Byte Buffer Stack : Buffer « File « Android

Byte Buffer Stack

 
/**
 * Copyright (C) 2009 Michael A. MacDonald
 */
package com.antlersoft.util;

/**
 * @author Michael A. MacDonald
 *
 */
public class ByteBufferStack {
  private byte[] m_buffer;
  private int[] m_offsets;
  private int m_depth;
  private int m_max_depth;
  private int m_max_size;
  
  public static final int MAX_DEPTH = 20;
  public static final int MAX_SIZE = 1048;
  public ByteBufferStack(int maxDepth, int maxSize)
  {
    m_depth = 0;
    m_max_depth = maxDepth;
    m_max_size = maxSize;
    m_offsets= new int[maxDepth];
    m_buffer = new byte[maxSize];
  }
  
  public ByteBufferStack()
  {
    this(MAX_DEPTH, MAX_SIZE);
  }
  
  /**
   * 
   * @return Start of the buffer; this value is valid at least until the next call of reserve()
   */
  public byte[] getBuffer()
  {
    return m_buffer;
  }
  /**
   * 
   * @return Offset in getBuffer() of last reserved region
   */
  public int getOffset()
  {
    return m_offsets[m_depth];
  }
  
  public int reserve(int count)
  {
    if (count < 0 || (count + m_max_size < 0))
      throw new IllegalArgumentException("Count must by greater than 0");
    if (m_depth == m_max_depth)
    {
      m_max_depth *= 2;
      int[] new_offsets = new int[m_max_depth];
      System.arraycopy(m_offsets, 0, new_offsets, 0, m_depth);
      m_offsets = new_offsets;
    }
    int result = m_offsets[m_depth];
    int new_size = result + count;
    m_offsets[m_depth++] = new_size;
    if (new_size > m_max_size)
    {
      m_max_size = Math.max(2 * m_max_size, new_size);
      byte[] new_buffer = new byte[m_max_size];
      System.arraycopy(m_buffer, 0, new_buffer, 0, result);
      m_buffer = new_buffer;
    }
    
    return result;
  }
  
  public void release()
  {
    if (m_depth<1)
    {
      throw new IllegalStateException("release() without reserve()");
    }
    m_depth--;
  }
}

1.	Fast Float Buffer
2.	Demonstrate the Frame Buffer Object OpenGL ES extension.
3.	Loads a file to a ByteBuffer.
4.	Make a direct NIO FloatBuffer from an array of floats
5.	Make a direct NIO ByteBuffer from an array of bytes
6.	Make Float Buffer From Array
7.	Creates a floatbuffer of the given size.
8.	Make Float Buffer with ByteBuffer.allocateDirect
9.	allocate Float Buffer
10.	to Short Buffer
11.	to Float Buffer Position Zero
12.	allocate Short Buffer
13.	allocate Int Buffer
14.	Read InputStream with BufferedReader
15.	To convert the InputStream to String we use the BufferedReader.readLine() method.
16.	make Float Buffer
17.	get Buffer From Array
18.	Your own float buffer
19.	Direct Buffer
20.	create Buffer
21.	Write String to File with BufferWriter
22.	Compute the SHA-1 hash of the bytes in the given buffer
23.	An utility class for java.nio.Buffers

Byte Buffer Stack : Buffer « File « Android

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