add http encoding utility

pom.xml

@@ -18,6 +18,14 @@ cobbzilla-utils is available under the Apache License, version 2: http://www.apa
     <version>1.0.0-SNAPSHOT</version>
     <packaging>jar</packaging>
 
+    <repositories>
+        <repository>
+            <id>bintray-nitram509-jbrotli</id>
+            <name>bintray</name>
+            <url>http://dl.bintray.com/nitram509/jbrotli</url>
+        </repository>
+    </repositories>
+
     <licenses>
         <license>
             <name>The Apache Software License, Version 2.0</name>
@@ -163,6 +171,11 @@ cobbzilla-utils is available under the Apache License, version 2: http://www.apa
             <artifactId>commons-compress</artifactId>
             <version>${commons-compress.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.meteogroup.jbrotli</groupId>
+            <artifactId>jbrotli</artifactId>
+            <version>0.5.0</version>
+        </dependency>
 
         <dependency>
             <groupId>org.apache.commons</groupId>

src/main/java/org/cobbzilla/util/http/HttpContentEncodingType.java

@@ -0,0 +1,58 @@
+package org.cobbzilla.util.http;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import lombok.AllArgsConstructor;
+import org.cobbzilla.util.io.FilterInputStreamViaOutputStream;
+import org.meteogroup.jbrotli.io.BrotliInputStream;
+import org.meteogroup.jbrotli.io.BrotliOutputStream;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.zip.*;
+
+@AllArgsConstructor
+public enum HttpContentEncodingType {
+
+    gzip (GZIPInputStream::new, GZIPOutputStream::new, GZIPOutputStream.class),
+
+    deflate (in -> new InflaterInputStream(in, new Inflater(true)),
+             out -> new DeflaterOutputStream(out, new Deflater(7, true)),
+             in -> new FilterInputStreamViaOutputStream(in, out -> new InflaterOutputStream(out, new Inflater(true)))),
+
+    br (BrotliInputStream::new, BrotliOutputStream::new, BrotliOutputStream.class),
+    bro (BrotliInputStream::new, BrotliOutputStream::new, BrotliOutputStream.class);
+
+    private final HttpContentEncodingInputWrapper inputWrapper;
+    private final HttpContentEncodingOutputWrapper outputWrapper;
+    private final HttpContentEncodingInputAsOutputWrapper inputAsOutputWrapper;
+
+    HttpContentEncodingType (HttpContentEncodingInputWrapper inWrap,
+                             HttpContentEncodingOutputWrapper outWrap,
+                             Class<? extends OutputStream> inAsOutClass) {
+        this.inputWrapper = inWrap;
+        this.outputWrapper = outWrap;
+        this.inputAsOutputWrapper = in -> new FilterInputStreamViaOutputStream(in, inAsOutClass);
+    }
+
+    @JsonCreator public static HttpContentEncodingType fromString (String v) { return valueOf(v.toLowerCase()); }
+
+    public InputStream wrapInput(InputStream in) throws IOException { return inputWrapper.wrap(in); }
+
+    public OutputStream wrapOutput(OutputStream out) throws IOException { return outputWrapper.wrap(out); }
+
+    public FilterInputStreamViaOutputStream wrapInputAsOutput(InputStream in) throws IOException { return inputAsOutputWrapper.wrap(in); }
+
+    public interface HttpContentEncodingInputWrapper {
+        InputStream wrap(InputStream in) throws IOException;
+    }
+
+    public interface HttpContentEncodingOutputWrapper {
+        OutputStream wrap(OutputStream out) throws IOException;
+    }
+
+    public interface HttpContentEncodingInputAsOutputWrapper {
+        FilterInputStreamViaOutputStream wrap(InputStream in) throws IOException;
+    }
+
+}