added cli tool

src/main/java/net/woggioni/jzstd/ZstdOutputStream.java

@@ -87,7 +87,7 @@ public class ZstdOutputStream extends OutputStream {
 
     @Override
     public void write(byte[] arr, int off, int len) {
-        var written = 0;
+        int written = 0;
         while (written < len - off) {
             int writeSize = Math.min(len, input.src.capacity() - input.src.position());
             input.src.put(arr, off, writeSize);

src/test/java/net/woggioni/jzstd/BasicTest.java

@@ -2,6 +2,7 @@ package net.woggioni.jzstd;
 
 import lombok.SneakyThrows;
 import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtensionContext;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
@@ -10,9 +11,9 @@ import org.junit.jupiter.params.provider.ArgumentsSource;
 
 import java.io.*;
 import java.nio.file.Files;
+import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.security.DigestInputStream;
-import java.security.DigestOutputStream;
 import java.security.MessageDigest;
 import java.util.stream.Stream;
 
@@ -38,9 +39,9 @@ public class BasicTest {
         MessageDigest md5 = MessageDigest.getInstance("MD5");
 
         ByteArrayInputStream compressedStream;
-        try (InputStream is = new BufferedInputStream(testStream)) {
+        try (InputStream is = new DigestInputStream(new BufferedInputStream(testStream), md5)) {
             ByteArrayOutputStream baos = new ByteArrayOutputStream();
-            try (OutputStream os = new DigestOutputStream(ZstdOutputStream.from(baos), md5)) {
+            try (OutputStream os = ZstdOutputStream.from(baos)) {
                 byte[] buffer = new byte[0x1000];
                 while (true) {
                     int read = is.read(buffer);
@@ -54,12 +55,29 @@ public class BasicTest {
         md5.reset();
         try (InputStream is = new DigestInputStream(
                 ZstdInputStream.from(compressedStream), md5)) {
-            byte [] buffer = new byte[0x10000];
+            byte [] buffer = new byte[0x100000];
             while(true) {
                 int read = is.read(buffer);
                 if(read < 0) break;
             }
         }
-        Assertions.assertArrayEquals(originalDigest, md5.digest());
+        byte[] roundTripDigest = md5.digest();
+        Assertions.assertArrayEquals(originalDigest, roundTripDigest);
+    }
+
+    @SneakyThrows
+    @Test
+    public void test2() {
+        Path inputFile = Paths.get("/tmp/Richard_Dawkins_The_Selfish_Gene.pdf");
+        try(InputStream is = Files.newInputStream(inputFile)) {
+            try(OutputStream os = ZstdOutputStream.from(Files.newOutputStream(Paths.get("/tmp/Richard_Dawkins_The_Selfish_Gene.pdf.zst")))) {
+                byte[] buffer = new byte[0x10000];
+                while(true) {
+                    int read = is.read(buffer);
+                    if(read < 0) break;
+                    os.write(buffer, 0, read);
+                }
+            }
+        }
     }
 }