commit ba704f18e5d4bbaf4cfc8c9956c495a62af3a953
Author: Walter Oggioni <oggioni.walter@gmail.com>
Date:   Sun Apr 26 17:00:10 2020 +0100

    initial commit

diff --git a/build.gradle.kts b/build.gradle.kts
new file mode 100644
index 0000000..50b3426
--- /dev/null
+++ b/build.gradle.kts
@@ -0,0 +1,57 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * This generated file contains a sample Kotlin library project to get you started.
+ */
+
+fun property(name : String) = project.property(name).toString()
+
+plugins {
+    // Apply the Kotlin JVM plugin to add support for Kotlin.
+    id("org.jetbrains.kotlin.jvm") version "1.3.70"
+
+    // Apply the java-library plugin for API and implementation separation.
+    `java-library`
+    application
+}
+
+repositories {
+    // Use jcenter for resolving dependencies.
+    // You can declare any Maven/Ivy/file repository here.
+    mavenLocal()
+    jcenter()
+    mavenCentral()
+}
+
+dependencies {
+    // Align versions of all Kotlin components
+    compileOnly(platform("org.jetbrains.kotlin:kotlin-bom"))
+    testImplementation(platform("org.jetbrains.kotlin:kotlin-bom"))
+
+    // Use the Kotlin JDK 8 standard library.
+    compileOnly("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
+    testImplementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
+
+    implementation("net.java.dev.jna", "jna", "5.5.0")
+    
+    // https://mvnrepository.com/artifact/org.projectlombok/lombok
+    compileOnly("org.projectlombok", "lombok", property("lombok.version"))
+    annotationProcessor("org.projectlombok", "lombok", property("lombok.version"))
+
+    testCompileOnly("org.projectlombok", "lombok", property("lombok.version"))
+    testAnnotationProcessor("org.projectlombok", "lombok", property("lombok.version"))
+    testRuntimeOnly("org.junit.jupiter", "junit-jupiter-engine", property("junit.version"))
+    testImplementation("org.junit.jupiter","junit-jupiter-api", property("junit.version"))
+    testImplementation("net.woggioni", "jwo", "1.0")
+
+}
+
+application {
+    mainClassName = "net.woggioni.kzstd.HelloWorld"
+}
+
+
+tasks.withType<Test> {
+    useJUnitPlatform {
+    }
+}
diff --git a/gradle.properties b/gradle.properties
new file mode 100644
index 0000000..1760ac5
--- /dev/null
+++ b/gradle.properties
@@ -0,0 +1,2 @@
+junit.version=5.6.2
+lombok.version=1.18.12
\ No newline at end of file
diff --git a/settings.gradle.kts b/settings.gradle.kts
new file mode 100644
index 0000000..f6cba44
--- /dev/null
+++ b/settings.gradle.kts
@@ -0,0 +1,10 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * The settings file is used to specify which projects to include in your build.
+ *
+ * Detailed information about configuring a multi-project build in Gradle can be found
+ * in the user manual at https://docs.gradle.org/6.3/userguide/multi_project_builds.html
+ */
+
+rootProject.name = "kzstd"
diff --git a/src/main/java/net/woggioni/jzstd/ZSTD_CCtx.java b/src/main/java/net/woggioni/jzstd/ZSTD_CCtx.java
new file mode 100644
index 0000000..cc0da9a
--- /dev/null
+++ b/src/main/java/net/woggioni/jzstd/ZSTD_CCtx.java
@@ -0,0 +1,5 @@
+package net.woggioni.jzstd;
+
+import com.sun.jna.PointerType;
+
+public class ZSTD_CCtx extends PointerType { }
diff --git a/src/main/java/net/woggioni/jzstd/ZSTD_CDict.java b/src/main/java/net/woggioni/jzstd/ZSTD_CDict.java
new file mode 100644
index 0000000..3ba3c9e
--- /dev/null
+++ b/src/main/java/net/woggioni/jzstd/ZSTD_CDict.java
@@ -0,0 +1,5 @@
+package net.woggioni.jzstd;
+
+import com.sun.jna.PointerType;
+
+public class ZSTD_CDict extends PointerType { }
diff --git a/src/main/java/net/woggioni/jzstd/ZSTD_EndDirective.java b/src/main/java/net/woggioni/jzstd/ZSTD_EndDirective.java
new file mode 100644
index 0000000..bee496f
--- /dev/null
+++ b/src/main/java/net/woggioni/jzstd/ZSTD_EndDirective.java
@@ -0,0 +1,12 @@
+package net.woggioni.jzstd;
+
+import lombok.RequiredArgsConstructor;
+
+@RequiredArgsConstructor
+public enum ZSTD_EndDirective {
+    ZSTD_e_continue(0),
+    ZSTD_e_flush(1),
+    ZSTD_e_end(2);
+
+    public final int value;
+}
diff --git a/src/main/java/net/woggioni/jzstd/ZSTD_ResetDirective.java b/src/main/java/net/woggioni/jzstd/ZSTD_ResetDirective.java
new file mode 100644
index 0000000..cb0e909
--- /dev/null
+++ b/src/main/java/net/woggioni/jzstd/ZSTD_ResetDirective.java
@@ -0,0 +1,13 @@
+package net.woggioni.jzstd;
+
+
+import lombok.RequiredArgsConstructor;
+
+@RequiredArgsConstructor
+public enum ZSTD_ResetDirective {
+    ZSTD_reset_session_only(1),
+    ZSTD_reset_parameters(2),
+    ZSTD_reset_session_and_parameters(3);
+
+    public final int value;
+}
diff --git a/src/main/java/net/woggioni/jzstd/ZSTD_bounds.java b/src/main/java/net/woggioni/jzstd/ZSTD_bounds.java
new file mode 100644
index 0000000..85fbaef
--- /dev/null
+++ b/src/main/java/net/woggioni/jzstd/ZSTD_bounds.java
@@ -0,0 +1,14 @@
+package net.woggioni.jzstd;
+
+import com.sun.jna.Structure;
+import net.woggioni.jzstd.internal.size_t;
+
+@Structure.FieldOrder({"error", "lowerBound", "upperBound"})
+public class ZSTD_bounds extends Structure {
+
+    public size_t error;
+    public int lowerBound;
+    public int upperBound;
+
+    public static class ByValue extends ZSTD_bounds implements Structure.ByValue {}
+}
\ No newline at end of file
diff --git a/src/main/java/net/woggioni/jzstd/ZSTD_cParameter.java b/src/main/java/net/woggioni/jzstd/ZSTD_cParameter.java
new file mode 100644
index 0000000..e6d0fa7
--- /dev/null
+++ b/src/main/java/net/woggioni/jzstd/ZSTD_cParameter.java
@@ -0,0 +1,28 @@
+package net.woggioni.jzstd;
+
+import lombok.RequiredArgsConstructor;
+
+@RequiredArgsConstructor
+public enum ZSTD_cParameter {
+    compressionLevel(100),
+    windowLog(101),
+    hashLog(102),
+    chainLog(103),
+    searchLog(104),
+    minMatch(105),
+    targetLength(106),
+    strategy(107),
+    enableLongDistanceMatching(160),
+    ldmHashLog(161),
+    ldmMinMatch(162),
+    ldmBucketSizeLog(163),
+    ldmHashRateLog(164),
+    contentSizeFlag(200),
+    checksumFlag(201),
+    dictIDFlag(202),
+    nbWorkers(400),
+    jobSize(401),
+    overlapLog(402);
+
+    public final int value;
+}
diff --git a/src/main/java/net/woggioni/jzstd/ZstdOutputStream.java b/src/main/java/net/woggioni/jzstd/ZstdOutputStream.java
new file mode 100644
index 0000000..4d5974d
--- /dev/null
+++ b/src/main/java/net/woggioni/jzstd/ZstdOutputStream.java
@@ -0,0 +1,124 @@
+package net.woggioni.jzstd;
+
+import lombok.SneakyThrows;
+import net.woggioni.jzstd.internal.ZSTD_inBuffer;
+import net.woggioni.jzstd.internal.ZSTD_outBuffer;
+import net.woggioni.jzstd.internal.ZstdLibrary;
+import net.woggioni.jzstd.internal.size_t;
+
+import java.io.OutputStream;
+
+public class ZstdOutputStream extends OutputStream {
+    private final OutputStream sink;
+    private final ZSTD_CCtx ctx;
+    private final boolean ctx_owner;
+
+    private final byte[] buffer;
+    private final ZSTD_inBuffer input;
+    private final ZSTD_outBuffer output;
+    private int pos;
+    private ZSTD_EndDirective flag;
+
+    private ZstdOutputStream(OutputStream sink,
+                             ZSTD_CCtx ctx,
+                             boolean ctx_owner,
+                             int bufferSize) {
+        this.sink = sink;
+        this.ctx = ctx;
+        this.ctx_owner = ctx_owner;
+        this.buffer = new byte[bufferSize];
+        this.input = new ZSTD_inBuffer(bufferSize);
+        this.output = new ZSTD_outBuffer(bufferSize);
+        this.pos = 0;
+        this.flag = ZSTD_EndDirective.ZSTD_e_continue;
+    }
+
+    public static ZstdOutputStream from(OutputStream sink,
+                                        ZSTD_CCtx ctx) {
+        return from(sink, ctx, 0x10000);
+    }
+
+    public static ZstdOutputStream from(
+            OutputStream sink,
+            ZSTD_CCtx ctx,
+            int bufferSize) {
+        ZstdLibrary.CCtx_reset(ctx, ZSTD_ResetDirective.ZSTD_reset_session_only);
+        ZstdLibrary.CCtx_refCDict(ctx, null);
+        return new ZstdOutputStream(sink, ctx, false, bufferSize);
+    }
+
+    public static ZstdOutputStream from(OutputStream sink) {
+        return from(sink, 3);
+    }
+
+    public static ZstdOutputStream from(OutputStream sink,
+                                        int compressionLevel) {
+        return from(sink, compressionLevel, 0x1000);
+    }
+
+    public static ZstdOutputStream from(OutputStream sink,
+                                        int compressionLevel,
+                                        int bufferSize) {
+        ZSTD_bounds range = ZstdLibrary.cParam_getBounds(ZSTD_cParameter.compressionLevel);
+        if (compressionLevel < range.lowerBound || compressionLevel > range.upperBound) {
+            throw new IllegalArgumentException("Compression level must be between " +
+                    range.lowerBound + " and " + range.upperBound);
+        }
+        ZSTD_CCtx ctx = ZstdLibrary.ZSTD_createCCtx();
+        ZstdLibrary.CCtx_setParameter(ctx,
+                ZSTD_cParameter.compressionLevel, compressionLevel);
+        return new ZstdOutputStream(sink, ctx, true, bufferSize);
+    }
+
+
+    @Override
+    @SneakyThrows
+    public void flush() {
+        input.src.put(buffer, 0, pos);
+        input.src.position(0);
+        input.pos = new size_t(0);
+        input.size = new size_t(pos);
+        pos = 0;
+        while (true) {
+            size_t rc = ZstdLibrary.compressStream2(ctx, output, input, flag);
+            if (output.pos.longValue() > 0) {
+                output.dst.get(buffer);
+                output.dst.position(0);
+                sink.write(buffer, 0, output.pos.intValue());
+                output.pos = new size_t(0);
+            }
+            if (input.pos.longValue() == input.size.longValue() && flag == ZSTD_EndDirective.ZSTD_e_continue) {
+                break;
+            } else if (flag == ZSTD_EndDirective.ZSTD_e_end && rc.intValue() == 0) {
+                break;
+            }
+        }
+    }
+
+    @Override
+    public void write(int b) {
+        if (pos == buffer.length) flush();
+        buffer[pos++] = (byte) b;
+    }
+
+    @Override
+    public void write(byte[] arr, int off, int len) {
+        var written = 0;
+        while (written < len - off) {
+            int writeSize = Math.min(len, buffer.length - pos);
+            System.arraycopy(arr, off, buffer, pos, writeSize);
+            pos += writeSize;
+            if (pos == buffer.length) flush();
+            written += writeSize;
+        }
+    }
+
+    @Override
+    @SneakyThrows
+    public void close() {
+        flag = ZSTD_EndDirective.ZSTD_e_end;
+        flush();
+        sink.close();
+        if (ctx_owner) ZstdLibrary.ZSTD_freeCCtx(ctx);
+    }
+}
diff --git a/src/main/java/net/woggioni/jzstd/internal/ZSTD_ErrorCode.java b/src/main/java/net/woggioni/jzstd/internal/ZSTD_ErrorCode.java
new file mode 100644
index 0000000..84336cf
--- /dev/null
+++ b/src/main/java/net/woggioni/jzstd/internal/ZSTD_ErrorCode.java
@@ -0,0 +1,32 @@
+package net.woggioni.jzstd.internal;
+
+import lombok.RequiredArgsConstructor;
+
+@RequiredArgsConstructor
+public enum ZSTD_ErrorCode {
+    ZSTD_error_no_error(0),
+    ZSTD_error_GENERIC(1),
+    ZSTD_error_prefix_unknown(10),
+    ZSTD_error_version_unsupported(12),
+    ZSTD_error_frameParameter_unsupported(14),
+    ZSTD_error_frameParameter_windowTooLarge(16),
+    ZSTD_error_corruption_detected(20),
+    ZSTD_error_checksum_wrong(22),
+    ZSTD_error_dictionary_corrupted(30),
+    ZSTD_error_dictionary_wrong(32),
+    ZSTD_error_dictionaryCreation_failed(34),
+    ZSTD_error_parameter_unsupported(40),
+    ZSTD_error_parameter_outOfBound(42),
+    ZSTD_error_tableLog_tooLarge(44),
+    ZSTD_error_maxSymbolValue_tooLarge(46),
+    ZSTD_error_maxSymbolValue_tooSmall(48),
+    ZSTD_error_stage_wrong(60),
+    ZSTD_error_init_missing(62),
+    ZSTD_error_memory_allocation(64),
+    ZSTD_error_workSpace_tooSmall(66),
+    ZSTD_error_dstSize_tooSmall(70),
+    ZSTD_error_srcSize_wrong(72),
+    ZSTD_error_dstBuffer_null(74);
+
+    public final int value;
+}
\ No newline at end of file
diff --git a/src/main/java/net/woggioni/jzstd/internal/ZSTD_inBuffer.java b/src/main/java/net/woggioni/jzstd/internal/ZSTD_inBuffer.java
new file mode 100644
index 0000000..bb2c501
--- /dev/null
+++ b/src/main/java/net/woggioni/jzstd/internal/ZSTD_inBuffer.java
@@ -0,0 +1,19 @@
+package net.woggioni.jzstd.internal;
+
+import com.sun.jna.Structure;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+
+@Structure.FieldOrder(value = {"src", "size", "pos"})
+public class ZSTD_inBuffer extends Structure {
+    public ByteBuffer src;
+    public size_t size;
+    public size_t pos;
+
+    public ZSTD_inBuffer(int size) {
+        this.src = ByteBuffer.allocateDirect(size).order(ByteOrder.nativeOrder());
+        this.size = new size_t(this.src.capacity());
+        this.pos = new size_t(this.src.capacity());
+    }
+}
diff --git a/src/main/java/net/woggioni/jzstd/internal/ZSTD_outBuffer.java b/src/main/java/net/woggioni/jzstd/internal/ZSTD_outBuffer.java
new file mode 100644
index 0000000..1d432d9
--- /dev/null
+++ b/src/main/java/net/woggioni/jzstd/internal/ZSTD_outBuffer.java
@@ -0,0 +1,19 @@
+package net.woggioni.jzstd.internal;
+
+import com.sun.jna.Structure;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+
+@Structure.FieldOrder({"dst", "size", "pos"})
+public class ZSTD_outBuffer extends Structure {
+    public ByteBuffer dst;
+    public size_t size;
+    public size_t pos;
+
+    public ZSTD_outBuffer(int size) {
+        this.dst = ByteBuffer.allocateDirect(size).order(ByteOrder.nativeOrder());
+        this.size = new size_t(dst.capacity());
+        this.pos = new size_t(0);
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/net/woggioni/jzstd/internal/ZstdLibrary.java b/src/main/java/net/woggioni/jzstd/internal/ZstdLibrary.java
new file mode 100644
index 0000000..b17e950
--- /dev/null
+++ b/src/main/java/net/woggioni/jzstd/internal/ZstdLibrary.java
@@ -0,0 +1,82 @@
+package net.woggioni.jzstd.internal;
+
+import com.sun.jna.Native;
+import net.woggioni.jzstd.*;
+
+public class ZstdLibrary {
+
+    public static void checkReturnCode(size_t rc) {
+        if (ZSTD_isError(rc)) {
+            String error = getErrorString(rc);
+            throw new RuntimeException(error);
+        }
+    }
+
+    public static size_t compressStream2(
+            ZSTD_CCtx cctx,
+            ZSTD_outBuffer output,
+            ZSTD_inBuffer input,
+            ZSTD_EndDirective endOp) {
+        size_t rc = ZSTD_compressStream2(cctx, output, input, endOp.value);
+        checkReturnCode(rc);
+        return rc;
+    }
+
+    public static ZSTD_bounds cParam_getBounds(ZSTD_cParameter cParam) {
+        ZSTD_bounds bounds = ZSTD_cParam_getBounds(cParam.value);
+        checkReturnCode(bounds.error);
+        return bounds;
+    }
+
+    public static void CCtx_setParameter(ZSTD_CCtx cctx, ZSTD_cParameter param, int value) {
+        size_t rc = ZSTD_CCtx_setParameter(cctx, param.value, value);
+        if (ZSTD_isError(rc)) {
+            throw new RuntimeException(getErrorString(rc));
+        }
+    }
+
+    public static ZSTD_ErrorCode getErrorCode(size_t functionResult) {
+        int code = ZSTD_getErrorCode(functionResult);
+        for (ZSTD_ErrorCode result : ZSTD_ErrorCode.values()) {
+            if (code == result.value) return result;
+        }
+        throw new IllegalArgumentException("Unknown error code " + code);
+    }
+
+    public static String getErrorString(size_t functionResult) {
+        return ZSTD_getErrorString(getErrorCode(functionResult).value);
+    }
+
+    public static void CCtx_reset(ZSTD_CCtx ctx, ZSTD_ResetDirective resetDirective) {
+        checkReturnCode(ZSTD_CCtx_reset(ctx, resetDirective.value));
+    }
+
+    public static void CCtx_refCDict(ZSTD_CCtx ctx, ZSTD_CDict cdict) {
+        checkReturnCode(ZSTD_CCtx_refCDict(ctx, cdict));
+    }
+
+    public static native size_t ZSTD_CCtx_setParameter(ZSTD_CCtx cctx, int param, int value);
+    public static native ZSTD_CCtx ZSTD_createCCtx();
+    public static native size_t ZSTD_freeCCtx(ZSTD_CCtx cctx);
+    public static native size_t ZSTD_initCStream(ZSTD_CCtx ctx, int compressionLevel);
+
+    public static native ZSTD_CCtx ZSTD_createCStream();
+    public static native void ZSTD_freeCStream(ZSTD_CCtx ctx);
+    public static native size_t ZSTD_compressStream2(
+            ZSTD_CCtx cctx,
+            ZSTD_outBuffer output,
+            ZSTD_inBuffer input,
+            int endOp);
+
+    public static native ZSTD_bounds.ByValue ZSTD_cParam_getBounds(int cParam);
+    public static native boolean ZSTD_isError(size_t code);
+    public static native int ZSTD_getErrorCode(size_t functionResult);
+    public static native String ZSTD_getErrorString(int code);
+
+    public static native size_t ZSTD_CCtx_reset(ZSTD_CCtx ctx, int reset_directive);
+    public static native size_t ZSTD_CCtx_refCDict(ZSTD_CCtx ctx, ZSTD_CDict cdict);
+
+    static {
+        Native.register("zstd");
+    }
+}
diff --git a/src/main/java/net/woggioni/jzstd/internal/size_t.java b/src/main/java/net/woggioni/jzstd/internal/size_t.java
new file mode 100644
index 0000000..9097690
--- /dev/null
+++ b/src/main/java/net/woggioni/jzstd/internal/size_t.java
@@ -0,0 +1,11 @@
+package net.woggioni.jzstd.internal;
+
+import com.sun.jna.IntegerType;
+import com.sun.jna.Native;
+
+public class size_t extends IntegerType {
+    private static final long serialVersionUID = 1L;
+
+    public size_t() { this(0); }
+    public size_t(long value) { super(Native.SIZE_T_SIZE, value); }
+}
\ No newline at end of file
diff --git a/src/main/kotlin/net/woggioni/kzstd/Library.kt b/src/main/kotlin/net/woggioni/kzstd/Library.kt
new file mode 100644
index 0000000..2ce6941
--- /dev/null
+++ b/src/main/kotlin/net/woggioni/kzstd/Library.kt
@@ -0,0 +1,336 @@
+/*
+ * This Kotlin source file was generated by the Gradle 'init' task.
+ */
+package net.woggioni.kzstd
+
+import com.sun.jna.*
+import java.io.BufferedInputStream
+import java.io.InputStream
+import java.io.OutputStream
+import java.lang.IllegalArgumentException
+import java.nio.ByteBuffer
+import java.nio.file.Files
+import java.nio.file.Paths
+import kotlin.math.min
+
+import net.woggioni.jzstd.internal.ZSTD_inBuffer as jZSTD_inBuffer
+import net.woggioni.jzstd.internal.ZSTD_outBuffer as jZSTD_outBuffer
+import net.woggioni.jzstd.ZSTD_CCtx as jZSTD_CCtx
+
+class ZstdInputStream private constructor(
+        private val source: InputStream,
+        private val ctx: ZstdLibrary.ZSTD_CCtx,
+        private val ctx_owner: Boolean,
+        bufferSize: Int) : InputStream() {
+
+    override fun read(): Int {
+        TODO("Not yet implemented")
+    }
+
+    override fun read(b: ByteArray, off: Int, len: Int): Int {
+        return super.read(b, off, len)
+    }
+}
+
+class ZstdOutputStream private constructor(
+        private val sink: OutputStream,
+        private val ctx: ZstdLibrary.ZSTD_CCtx,
+        private val ctx_owner: Boolean,
+        bufferSize: Int) : OutputStream() {
+
+    companion object {
+
+        @JvmStatic
+        @JvmOverloads
+        fun from(sink: OutputStream,
+                 ctx: ZstdLibrary.ZSTD_CCtx,
+                 bufferSize: Int = 0x10000) = let {
+            ZstdLibrary.CCtx_reset(ctx, ZstdLibrary.ZSTD_ResetDirective.ZSTD_reset_session_only)
+            ZstdLibrary.CCtx_refCDict(ctx, null)
+            ZstdOutputStream(sink, ctx, false, bufferSize)
+        }
+
+        @JvmStatic
+        @JvmOverloads
+        fun from(sink: OutputStream,
+                 compressionLevel: Int = 3,
+                 bufferSize: Int = 0x10000) = let {
+            val range = ZstdLibrary.ZSTD_cParam_getBounds(
+                    ZstdLibrary.ZSTD_cParameter.compressionLevel.value)
+            if (compressionLevel < range.lowerBound || compressionLevel > range.upperBound) {
+                throw IllegalArgumentException("Compression level must be between " +
+                        "${range.lowerBound} and ${range.upperBound}")
+            }
+            val ctx = ZstdLibrary.ZSTD_createCCtx()
+            ZstdLibrary.CCtx_setParameter(ctx,
+                    ZstdLibrary.ZSTD_cParameter.compressionLevel, compressionLevel)
+            ZstdOutputStream(sink, ctx, true, bufferSize)
+        }
+    }
+
+    private val buffer = ByteArray(bufferSize)
+    private val input = ZstdLibrary.ZSTD_inBuffer(bufferSize)
+    private val output = ZstdLibrary.ZSTD_outBuffer(bufferSize)
+    private var pos = 0
+    private var flag = ZstdLibrary.ZSTD_EndDirective.ZSTD_e_continue
+
+
+    override fun flush() {
+        input.src.put(buffer, 0, pos)
+        input.src.position(0)
+        input.pos = 0
+        input.size = pos.toLong()
+        pos = 0
+        while (true) {
+            val rc = ZstdLibrary.compressStream2(ctx, output, input, flag)
+            if (output.pos > 0) {
+                output.dst.get(buffer)
+                output.dst.position(0)
+                sink.write(buffer, 0, output.pos.toInt())
+                output.pos = 0
+            }
+            if (input.pos == input.size && flag == ZstdLibrary.ZSTD_EndDirective.ZSTD_e_continue) {
+                break
+            } else if (flag == ZstdLibrary.ZSTD_EndDirective.ZSTD_e_end && rc == 0L) {
+                break
+            }
+        }
+    }
+
+    override fun write(b: Int) {
+        if (pos == buffer.size) flush()
+        buffer[pos++] = b.toByte()
+    }
+
+    override fun write(b: ByteArray, off: Int, len: Int) {
+        var written = 0
+        while (written < len - off) {
+            val writeSize = min(len, buffer.size - pos)
+            System.arraycopy(b, off, buffer, pos, writeSize)
+            pos += writeSize
+            if (pos == buffer.size) flush()
+            written += writeSize
+        }
+    }
+
+    override fun close() {
+        flag = ZstdLibrary.ZSTD_EndDirective.ZSTD_e_end
+        flush()
+        sink.close()
+        if (ctx_owner) ZstdLibrary.ZSTD_freeCCtx(ctx)
+    }
+}
+
+class HelloWorld {
+
+    inline fun <reified T : AutoCloseable, R> withResource(closeable: T, body: (resource: T) -> R): R {
+        return closeable.use {
+            body(it)
+        }
+    }
+
+    private fun checkReturnCode(rc: Long) {
+        if (ZstdLibrary.ZSTD_isError(rc)) {
+            val error = ZstdLibrary.getErrorString(rc)
+            throw RuntimeException(error)
+        }
+    }
+
+    companion object {
+        @JvmStatic
+        fun main(args: Array<String>) {
+
+            BufferedInputStream(HelloWorld::class.java.getResourceAsStream("/Richard_Dawkins_The_Selfish_Gene.pdf")).use { inputStream ->
+                Paths.get("/tmp/Richard_Dawkins_The_Selfish_Gene.pdf.zst").let {
+                    ZstdOutputStream.from(Files.newOutputStream(it))
+                }.use { outputStream ->
+                    val buffer = ByteArray(0x1000)
+                    while (true) {
+                        val read = inputStream.read(buffer)
+                        if (read < 0) break
+                        outputStream.write(buffer, 0, read)
+                    }
+                }
+            }
+        }
+    }
+}
+
+object ZstdLibrary {
+
+    fun checkReturnCode(rc: Long) {
+        if (ZSTD_isError(rc)) {
+            val error = getErrorString(rc)
+            throw RuntimeException(error)
+        }
+    }
+
+    class ZSTD_CCtx : PointerType()
+
+    class ZSTD_CDict : PointerType()
+
+
+    @Structure.FieldOrder(value = ["src", "size", "pos"])
+    class ZSTD_inBuffer(size: Int = 0) : Structure() {
+        @JvmField
+        var src = ByteBuffer.allocateDirect(size)
+
+        @JvmField
+        var size: Long = src.capacity().toLong()
+
+        @JvmField
+        var pos: Long = src.capacity().toLong()
+    }
+
+    @Structure.FieldOrder(value = ["dst", "size", "pos"])
+    class ZSTD_outBuffer(size: Int = 0) : Structure() {
+        @JvmField
+        var dst = ByteBuffer.allocateDirect(size)
+
+        @JvmField
+        var size: Long = dst.capacity().toLong()
+
+        @JvmField
+        var pos: Long = 0
+    }
+
+    @Structure.FieldOrder(value = ["error", "lowerBound", "upperBound"])
+    open class ZSTD_bounds(
+            @JvmField
+            var error: Long = 0,
+            @JvmField
+            var lowerBound: Int = 0,
+            @JvmField
+            var upperBound: Int = 0
+    ) : Structure() {
+        class ByValue : ZSTD_bounds(), Structure.ByValue
+    }
+
+    enum class ZSTD_ResetDirective(@JvmField val value: Int) {
+        ZSTD_reset_session_only(1),
+        ZSTD_reset_parameters(2),
+        ZSTD_reset_session_and_parameters(3)
+    }
+
+    enum class ZSTD_EndDirective(@JvmField val value: Int) {
+        ZSTD_e_continue(0),
+        ZSTD_e_flush(1),
+        ZSTD_e_end(2)
+    }
+
+    enum class ZSTD_cParameter(@JvmField val value: Int) {
+        compressionLevel(100),
+        windowLog(101),
+        hashLog(102),
+        chainLog(103),
+        searchLog(104),
+        minMatch(105),
+        targetLength(106),
+        strategy(107),
+        enableLongDistanceMatching(160),
+        ldmHashLog(161),
+        ldmMinMatch(162),
+        ldmBucketSizeLog(163),
+        ldmHashRateLog(164),
+        contentSizeFlag(200),
+        checksumFlag(201),
+        dictIDFlag(202),
+        nbWorkers(400),
+        jobSize(401),
+        overlapLog(402)
+    }
+
+    enum class ZSTD_ErrorCode(@JvmField val value: Int) {
+        ZSTD_error_no_error(0),
+        ZSTD_error_GENERIC(1),
+        ZSTD_error_prefix_unknown(10),
+        ZSTD_error_version_unsupported(12),
+        ZSTD_error_frameParameter_unsupported(14),
+        ZSTD_error_frameParameter_windowTooLarge(16),
+        ZSTD_error_corruption_detected(20),
+        ZSTD_error_checksum_wrong(22),
+        ZSTD_error_dictionary_corrupted(30),
+        ZSTD_error_dictionary_wrong(32),
+        ZSTD_error_dictionaryCreation_failed(34),
+        ZSTD_error_parameter_unsupported(40),
+        ZSTD_error_parameter_outOfBound(42),
+        ZSTD_error_tableLog_tooLarge(44),
+        ZSTD_error_maxSymbolValue_tooLarge(46),
+        ZSTD_error_maxSymbolValue_tooSmall(48),
+        ZSTD_error_stage_wrong(60),
+        ZSTD_error_init_missing(62),
+        ZSTD_error_memory_allocation(64),
+        ZSTD_error_workSpace_tooSmall(66),
+        ZSTD_error_dstSize_tooSmall(70),
+        ZSTD_error_srcSize_wrong(72),
+        ZSTD_error_dstBuffer_null(74),
+    }
+
+    fun compressStream2(
+            cctx: ZSTD_CCtx,
+            output: ZSTD_outBuffer,
+            input: ZSTD_inBuffer,
+            endOp: ZSTD_EndDirective): Long {
+        val rc = ZSTD_compressStream2(cctx, output, input, endOp.value)
+        checkReturnCode(rc)
+        return rc
+    }
+
+    fun cParam_getBounds(cParam: ZSTD_cParameter): ZSTD_bounds = let {
+        val bounds = ZSTD_cParam_getBounds(cParam.value)
+        if (ZSTD_isError(bounds.error)) throw RuntimeException()
+        bounds
+    }
+
+    fun CCtx_setParameter(cctx: ZSTD_CCtx, param: ZSTD_cParameter, value: Int) {
+        val rc = ZSTD_CCtx_setParameter(cctx, param.value, value)
+        if (ZSTD_isError(rc)) {
+            throw RuntimeException(getErrorString(rc))
+        }
+    }
+
+    fun getErrorCode(functionResult: Long): ZSTD_ErrorCode {
+        val code = ZSTD_getErrorCode(functionResult)
+        for (result in ZSTD_ErrorCode.values()) {
+            if (code == result.value) return result
+        }
+        throw IllegalArgumentException("Unknown error code $code")
+    }
+
+    fun getErrorString(functionResult: Long): String {
+        return ZSTD_getErrorString(getErrorCode(functionResult).value)
+    }
+
+    fun CCtx_reset(ctx: ZSTD_CCtx, resetDirective: ZSTD_ResetDirective) {
+        checkReturnCode(ZSTD_CCtx_reset(ctx, resetDirective.value))
+    }
+
+    fun CCtx_refCDict(ctx: ZSTD_CCtx, cdict: ZSTD_CDict?) {
+        checkReturnCode(ZSTD_CCtx_refCDict(ctx, cdict))
+    }
+
+    external fun ZSTD_CCtx_setParameter(cctx: ZSTD_CCtx, param: Int, value: Int): Long
+    external fun ZSTD_createCCtx(): ZSTD_CCtx
+    external fun ZSTD_freeCCtx(cctx: ZSTD_CCtx): Long
+    external fun ZSTD_initCStream(ctx: ZSTD_CCtx, compressionLevel: Int): Long
+
+    external fun ZSTD_createCStream(): ZSTD_CCtx
+    external fun ZSTD_freeCStream(p: ZSTD_CCtx)
+    external fun ZSTD_compressStream2(
+            cctx: ZSTD_CCtx,
+            output: ZSTD_outBuffer,
+            input: ZSTD_inBuffer,
+            endOp: Int): Long
+
+    external fun ZSTD_cParam_getBounds(cParam: Int): ZSTD_bounds.ByValue
+    external fun ZSTD_isError(code: Long): Boolean
+    external fun ZSTD_getErrorCode(functionResult: Long): Int
+    external fun ZSTD_getErrorString(code: Int): String
+
+    external fun ZSTD_CCtx_reset(ctx: ZSTD_CCtx, reset_directive: Int): Long
+    external fun ZSTD_CCtx_refCDict(ctx: ZSTD_CCtx, cdict: ZSTD_CDict?): Long
+
+    init {
+        Native.register("zstd")
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/net/woggioni/jzstd/SillyTest.java b/src/test/java/net/woggioni/jzstd/SillyTest.java
new file mode 100644
index 0000000..54a3f45
--- /dev/null
+++ b/src/test/java/net/woggioni/jzstd/SillyTest.java
@@ -0,0 +1,61 @@
+package net.woggioni.jzstd;
+
+import lombok.SneakyThrows;
+import net.woggioni.jwo.Chronometer;
+import net.woggioni.jzstd.internal.ZstdLibrary;
+import org.junit.jupiter.api.Test;
+
+import java.io.BufferedInputStream;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+
+public class SillyTest {
+
+    @Test
+    @SneakyThrows
+    public void test() {
+        var ctx = ZstdLibrary.ZSTD_createCCtx();
+        ZstdLibrary.CCtx_setParameter(ctx, ZSTD_cParameter.compressionLevel, 3);
+        try (InputStream is = new BufferedInputStream(
+                getClass().getResourceAsStream("/Richard_Dawkins_The_Selfish_Gene.pdf"))) {
+            try (OutputStream os =
+                         ZstdOutputStream.from(
+                                 Files.newOutputStream(
+                                         Paths.get("/tmp/Richard_Dawkins_The_Selfish_Gene.pdf.zst")))) {
+                byte[] buffer = new byte[0x1000];
+                while (true) {
+                    int read = is.read(buffer);
+                    if (read < 0) break;
+                    os.write(buffer, 0, read);
+                }
+            }
+        }
+    }
+
+    @Test
+    @SneakyThrows
+    public void test4() {
+        Chronometer chronometer = new Chronometer();
+        Path file = Paths.get("/tmp/citylots.json");
+        Path destination = file.getParent().resolve(file.getFileName().toString() + ".zst");
+        try (InputStream is = new BufferedInputStream(Files.newInputStream(file))) {
+            try (OutputStream os =
+                         ZstdOutputStream.from(
+                                 Files.newOutputStream(destination), 11)) {
+                chronometer.reset();
+                byte[] buffer = new byte[0x1000];
+                while (true) {
+                    int read = is.read(buffer);
+                    if (read < 0) break;
+                    os.write(buffer, 0, read);
+                }
+            }
+        }
+        System.out.println(
+            String.format("Elapsed time: %.3f s", chronometer.elapsed(Chronometer.UnitOfMeasure.SECONDS)));
+    }
+}
diff --git a/src/test/kotlin/net/woggioni/kstd/SillyTest.kt b/src/test/kotlin/net/woggioni/kstd/SillyTest.kt
new file mode 100644
index 0000000..237fac1
--- /dev/null
+++ b/src/test/kotlin/net/woggioni/kstd/SillyTest.kt
@@ -0,0 +1,58 @@
+package net.woggioni.kstd
+
+import lombok.SneakyThrows
+import net.woggioni.kzstd.ZstdLibrary
+import net.woggioni.kzstd.ZstdOutputStream
+import org.junit.jupiter.api.Test
+import java.io.BufferedInputStream
+import java.nio.file.Files
+import java.nio.file.Paths
+
+import net.woggioni.jzstd.internal.ZstdLibrary as jZstdLibrary
+import net.woggioni.jzstd.ZSTD_CCtx
+import net.woggioni.jzstd.internal.size_t
+import net.woggioni.jzstd.internal.ZSTD_outBuffer as jZSTD_outBuffer
+import net.woggioni.jzstd.internal.ZSTD_inBuffer as jZSTD_inBuffer
+
+class SillyTest {
+    @Test
+    @SneakyThrows
+    fun test() {
+        BufferedInputStream(
+                javaClass.getResourceAsStream("/Richard_Dawkins_The_Selfish_Gene.pdf")).use { inputstream ->
+            ZstdOutputStream.from(
+                    Files.newOutputStream(
+                            Paths.get("/tmp/Richard_Dawkins_The_Selfish_Gene.pdf.zst"))).use { outputStream ->
+                val buffer = ByteArray(0x1000)
+                while (true) {
+                    val read: Int = inputstream.read(buffer)
+                    if (read < 0) break
+                    outputStream.write(buffer, 0, read)
+                }
+            }
+        }
+    }
+
+
+    @Test
+    fun test2() {
+        val ctx = ZstdLibrary.ZSTD_createCCtx()
+        ZstdLibrary.CCtx_setParameter(ctx, ZstdLibrary.ZSTD_cParameter.compressionLevel, 3)
+        val input = ZstdLibrary.ZSTD_inBuffer(0x1000)
+        input.pos = 0
+        val output = ZstdLibrary.ZSTD_outBuffer(0x1000)
+        ZstdLibrary.compressStream2(ctx, output, input, ZstdLibrary.ZSTD_EndDirective.ZSTD_e_continue)
+        ZstdLibrary.ZSTD_freeCCtx(ctx)
+    }
+
+    @Test
+    fun test3() {
+        val ctx = jZstdLibrary.ZSTD_createCCtx()
+//        jZstdLibrary.CCtx_setParameter(ctx, ZstdLibrary.ZSTD_cParameter.compressionLevel, 3)
+        val input = jZSTD_inBuffer(0x1000)
+        input.pos = size_t(0)
+        val output = jZSTD_outBuffer(0x1000)
+//        ZstdLibrary.ZSTD_compressStream2(ctx, output, input, ZstdLibrary.ZSTD_EndDirective.ZSTD_e_continue.value)
+        jZstdLibrary.ZSTD_freeCCtx(ctx)
+    }
+}
\ No newline at end of file
diff --git a/src/test/resources/index.html b/src/test/resources/index.html
new file mode 100644
index 0000000..e69de29