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NativeMemoryStream.cs
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158 lines (128 loc) · 3.45 KB
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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
namespace ScintillaNET
{
/// <summary>
/// Like an UnmanagedMemoryStream execpt it can grow.
/// </summary>
internal sealed unsafe class NativeMemoryStream : Stream
{
#region Fields
private IntPtr ptr;
private int capacity;
private int position;
private int length;
#endregion Fields
#region Methods
protected override void Dispose(bool disposing)
{
if(FreeOnDispose)
Marshal.FreeHGlobal(ptr);
base.Dispose(disposing);
}
public override void Flush()
{
// NOP
}
public override int Read(byte[] buffer, int offset, int count)
{
throw new NotImplementedException();
}
public override long Seek(long offset, SeekOrigin origin)
{
switch (origin)
{
case SeekOrigin.Begin:
position = (int)offset;
break;
default:
throw new NotImplementedException();
}
return position;
}
public override void SetLength(long value)
{
throw new NotImplementedException();
}
public override void Write(byte[] buffer, int offset, int count)
{
if ((position + count) > capacity)
{
// Realloc buffer
var minCapacity = (position + count);
var newCapacity = (capacity * 2);
if (newCapacity < minCapacity)
newCapacity = minCapacity;
var newPtr = Marshal.AllocHGlobal(newCapacity);
NativeMethods.MoveMemory(newPtr, ptr, length);
Marshal.FreeHGlobal(ptr);
ptr = newPtr;
capacity = newCapacity;
}
Marshal.Copy(buffer, offset, ptr + position, count);
position += count;
length = Math.Max(length, position);
}
#endregion Methods
#region Properties
public override bool CanRead
{
get { throw new NotImplementedException(); }
}
public override bool CanSeek
{
get
{
return true;
}
}
public override bool CanWrite
{
get
{
return true;
}
}
public bool FreeOnDispose { get; set; }
public override long Length
{
get
{
return length;
}
}
public IntPtr Pointer
{
get
{
return ptr;
}
}
public override long Position
{
get
{
return position;
}
set
{
throw new NotImplementedException();
}
}
#endregion Properties
#region Constructors
public NativeMemoryStream(int capacity)
{
if (capacity < 4)
capacity = 4;
this.capacity = capacity;
this.ptr = Marshal.AllocHGlobal(capacity);
FreeOnDispose = true;
}
#endregion Constructors
}
}