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/*
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* Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.net.http;
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import java.io.IOException;
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import java.nio.ByteBuffer;
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class SettingsFrame extends Http2Frame {
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int[] parameters;
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public static final int TYPE = 0x4;
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// Flags
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public static final int ACK = 0x1;
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@Override
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String flagAsString(int flag) {
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switch (flag) {
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case ACK:
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return "ACK";
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}
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return super.flagAsString(flag);
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}
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@Override
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public String toString() {
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StringBuilder sb = new StringBuilder();
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sb.append(super.toString())
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.append(" Settings: ");
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for (int i = 0; i < MAX_PARAM; i++) {
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if (parameters[i] != -1) {
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sb.append(name(i))
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.append("=")
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.append(Integer.toString(parameters[i]))
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.append(' ');
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}
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}
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return sb.toString();
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}
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// Parameters
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public static final int HEADER_TABLE_SIZE = 0x1;
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public static final int ENABLE_PUSH = 0x2;
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public static final int MAX_CONCURRENT_STREAMS = 0x3;
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public static final int INITIAL_WINDOW_SIZE = 0x4;
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public static final int MAX_FRAME_SIZE = 0x5;
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public static final int MAX_HEADER_LIST_SIZE = 0x6;
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private String name(int i) {
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switch (i+1) {
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case HEADER_TABLE_SIZE:
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return "HEADER_TABLE_SIZE";
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case ENABLE_PUSH:
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return "ENABLE_PUSH";
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case MAX_CONCURRENT_STREAMS:
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return "MAX_CONCURRENT_STREAMS";
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case INITIAL_WINDOW_SIZE:
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return "INITIAL_WINDOW_SIZE";
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case MAX_FRAME_SIZE:
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return "MAX_FRAME_SIZE";
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case MAX_HEADER_LIST_SIZE:
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return "MAX_HEADER_LIST_SIZE";
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}
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return "unknown parameter";
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}
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public static final int MAX_PARAM = 0x6;
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public SettingsFrame() {
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type = TYPE;
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parameters = new int [MAX_PARAM];
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for (int i=0; i < parameters.length; i++) {
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parameters[i] = -1;
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}
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}
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public int getParameter(int paramID) {
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if (paramID > MAX_PARAM) {
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throw new IllegalArgumentException("illegal parameter");
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}
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return parameters[paramID-1];
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}
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public SettingsFrame setParameter(int paramID, int value) {
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if (paramID > MAX_PARAM) {
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throw new IllegalArgumentException("illegal parameter");
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}
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parameters[paramID-1] = value;
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return this;
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}
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@Override
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void readIncomingImpl(ByteBufferConsumer bc) throws IOException {
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if (length % 6 != 0) {
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throw new IOException("Protocol error: invalid settings frame");
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}
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int n = length / 6;
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for (int i=0; i<n; i++) {
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int id = bc.getShort();
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int val = bc.getInt();
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if (id > 0 || id <= MAX_PARAM) {
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// a known parameter. Ignore otherwise
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parameters[id-1] = val;
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}
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}
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}
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@Override
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void computeLength() {
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length = 0;
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for (int i : parameters) {
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if (i != -1) {
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length += 6;
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}
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}
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}
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@Override
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void writeOutgoing(ByteBufferGenerator bg) {
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super.writeOutgoing(bg);
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ByteBuffer buf = bg.getBuffer(length);
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for (int i = 0; i < MAX_PARAM; i++) {
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if (parameters[i] != -1) {
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buf.putShort((short)(i+1));
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buf.putInt(parameters[i]);
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}
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}
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}
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private static final int K = 1024;
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public static SettingsFrame getDefaultSettings() {
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SettingsFrame f = new SettingsFrame();
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// TODO: check these values
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f.setParameter(ENABLE_PUSH, 1);
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f.setParameter(HEADER_TABLE_SIZE, 4 * K);
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f.setParameter(MAX_CONCURRENT_STREAMS, 35);
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f.setParameter(INITIAL_WINDOW_SIZE, 16 * K);
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f.setParameter(MAX_FRAME_SIZE, 16 * K);
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return f;
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}
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}
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