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using System;
using System.IO;
namespace Org.BouncyCastle.Tls
{
/// <summary>A queue for bytes. This file could be more optimized.</summary>
public sealed class ByteQueue
{
/// <returns>The smallest number which can be written as 2^x which is bigger than i.</returns>
public static int NextTwoPow(int i)
{
/*
* This code is based of a lot of code I found on the Internet which mostly
* referenced a book called "Hacking delight".
*/
i |= i >> 1;
i |= i >> 2;
i |= i >> 4;
i |= i >> 8;
i |= i >> 16;
return i + 1;
}
/// <summary>The buffer where we store our data.</summary>
private byte[] m_databuf;
/// <summary>How many bytes at the beginning of the buffer are skipped.</summary>
private int m_skipped = 0;
/// <summary>How many bytes in the buffer are valid data.</summary>
private int m_available = 0;
private bool m_readOnlyBuf = false;
public ByteQueue()
: this(0)
{
}
public ByteQueue(int capacity)
{
this.m_databuf = capacity == 0 ? TlsUtilities.EmptyBytes : new byte[capacity];
}
public ByteQueue(byte[] buf, int off, int len)
{
this.m_databuf = buf;
this.m_skipped = off;
this.m_available = len;
this.m_readOnlyBuf = true;
}
/// <summary>Add some data to our buffer.</summary>
/// <param name="buf">A byte-array to read data from.</param>
/// <param name="off">How many bytes to skip at the beginning of the array.</param>
/// <param name="len">How many bytes to read from the array.</param>
public void AddData(byte[] buf, int off, int len)
{
if (m_readOnlyBuf)
throw new InvalidOperationException("Cannot add data to read-only buffer");
if (m_available == 0)
{
if (len > m_databuf.Length)
{
int desiredSize = NextTwoPow(len | 256);
m_databuf = new byte[desiredSize];
}
m_skipped = 0;
}
else if ((m_skipped + m_available + len) > m_databuf.Length)
{
int desiredSize = NextTwoPow(m_available + len);
if (desiredSize > m_databuf.Length)
{
byte[] tmp = new byte[desiredSize];
Array.Copy(m_databuf, m_skipped, tmp, 0, m_available);
m_databuf = tmp;
}
else
{
Array.Copy(m_databuf, m_skipped, m_databuf, 0, m_available);
}
m_skipped = 0;
}
Array.Copy(buf, off, m_databuf, m_skipped + m_available, len);
m_available += len;
}
/// <returns>The number of bytes which are available in this buffer.</returns>
public int Available
{
get { return m_available; }
}
/// <summary>Copy some bytes from the beginning of the data to the provided <see cref="Stream"/>.</summary>
/// <param name="output">The <see cref="Stream"/> to copy the bytes to.</param>
/// <param name="length">How many bytes to copy.</param>
public void CopyTo(Stream output, int length)
{
if (length > m_available)
throw new InvalidOperationException("Cannot copy " + length + " bytes, only got " + m_available);
output.Write(m_databuf, m_skipped, length);
}
/// <summary>Read data from the buffer.</summary>
/// <param name="buf">The buffer where the read data will be copied to.</param>
/// <param name="offset">How many bytes to skip at the beginning of buf.</param>
/// <param name="len">How many bytes to read at all.</param>
/// <param name="skip">How many bytes from our data to skip.</param>
public void Read(byte[] buf, int offset, int len, int skip)
{
if ((buf.Length - offset) < len)
{
throw new ArgumentException("Buffer size of " + buf.Length
+ " is too small for a read of " + len + " bytes");
}
if ((m_available - skip) < len)
{
throw new InvalidOperationException("Not enough data to read");
}
Array.Copy(m_databuf, m_skipped + skip, buf, offset, len);
}
/// <summary>Return a <see cref="HandshakeMessageInput"/> over some bytes at the beginning of the data.
/// </summary>
/// <param name="length">How many bytes will be readable.</param>
/// <returns>A <see cref="HandshakeMessageInput"/> over the data.</returns>
internal HandshakeMessageInput ReadHandshakeMessage(int length)
{
if (length > m_available)
throw new InvalidOperationException("Cannot read " + length + " bytes, only got " + m_available);
int position = m_skipped;
m_available -= length;
m_skipped += length;
return new HandshakeMessageInput(m_databuf, position, length);
}
public int ReadInt32()
{
if (m_available < 4)
throw new InvalidOperationException("Not enough data to read");
return TlsUtilities.ReadInt32(m_databuf, m_skipped);
}
/// <summary>Remove some bytes from our data from the beginning.</summary>
/// <param name="i">How many bytes to remove.</param>
public void RemoveData(int i)
{
if (i > m_available)
throw new InvalidOperationException("Cannot remove " + i + " bytes, only got " + m_available);
/*
* Skip the data.
*/
m_available -= i;
m_skipped += i;
}
/// <summary>Remove data from the buffer.</summary>
/// <param name="buf">The buffer where the removed data will be copied to.</param>
/// <param name="off">How many bytes to skip at the beginning of buf.</param>
/// <param name="len">How many bytes to read at all.</param>
/// <param name="skip">How many bytes from our data to skip.</param>
public void RemoveData(byte[] buf, int off, int len, int skip)
{
Read(buf, off, len, skip);
RemoveData(skip + len);
}
public byte[] RemoveData(int len, int skip)
{
byte[] buf = new byte[len];
RemoveData(buf, 0, len, skip);
return buf;
}
public void Shrink()
{
if (m_available == 0)
{
m_databuf = TlsUtilities.EmptyBytes;
m_skipped = 0;
}
else
{
int desiredSize = NextTwoPow(m_available);
if (desiredSize < m_databuf.Length)
{
byte[] tmp = new byte[desiredSize];
Array.Copy(m_databuf, m_skipped, tmp, 0, m_available);
m_databuf = tmp;
m_skipped = 0;
}
}
}
}
}
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