mirror of
https://github.com/crskycode/GARbro.git
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252 lines
9.4 KiB
C#
252 lines
9.4 KiB
C#
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//! \file ArcDAT.cs
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//! \date 2018 Nov 17
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//! \brief KID resource archive.
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//
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// Copyright (C) 2018 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.ComponentModel.Composition;
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using System.IO;
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using System.Security.Cryptography;
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using GameRes.Utility;
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namespace GameRes.Formats.Kid
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{
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[Export(typeof(ArchiveFormat))]
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public class LnkOpener : ArchiveFormat
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{
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public override string Tag { get { return "DAT/LNK"; } }
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public override string Description { get { return "KID resource archive"; } }
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public override uint Signature { get { return 0x4B4E4C; } } // 'LNK'
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public override bool IsHierarchic { get { return false; } }
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public override bool CanWrite { get { return false; } }
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LnkOpener ()
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{
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ContainedFormats = new[] { "PRT", "WAF" };
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}
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public override ArcFile TryOpen (ArcView file)
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{
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int count = file.View.ReadInt32 (4);
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if (!IsSaneCount (count))
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return null;
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uint index_offset = 0x10;
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long data_offset = index_offset + count * 32;
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var dir = new List<Entry> (count);
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for (int i = 0; i < count; ++i)
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{
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uint offset = file.View.ReadUInt32 (index_offset);
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uint size = file.View.ReadUInt32 (index_offset+4);
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var name = file.View.ReadString (index_offset+8, 0x18);
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if (string.IsNullOrWhiteSpace (name))
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return null;
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var entry = Create<PackedEntry> (name);
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entry.Offset = data_offset + offset;
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entry.Size = size >> 1;
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entry.IsPacked = (size & 1) != 0;
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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dir.Add (entry);
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index_offset += 0x20;
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}
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return new ArcFile (file, this, dir);
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}
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public override Stream OpenEntry (ArcFile arc, Entry entry)
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{
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IBinaryStream input = arc.File.CreateStream (entry.Offset, entry.Size, entry.Name);
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var pent = entry as PackedEntry;
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if (pent != null && pent.IsPacked && input.Signature == 0x646E6C) // 'lnd'
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{
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using (var lnd = input)
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{
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lnd.Position = 8;
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pent.UnpackedSize = lnd.ReadUInt32();
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lnd.ReadInt32();
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var data = new byte[pent.UnpackedSize];
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UnpackLnd (lnd, data);
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input = new BinMemoryStream (data, entry.Name);
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}
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}
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if (input.Signature == 0x535043) // 'CPS'
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{
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using (input)
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return UnpackCps (input);
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}
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return input.AsStream;
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}
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internal static void UnpackLnd (IBinaryStream input, byte[] output)
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{
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int unpacked_size = output.Length;
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int dst = 0;
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while (dst < unpacked_size)
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{
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int ctl = input.ReadByte();
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if (-1 == ctl)
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break;
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if ((ctl & 0x80) != 0)
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{
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if ((ctl & 0x40) != 0)
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{
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int count = (ctl & 0x1F) + 2;
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if ((ctl & 0x20) != 0)
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count += input.ReadUInt8() << 5;
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count = Math.Min (count, unpacked_size - dst);
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byte v = input.ReadUInt8();
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for (int i = 0; i < count; ++i)
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output[dst++] = v;
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}
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else
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{
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int count = ((ctl >> 2) & 0xF) + 2;
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int offset = ((ctl & 3) << 8) + input.ReadUInt8() + 1;
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count = Math.Min (count, unpacked_size - dst);
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Binary.CopyOverlapped (output, dst - offset, dst, count);
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dst += count;
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}
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}
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else if ((ctl & 0x40) != 0)
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{
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int length = Math.Min ((ctl & 0x3F) + 2, unpacked_size - dst);
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int count = input.ReadUInt8();
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input.Read (output, dst, length);
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dst += length;
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count = Math.Min (count * length, unpacked_size - dst);
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if (count > 0)
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{
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Binary.CopyOverlapped (output, dst - length, dst, count);
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dst += count;
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}
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}
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else
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{
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int count = (ctl & 0x1F) + 1;
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if ((ctl & 0x20) != 0)
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count += input.ReadUInt8() << 5;
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count = Math.Min (count, unpacked_size - dst);
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input.Read (output, dst, count);
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dst += count;
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}
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}
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}
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void UnpackLnd16 (IBinaryStream input, byte[] output)
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{
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throw new NotImplementedException ("KID Lnd16 compression not implemented.");
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}
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Stream UnpackCps (IBinaryStream input)
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{
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input.Seek (-4, SeekOrigin.End);
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uint key_offset = input.ReadUInt32() - 0x7534682;
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input.Position = key_offset;
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uint key = input.ReadUInt32() + key_offset + 0x3786425;
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var header = input.ReadHeader (0x10);
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int packed_size = header.ToInt32 (4);
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int compression = header.ToUInt16 (0xA);
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int unpacked_size = header.ToInt32 (0xC);
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var decryptor = new CpsTransform (packed_size, (int)key_offset, key);
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using (var decoded = new InputCryptoStream (input.AsStream, decryptor))
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using (var cps = new BinaryStream (decoded, input.Name))
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{
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var output = new byte[unpacked_size];
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if ((compression & 1) != 0)
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{
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cps.ReadInt32();
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UnpackLnd (cps, output);
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}
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else if ((compression & 2) != 0)
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{
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UnpackLnd16 (cps, output);
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}
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else
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{
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cps.ReadInt32();
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cps.Read (output, 0, unpacked_size);
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}
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return new BinMemoryStream (output);
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}
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}
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}
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internal sealed class CpsTransform : ICryptoTransform
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{
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const int BlockSize = 4;
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public bool CanReuseTransform { get { return false; } }
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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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int m_data_length;
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int m_key_offset;
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uint m_key;
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int m_position;
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public CpsTransform (int data_length, int key_offset, uint key)
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{
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m_data_length = data_length;
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m_key_offset = key_offset;
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m_key = key;
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m_position = 0x10;
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}
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public int TransformBlock (byte[] inputBuffer, int src, int inputCount,
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byte[] outputBuffer, int dst)
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{
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for (int i = 0; i < inputCount; i += BlockSize)
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{
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if (m_position == m_data_length - 4)
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{
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LittleEndian.Pack (0, outputBuffer, dst);
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break;
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}
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uint data = LittleEndian.ToUInt32 (inputBuffer, src);
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if (m_position != m_key_offset && m_key_offset != 0)
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data -= m_key + (uint)m_data_length;
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LittleEndian.Pack (data, outputBuffer, dst);
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src += 4;
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dst += 4;
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m_position += 4;
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m_key = 1103515245 * m_key + 39686;
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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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}
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}
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}
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