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/*-*- mode: Java; tab-width:8 -*-*/

package io.soluble.pjb.bridge.http;

/*
 * Copyright (C) 2003-2007 Jost Boekemeier
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

import java.io.BufferedInputStream;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;

import io.soluble.pjb.bridge.Util;

/**
 * An output stream which reads data in HTTP chunks.
 *
 * @author jostb
 */

public class ChunkedInputStream extends FilterInputStream {

    /**
     * Maps ASCII to HEX code.
     */
    public static final int[] ASCII_HEX = getAscii();
    private boolean eof = false;

    private static int[] getAscii() {
        int[] ascii = new int[103];
        for (int i = 48; i < 58; i++) {
            ascii[i] = i - 48;
        }
        for (int i = 65; i < 71; i++) {
            ascii[i] = i - 55;
        }
        for (int i = 97; i < 103; i++) {
            ascii[i] = i - 87;
        }
        return ascii;
    }

    /**
     * Create a new chunked input stream
     *
     * @param in The input stream
     */
    public ChunkedInputStream(InputStream in) {
        super(new BufferedInputStream(in));
    }

    private byte[] rn = new byte[2];
    private byte[] remaining;
    private int remainPos, remainLen;

    /**
     * {@inheritDoc}
     */
    @Override
    public int read(byte[] buf, int pos, int len) throws IOException {
        int c, i;
        int count;

        if (len <= 0) return len;
        if (eof) return -1;

        // check remaining
        if (remaining != null) {
            if (len < remainLen) {
                System.arraycopy(remaining, remainPos, buf, pos, len);
                remainPos += len;
                remainLen -= len;
                return len;
            } else {
                System.arraycopy(remaining, remainPos, buf, pos, remainLen);
                remaining = null;
                return remainLen;
            }
        }

        // read next packet
        int packetLen = readPacketLength();
        if (packetLen == 0) eof = true;


        remaining = new byte[packetLen];
        remainLen = 0;
        for (c = 0; (i = in.read(remaining, c, packetLen - c)) > 0; c += i) {
        }
        if ((c != packetLen)) throw new IOException("read chunked");

        for (c = 0; (i = in.read(rn, c, 2 - c)) > 0; c += i) {
        }
        if ((c != 2)) throw new IOException("read \r\n");

        // store remaining
        if (len >= packetLen) {
            count = packetLen;
            System.arraycopy(remaining, 0, buf, pos, packetLen);
            remaining = null;
        } else {
            count = len;
            System.arraycopy(remaining, 0, buf, pos, len);
            remainPos = len;
            remainLen = packetLen - len;
        }
        return count;
    }

    private int readPacketLength() throws IOException {
        int n = 0;
        int c;

        while ((c = in.read()) != '\r') {
            if (c == -1) throw new IllegalStateException("read chunked packet length");
            if (c == 32) continue; // skip white space
            n <<= 4;
            n += ASCII_HEX[c];
        }
        if (in.read() == -1) throw new IOException("read chunked packet length");

        return n;
    }

    private byte[] buf = new byte[Util.BUF_SIZE];

    /**
     * read trailing 0\r\n
     *
     * @throws IOException
     */
    public void eof() throws IOException {
        // consume remaining 0\r\n
        read(buf, 0, buf.length);
    }
}