Add an async parser for HTTP/2. Will continue improving it. Although …

…it looks rather scary for GC, it actually seems to perform "ok" with h2load.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1823578 13f79535-47bb-0310-9956-ffa450edef68

java/org/apache/coyote/http2/ByteUtil.java

@@ -16,6 +16,8 @@
  */
 package org.apache.coyote.http2;
 
+import java.nio.ByteBuffer;
+
 /**
  * Utility class for extracting values from byte arrays.
  */
@@ -37,6 +39,12 @@ static int get31Bits(byte[] input, int firstByte) {
     }
 
 
+    static int get31Bits(ByteBuffer input, int firstByte) {
+        return ((input.get(firstByte) & 0x7F) << 24) + ((input.get(firstByte + 1) & 0xFF) << 16) +
+                ((input.get(firstByte + 2) & 0xFF) << 8) + (input.get(firstByte + 3) & 0xFF);
+    }
+
+
     static void set31Bits(byte[] output, int firstByte, int value) {
         output[firstByte] = (byte) ((value & 0x7F000000) >> 24);
         output[firstByte + 1] = (byte) ((value & 0xFF0000) >> 16);
@@ -50,6 +58,11 @@ static int getOneByte(byte[] input, int pos) {
     }
 
 
+    static int getOneByte(ByteBuffer input, int pos) {
+        return (input.get(pos) & 0xFF);
+    }
+
+
     static int getTwoBytes(byte[] input, int firstByte) {
         return ((input[firstByte] & 0xFF) << 8) +  (input[firstByte + 1] & 0xFF);
     }
@@ -61,6 +74,12 @@ static int getThreeBytes(byte[] input, int firstByte) {
     }
 
 
+    static int getThreeBytes(ByteBuffer input, int firstByte) {
+        return ((input.get(firstByte) & 0xFF) << 16) + ((input.get(firstByte + 1) & 0xFF) << 8) +
+                (input.get(firstByte + 2) & 0xFF);
+    }
+
+
     static void setTwoBytes(byte[] output, int firstByte, int value) {
         output[firstByte] = (byte) ((value & 0xFF00) >> 8);
         output[firstByte + 1] = (byte) (value & 0xFF);