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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.IOException;

import io.soluble.pjb.bridge.Util;

/**
 * A FastCGI input stream
 *
 * @author jostb
 */
public class FCGIInputStream extends FCGIConnectionInputStream {
    private final IFCGIProcessFactory processFactory;

    /**
     * Create
     *
     * @param processFactory
     */
    public FCGIInputStream(IFCGIProcessFactory processFactory) {
        this.processFactory = processFactory;
    }

    private StringBuffer error;

    public StringBuffer getError() {
        return error;
    }

    public String checkError() {
        return error == null ? null : Util.checkError(error.toString());
    }

    public int read(byte buf[]) throws FCGIConnectionException {
        try {
            return doRead(buf);
        } catch (FCGIConnectionException ex) {
            throw ex;
        } catch (IOException e) {
            throw new FCGIConnectionException(connection, e);
        }
    }

    private byte header[] = new byte[FCGIUtil.FCGI_HEADER_LEN];

    public int doRead(byte buf[]) throws IOException {
        int n, i;
        //assert if(buf.length!=FCGI_BUF_SIZE) throw new IOException("Invalid block size");
        for (n = 0; (i = read(header, n, FCGIUtil.FCGI_HEADER_LEN - n)) > 0; ) n += i;
        if (FCGIUtil.FCGI_HEADER_LEN != n)
            throw new IOException("Protocol error");
        int type = header[1] & 0xFF;
        int contentLength = ((header[4] & 0xFF) << 8) | (header[5] & 0xFF);
        int paddingLength = header[6] & 0xFF;
        switch (type) {
            case FCGIUtil.FCGI_STDERR:
            case FCGIUtil.FCGI_STDOUT: {
                for (n = 0; (i = read(buf, n, contentLength - n)) > 0; ) n += i;
                if (n != contentLength)
                    throw new IOException("Protocol error while reading FCGI data");
                if (type == FCGIUtil.FCGI_STDERR) {
                    String s = new String(buf, 0, n, Util.ASCII);
                    this.processFactory.log(s);
                    contentLength = 0;

                    if (error == null) error = new StringBuffer(s);
                    else error.append(s);
                }
                if (paddingLength > 0) {
                    byte b[] = new byte[paddingLength];
                    for (n = 0; (i = read(b, n, b.length - n)) > 0; ) n += i;
                    if (n != paddingLength)
                        throw new IOException("Protocol error while reading FCGI padding");
                }
                return contentLength;
            }
            case FCGIUtil.FCGI_END_REQUEST: {
                for (n = 0; (i = read(buf, n, contentLength - n)) > 0; ) n += i;
                if (n != contentLength) throw new IOException("Protocol error while reading EOF data");
                if (paddingLength > 0) {
                    n = super.read(buf, 0, paddingLength);
                    if (n != paddingLength) throw new IOException("Protocol error while reading EOF padding");
                }
                return -1;
            }
        }
        throw new IOException("Received unknown type");
    }
}