END_SEQUENCE = "~#\r\n".toAsciiByteString()

        override val name: Name = EnvelopeFormatFactory.ENVELOPE_FACTORY_NAME + "tagged"

@ -121,27 +123,26 @@ public class TaggedEnvelopeFormat(
            return TaggedEnvelopeFormat(io, version)
        }

-        private fun Input.readTag(version: VERSION): Tag {
-            val start = readRawString(2)
+        private fun Source.readTag(version: VERSION): Tag {
+            val start = readByteString(2)
            if (start != START_SEQUENCE) error("The input is not an envelope")
-            val versionString = readRawString(4)
-            if (version.name != versionString) error("Wrong version of DataForge: expected $version but found $versionString")
+            val versionString = readByteString(4)
+            if (version.name.toAsciiByteString() != versionString) error("Wrong version of DataForge: expected $version but found $versionString")
            val metaFormatKey = readShort()
            val metaLength = readUInt()
            val dataLength: ULong = when (version) {
                VERSION.DF02 -> readUInt().toULong()
                VERSION.DF03 -> readULong()
            }
-            val end = readRawString(4)
+            val end = readByteString(4)
            if (end != END_SEQUENCE) error("The input is not an envelope")
            return Tag(metaFormatKey, metaLength, dataLength)
        }

-        override fun peekFormat(io: IOPlugin, binary: Binary): EnvelopeFormat? {
-            return try {
+        override fun peekFormat(io: IOPlugin, binary: Binary): EnvelopeFormat? = try {
            binary.read {
-                    val header = readRawString(6)
-                    return@read when (header.substring(2..5)) {
+                val header = readByteString(6)
+                when (header.substring(2, 6).decodeToString()) {
                    VERSION.DF02.name -> TaggedEnvelopeFormat(io, VERSION.DF02)
                    VERSION.DF03.name -> TaggedEnvelopeFormat(io, VERSION.DF03)
                    else -> null
@ -150,24 +151,20 @@ public class TaggedEnvelopeFormat(
        } catch (ex: Exception) {
            null
        }
-        }

        private val default by lazy { build(Global, Meta.EMPTY) }

-        override fun readObject(binary: Binary): Envelope =
-            default.run { readObject(binary) }
+        override fun readFrom(binary: Binary): Envelope =
+            default.run { readFrom(binary) }

-        override fun writeObject(
-            output: Output,
+        override fun writeTo(
+            sink: Sink,
            obj: Envelope,
        ): Unit = default.run {
-            writeObject(
-                output,
-                obj,
-            )
+            writeTo(sink, obj)
        }

-        override fun readObject(input: Input): Envelope = default.readObject(input)
+        override fun readFrom(source: Source): Envelope = default.readFrom(source)
    }

 }
--- a/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/TaglessEnvelopeFormat.kt
+++ b/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/TaglessEnvelopeFormat.kt
@ -1,9 +1,9 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.ByteReadPacket
-import io.ktor.utils.io.core.Input
-import io.ktor.utils.io.core.Output
-import io.ktor.utils.io.core.readUTF8UntilDelimiterTo
+
+import kotlinx.io.*
+import kotlinx.io.bytestring.ByteString
+import kotlinx.io.bytestring.encodeToByteString
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.meta.Meta
@ -28,35 +28,36 @@ public class TaglessEnvelopeFormat(
 //        writeFully("#? $key: $value;\r\n".encodeToByteArray())
 //    }

-    override fun writeObject(
-        output: Output,
+    override fun writeTo(
+        sink: Sink,
        obj: Envelope,
    ) {
        val metaFormat = metaFormatFactory.build(this.io.context, meta)

        //printing header
-        output.writeRawString(TAGLESS_ENVELOPE_HEADER + "\r\n")
+        sink.write(TAGLESS_ENVELOPE_HEADER)
+        sink.writeString("\r\n")

        //Printing meta
        if (!obj.meta.isEmpty()) {
            val metaBinary = Binary(obj.meta, metaFormat)
-            output.writeUtf8String(META_START + "-${metaFormatFactory.shortName}\r\n")
-            output.writeBinary(metaBinary)
-            output.writeRawString("\r\n")
+            sink.writeString(META_START + "-${metaFormatFactory.shortName}\r\n")
+            sink.writeBinary(metaBinary)
+            sink.writeString("\r\n")
        }

        //Printing data
        obj.data?.let { data ->
            //val actualSize: Int = envelope.data?.size ?: 0
-            output.writeUtf8String(DATA_START + "\r\n")
-            output.writeBinary(data)
+            sink.writeString(DATA_START + "\r\n")
+            sink.writeBinary(data)
        }
    }

-    override fun readObject(input: Input): Envelope {
+    override fun readFrom(source: Source): Envelope {
        //read preamble
-        input.discardWithSeparator(
-            TAGLESS_ENVELOPE_HEADER.encodeToByteArray(),
+        source.discardWithSeparator(
+            TAGLESS_ENVELOPE_HEADER,
            atMost = 1024,
        )

@ -64,22 +65,22 @@ public class TaglessEnvelopeFormat(

        var data: Binary? = null

-        input.discardWithSeparator(
+        source.discardWithSeparator(
            SEPARATOR_PREFIX,
            atMost = 1024,
        )

        var header: String = ByteArray {
-            input.readUTF8UntilDelimiterTo(this, "\n")
+            source.readWithSeparatorTo(this, "\n".encodeToByteString())
        }.decodeToString()

-        while (!input.endOfInput) {
+        while (!source.exhausted()) {
            val block = ByteArray {
-                input.readWithSeparatorTo(this, SEPARATOR_PREFIX)
+                source.readWithSeparatorTo(this, SEPARATOR_PREFIX)
            }

            val nextHeader = ByteArray {
-                input.readWithSeparatorTo(this, "\n".encodeToByteArray())
+                source.readWithSeparatorTo(this, "\n".encodeToByteString())
            }.decodeToString()

            //terminate on end
@ -89,7 +90,7 @@ public class TaglessEnvelopeFormat(
            if (header.startsWith("META")) {
                //TODO check format
                val metaFormat: MetaFormatFactory = JsonMetaFormat
-                meta = metaFormat.readMeta(ByteReadPacket(block))
+                meta = metaFormat.readMeta(ByteArraySource(block).buffered())
            }

            if (header.startsWith("DATA")) {
@ -111,9 +112,9 @@ public class TaglessEnvelopeFormat(

        public const val TAGLESS_ENVELOPE_TYPE: String = "tagless"

-        public val SEPARATOR_PREFIX: ByteArray = "\n#~".encodeToByteArray()
+        public val SEPARATOR_PREFIX: ByteString = "\n#~".encodeToByteString()

-        public const val TAGLESS_ENVELOPE_HEADER: String = "#~DFTL"
+        public val TAGLESS_ENVELOPE_HEADER: ByteString = "#~DFTL".encodeToByteString()

        //        public const val META_START_PROPERTY: String = "metaSeparator"
        public const val META_START: String = "#~META"
@ -131,24 +132,21 @@ public class TaglessEnvelopeFormat(

        private val default by lazy { build(Global, Meta.EMPTY) }

-        override fun readObject(binary: Binary): Envelope = default.run { readObject(binary) }
+        override fun readFrom(binary: Binary): Envelope = default.run { readFrom(binary) }

-        override fun writeObject(
-            output: Output,
+        override fun writeTo(
+            sink: Sink,
            obj: Envelope,
        ): Unit = default.run {
-            writeObject(
-                output,
-                obj,
-            )
+            writeTo(sink, obj)
        }

-        override fun readObject(input: Input): Envelope = default.readObject(input)
+        override fun readFrom(source: Source): Envelope = default.readFrom(source)

        override fun peekFormat(io: IOPlugin, binary: Binary): EnvelopeFormat? {
            return try {
                binary.read {
-                    val string = readRawString(TAGLESS_ENVELOPE_HEADER.length)
+                    val string = readByteString(TAGLESS_ENVELOPE_HEADER.size)
                    return@read if (string == TAGLESS_ENVELOPE_HEADER) {
                        TaglessEnvelopeFormat(io)
                    } else {
--- a/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/ioMisc.kt
+++ b/dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/ioMisc.kt
@ -1,40 +1,41 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.bits.Memory
-import io.ktor.utils.io.charsets.Charsets
-import io.ktor.utils.io.charsets.decodeExactBytes
-import io.ktor.utils.io.core.*
-import io.ktor.utils.io.core.internal.ChunkBuffer
+import kotlinx.io.*
+import kotlinx.io.bytestring.ByteString
+import kotlinx.io.bytestring.decodeToString
+import kotlinx.io.bytestring.encodeToByteString
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.misc.DFExperimental
+import kotlin.math.min

-public fun Output.writeRawString(str: String) {
-    writeFully(str.toByteArray(Charsets.ISO_8859_1))
+/**
+ * Convert a string literal, containing only ASCII characters to a [ByteString].
+ * Throws an error if there are non-ASCII characters.
+ */
+public fun String.toAsciiByteString(): ByteString {
+    val bytes = ByteArray(length) {
+        val char = get(it)
+        val code = char.code
+        if (code > Byte.MAX_VALUE) error("Symbol $char is not ASCII symbol") else code.toByte()
+    }
+    return ByteString(bytes)
 }

-public fun Output.writeUtf8String(str: String) {
-    writeFully(str.encodeToByteArray())
-}
+public inline fun Buffer(block: Sink.() -> Unit): Buffer = Buffer().apply(block)

-public fun Input.readRawString(size: Int): String {
-    return Charsets.ISO_8859_1.newDecoder().decodeExactBytes(this, size)
-}
+//public fun Source.readSafeUtf8Line(): String = readUTF8Line() ?: error("Line not found")

-public fun Input.readUtf8String(): String = readBytes().decodeToString()
+public inline fun ByteArray(block: Sink.() -> Unit): ByteArray =
+    Buffer(block).readByteArray()

-public fun Input.readSafeUtf8Line(): String = readUTF8Line() ?: error("Line not found")
-
-public inline fun ByteArray(block: Output.() -> Unit): ByteArray =
-    buildPacket(block).readBytes()
-
-public inline fun Binary(block: Output.() -> Unit): Binary =
+public inline fun Binary(block: Sink.() -> Unit): Binary =
    ByteArray(block).asBinary()

 public operator fun Binary.get(range: IntRange): Binary = view(range.first, range.last - range.first)

 /**
 * Return inferred [EnvelopeFormat] if only one format could read given file. If no format accepts the binary, return null. If
- * multiple formats accepts binary, throw an error.
+ * multiple formats accept binary, throw an error.
 */
 public fun IOPlugin.peekBinaryEnvelopeFormat(binary: Binary): EnvelopeFormat? {
    val formats = envelopeFormatFactories.mapNotNull { factory ->
@ -56,7 +57,7 @@ public fun IOPlugin.readEnvelope(
    binary: Binary,
    readNonEnvelopes: Boolean = false,
    formatPicker: IOPlugin.(Binary) -> EnvelopeFormat? = IOPlugin::peekBinaryEnvelopeFormat,
-): Envelope = formatPicker(binary)?.readObject(binary) ?: if (readNonEnvelopes) {
+): Envelope = formatPicker(binary)?.readFrom(binary) ?: if (readNonEnvelopes) {
    // if no format accepts file, read it as binary
    Envelope(Meta.EMPTY, binary)
 } else error("Can't infer format for $binary")
@ -96,74 +97,139 @@ private class RingByteArray(
        else -> inputArray.indices.all { inputArray[it] == get(it) }
    }

+    fun contentEquals(byteString: ByteString): Boolean = when {
+        byteString.size != buffer.size -> false
+        size < buffer.size -> false
+        else -> (0 until byteString.size).all { byteString[it] == get(it) }
+    }
+
 }

 private fun RingByteArray.toArray(): ByteArray = ByteArray(size) { get(it) }

 /**
- * Read [Input] into [output] until designated multibyte [separator] and optionally continues until
+ * Read [Source] into [output] until designated multibyte [separator] and optionally continues until
 * the end of the line after it. Throw error if [separator] not found and [atMost] bytes are read.
 * Also fails if [separator] not found until the end of input.
 *
- * Separator itself is not read into Output.
+ * The Separator itself is not read into [Sink].
 *
 * @param errorOnEof if true error is thrown if separator is never encountered
 *
 * @return bytes actually being read, including separator
 */
-public fun Input.readWithSeparatorTo(
-    output: Output,
-    separator: ByteArray,
+public fun Source.readWithSeparatorTo(
+    output: Sink?,
+    separator: ByteString,
    atMost: Int = Int.MAX_VALUE,
    errorOnEof: Boolean = false,
 ): Int {
    var counter = 0
    val rb = RingByteArray(ByteArray(separator.size))
-    takeWhile { buffer ->
-        while (buffer.canRead()) {
-            val byte = buffer.readByte()
+
+    while (!exhausted()) {
+        val byte = readByte()
        counter++
        if (counter >= atMost) error("Maximum number of bytes to be read $atMost reached.")
        rb.push(byte)
        if (rb.contentEquals(separator)) {
            return counter
        } else if (rb.isFull()) {
-                output.writeByte(rb[0])
+            output?.writeByte(rb[0])
        }
    }
-        !endOfInput
-    }
+
    if (errorOnEof) {
        error("Read to the end of input without encountering ${separator.decodeToString()}")
    } else {
        for (i in 1 until rb.size) {
-            output.writeByte(rb[i])
+            output?.writeByte(rb[i])
        }
        counter += (rb.size - 1)
        return counter
    }
 }

-public fun Input.discardLine(): Int {
-    return discardUntilDelimiter('\n'.code.toByte()).also {
-        discard(1)
-    }.toInt() + 1
-}
-
-public fun Input.discardWithSeparator(
-    separator: ByteArray,
+/**
+ * Discard all bytes until [separator] is encountered. Separator is discarded sa well.
+ * Return the total number of bytes read.
+ */
+public fun Source.discardWithSeparator(
+    separator: ByteString,
    atMost: Int = Int.MAX_VALUE,
    errorOnEof: Boolean = false,
-): Int {
-    val dummy: Output = object : Output(ChunkBuffer.Pool) {
-        override fun closeDestination() {
+): Int = readWithSeparatorTo(null, separator, atMost, errorOnEof)
+
+/**
+ * Discard all symbol until newline is discovered. Carriage return is not discarded.
+ */
+public fun Source.discardLine(
+    atMost: Int = Int.MAX_VALUE,
+    errorOnEof: Boolean = false,
+): Int = discardWithSeparator("\n".encodeToByteString(), atMost, errorOnEof)
+
+
+/**
+ * A [Source] based on [ByteArray]
+ */
+internal class ByteArraySource(
+    private val byteArray: ByteArray,
+    private val offset: Int = 0,
+    private val size: Int = byteArray.size - offset,
+) : RawSource {
+
+    init {
+        require(offset >= 0) { "Offset must be positive" }
+        require(offset + size <= byteArray.size) { "End index is ${offset + size}, but the array size is ${byteArray.size}" }
+    }
+
+    private var pointer = offset
+
+    override fun close() {
        // Do nothing
    }

-        override fun flush(source: Memory, offset: Int, length: Int) {
-            // Do nothing
+    override fun readAtMostTo(sink: Buffer, byteCount: Long): Long {
+        if (pointer == offset + size) return -1
+        val byteRead = min(byteCount.toInt(), (size + offset - pointer))
+        sink.write(byteArray, pointer, pointer + byteRead)
+        pointer += byteRead
+        return byteRead.toLong()
    }
 }

-    return readWithSeparatorTo(dummy, separator, atMost, errorOnEof)
+/**
+ * A [Source] based on [String]
+ */
+public class StringSource(
+    public val string: String,
+    public val offset: Int = 0,
+    public val size: Int = string.length - offset,
+) : RawSource {
+
+    private var pointer = offset
+
+    override fun close() {
+        // Do nothing
    }
+
+    override fun readAtMostTo(sink: Buffer, byteCount: Long): Long {
+        if (pointer == offset + size) return -1
+        val byteRead = min(byteCount.toInt(), (size + offset - pointer))
+        sink.writeString(string, pointer, pointer + byteRead)
+        pointer += byteRead
+        return byteRead.toLong()
+    }
+}
+
+public fun Sink.writeDouble(value: Double) {
+    writeLong(value.toBits())
+}
+
+public fun Source.readDouble(): Double = Double.fromBits(readLong())
+
+public fun Sink.writeFloat(value: Float) {
+    writeInt(value.toBits())
+}
+
+public fun Source.readFloat(): Float = Float.fromBits(readInt())
--- a/dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/BinaryTest.kt
+++ b/dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/BinaryTest.kt
@ -1,6 +1,5 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.readInt
 import kotlin.test.Test
 import kotlin.test.assertEquals

--- a/dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/EnvelopeFormatTest.kt
+++ b/dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/EnvelopeFormatTest.kt
@ -1,6 +1,7 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.readBytes
+import kotlinx.io.readByteArray
+import kotlinx.io.writeString
 import kotlin.test.Test
 import kotlin.test.assertEquals

@ -12,7 +13,7 @@ class EnvelopeFormatTest {
            "d" put 22.2
        }
        data {
-            writeUtf8String("12345678")
+            writeString("12345678")
        }
    }

@ -22,7 +23,7 @@ class EnvelopeFormatTest {
        val res = readFromByteArray(byteArray)
        assertEquals(envelope.meta, res.meta)
        val bytes = res.data?.read {
-            readBytes()
+            readByteArray()
        }
        assertEquals("12345678", bytes?.decodeToString())
    }
@ -34,7 +35,7 @@ class EnvelopeFormatTest {
        val res = readFromByteArray(byteArray)
        assertEquals(envelope.meta, res.meta)
        val bytes = res.data?.read {
-            readBytes()
+            readByteArray()
        }
        assertEquals("12345678", bytes?.decodeToString())
    }
@ -56,7 +57,7 @@ class EnvelopeFormatTest {
        val res = TaglessEnvelopeFormat.readFromByteArray(envelopeString.encodeToByteArray())
        assertEquals(envelope.meta, res.meta)
        val bytes = res.data?.read {
-            readBytes()
+            readByteArray()
        }
        assertEquals("12345678", bytes?.decodeToString())
    }
--- a/dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/IOTest.kt
+++ b/dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/IOTest.kt
@ -1,8 +1,9 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.ByteReadPacket
-import io.ktor.utils.io.core.readBytes
-import io.ktor.utils.io.core.readUTF8Line
+import kotlinx.io.buffered
+import kotlinx.io.bytestring.encodeToByteString
+import kotlinx.io.readByteArray
+import kotlinx.io.readLine
 import kotlin.test.Test
 import kotlin.test.assertEquals
 import kotlin.test.assertFails
@ -11,9 +12,9 @@ class IOTest {
    @Test
    fun readBytes() {
        val bytes = ByteArray(8) { it.toByte() }
-        val input = ByteReadPacket(bytes)
-        @Suppress("UNUSED_VARIABLE") val first = input.readBytes(4)
-        val second = input.readBytes(4)
+        val input = ByteArraySource(bytes).buffered()
+        @Suppress("UNUSED_VARIABLE") val first = input.readByteArray(4)
+        val second = input.readByteArray(4)
        assertEquals(4.toByte(), second[0])
    }

@ -31,25 +32,25 @@ class IOTest {

        binary.read {
            val array = ByteArray {
-                val read = readWithSeparatorTo(this, "---".encodeToByteArray()) + discardLine()
+                val read = readWithSeparatorTo(this, "---".encodeToByteString()) + discardLine()
                assertEquals(12, read)
            }
            assertEquals("""
                aaa
                bbb
            """.trimIndent(),array.decodeToString().trim())
-            assertEquals("ccc", readUTF8Line()?.trim())
+            assertEquals("ccc", readLine()?.trim())
        }

        assertFails {
            binary.read {
-                discardWithSeparator("---".encodeToByteArray(), atMost = 3 )
+                discardWithSeparator("---".encodeToByteString(), atMost = 3 )
            }
        }

        assertFails {
            binary.read{
-                discardWithSeparator("-+-".encodeToByteArray(), errorOnEof = true)
+                discardWithSeparator("-+-".encodeToByteString(), errorOnEof = true)
            }
        }

--- a/dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/MetaFormatTest.kt
+++ b/dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/MetaFormatTest.kt
@ -7,11 +7,11 @@ import kotlin.test.assertEquals


 fun Meta.toByteArray(format: MetaFormat = JsonMetaFormat) = ByteArray {
-    format.writeObject(this@ByteArray, this@toByteArray)
+    format.writeTo(this@ByteArray, this@toByteArray)
 }

 fun MetaFormat.fromByteArray(packet: ByteArray): Meta {
-    return packet.asBinary().read { readObject(this) }
+    return packet.asBinary().read { readFrom(this) }
 }

 class MetaFormatTest {
--- a/dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/MultipartTest.kt
+++ b/dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/MultipartTest.kt
@ -1,5 +1,6 @@
 package space.kscience.dataforge.io

+import kotlinx.io.writeString
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.meta.get
 import space.kscience.dataforge.meta.int
@ -18,9 +19,9 @@ class MultipartTest {
                "value" put it
            }
            data {
-                writeUtf8String("Hello World $it")
+                writeString("Hello World $it")
                repeat(300) {
-                    writeRawString("$it ")
+                    writeString("$it ")
                }
            }
        }
--- a/dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/ioTestUtils.kt
+++ b/dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/ioTestUtils.kt
@ -1,12 +1,11 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.ByteReadPacket
-import io.ktor.utils.io.core.use
+import kotlinx.io.buffered


 fun <T : Any> IOFormat<T>.writeToByteArray(obj: T): ByteArray = ByteArray {
-    writeObject(this, obj)
+    writeTo(this, obj)
 }
-fun <T : Any> IOFormat<T>.readFromByteArray(array: ByteArray): T = ByteReadPacket(array).use {
-    readObject(it)
+fun <T : Any> IOFormat<T>.readFromByteArray(array: ByteArray): T = ByteArraySource(array).buffered().use {
+    readFrom(it)
 }
--- a/dataforge-io/src/jvmMain/kotlin/space/kscience/dataforge/io/fileIO.kt
+++ b/dataforge-io/src/jvmMain/kotlin/space/kscience/dataforge/io/fileIO.kt
@ -1,8 +1,11 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.*
-import io.ktor.utils.io.streams.asOutput
+
 import kotlinx.coroutines.runBlocking
+import kotlinx.io.Sink
+import kotlinx.io.Source
+import kotlinx.io.asSink
+import kotlinx.io.buffered
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.meta.isEmpty
@ -23,18 +26,18 @@ internal class PathBinary(
    override val size: Int = Files.size(path).toInt() - fileOffset,
 ) : Binary {

-    override fun <R> read(offset: Int, atMost: Int, block: Input.() -> R): R = runBlocking {
+    override fun <R> read(offset: Int, atMost: Int, block: Source.() -> R): R = runBlocking {
        readSuspend(offset, atMost, block)
    }

-    override suspend fun <R> readSuspend(offset: Int, atMost: Int, block: suspend Input.() -> R): R {
+    override suspend fun <R> readSuspend(offset: Int, atMost: Int, block: suspend Source.() -> R): R {
        val actualOffset = offset + fileOffset
        val actualSize = min(atMost, size - offset)
        val array = path.inputStream().use {
            it.skip(actualOffset.toLong())
            it.readNBytes(actualSize)
        }
-        return ByteReadPacket(array).block()
+        return ByteArraySource(array).buffered().use { it.block() }
    }

    override fun view(offset: Int, binarySize: Int) = PathBinary(path, fileOffset + offset, binarySize)
@ -42,40 +45,40 @@ internal class PathBinary(

 public fun Path.asBinary(): Binary = PathBinary(this)

-public fun <R> Path.read(block: Input.() -> R): R = asBinary().read(block = block)
+public fun <R> Path.read(block: Source.() -> R): R = asBinary().read(block = block)

 /**
 * Write a live output to a newly created file. If file does not exist, throws error
 */
-public fun Path.write(block: Output.() -> Unit): Unit {
+public fun Path.write(block: Sink.() -> Unit): Unit {
    val stream = Files.newOutputStream(this, StandardOpenOption.WRITE, StandardOpenOption.CREATE_NEW)
-    stream.asOutput().use(block)
+    stream.asSink().buffered().use(block)
 }

 /**
 * Create a new file or append to exiting one with given output [block]
 */
-public fun Path.append(block: Output.() -> Unit): Unit {
+public fun Path.append(block: Sink.() -> Unit): Unit {
    val stream = Files.newOutputStream(
        this,
        StandardOpenOption.WRITE, StandardOpenOption.APPEND, StandardOpenOption.CREATE
    )
-    stream.asOutput().use(block)
+    stream.asSink().buffered().use(block)
 }

 /**
 * Create a new file or replace existing one using given output [block]
 */
-public fun Path.rewrite(block: Output.() -> Unit): Unit {
+public fun Path.rewrite(block: Sink.() -> Unit): Unit {
    val stream = Files.newOutputStream(
        this,
        StandardOpenOption.WRITE, StandardOpenOption.TRUNCATE_EXISTING, StandardOpenOption.CREATE
    )
-    stream.asOutput().use(block)
+    stream.asSink().buffered().use(block)
 }

@DFExperimental
-public fun EnvelopeFormat.readFile(path: Path): Envelope = readObject(path.asBinary())
+public fun EnvelopeFormat.readFile(path: Path): Envelope = readFrom(path.asBinary())

 /**
 * Resolve IOFormat based on type
@ -235,7 +238,7 @@ public fun IOPlugin.writeEnvelopeFile(
    envelopeFormat: EnvelopeFormat = TaggedEnvelopeFormat,
 ) {
    path.rewrite {
-        envelopeFormat.writeObject(this, envelope)
+        envelopeFormat.writeTo(this, envelope)
    }
 }

@ -260,7 +263,7 @@ public fun IOPlugin.writeEnvelopeDirectory(
    val dataFile = path.resolve(IOPlugin.DATA_FILE_NAME)
    dataFile.write {
        envelope.data?.read {
-            val copied = copyTo(this@write)
+            val copied = transferTo(this@write)
            if (copied != envelope.data?.size?.toLong()) {
                error("The number of copied bytes does not equal data size")
            }
--- a/dataforge-io/src/jvmMain/kotlin/space/kscience/dataforge/io/resourceIO.kt
+++ b/dataforge-io/src/jvmMain/kotlin/space/kscience/dataforge/io/resourceIO.kt
@ -1,9 +1,11 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.Input
-import io.ktor.utils.io.streams.asInput
+import kotlinx.io.Source
+import kotlinx.io.asSource
+import kotlinx.io.buffered

-public fun IOPlugin.resource(name: String): Binary? = context.javaClass.getResource(name)?.readBytes()?.asBinary()

-public inline fun <R> IOPlugin.readResource(name: String, block: Input.() -> R): R =
-    context.javaClass.getResource(name)?.openStream()?.asInput()?.block() ?: error("Can't read resource $name")
+public fun IOPlugin.resource(name: String): Binary? = { }.javaClass.getResource(name)?.readBytes()?.asBinary()
+
+public inline fun <R> IOPlugin.readResource(name: String, block: Source.() -> R): R =
+    {  }.javaClass.getResource(name)?.openStream()?.asSource()?.buffered()?.block() ?: error("Can't read resource $name")
--- a/dataforge-io/src/jvmTest/kotlin/space/kscience/dataforge/io/FileBinaryTest.kt
+++ b/dataforge-io/src/jvmTest/kotlin/space/kscience/dataforge/io/FileBinaryTest.kt
@ -1,6 +1,5 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.writeDouble
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.misc.DFExperimental
 import java.nio.file.Files
--- a/dataforge-io/src/jvmTest/kotlin/space/kscience/dataforge/io/FileEnvelopeTest.kt
+++ b/dataforge-io/src/jvmTest/kotlin/space/kscience/dataforge/io/FileEnvelopeTest.kt
@ -1,6 +1,5 @@
 package space.kscience.dataforge.io

-import io.ktor.utils.io.core.writeDouble
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.misc.DFExperimental
 import java.nio.file.Files
--- a/dataforge-meta/api/dataforge-meta.api
+++ b/dataforge-meta/api/dataforge-meta.api
@ -45,9 +45,9 @@ public final class space/kscience/dataforge/meta/False : space/kscience/dataforg

 public final class space/kscience/dataforge/meta/JsonMetaKt {
 	public static final fun getJSON_ARRAY_KEY (Lspace/kscience/dataforge/meta/Meta$Companion;)Ljava/lang/String;
-	public static final fun toJson (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lkotlinx/serialization/json/JsonObject;
+	public static final fun toJson (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lkotlinx/serialization/json/JsonElement;
 	public static final fun toJson (Lspace/kscience/dataforge/meta/Value;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lkotlinx/serialization/json/JsonElement;
-	public static synthetic fun toJson$default (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;ILjava/lang/Object;)Lkotlinx/serialization/json/JsonObject;
+	public static synthetic fun toJson$default (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;ILjava/lang/Object;)Lkotlinx/serialization/json/JsonElement;
 	public static synthetic fun toJson$default (Lspace/kscience/dataforge/meta/Value;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;ILjava/lang/Object;)Lkotlinx/serialization/json/JsonElement;
 	public static final fun toMeta (Lkotlinx/serialization/json/JsonElement;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lspace/kscience/dataforge/meta/SealedMeta;
 	public static final fun toMeta (Lkotlinx/serialization/json/JsonObject;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lspace/kscience/dataforge/meta/SealedMeta;
@ -639,17 +639,6 @@ public final class space/kscience/dataforge/meta/ValueType : java/lang/Enum {
 	public static fun values ()[Lspace/kscience/dataforge/meta/ValueType;
 }

-public final class space/kscience/dataforge/meta/ValueType$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
-	public static final field INSTANCE Lspace/kscience/dataforge/meta/ValueType$$serializer;
-	public fun childSerializers ()[Lkotlinx/serialization/KSerializer;
-	public synthetic fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Ljava/lang/Object;
-	public fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Lspace/kscience/dataforge/meta/ValueType;
-	public fun getDescriptor ()Lkotlinx/serialization/descriptors/SerialDescriptor;
-	public synthetic fun serialize (Lkotlinx/serialization/encoding/Encoder;Ljava/lang/Object;)V
-	public fun serialize (Lkotlinx/serialization/encoding/Encoder;Lspace/kscience/dataforge/meta/ValueType;)V
-	public fun typeParametersSerializers ()[Lkotlinx/serialization/KSerializer;
-}
-
 public final class space/kscience/dataforge/meta/ValueType$Companion {
 	public final fun serializer ()Lkotlinx/serialization/KSerializer;
 }
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/Meta.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/Meta.kt
@ -50,7 +50,9 @@ public interface Meta : MetaRepr, MetaProvider {
    override fun toMeta(): Meta = this

    override fun toString(): String
+
    override fun equals(other: Any?): Boolean
+
    override fun hashCode(): Int

    public companion object {
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MutableMeta.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MutableMeta.kt
@ -11,7 +11,7 @@ import kotlin.js.JsName
 * Mark a meta builder
 */
@DslMarker
-public annotation class MetaBuilder
+public annotation class MetaBuilderMarker

 /**
 * A generic interface that gives access to getting and setting meta notes and values
@ -27,7 +27,7 @@ public interface MutableMetaProvider : MetaProvider, MutableValueProvider {
 * TODO documentation
 */
@Serializable(MutableMetaSerializer::class)
-@MetaBuilder
+@MetaBuilderMarker
 public interface MutableMeta : Meta, MutableMetaProvider {

    override val items: Map<NameToken, MutableMeta>
@ -90,8 +90,8 @@ public interface MutableMeta : Meta, MutableMetaProvider {
        setMeta(this, repr.toMeta())
    }

-    public infix fun Name.put(mutableMeta: MutableMeta.() -> Unit) {
-        setMeta(this, Meta(mutableMeta))
+    public infix fun Name.put(builder: MutableMeta.() -> Unit) {
+        getOrCreate(this).apply(builder)
    }

    public infix fun String.put(meta: Meta) {
@ -131,7 +131,7 @@ public interface MutableMeta : Meta, MutableMetaProvider {
    }

    public infix fun String.put(builder: MutableMeta.() -> Unit) {
-        setMeta(Name.parse(this), MutableMeta(builder))
+        getOrCreate(parseAsName()).apply(builder)
    }
 }

@ -381,16 +381,14 @@ public fun Meta.toMutableMeta(): ObservableMutableMeta = MutableMetaImpl(value,

 public fun Meta.asMutableMeta(): MutableMeta = (this as? MutableMeta) ?: toMutableMeta()

-@Suppress("FunctionName")
-@JsName("newMutableMeta")
-public fun MutableMeta(): ObservableMutableMeta = MutableMetaImpl(null)
+@JsName("newObservableMutableMeta")
+public fun ObservableMutableMeta(): ObservableMutableMeta = MutableMetaImpl(null)

 /**
 * Build a [MutableMeta] using given transformation
 */
-@Suppress("FunctionName")
-public inline fun MutableMeta(builder: MutableMeta.() -> Unit = {}): ObservableMutableMeta =
-    MutableMeta().apply(builder)
+public inline fun ObservableMutableMeta(builder: MutableMeta.() -> Unit = {}): ObservableMutableMeta =
+    ObservableMutableMeta().apply(builder)


 /**
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/ObservableMetaWrapper.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/ObservableMetaWrapper.kt
@ -51,6 +51,8 @@ private class ObservableMetaWrapper(

    override fun setMeta(name: Name, node: Meta?) {
        val oldMeta = get(name)
+        //don't forget to remove listener
+        oldMeta?.removeListener(this)
        root.setMeta(absoluteName + name, node)
        if (oldMeta != node) {
            invalidate(name)
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/SealedMeta.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/SealedMeta.kt
@ -1,16 +1,17 @@
 package space.kscience.dataforge.meta

 import kotlinx.serialization.Serializable
-import space.kscience.dataforge.names.NameToken
+import space.kscience.dataforge.names.*
+import kotlin.js.JsName

 /**
 * The meta implementation which is guaranteed to be immutable.
 *
 */
@Serializable
-public class SealedMeta internal constructor(
+public class SealedMeta(
    override val value: Value?,
-    override val items: Map<NameToken, SealedMeta>
+    override val items: Map<NameToken, SealedMeta>,
 ) : TypedMeta<SealedMeta> {
    override fun toString(): String = Meta.toString(this)
    override fun equals(other: Any?): Boolean = Meta.equals(this, other as? Meta)
@ -26,7 +27,7 @@ public class SealedMeta internal constructor(
 }

 /**
- * Generate sealed node from [this]. If it is already sealed return it as is.
+ * Generate sealed node from [this]. If it is already sealed, return it as is.
 */
 public fun Meta.seal(): SealedMeta = this as? SealedMeta ?: SealedMeta(
    value,
@ -47,7 +48,79 @@ public fun Meta(value: String): SealedMeta = Meta(value.asValue())
@Suppress("FunctionName")
 public fun Meta(value: Boolean): SealedMeta = Meta(value.asValue())

-@Suppress("FunctionName")
-public inline fun Meta(builder: MutableMeta.() -> Unit): SealedMeta =
-    MutableMeta(builder).seal()

+/**
+ * A lightweight mutable meta without an observability
+ */
+@PublishedApi
+internal class MetaBuilder(
+    override var value: Value? = null,
+    override val items: MutableMap<NameToken, MetaBuilder> = hashMapOf(),
+) : MutableMeta {
+
+    override fun getOrCreate(name: Name): MetaBuilder {
+        val existing = get(name) as? MetaBuilder
+        return if (existing == null) {
+            val newItem = MetaBuilder()
+            setMeta(name, newItem)
+            newItem
+        } else {
+            existing
+        }
+    }
+
+    private fun wrap(meta: Meta): MetaBuilder = meta as? MetaBuilder ?: MetaBuilder(
+        meta.value,
+        meta.items.mapValuesTo(hashMapOf()) { wrap(it.value) }
+    )
+
+
+    override fun setMeta(name: Name, node: Meta?) {
+        when (name.length) {
+            0 -> error("Can't set a meta with empty name")
+            1 -> {
+                val token = name.first()
+                //remove child and invalidate if argument is null
+                if (node == null) {
+                    items.remove(token)
+                } else {
+                    items[token] = wrap(node)
+                }
+            }
+
+            else -> {
+                getOrCreate(name.first().asName()).setMeta(name.cutFirst(), node)
+            }
+        }
+    }
+
+    override fun toString(): String = Meta.toString(this)
+
+    override fun equals(other: Any?): Boolean = Meta.equals(this, other as? Meta)
+
+    override fun hashCode(): Int = Meta.hashCode(this)
+}
+
+/**
+ * Create a read-only meta.
+ */
+public inline fun Meta(builder: MutableMeta.() -> Unit): Meta =
+    MetaBuilder().apply(builder).seal()
+
+/**
+ * Create an immutable meta.
+ */
+public inline fun SealedMeta(builder: MutableMeta.() -> Unit): SealedMeta =
+    MetaBuilder().apply(builder).seal()
+
+/**
+ * Create an empty meta mutable meta.
+ */
+@JsName("newMutableMeta")
+public fun MutableMeta(): MutableMeta = MetaBuilder()
+
+/**
+ * Create a mutable meta with given builder.
+ */
+public inline fun MutableMeta(builder: MutableMeta.() -> Unit = {}): MutableMeta =
+    MutableMeta().apply(builder)
--- a/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/transformations/MetaTransformation.kt
+++ b/dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/transformations/MetaTransformation.kt
@ -105,7 +105,7 @@ public value class MetaTransformation(private val transformations: Collection<Tr
     * Generate an observable configuration that contains only elements defined by transformation rules and changes with the source
     */
    @DFExperimental
-    public fun generate(source: ObservableMeta): ObservableMeta = MutableMeta().apply {
+    public fun generate(source: ObservableMeta): ObservableMeta = ObservableMutableMeta{
        transformations.forEach { rule ->
            rule.selectItems(source).forEach { name ->
                rule.transformItem(name, source[name], this)
--- a/dataforge-meta/src/jvmTest/kotlin/space/kscience/dataforge/meta/JvmMutableMetaTest.kt
+++ b/dataforge-meta/src/jvmTest/kotlin/space/kscience/dataforge/meta/JvmMutableMetaTest.kt
@ -1,15 +0,0 @@
-package space.kscience.dataforge.meta
-
-import org.junit.jupiter.api.Test
-import kotlin.test.assertFails
-
-class JvmMutableMetaTest {
-    @Test
-    fun recursiveMeta(){
-        val meta = MutableMeta {
-            "a" put 2
-        }
-
-        assertFails { meta["child.a"] = meta }
-    }
-}
--- a/dataforge-workspace/build.gradle.kts
+++ b/dataforge-workspace/build.gradle.kts
@ -10,17 +10,35 @@ kscience{
    useSerialization{
        protobuf()
    }
-    dependencies {
-        api(projects.dataforgeContext)
-        api(projects.dataforgeData)
-        api(projects.dataforgeIo)
-    }
-    dependencies(jvmTest){
-        implementation(spclibs.logback.classic)
-        implementation(projects.dataforgeIo.dataforgeIoYaml)
-    }
+//    dependencies {
+//        api(projects.dataforgeContext)
+//        api(projects.dataforgeData)
+//        api(projects.dataforgeIo)
+//    }
+//    dependencies(jvmTest){
+//        implementation(spclibs.logback.classic)
+//        implementation(projects.dataforgeIo.dataforgeIoYaml)
+//    }
 }

 readme{
    maturity = space.kscience.gradle.Maturity.EXPERIMENTAL
 }
+
+kotlin{
+    sourceSets{
+        commonMain{
+            dependencies {
+                api(projects.dataforgeContext)
+                api(projects.dataforgeData)
+                api(projects.dataforgeIo)
+            }
+        }
+        getByName("jvmTest"){
+            dependencies {
+                implementation(spclibs.logback.classic)
+                implementation(projects.dataforgeIo.dataforgeIoYaml)
+            }
+        }
+    }
+}
--- a/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/taskBuilders.kt
+++ b/dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/taskBuilders.kt
@ -35,7 +35,10 @@ public suspend inline fun <T : Any, reified P : WorkspacePlugin> TaskResultBuild
 ): DataSet<T> {
    require(workspace.context.plugins.contains(plugin)) { "Plugin $plugin is not loaded into $workspace" }
    val taskReference: TaskReference<T> = plugin.selectorBuilder()
-    return workspace.produce(plugin.name + taskReference.taskName, dependencyMeta) as TaskResult<T>
+    val res = workspace.produce(plugin.name + taskReference.taskName, dependencyMeta)
+    //TODO add explicit check after https://youtrack.jetbrains.com/issue/KT-32956
+    @Suppress("UNCHECKED_CAST")
+    return  res as TaskResult<T>
 }

 /**
@ -45,7 +48,7 @@ public suspend inline fun <T : Any, reified P : WorkspacePlugin> TaskResultBuild
 * @param dependencyMeta meta used for selector. The same meta is used for caching. By default, uses [defaultDependencyMeta].
 * @param selectorBuilder a builder of task from the plugin.
 */
-public suspend inline fun <T : Any, reified P : WorkspacePlugin> TaskResultBuilder<*>.from(
+public suspend inline fun <reified T : Any, reified P : WorkspacePlugin> TaskResultBuilder<*>.from(
    pluginFactory: PluginFactory<P>,
    dependencyMeta: Meta = defaultDependencyMeta,
    selectorBuilder: P.() -> TaskReference<T>,
@ -53,7 +56,10 @@ public suspend inline fun <T : Any, reified P : WorkspacePlugin> TaskResultBuild
    val plugin = workspace.context.plugins[pluginFactory]
        ?: error("Plugin ${pluginFactory.tag} not loaded into workspace context")
    val taskReference: TaskReference<T> = plugin.selectorBuilder()
-    return workspace.produce(plugin.name + taskReference.taskName, dependencyMeta) as TaskResult<T>
+    val res = workspace.produce(plugin.name + taskReference.taskName, dependencyMeta)
+    //TODO explicit check after https://youtrack.jetbrains.com/issue/KT-32956
+    @Suppress("UNCHECKED_CAST")
+    return res as TaskResult<T>
 }

 public val TaskResultBuilder<*>.allData: DataSelector<*>
--- a/dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/FileWorkspaceCache.kt
+++ b/dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/FileWorkspaceCache.kt
@ -1,9 +1,6 @@
 package space.kscience.dataforge.workspace

-import io.ktor.utils.io.core.Input
-import io.ktor.utils.io.core.Output
-import io.ktor.utils.io.core.readBytes
-import io.ktor.utils.io.core.writeFully
+import kotlinx.io.*
 import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.KSerializer
 import kotlinx.serialization.json.Json
@ -30,10 +27,10 @@ public class JsonIOFormat<T : Any>(override val type: KType) : IOFormat<T> {
    @Suppress("UNCHECKED_CAST")
    private val serializer: KSerializer<T> = serializer(type) as KSerializer<T>

-    override fun readObject(input: Input): T = Json.decodeFromString(serializer, input.readUtf8String())
+    override fun readFrom(source: Source): T = Json.decodeFromString(serializer, source.readString())

-    override fun writeObject(output: Output, obj: T) {
-        output.writeUtf8String(Json.encodeToString(serializer, obj))
+    override fun writeTo(sink: Sink, obj: T) {
+        sink.writeString(Json.encodeToString(serializer, obj))
    }
 }

@ -43,10 +40,10 @@ public class ProtobufIOFormat<T : Any>(override val type: KType) : IOFormat<T> {
    @Suppress("UNCHECKED_CAST")
    private val serializer: KSerializer<T> = serializer(type) as KSerializer<T>

-    override fun readObject(input: Input): T = ProtoBuf.decodeFromByteArray(serializer, input.readBytes())
+    override fun readFrom(source: Source): T = ProtoBuf.decodeFromByteArray(serializer, source.readByteArray())

-    override fun writeObject(output: Output, obj: T) {
-        output.writeFully(ProtoBuf.encodeToByteArray(serializer, obj))
+    override fun writeTo(sink: Sink, obj: T) {
+        sink.write(ProtoBuf.encodeToByteArray(serializer, obj))
    }
 }

@ -88,7 +85,7 @@ public class FileWorkspaceCache(public val cacheDirectory: Path) : WorkspaceCach
                    val envelope = Envelope {
                        meta = data.meta
                        data {
-                            writeObject(format, result)
+                            writeWith(format, result)
                        }
                    }
                    io.writeEnvelopeFile(path, envelope)
--- a/dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/zipData.kt
+++ b/dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/zipData.kt
@ -1,13 +1,10 @@
 package space.kscience.dataforge.workspace

-import io.ktor.utils.io.streams.asOutput
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 import space.kscience.dataforge.data.DataTree
 import space.kscience.dataforge.data.DataTreeItem
-import space.kscience.dataforge.io.EnvelopeFormat
-import space.kscience.dataforge.io.IOFormat
-import space.kscience.dataforge.io.TaggedEnvelopeFormat
+import space.kscience.dataforge.io.*
 import space.kscience.dataforge.misc.DFExperimental
 import java.nio.file.Files
 import java.nio.file.Path
@ -28,11 +25,15 @@ private suspend fun <T : Any> ZipOutputStream.writeNode(
            val envelope = treeItem.data.toEnvelope(dataFormat)
            val entry = ZipEntry(name)
            putNextEntry(entry)
-            asOutput().run {
-                envelopeFormat.writeObject(this, envelope)
-                flush()
+
+            //TODO remove additional copy
+            val bytes = ByteArray {
+                writeWith(envelopeFormat, envelope)
            }
+            write(bytes)
+
        }
+
        is DataTreeItem.Node -> {
            val entry = ZipEntry("$name/")
            putNextEntry(entry)
--- a/dataforge-workspace/src/jvmTest/kotlin/space/kscience/dataforge/workspace/FileDataTest.kt
+++ b/dataforge-workspace/src/jvmTest/kotlin/space/kscience/dataforge/workspace/FileDataTest.kt
@ -1,12 +1,18 @@
 package space.kscience.dataforge.workspace

-import io.ktor.utils.io.core.Input
-import io.ktor.utils.io.core.Output
 import kotlinx.coroutines.runBlocking
+import kotlinx.coroutines.test.runTest
+import kotlinx.io.Sink
+import kotlinx.io.Source
+import kotlinx.io.readString
+import kotlinx.io.writeString
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.data.*
-import space.kscience.dataforge.io.*
+import space.kscience.dataforge.io.Envelope
+import space.kscience.dataforge.io.IOFormat
+import space.kscience.dataforge.io.io
+import space.kscience.dataforge.io.readEnvelopeFile
 import space.kscience.dataforge.io.yaml.YamlPlugin
 import space.kscience.dataforge.meta.get
 import space.kscience.dataforge.misc.DFExperimental
@ -36,11 +42,11 @@ class FileDataTest {
    object StringIOFormat : IOFormat<String> {
        override val type: KType get() = typeOf<String>()

-        override fun writeObject(output: Output, obj: String) {
-            output.writeUtf8String(obj)
+        override fun writeTo(sink: Sink, obj: String) {
+            sink.writeString(obj)
        }

-        override fun readObject(input: Input): String = input.readUtf8String()
+        override fun readFrom(source: Source): String = source.readString()
    }

    @Test
@ -59,9 +65,9 @@ class FileDataTest {

    @Test
    @DFExperimental
-    fun testZipWriteRead() = with(Global.io) {
+    fun testZipWriteRead() = runTest {
+        with(Global.io) {
            val zip = Files.createTempFile("df_data_node", ".zip")
-        runBlocking {
            dataNode.writeZip(zip, StringIOFormat)
            println(zip.toUri().toString())
            val reconstructed = readDataDirectory(zip) { _, _ -> StringIOFormat }
--- a/gradle.properties
+++ b/gradle.properties
@ -6,4 +6,5 @@ kotlin.mpp.stability.nowarn=true
 kotlin.incremental.js.ir=true
 kotlin.native.ignoreDisabledTargets=true

-toolsVersion=0.14.9-kotlin-1.8.20
+toolsVersion=0.15.0-kotlin-1.9.20-RC
+#kotlin.experimental.tryK2=true
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.3-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
Author	SHA1	Message	Date
Alexander Nozik	706521a6b6	Suppress manual cast warnings in task builders	2023-10-24 10:52:41 +03:00
Alexander Nozik	94000689da	Merge branch 'beta/kotlin-1.9.20' into dev # Conflicts: # CHANGELOG.md # build.gradle.kts # dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/FileWorkspaceCache.kt # dataforge-workspace/src/jvmTest/kotlin/space/kscience/dataforge/workspace/FileDataTest.kt # gradle.properties	2023-10-24 09:04:37 +03:00
Alexander Nozik	851fdda311	Fix memory leak in sealed builder. Fine-grained Meta builders.	2023-10-08 18:21:04 +03:00
Alexander Nozik	cbbcd18df3	Refactor io.	2023-10-08 18:20:23 +03:00
Alexander Nozik	dc2bf5da83	Merge branch 'kotlinx-io' into dev # Conflicts: # dataforge-io/build.gradle.kts # dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/JsonMetaFormat.kt # gradle.properties	2023-10-08 16:55:47 +03:00
Alexander Nozik	f732b85cc5	kotlin 1.9.20	2023-09-16 15:20:31 +03:00
Alexander Nozik	259b882e63	kotlin 1.9.20	2023-09-13 12:19:20 +03:00
Alexander Nozik	526f230300	Merge branch 'kotlinx-io' into beta/kotlin-1.9.20 # Conflicts: # dataforge-io/build.gradle.kts # dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/JsonMetaFormat.kt # gradle.properties	2023-09-13 08:28:43 +03:00
Alexander Nozik	a136db16ff	Refactoring to kotlinx-io complete	2023-07-15 10:49:42 +03:00
Alexander Nozik	a699c36f8e	[WIP] Refactoring to kotlinx-io	2023-07-11 23:03:52 +03:00
Alexander Nozik	2aba1b48dc	[WIP] Refactoring to kotlinx-io	2023-07-10 10:06:39 +03:00