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420 lines
13 KiB
C#
420 lines
13 KiB
C#
//! \file ArcCommon.cs
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//! \date Tue Aug 19 09:45:38 2014
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//! \brief Classes and functions common for various resource files.
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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.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Security.Cryptography;
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using System.Text;
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namespace GameRes.Formats
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{
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public class AutoEntry : Entry
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{
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private Lazy<IResource> m_res;
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private Lazy<string> m_name;
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private Lazy<string> m_type;
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public override string Name
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{
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get { return m_name.Value; }
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set { m_name = new Lazy<string> (() => value); }
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}
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public override string Type
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{
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get { return m_type.Value; }
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set { m_type = new Lazy<string> (() => value); }
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}
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public AutoEntry (string name, Func<IResource> type_checker)
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{
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m_res = new Lazy<IResource> (type_checker);
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m_name = new Lazy<string> (() => GetName (name));
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m_type = new Lazy<string> (GetEntryType);
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}
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public static AutoEntry Create (ArcView file, long offset, string base_name)
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{
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return new AutoEntry (base_name, () => {
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uint signature = file.View.ReadUInt32 (offset);
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return FormatCatalog.Instance.LookupSignature (signature).FirstOrDefault();
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}) { Offset = offset };
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}
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private string GetName (string name)
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{
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if (null == m_res.Value)
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return name;
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var ext = m_res.Value.Extensions.FirstOrDefault();
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if (string.IsNullOrEmpty (ext))
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return name;
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return Path.ChangeExtension (name, ext);
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}
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private string GetEntryType ()
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{
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return null == m_res.Value ? "" : m_res.Value.Type;
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}
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}
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public class PrefixStream : Stream
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{
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byte[] m_header;
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Stream m_stream;
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long m_position = 0;
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bool m_should_dispose;
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public PrefixStream (byte[] header, Stream main, bool leave_open = false)
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{
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m_header = header;
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m_stream = main;
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m_should_dispose = !leave_open;
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}
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public override bool CanRead { get { return m_stream.CanRead; } }
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public override bool CanSeek { get { return m_stream.CanSeek; } }
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public override bool CanWrite { get { return false; } }
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public override long Length { get { return m_stream.Length + m_header.Length; } }
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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
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{
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m_position = Math.Max (value, 0);
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if (m_position > m_header.Length)
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{
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long stream_pos = m_stream.Seek (m_position - m_header.Length, SeekOrigin.Begin);
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m_position = m_header.Length + stream_pos;
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}
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}
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}
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public override void Flush()
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{
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m_stream.Flush();
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}
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public override long Seek (long offset, SeekOrigin origin)
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{
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if (SeekOrigin.Begin == origin)
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Position = offset;
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else if (SeekOrigin.Current == origin)
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Position = m_position + offset;
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else
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Position = Length + offset;
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return m_position;
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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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int read = 0;
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if (m_position < m_header.Length)
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{
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int header_count = Math.Min (count, m_header.Length - (int)m_position);
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Buffer.BlockCopy (m_header, (int)m_position, buffer, offset, header_count);
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m_position += header_count;
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read += header_count;
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offset += header_count;
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count -= header_count;
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}
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if (count > 0)
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{
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if (m_header.Length == m_position)
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m_stream.Position = 0;
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int stream_read = m_stream.Read (buffer, offset, count);
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m_position += stream_read;
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read += stream_read;
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}
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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_header.Length)
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return m_header[m_position++];
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if (m_position == m_header.Length)
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m_stream.Position = 0;
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int b = m_stream.ReadByte();
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if (-1 != b)
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m_position++;
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return b;
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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 ("PrefixStream.SetLength method is not supported");
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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 ("PrefixStream.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 ("PrefixStream.WriteByte method is not supported");
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}
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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 (m_should_dispose && disposing)
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m_stream.Dispose();
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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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}
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/// <summary>
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/// Represents a region within existing stream.
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/// Underlying stream should allow seeking (CanSeek == true).
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/// </summary>
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public class StreamRegion : Stream
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{
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private Stream m_stream;
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private long m_begin;
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private long m_end;
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private bool m_should_dispose;
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public StreamRegion (Stream main, long offset, long length, bool leave_open = false)
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{
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m_stream = main;
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m_begin = offset;
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m_end = Math.Min (offset + length, m_stream.Length);
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m_stream.Position = m_begin;
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m_should_dispose = !leave_open;
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}
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public StreamRegion (Stream main, long offset, bool leave_open = false)
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: this (main, offset, main.Length-offset, leave_open)
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{
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}
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public override bool CanRead { get { return m_stream.CanRead; } }
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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_end - m_begin; } }
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public override long Position
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{
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get { return m_stream.Position - m_begin; }
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set { m_stream.Position = Math.Max (m_begin + value, m_begin); }
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}
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public override void Flush()
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{
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m_stream.Flush();
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}
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public override long Seek (long offset, SeekOrigin origin)
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{
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if (SeekOrigin.Begin == origin)
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offset += m_begin;
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else if (SeekOrigin.Current == origin)
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offset += m_stream.Position;
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else
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offset += m_end;
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offset = Math.Max (offset, m_begin);
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m_stream.Position = offset;
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return offset - m_begin;
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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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int read = 0;
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long available = m_end - m_stream.Position;
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if (available > 0)
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{
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read = m_stream.Read (buffer, offset, (int)Math.Min (count, available));
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}
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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_stream.Position < m_end)
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return m_stream.ReadByte();
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else
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return -1;
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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 ("StreamRegion.SetLength method is not supported");
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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 ("StreamRegion.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 ("StreamRegion.WriteByte method is not supported");
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}
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bool m_disposed = false;
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protected override void Dispose (bool disposing)
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{
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if (!m_disposed)
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{
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if (m_should_dispose && disposing)
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m_stream.Dispose();
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m_disposed = true;
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base.Dispose (disposing);
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}
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}
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}
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public class HuffmanDecoder
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{
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byte[] m_src;
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byte[] m_dst;
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ushort[] lhs = new ushort[512];
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ushort[] rhs = new ushort[512];
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ushort token = 256;
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int m_input_pos;
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int m_remaining;
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int m_cached_bits;
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int m_cache;
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public HuffmanDecoder (byte[] src, int index, int length, byte[] dst)
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{
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m_src = src;
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m_dst = dst;
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m_input_pos = index;
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m_remaining = length;
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m_cached_bits = 0;
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m_cache = 0;
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}
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public HuffmanDecoder (byte[] src, byte[] dst) : this (src, 0, src.Length, dst)
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{
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}
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public byte[] Unpack ()
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{
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int dst = 0;
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token = 256;
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ushort v3 = CreateTree();
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while (dst < m_dst.Length)
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{
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ushort symbol = v3;
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while ( symbol >= 0x100u )
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{
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if ( 0 != GetBits (1) )
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symbol = rhs[symbol];
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else
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symbol = lhs[symbol];
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}
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m_dst[dst++] = (byte)symbol;
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}
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return m_dst;
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}
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ushort CreateTree()
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{
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if ( 0 != GetBits (1) )
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{
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ushort v = token++;
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lhs[v] = CreateTree();
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rhs[v] = CreateTree();
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return v;
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}
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else
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{
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return (ushort)GetBits (8);
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}
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}
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uint GetBits (int n)
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{
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while (n > m_cached_bits)
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{
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if (0 == m_remaining)
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throw new ApplicationException ("Invalid huffman-compressed stream");
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int v = m_src[m_input_pos++];
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--m_remaining;
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m_cache = v | (m_cache << 8);
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m_cached_bits += 8;
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}
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uint mask = (uint)m_cache;
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m_cached_bits -= n;
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m_cache &= ~(-1 << m_cached_bits);
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return (uint)(((-1 << m_cached_bits) & mask) >> m_cached_bits);
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}
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}
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public sealed class NotTransform : ICryptoTransform
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{
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private const int BlockSize = 256;
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public bool CanReuseTransform { get { return true; } }
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public bool CanTransformMultipleBlocks { get { return true; } }
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public int InputBlockSize { get { return BlockSize; } }
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public int OutputBlockSize { get { return BlockSize; } }
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public int TransformBlock (byte[] inputBuffer, int inputOffset, int inputCount,
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byte[] outputBuffer, int outputOffset)
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{
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for (int i = 0; i < inputCount; ++i)
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{
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outputBuffer[outputOffset++] = (byte)~inputBuffer[inputOffset+i];
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}
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return inputCount;
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}
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public byte[] TransformFinalBlock (byte[] inputBuffer, int inputOffset, int inputCount)
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{
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byte[] outputBuffer = new byte[inputCount];
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TransformBlock (inputBuffer, inputOffset, inputCount, outputBuffer, 0);
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return outputBuffer;
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}
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public void Dispose ()
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{
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System.GC.SuppressFinalize (this);
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}
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}
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public static class Dump
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{
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public static string DirectoryName = Environment.GetFolderPath (Environment.SpecialFolder.UserProfile);
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[System.Diagnostics.Conditional("DEBUG")]
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public static void Write (byte[] mem, string filename = "index.dat")
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{
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using (var dump = File.Create (Path.Combine (DirectoryName, filename)))
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dump.Write (mem, 0, mem.Length);
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}
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}
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}
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