simplify usage of InputStream

Author: osiegmar

example/src/main/java/example/ExampleCsvCompression.java

@@ -2,12 +2,10 @@
 
 import static java.nio.charset.StandardCharsets.UTF_8;
 
-import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
 import java.io.IOException;
-import java.io.InputStreamReader;
+import java.io.InputStream;
 import java.io.OutputStreamWriter;
-import java.io.Reader;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.zip.GZIPInputStream;
@@ -51,10 +49,8 @@ private static void readCsvGzipped(final Path file) throws IOException {
         }
     }
 
-    private static Reader gzipReader(final Path file) throws IOException {
-        final var bufIn = new BufferedInputStream(Files.newInputStream(file));
-        final var gzipIn = new GZIPInputStream(bufIn);
-        return new InputStreamReader(gzipIn, UTF_8);
+    private static InputStream gzipReader(final Path file) throws IOException {
+        return new GZIPInputStream(Files.newInputStream(file));
     }
 
 }

example/src/main/java/example/ExampleCsvReaderWithClasspathInput.java

@@ -2,9 +2,7 @@
 
 import java.io.FileNotFoundException;
 import java.io.IOException;
-import java.io.InputStreamReader;
-import java.io.Reader;
-import java.nio.charset.StandardCharsets;
+import java.io.InputStream;
 
 import de.siegmar.fastcsv.reader.CsvReader;
 import de.siegmar.fastcsv.reader.CsvRecord;
@@ -18,12 +16,12 @@ public static void main(final String[] args) throws IOException {
         }
     }
 
-    static Reader readFromClasspath(final String name) throws FileNotFoundException {
+    static InputStream readFromClasspath(final String name) throws FileNotFoundException {
         final var in = ExampleCsvReaderWithClasspathInput.class.getResourceAsStream(name);
         if (in == null) {
             throw new FileNotFoundException("Resource not found on classpath: " + name);
         }
-        return new InputStreamReader(in, StandardCharsets.UTF_8);
+        return in;
     }
 
 }