| /* |
| * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package jdk.incubator.http.internal.hpack; |
| |
| import java.nio.ByteBuffer; |
| import java.util.Arrays; |
| |
| // |
| // 0 1 2 3 4 5 6 7 |
| // +---+---+---+---+---+---+---+---+ |
| // | H | String Length (7+) | |
| // +---+---------------------------+ |
| // | String Data (Length octets) | |
| // +-------------------------------+ |
| // |
| final class StringReader { |
| |
| private static final int NEW = 0; |
| private static final int FIRST_BYTE_READ = 1; |
| private static final int LENGTH_READ = 2; |
| private static final int DONE = 4; |
| |
| private final IntegerReader intReader = new IntegerReader(); |
| private final Huffman.Reader huffmanReader = new Huffman.Reader(); |
| private final ISO_8859_1.Reader plainReader = new ISO_8859_1.Reader(); |
| |
| private int state = NEW; |
| |
| private boolean huffman; |
| private int remainingLength; |
| |
| boolean read(ByteBuffer input, Appendable output) { |
| if (state == DONE) { |
| return true; |
| } |
| if (!input.hasRemaining()) { |
| return false; |
| } |
| if (state == NEW) { |
| int p = input.position(); |
| huffman = (input.get(p) & 0b10000000) != 0; |
| state = FIRST_BYTE_READ; |
| intReader.configure(7); |
| } |
| if (state == FIRST_BYTE_READ) { |
| boolean lengthRead = intReader.read(input); |
| if (!lengthRead) { |
| return false; |
| } |
| remainingLength = intReader.get(); |
| state = LENGTH_READ; |
| } |
| if (state == LENGTH_READ) { |
| boolean isLast = input.remaining() >= remainingLength; |
| int oldLimit = input.limit(); |
| if (isLast) { |
| input.limit(input.position() + remainingLength); |
| } |
| remainingLength -= Math.min(input.remaining(), remainingLength); |
| if (huffman) { |
| huffmanReader.read(input, output, isLast); |
| } else { |
| plainReader.read(input, output); |
| } |
| if (isLast) { |
| input.limit(oldLimit); |
| state = DONE; |
| } |
| return isLast; |
| } |
| throw new InternalError(Arrays.toString( |
| new Object[]{state, huffman, remainingLength})); |
| } |
| |
| boolean isHuffmanEncoded() { |
| if (state < FIRST_BYTE_READ) { |
| throw new IllegalStateException("Has not been fully read yet"); |
| } |
| return huffman; |
| } |
| |
| void reset() { |
| if (huffman) { |
| huffmanReader.reset(); |
| } else { |
| plainReader.reset(); |
| } |
| intReader.reset(); |
| state = NEW; |
| } |
| } |