com.taobao.arthas.grpcweb.proxy.MessageFramer Maven / Gradle / Ivy
/*
* Copyright 2020 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.taobao.arthas.grpcweb.proxy;
/**
* Creates frames from the input bytes.
*/
public class MessageFramer {
public enum Type {
DATA ((byte) 0x00),
TRAILER ((byte) 0x80);
public final byte value;
Type(byte b) {
value = b;
}
}
// TODO: handle more than single frame; i.e., input byte array size > (2GB - 1)
public byte[] getPrefix(byte[] in, Type type) {
int len = in.length;
return new byte[] {
type.value,
(byte) ((len >> 24) & 0xff),
(byte) ((len >> 16) & 0xff),
(byte) ((len >> 8) & 0xff),
(byte) ((len >> 0) & 0xff),
};
}
}