Example usage for java.io PushbackInputStream read

Introduction

In this page you can find the example usage for java.io PushbackInputStream read.

Prototype

public int read(byte[] b, int off, int len) throws IOException 

Source Link

Document

Reads up to len bytes of data from this input stream into an array of bytes.

Usage

From source file:org.openymsg.network.HTTPConnectionHandler.java

/**
 * The only time Yahoo can actually send us any packets is when we send it some. Yahoo encodes its packets in a POST
 * body - the format is the same binary representation used for direct connections (with one or two extra codes).
 * //from www . jav a2s.c  o m
 * After posting a packet, the connection will receive a HTTP response who's payload consists of four bytes followed
 * by zero or more packets. The first byte of the four is a count of packets encoded in the following body.
 * 
 * Each incoming packet is transfered to a queue, where receivePacket() takes them off - thus preserving the effect
 * that input and output packets are being received independently, as with other connection handlers. As
 * readPacket() can throw an exception, these are caught and transfered onto the queue too, then rethrown by
 * receivePacket() .
 */
@Override
synchronized void sendPacket(PacketBodyBuffer body, ServiceType service, long status, long sessionID)
        throws IOException, IllegalStateException {
    if (!connected)
        throw new IllegalStateException("Not logged in");

    if (filterOutput(body, service))
        return;
    byte[] b = body.getBuffer();

    Socket soc = new Socket(proxyHost, proxyPort);
    PushbackInputStream pbis = new PushbackInputStream(soc.getInputStream());
    DataOutputStream dos = new DataOutputStream(soc.getOutputStream());

    // HTTP header
    dos.writeBytes(HTTP_HEADER_POST);
    dos.writeBytes("Content-length: " + (b.length + NetworkConstants.YMSG9_HEADER_SIZE) + NetworkConstants.END);
    dos.writeBytes(HTTP_HEADER_AGENT);
    dos.writeBytes(HTTP_HEADER_HOST);
    if (HTTP_HEADER_PROXY_AUTH != null)
        dos.writeBytes(HTTP_HEADER_PROXY_AUTH);
    if (cookie != null)
        dos.writeBytes("Cookie: " + cookie + NetworkConstants.END);
    dos.writeBytes(NetworkConstants.END);
    // YMSG9 header
    dos.write(NetworkConstants.MAGIC, 0, 4);
    dos.write(NetworkConstants.VERSION_HTTP, 0, 4);
    dos.writeShort(b.length & 0xffff);
    dos.writeShort(service.getValue() & 0xffff);
    dos.writeInt((int) (status & 0xffffffff));
    dos.writeInt((int) (sessionID & 0xffffffff));
    // YMSG9 body
    dos.write(b, 0, b.length);
    dos.flush();

    // HTTP response header
    String s = readLine(pbis);
    if (s == null || s.indexOf(" 200 ") < 0) // Not "HTTP/1.0 200 OK"
    {
        throw new IOException("HTTP request returned didn't return OK (200): " + s);
    }
    while (s != null && s.trim().length() > 0)
        // Read past header
        s = readLine(pbis);
    // Payload count
    byte[] code = new byte[4];
    int res = pbis.read(code, 0, 4); // Packet count (Little-Endian?)
    if (res < 4) {
        throw new IOException("Premature end of HTTP data");
    }
    int count = code[0];
    // Payload body
    YMSG9InputStream yip = new YMSG9InputStream(pbis);
    YMSG9Packet pkt;
    for (int i = 0; i < count; i++) {
        pkt = yip.readPacket();
        if (!filterInput(pkt)) {
            if (!packets.add(pkt)) {
                throw new IllegalArgumentException("Unable to add data to the packetQueue!");
            }
        }
    }

    soc.close();

    // Reset idle timeout
    lastFetch = System.currentTimeMillis();
}

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