mirror of
https://github.com/crskycode/GARbro.git
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498 lines
17 KiB
C#
498 lines
17 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 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 (Encoding enc)
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{
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enc = enc.Clone() as Encoding;
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enc.EncoderFallback = EncoderFallback.ExceptionFallback;
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return enc;
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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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byte[] new_buffer = new byte[checked(size/2*3)];
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Array.Copy (buffer, new_buffer, size);
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buffer = new_buffer;
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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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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 = view.PointerOffset % 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 = true)]
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internal static extern void GetSystemInfo (ref SYSTEM_INFO lpSystemInfo);
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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 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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MaxOffset = fs.Length;
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m_map = MemoryMappedFile.CreateFromFile (fs, null, 0,
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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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}
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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, uint size)
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{
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return new ArcStream (this, offset, size);
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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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m_view.Dispose();
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m_view = m_arc.CreateViewAccessor (offset, size);
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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);
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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[offset-m_offset+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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unsafe
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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, total);
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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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return total;
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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 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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Reserve (offset, size);
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return m_view.ReadString (offset-m_offset, size, enc);
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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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#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 : System.IO.Stream
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{
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private Frame m_view;
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private long m_start;
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private uint m_size;
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private long m_position;
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public override bool CanRead { get { return true; } }
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public override bool CanSeek { get { return true; } }
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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; }
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set { m_position = Math.Max (value, 0); }
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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 = (uint)Math.Min (file.MaxOffset, uint.MaxValue);
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m_position = 0;
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}
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public ArcStream (ArcView file, long offset, uint size)
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{
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m_view = new Frame (file, offset, size);
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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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}
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/// <summary>
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/// Read stream signature (first 4 bytes) without altering current read position.
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/// </summary>
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public uint ReadSignature ()
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{
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return m_view.ReadUInt32 (m_start);
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}
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#region System.IO.Stream methods
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public override void Flush()
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{
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}
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public override long Seek (long offset, SeekOrigin origin)
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{
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switch (origin)
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{
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case SeekOrigin.Begin: m_position = offset; break;
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case SeekOrigin.Current: m_position += offset; break;
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case SeekOrigin.End: m_position = m_size + offset; break;
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}
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if (m_position < 0)
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m_position = 0;
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return m_position;
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}
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public override void SetLength (long length)
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{
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throw new NotSupportedException ("GameRes.ArcStream.SetLength method is not supported");
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}
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public override int Read (byte[] buffer, int offset, int count)
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{
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if (m_position >= m_size)
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return 0;
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count = (int)Math.Min (count, m_size - m_position);
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int read = m_view.Read (m_start + m_position, buffer, offset, (uint)count);
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m_position += read;
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return read;
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}
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public override int ReadByte ()
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{
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if (m_position >= m_size)
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return -1;
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byte b = m_view.ReadByte (m_start+m_position);
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++m_position;
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return b;
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}
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public override void Write (byte[] buffer, int offset, int count)
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{
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throw new NotSupportedException("GameRes.ArcStream.Write method is not supported");
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}
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public override void WriteByte (byte value)
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{
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throw new NotSupportedException("GameRes.ArcStream.WriteByte method is not supported");
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}
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#endregion
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#region IDisposable Members
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bool disposed = false;
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protected override 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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disposed = true;
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base.Dispose (disposing);
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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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}
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