mirror of
https://github.com/crskycode/GARbro.git
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967 lines
34 KiB
C#
967 lines
34 KiB
C#
//! \file ArcView.cs
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//! \date Mon Jul 07 10:31:10 2014
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//! \brief Memory mapped view of gameres file.
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//
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// Copyright (C) 2014-2015 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System;
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using System.Diagnostics;
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using System.IO;
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using System.IO.MemoryMappedFiles;
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using System.Runtime.InteropServices;
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using System.Text;
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using GameRes.Utility;
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namespace GameRes
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{
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public static class Encodings
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{
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public static readonly Encoding cp932 = Encoding.GetEncoding (932);
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public static Encoding WithFatalFallback (this Encoding enc)
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{
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var encoding = enc.Clone() as Encoding;
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encoding.EncoderFallback = EncoderFallback.ExceptionFallback;
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encoding.DecoderFallback = DecoderFallback.ExceptionFallback;
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return encoding;
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}
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}
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public static class StreamExtension
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{
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static public string ReadStringUntil (this Stream file, byte delim, Encoding enc)
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{
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byte[] buffer = new byte[16];
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int size = 0;
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for (;;)
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{
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int b = file.ReadByte ();
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if (-1 == b || delim == b)
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break;
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if (buffer.Length == size)
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{
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Array.Resize (ref buffer, checked(size/2*3));
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}
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buffer[size++] = (byte)b;
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}
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return enc.GetString (buffer, 0, size);
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}
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static public string ReadCString (this Stream file, Encoding enc)
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{
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return ReadStringUntil (file, 0, enc);
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}
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static public string ReadCString (this Stream file)
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{
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return ReadStringUntil (file, 0, Encodings.cp932);
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}
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}
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public static class MappedViewExtension
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{
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static public string ReadString (this MemoryMappedViewAccessor view, long offset, uint size, Encoding enc)
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{
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if (0 == size)
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return string.Empty;
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byte[] buffer = new byte[size];
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uint n;
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for (n = 0; n < size; ++n)
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{
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byte b = view.ReadByte (offset+n);
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if (0 == b)
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break;
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buffer[n] = b;
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}
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return enc.GetString (buffer, 0, (int)n);
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}
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static public string ReadString (this MemoryMappedViewAccessor view, long offset, uint size)
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{
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return ReadString (view, offset, size, Encodings.cp932);
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}
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unsafe public static byte* GetPointer (this MemoryMappedViewAccessor view, long offset)
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{
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var num = offset % info.dwAllocationGranularity;
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byte* ptr = null;
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view.SafeMemoryMappedViewHandle.AcquirePointer (ref ptr);
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ptr += num;
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return ptr;
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}
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[DllImport("kernel32.dll", SetLastError = false)]
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internal static extern void GetSystemInfo (ref SYSTEM_INFO lpSystemInfo);
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[StructLayout (LayoutKind.Sequential)]
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internal struct SYSTEM_INFO
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{
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internal int dwOemId;
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internal int dwPageSize;
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internal IntPtr lpMinimumApplicationAddress;
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internal IntPtr lpMaximumApplicationAddress;
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internal IntPtr dwActiveProcessorMask;
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internal int dwNumberOfProcessors;
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internal int dwProcessorType;
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internal int dwAllocationGranularity;
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internal short wProcessorLevel;
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internal short wProcessorRevision;
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}
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static SYSTEM_INFO info;
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static MappedViewExtension()
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{
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GetSystemInfo (ref info);
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}
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}
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public class ArcView : IDisposable
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{
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private MemoryMappedFile m_map;
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public const long PageSize = 4096;
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public long MaxOffset { get; private set; }
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public Frame View { get; private set; }
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public string Name { get; private set; }
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public ArcView (string name)
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{
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using (var fs = new FileStream(name, FileMode.Open, FileAccess.Read, FileShare.Read))
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{
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Name = name;
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MaxOffset = fs.Length;
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InitFromFileStream (fs, 0);
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}
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}
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public ArcView (Stream input, string name, uint length)
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{
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Name = name;
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MaxOffset = length;
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if (input is FileStream)
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InitFromFileStream (input as FileStream, length);
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else
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InitFromStream (input, length);
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}
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private void InitFromFileStream (FileStream fs, uint length)
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{
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m_map = MemoryMappedFile.CreateFromFile (fs, null, length,
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MemoryMappedFileAccess.Read, null, HandleInheritability.None, true);
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try {
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View = new Frame (this);
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} catch {
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m_map.Dispose(); // dispose on error only
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throw;
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}
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}
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private void InitFromStream (Stream input, uint length)
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{
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m_map = MemoryMappedFile.CreateNew (null, length, MemoryMappedFileAccess.ReadWrite,
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MemoryMappedFileOptions.None, null, HandleInheritability.None);
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try
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{
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using (var view = m_map.CreateViewAccessor (0, length, MemoryMappedFileAccess.Write))
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{
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var buffer = new byte[81920];
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unsafe
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{
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byte* ptr = view.GetPointer (0);
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try
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{
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uint total = 0;
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while (total < length)
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{
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int read = input.Read (buffer, 0, buffer.Length);
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if (0 == read)
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break;
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read = (int)Math.Min (read, length-total);
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Marshal.Copy (buffer, 0, (IntPtr)(ptr+total), read);
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total += (uint)read;
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}
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MaxOffset = total;
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}
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finally
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{
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view.SafeMemoryMappedViewHandle.ReleasePointer();
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}
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}
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}
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View = new Frame (this);
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}
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catch
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{
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m_map.Dispose();
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throw;
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}
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}
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public Frame CreateFrame ()
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{
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return new Frame (View);
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}
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public ArcStream CreateStream ()
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{
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return new ArcStream (this);
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}
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public ArcStream CreateStream (long offset)
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{
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var size = this.MaxOffset - offset;
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if (size > uint.MaxValue)
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throw new ArgumentOutOfRangeException ("Too large memory mapped stream");
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return new ArcStream (this, offset, (uint)size);
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}
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public ArcStream CreateStream (long offset, uint size, string name = null)
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{
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return new ArcStream (this, offset, size, name);
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}
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public MemoryMappedViewAccessor CreateViewAccessor (long offset, uint size)
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{
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return m_map.CreateViewAccessor (offset, size, MemoryMappedFileAccess.Read);
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}
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#region IDisposable Members
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bool disposed = false;
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public void Dispose ()
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{
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Dispose (true);
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GC.SuppressFinalize (this);
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}
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protected virtual void Dispose (bool disposing)
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{
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if (!disposed)
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{
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if (disposing)
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{
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View.Dispose();
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m_map.Dispose();
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}
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disposed = true;
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m_map = null;
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}
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}
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#endregion
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public class Frame : IDisposable
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{
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private ArcView m_arc;
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private MemoryMappedViewAccessor m_view;
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private long m_offset;
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private uint m_size;
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public long Offset { get { return m_offset; } }
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public uint Reserved { get { return m_size; } }
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public Frame (ArcView arc)
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{
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m_arc = arc;
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m_offset = 0;
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m_size = (uint)Math.Min (ArcView.PageSize, m_arc.MaxOffset);
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m_view = m_arc.CreateViewAccessor (m_offset, m_size);
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}
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public Frame (Frame other)
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{
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m_arc = other.m_arc;
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m_offset = 0;
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m_size = (uint)Math.Min (ArcView.PageSize, m_arc.MaxOffset);
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m_view = m_arc.CreateViewAccessor (m_offset, m_size);
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}
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public Frame (ArcView arc, long offset, uint size)
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{
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m_arc = arc;
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m_offset = Math.Min (offset, m_arc.MaxOffset);
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m_size = (uint)Math.Min (size, m_arc.MaxOffset-m_offset);
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m_view = m_arc.CreateViewAccessor (m_offset, m_size);
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}
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public uint Reserve (long offset, uint size)
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{
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if (offset < m_offset || offset+size > m_offset+m_size)
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{
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if (offset > m_arc.MaxOffset)
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throw new ArgumentOutOfRangeException ("offset", "Too large offset specified for memory mapped file view.");
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if (size < ArcView.PageSize)
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size = (uint)ArcView.PageSize;
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if (size > m_arc.MaxOffset-offset)
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size = (uint)(m_arc.MaxOffset-offset);
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var old_view = m_view;
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m_view = m_arc.CreateViewAccessor (offset, size);
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old_view.Dispose();
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m_offset = offset;
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m_size = size;
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}
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return (uint)(m_offset + m_size - offset);
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}
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public bool AsciiEqual (long offset, string data)
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{
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if (Reserve (offset, (uint)data.Length) < (uint)data.Length)
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return false;
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unsafe
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{
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byte* ptr = m_view.GetPointer (m_offset) + (offset - m_offset);
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try {
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for (int i = 0; i < data.Length; ++i)
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{
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if (ptr[i] != data[i])
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return false;
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}
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} finally {
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m_view.SafeMemoryMappedViewHandle.ReleasePointer();
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}
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return true;
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}
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}
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public int Read (long offset, byte[] buf, int buf_offset, uint count)
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{
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// supposedly faster version of
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//Reserve (offset, count);
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//return m_view.ReadArray (offset-m_offset, buf, buf_offset, (int)count);
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if (buf == null)
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throw new ArgumentNullException ("buf", "Buffer cannot be null.");
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if (buf_offset < 0)
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throw new ArgumentOutOfRangeException ("buf_offset", "Buffer offset should be non-negative.");
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int total = (int)Math.Min (Reserve (offset, count), count);
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if (buf.Length - buf_offset < total)
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throw new ArgumentException ("Buffer offset and length are out of bounds.");
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UnsafeCopy (offset, buf, buf_offset, total);
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return total;
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}
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private unsafe void UnsafeCopy (long offset, byte[] buf, int buf_offset, int count)
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{
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byte* ptr = m_view.GetPointer (m_offset);
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try {
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Marshal.Copy ((IntPtr)(ptr+(offset-m_offset)), buf, buf_offset, count);
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} finally {
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m_view.SafeMemoryMappedViewHandle.ReleasePointer();
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}
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}
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/// <summary>
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/// Read <paramref name="count"/> bytes starting from <paramref name="offset"/> into byte array and return that array.
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/// Returned array could be less than <paramref name="count"/> bytes length if end of the mapped file was reached.
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/// </summary>
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public byte[] ReadBytes (long offset, uint count)
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{
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count = Math.Min (count, Reserve (offset, count));
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var data = new byte[count];
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if (count != 0)
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UnsafeCopy (offset, data, 0, data.Length);
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return data;
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}
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public byte ReadByte (long offset)
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{
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Reserve (offset, 1);
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return m_view.ReadByte (offset-m_offset);
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}
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public sbyte ReadSByte (long offset)
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{
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Reserve (offset, 1);
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return m_view.ReadSByte (offset-m_offset);
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}
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public ushort ReadUInt16 (long offset)
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{
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Reserve (offset, 2);
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return m_view.ReadUInt16 (offset-m_offset);
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}
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public short ReadInt16 (long offset)
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{
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Reserve (offset, 2);
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return m_view.ReadInt16 (offset-m_offset);
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}
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public uint ReadUInt32 (long offset)
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{
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Reserve (offset, 4);
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return m_view.ReadUInt32 (offset-m_offset);
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}
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public int ReadInt32 (long offset)
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{
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Reserve (offset, 4);
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return m_view.ReadInt32 (offset-m_offset);
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}
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public ulong ReadUInt64 (long offset)
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{
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Reserve (offset, 8);
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return m_view.ReadUInt64 (offset-m_offset);
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}
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public long ReadInt64 (long offset)
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{
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Reserve (offset, 8);
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return m_view.ReadInt64 (offset-m_offset);
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}
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public string ReadString (long offset, uint size, Encoding enc)
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{
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size = Math.Min (size, Reserve (offset, size));
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return m_view.ReadString (offset-m_offset, size, enc);
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/* unsafe implementation requires .Net v4.6
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if (0 == size)
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return string.Empty;
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unsafe
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{
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byte* s = m_view.GetPointer (m_offset) + (offset - m_offset);
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try
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{
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uint string_length = 0;
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while (string_length < size && 0 != s[string_length])
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{
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++string_length;
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}
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return enc.GetString (s, (int)string_length); // .Net v4.6+ only
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}
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finally
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{
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m_view.SafeMemoryMappedViewHandle.ReleasePointer();
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}
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}
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*/
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}
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public string ReadString (long offset, uint size)
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{
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return ReadString (offset, size, Encodings.cp932);
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}
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public unsafe ViewPointer GetPointer ()
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{
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return new ViewPointer (m_view, m_offset);
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}
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#region IDisposable Members
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bool disposed = false;
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public void Dispose ()
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{
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Dispose (true);
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GC.SuppressFinalize (this);
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}
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protected virtual void Dispose (bool disposing)
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{
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if (!disposed)
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{
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if (disposing)
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{
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m_view.Dispose();
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}
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m_arc = null;
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m_view = null;
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disposed = true;
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}
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}
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#endregion
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}
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public class ArcStream : Stream, IBinaryStream
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{
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private readonly Frame m_view;
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private readonly long m_start;
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private readonly long m_size;
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private long m_position;
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private byte[] m_buffer;
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private int m_buffer_pos; // read position within buffer
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private int m_buffer_len; // length of bytes read in buffer
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private const int DefaultBufferSize = 0x1000;
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public string Name { get; set; }
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public uint Signature { get { return ReadSignature(); } }
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public Stream AsStream { get { return this; } }
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public override bool CanRead { get { return !disposed; } }
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public override bool CanSeek { get { return !disposed; } }
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public override bool CanWrite { get { return false; } }
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public override long Length { get { return m_size; } }
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public override long Position
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{
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get { return m_position + (m_buffer_pos - m_buffer_len); }
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set {
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if (value < 0)
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throw new ArgumentOutOfRangeException ("value", "Stream position is out of range.");
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var buffer_start = m_position - m_buffer_len;
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if (m_buffer_pos != m_buffer_len && value >= buffer_start && value < m_position)
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{
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m_buffer_pos = (int)(value - buffer_start);
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}
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else
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{
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m_position = value;
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m_buffer_pos = m_buffer_len = 0;
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}
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}
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}
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public ArcStream (ArcView file)
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{
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m_view = file.CreateFrame();
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m_start = 0;
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m_size = file.MaxOffset;
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m_position = 0;
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Name = file.Name;
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}
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public ArcStream (Frame view, string name = null)
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{
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m_view = view;
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m_start = m_view.Offset;
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m_size = m_view.Reserved;
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m_position = 0;
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Name = name ?? "";
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}
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public ArcStream (ArcView file, long offset, uint size, string name = null)
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: this (new Frame (file, offset, size), name)
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{
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}
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public ArcStream (Frame view, long offset, uint size, string name = null)
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{
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m_view = view;
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m_start = offset;
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m_size = Math.Min (size, m_view.Reserve (offset, size));
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m_position = 0;
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Name = name ?? "";
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}
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/// <summary>
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/// Read stream signature (first 4 bytes) without altering current read position.
|
|
/// </summary>
|
|
public uint ReadSignature ()
|
|
{
|
|
return m_view.ReadUInt32 (m_start);
|
|
}
|
|
|
|
byte[] m_header;
|
|
int m_header_size;
|
|
|
|
public CowArray<byte> ReadHeader (int size)
|
|
{
|
|
if (m_header_size < size)
|
|
{
|
|
if (null == m_header || m_header.Length < size)
|
|
Array.Resize (ref m_header, (size + 0xF) & ~0xF);
|
|
long position = m_start + m_header_size;
|
|
m_header_size += m_view.Read (position, m_header, m_header_size, (uint)(size - m_header_size));
|
|
}
|
|
if (size > m_header_size)
|
|
{
|
|
Position = m_header_size;
|
|
throw new EndOfStreamException();
|
|
}
|
|
Position = size;
|
|
return new CowArray<byte> (m_header, 0, size);
|
|
}
|
|
|
|
private void RefillBuffer ()
|
|
{
|
|
if (null == m_buffer)
|
|
m_buffer = new byte[DefaultBufferSize];
|
|
uint length = (uint)Math.Min (m_size - m_position, m_buffer.Length);
|
|
m_buffer_len = m_view.Read (m_start + m_position, m_buffer, 0, length);
|
|
m_position += m_buffer_len;
|
|
m_buffer_pos = 0;
|
|
}
|
|
|
|
private void FlushBuffer ()
|
|
{
|
|
if (m_buffer_len != 0)
|
|
{
|
|
m_position += m_buffer_pos - m_buffer_len;
|
|
m_buffer_pos = m_buffer_len = 0;
|
|
}
|
|
}
|
|
|
|
private void EnsureAvailable (int length)
|
|
{
|
|
if (m_buffer_pos + length > m_buffer_len)
|
|
{
|
|
FlushBuffer();
|
|
if (m_position + length > m_size)
|
|
throw new EndOfStreamException();
|
|
RefillBuffer();
|
|
}
|
|
}
|
|
|
|
private int ReadFromBuffer (byte[] array, int offset, int count)
|
|
{
|
|
int available = Math.Min (m_buffer_len - m_buffer_pos, count);
|
|
if (available > 0)
|
|
{
|
|
Buffer.BlockCopy (m_buffer, m_buffer_pos, array, offset, available);
|
|
m_buffer_pos += available;
|
|
}
|
|
return available;
|
|
}
|
|
|
|
public int PeekByte ()
|
|
{
|
|
if (m_buffer_pos == m_buffer_len)
|
|
RefillBuffer();
|
|
if (m_buffer_pos == m_buffer_len)
|
|
return -1;
|
|
return m_buffer[m_buffer_pos];
|
|
}
|
|
|
|
public override int ReadByte ()
|
|
{
|
|
int b = PeekByte();
|
|
if (-1 != b)
|
|
++m_buffer_pos;
|
|
return b;
|
|
}
|
|
|
|
public sbyte ReadInt8 ()
|
|
{
|
|
int b = ReadByte();
|
|
if (-1 == b)
|
|
throw new EndOfStreamException();
|
|
return (sbyte)b;
|
|
}
|
|
|
|
public byte ReadUInt8 ()
|
|
{
|
|
return (byte)ReadInt8();
|
|
}
|
|
|
|
public short ReadInt16 ()
|
|
{
|
|
EnsureAvailable (2);
|
|
var v = m_buffer.ToInt16 (m_buffer_pos);
|
|
m_buffer_pos += 2;
|
|
return v;
|
|
}
|
|
|
|
public ushort ReadUInt16 ()
|
|
{
|
|
return (ushort)ReadInt16();
|
|
}
|
|
|
|
public int ReadInt24 ()
|
|
{
|
|
EnsureAvailable (3);
|
|
int v = m_buffer.ToInt24 (m_buffer_pos);
|
|
m_buffer_pos += 3;
|
|
return v;
|
|
}
|
|
|
|
public int ReadInt32 ()
|
|
{
|
|
EnsureAvailable (4);
|
|
int v = m_buffer.ToInt32 (m_buffer_pos);
|
|
m_buffer_pos += 4;
|
|
return v;
|
|
}
|
|
|
|
public uint ReadUInt32 ()
|
|
{
|
|
return (uint)ReadInt32();
|
|
}
|
|
|
|
public long ReadInt64 ()
|
|
{
|
|
EnsureAvailable (8);
|
|
var v = m_buffer.ToInt64 (m_buffer_pos);
|
|
m_buffer_pos += 8;
|
|
return v;
|
|
}
|
|
|
|
public ulong ReadUInt64 ()
|
|
{
|
|
return (ulong)ReadInt64();
|
|
}
|
|
|
|
public string ReadCString (int length)
|
|
{
|
|
return ReadCString (length, Encodings.cp932);
|
|
}
|
|
|
|
public string ReadCString (int length, Encoding enc)
|
|
{
|
|
if (m_buffer_pos == m_buffer_len && length <= DefaultBufferSize)
|
|
RefillBuffer();
|
|
if (m_buffer_pos + length <= m_buffer_len)
|
|
{
|
|
// whole string fit into buffer
|
|
var str = Binary.GetCString (m_buffer, m_buffer_pos, length, enc);
|
|
m_buffer_pos += length;
|
|
return str;
|
|
}
|
|
else if (length > DefaultBufferSize)
|
|
{
|
|
// requested string length is larger than internal buffer size
|
|
var string_buffer = ReadBytes (length);
|
|
return Binary.GetCString (string_buffer, 0, string_buffer.Length, enc);
|
|
}
|
|
else
|
|
{
|
|
int available = m_buffer_len - m_buffer_pos;
|
|
if (available > 0 && m_buffer_pos != 0)
|
|
Buffer.BlockCopy (m_buffer, m_buffer_pos, m_buffer, 0, available);
|
|
else if (null == m_buffer)
|
|
m_buffer = new byte[DefaultBufferSize];
|
|
int count = (int)Math.Min (m_buffer.Length - available, m_size - m_position);
|
|
if (count > 0)
|
|
{
|
|
int read = m_view.Read (m_start + m_position, m_buffer, available, (uint)count);
|
|
m_position += read;
|
|
available += read;
|
|
}
|
|
m_buffer_len = available;
|
|
m_buffer_pos = Math.Min (length, m_buffer_len);
|
|
return Binary.GetCString (m_buffer, 0, m_buffer_pos, enc);
|
|
}
|
|
}
|
|
|
|
public string ReadCString ()
|
|
{
|
|
return ReadCString (Encodings.cp932);
|
|
}
|
|
|
|
public string ReadCString (Encoding enc)
|
|
{
|
|
if (m_buffer_pos == m_buffer_len)
|
|
RefillBuffer();
|
|
int available = m_buffer_len - m_buffer_pos;
|
|
if (0 == available)
|
|
return string.Empty;
|
|
|
|
int zero = Array.IndexOf<byte> (m_buffer, 0, m_buffer_pos, available);
|
|
if (zero != -1)
|
|
{
|
|
// null byte found within buffer
|
|
var str = enc.GetString (m_buffer, m_buffer_pos, zero - m_buffer_pos);
|
|
m_buffer_pos = zero+1;
|
|
return str;
|
|
}
|
|
// underlying view includes whole stream
|
|
if (m_view.Offset <= m_start && m_view.Offset + m_view.Reserved >= m_start + m_size)
|
|
return ReadCStringUnsafe (enc, available);
|
|
|
|
var string_buf = new byte[Math.Max (0x20, available * 2)];
|
|
ReadFromBuffer (string_buf, 0, available);
|
|
int size = available;
|
|
for (;;)
|
|
{
|
|
int b = ReadByte();
|
|
if (-1 == b || 0 == b)
|
|
break;
|
|
if (string_buf.Length == size)
|
|
{
|
|
Array.Resize (ref string_buf, checked(size*3/2));
|
|
}
|
|
string_buf[size++] = (byte)b;
|
|
}
|
|
return enc.GetString (string_buf, 0, size);
|
|
}
|
|
|
|
private unsafe string ReadCStringUnsafe (Encoding enc, int skip_bytes = 0)
|
|
{
|
|
Debug.Assert (m_view.Offset + m_view.Reserved >= m_start + m_size);
|
|
FlushBuffer();
|
|
using (var ptr = m_view.GetPointer())
|
|
{
|
|
byte* s = ptr.Value + (m_start - m_view.Offset + m_position);
|
|
int view_length = (int)(m_size - m_position);
|
|
int string_length = Math.Min (skip_bytes, view_length);
|
|
while (string_length < view_length && 0 != s[string_length])
|
|
{
|
|
++string_length;
|
|
}
|
|
m_position += string_length;
|
|
if (string_length < view_length)
|
|
++m_position;
|
|
// return enc.GetString (s, string_length); // .Net v4.6+ only
|
|
var string_buf = new byte[string_length];
|
|
Marshal.Copy ((IntPtr)s, string_buf, 0, string_length);
|
|
return enc.GetString (string_buf, 0, string_length);
|
|
}
|
|
}
|
|
|
|
public byte[] ReadBytes (int count)
|
|
{
|
|
if (m_buffer_pos + count <= m_buffer_len && m_buffer_len != 0)
|
|
{
|
|
var data = new CowArray<byte> (m_buffer, m_buffer_pos, count).ToArray();
|
|
m_buffer_pos += count;
|
|
return data;
|
|
}
|
|
var current_pos = Position;
|
|
if (0 == count || current_pos >= m_size)
|
|
return new byte[0];
|
|
var bytes = m_view.ReadBytes (m_start+current_pos, (uint)Math.Min (count, m_size - current_pos));
|
|
Position = current_pos + bytes.Length;
|
|
return bytes;
|
|
}
|
|
|
|
#region System.IO.Stream methods
|
|
public override void Flush()
|
|
{
|
|
FlushBuffer();
|
|
}
|
|
|
|
public override long Seek (long offset, SeekOrigin origin)
|
|
{
|
|
switch (origin)
|
|
{
|
|
case SeekOrigin.Begin: Position = offset; break;
|
|
case SeekOrigin.Current: Position += offset; break;
|
|
case SeekOrigin.End: Position = m_size + offset; break;
|
|
}
|
|
return Position;
|
|
}
|
|
|
|
public override void SetLength (long length)
|
|
{
|
|
throw new NotSupportedException ("GameRes.ArcStream.SetLength method is not supported");
|
|
}
|
|
|
|
public override int Read (byte[] buffer, int offset, int count)
|
|
{
|
|
int read_from_buffer = ReadFromBuffer (buffer, offset, count);
|
|
offset += read_from_buffer;
|
|
count -= read_from_buffer;
|
|
if (0 == count || m_position >= m_size)
|
|
return read_from_buffer;
|
|
if (count < DefaultBufferSize)
|
|
{
|
|
RefillBuffer();
|
|
count = Math.Min (count, m_buffer_len);
|
|
Buffer.BlockCopy (m_buffer, m_buffer_pos, buffer, offset, count);
|
|
m_buffer_pos += count;
|
|
return read_from_buffer + count;
|
|
}
|
|
else
|
|
{
|
|
uint view_count = (uint)Math.Min (count, m_size - m_position);
|
|
int read_from_view = m_view.Read (m_start + m_position, buffer, offset, view_count);
|
|
m_position += read_from_view;
|
|
return read_from_buffer + read_from_view;
|
|
}
|
|
}
|
|
|
|
public override void Write (byte[] buffer, int offset, int count)
|
|
{
|
|
throw new NotSupportedException("GameRes.ArcStream.Write method is not supported");
|
|
}
|
|
|
|
public override void WriteByte (byte value)
|
|
{
|
|
throw new NotSupportedException("GameRes.ArcStream.WriteByte method is not supported");
|
|
}
|
|
#endregion
|
|
|
|
#region IDisposable Members
|
|
bool disposed = false;
|
|
protected override void Dispose (bool disposing)
|
|
{
|
|
if (!disposed)
|
|
{
|
|
if (disposing)
|
|
{
|
|
m_view.Dispose();
|
|
}
|
|
disposed = true;
|
|
base.Dispose (disposing);
|
|
}
|
|
}
|
|
#endregion
|
|
}
|
|
|
|
public class Reader : System.IO.BinaryReader
|
|
{
|
|
public Reader (Stream stream) : base (stream, Encoding.ASCII, true)
|
|
{
|
|
}
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Unsafe wrapper around unmanaged memory mapped view pointer.
|
|
/// </summary>
|
|
public unsafe class ViewPointer : IDisposable
|
|
{
|
|
MemoryMappedViewAccessor m_view;
|
|
byte* m_ptr;
|
|
|
|
public ViewPointer (MemoryMappedViewAccessor view, long offset)
|
|
{
|
|
m_view = view;
|
|
m_ptr = m_view.GetPointer (offset);
|
|
}
|
|
|
|
public byte* Value
|
|
{
|
|
get
|
|
{
|
|
if (!_disposed)
|
|
return m_ptr;
|
|
else
|
|
throw new ObjectDisposedException ("Access to disposed ViewPointer object failed.");
|
|
}
|
|
}
|
|
|
|
#region IDisposable Members
|
|
bool _disposed = false;
|
|
|
|
public void Dispose ()
|
|
{
|
|
Dispose (true);
|
|
GC.SuppressFinalize (this);
|
|
}
|
|
|
|
protected virtual void Dispose (bool disposing)
|
|
{
|
|
if (!_disposed)
|
|
{
|
|
if (disposing)
|
|
{
|
|
m_view.SafeMemoryMappedViewHandle.ReleasePointer();
|
|
}
|
|
_disposed = true;
|
|
}
|
|
}
|
|
#endregion
|
|
}
|
|
}
|