mirror of
https://github.com/crskycode/GARbro.git
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564 lines
20 KiB
C#
564 lines
20 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) 2014-2017 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.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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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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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 ArcViewStream CreateStream ()
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{
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return new ArcViewStream (this);
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}
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public ArcViewStream 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 ArcViewStream (this, offset, (uint)size);
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}
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public ArcViewStream CreateStream (long offset, uint size, string name = null)
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{
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return new ArcViewStream (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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private unsafe byte* m_mem;
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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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unsafe { m_mem = m_view.GetPointer (m_offset); }
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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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unsafe { m_mem = m_view.GetPointer (m_offset); }
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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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unsafe { m_mem = m_view.GetPointer (m_offset); }
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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 (disposed)
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throw new ObjectDisposedException (null);
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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.SafeMemoryMappedViewHandle.ReleasePointer();
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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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unsafe { m_mem = m_view.GetPointer (m_offset); }
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}
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return (uint)(m_offset + m_size - offset);
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}
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public void StrictReserve (long offset, uint size)
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{
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if (Reserve (offset, size) < size)
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throw new ArgumentException ("Not enough bytes to read in the memory mapped file view.", "offset");
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}
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public bool BytesEqual (long offset, byte[] 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_mem + (offset - m_offset);
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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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return true;
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}
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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_mem + (offset - m_offset);
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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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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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if (disposed)
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throw new ObjectDisposedException (null);
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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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Marshal.Copy ((IntPtr)(m_mem + (offset-m_offset)), buf, buf_offset, count);
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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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StrictReserve (offset, 1);
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unsafe { return m_mem[offset-m_offset]; }
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}
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public sbyte ReadSByte (long offset)
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{
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StrictReserve (offset, 1);
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unsafe { return (sbyte)m_mem[offset-m_offset]; }
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}
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public ushort ReadUInt16 (long offset)
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{
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StrictReserve (offset, 2);
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unsafe { return *(ushort*)(m_mem+offset-m_offset); }
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}
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public short ReadInt16 (long offset)
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{
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StrictReserve (offset, 2);
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unsafe { return *(short*)(m_mem+offset-m_offset); }
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}
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public uint ReadUInt32 (long offset)
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{
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StrictReserve (offset, 4);
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unsafe { return *(uint*)(m_mem+offset-m_offset); }
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}
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public int ReadInt32 (long offset)
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{
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StrictReserve (offset, 4);
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unsafe { return *(int*)(m_mem+offset-m_offset); }
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}
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public ulong ReadUInt64 (long offset)
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{
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StrictReserve (offset, 8);
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unsafe { return *(ulong*)(m_mem+offset-m_offset); }
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}
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public long ReadInt64 (long offset)
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{
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StrictReserve (offset, 8);
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unsafe { return *(long*)(m_mem+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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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_mem + (offset - m_offset);
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uint string_length = 0;
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// enc.WindowsCodePage property might throw an exception for some encodings, while
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// CodePage is just a direct field access.
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if (enc.CodePage == 1200 || enc.CodePage == 1201) // for UTF-16 encodings stop marker is 2-bytes long
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{
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ushort* u = (ushort*)s;
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while (string_length + 1 < size && 0 != u[string_length >> 1])
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{
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string_length += 2;
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}
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}
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else
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{
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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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}
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return new string ((sbyte*)s, 0, (int)string_length, enc);
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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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internal 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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unsafe
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{
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if (m_mem != null)
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{
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m_view.SafeMemoryMappedViewHandle.ReleasePointer();
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m_mem = null;
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}
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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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m_size = 0;
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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 Reader : System.IO.BinaryReader
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{
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public Reader (Stream stream) : base (stream, Encoding.ASCII, true)
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{
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}
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}
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}
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/// <summary>
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/// Unsafe wrapper around unmanaged memory mapped view pointer.
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/// </summary>
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public unsafe class ViewPointer : IDisposable
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{
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MemoryMappedViewAccessor m_view;
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byte* m_ptr;
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public ViewPointer (MemoryMappedViewAccessor view, long offset)
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{
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m_view = view;
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m_ptr = m_view.GetPointer (offset);
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}
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public byte* Value
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{
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get
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{
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if (!_disposed)
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return m_ptr;
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else
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throw new ObjectDisposedException (null, "Access to disposed ViewPointer object failed.");
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}
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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.SafeMemoryMappedViewHandle.ReleasePointer();
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}
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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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}
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