mirror of
https://github.com/crskycode/GARbro.git
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724 lines
27 KiB
C#
724 lines
27 KiB
C#
//! \file ArcNPA.cs
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//! \date Fri Jul 18 04:07:42 2014
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//! \brief NPA archive format implementation.
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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.Linq;
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using System.Text;
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using System.ComponentModel.Composition;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Runtime.InteropServices;
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using GameRes.Compression;
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using GameRes.Formats.Strings;
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using GameRes.Formats.Properties;
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using GameRes.Strings;
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namespace GameRes.Formats.NitroPlus
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{
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internal class NpaEntry : PackedEntry
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{
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public byte[] RawName;
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public int FolderId;
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}
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internal class NpaArchive : ArcFile
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{
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public EncryptionScheme Scheme { get; private set; }
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public int Key { get; private set; }
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public byte[] KeyTable { get { return m_key_table.Value; } }
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private Lazy<byte[]> m_key_table;
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public NpaArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir,
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EncryptionScheme scheme, int key)
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: base (arc, impl, dir)
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{
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Scheme = scheme;
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Key = key;
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m_key_table = new Lazy<byte[]> (() => NpaOpener.GenerateKeyTable (scheme));
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}
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}
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[Serializable]
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public class EncryptionScheme
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{
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public NpaTitleId TitleId;
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public uint NameKey;
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public byte[] Order;
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public EncryptionScheme (NpaTitleId id, uint key, byte[] order)
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{
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TitleId = id;
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NameKey = key;
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Order = order;
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}
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}
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[Serializable]
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public class NpaScheme : ResourceScheme
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{
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public Dictionary<string, EncryptionScheme> KnownSchemes;
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}
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public enum NpaTitleId
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{
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NotEncrypted,
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CHAOSHEAD, CHAOSHEADTR1, CHAOSHEADTR2, MURAMASATR, MURAMASA, SUMAGA, DJANGO, DJANGOTR,
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LAMENTO, SWEETPOOL, SUMAGASP, DEMONBANE, MURAMASAAD, AXANAEL, KIKOKUGAI, SONICOMITR2,
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SUMAGA3P, SONICOMI, LOSTX, LOSTXTRAILER, DRAMATICALMURDER, TOTONO, PHENOMENO, NEKODA,
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HANACHIRASU
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}
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public class NpaOptions : ResourceOptions
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{
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public EncryptionScheme Scheme { get; set; }
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public bool CompressContents { get; set; }
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public int Key1 { get; set; }
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public int Key2 { get; set; }
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}
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[Export(typeof(ArchiveFormat))]
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public class NpaOpener : ArchiveFormat
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{
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public override string Tag { get { return "NPA"; } }
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public override string Description { get { return arcStrings.NPADescription; } }
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public override uint Signature { get { return 0x0141504e; } } // NPA\x01
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public override bool IsHierarchic { get { return true; } }
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public override bool CanWrite { get { return true; } }
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public static Dictionary<string, EncryptionScheme> KnownSchemes = new Dictionary<string, EncryptionScheme>();
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public override ResourceScheme Scheme
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{
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get { return new NpaScheme { KnownSchemes = KnownSchemes }; }
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set { KnownSchemes = ((NpaScheme)value).KnownSchemes; }
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}
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public const int DefaultKey1 = 0x4147414e;
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public const int DefaultKey2 = 0x21214f54;
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public override ArcFile TryOpen (ArcView file)
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{
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int key1 = file.View.ReadInt32 (7);
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int key2 = file.View.ReadInt32 (11);
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bool compressed = 0 != file.View.ReadByte (15);
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bool encrypted = 0 != file.View.ReadByte (16);
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int total_count = file.View.ReadInt32 (17);
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int folder_count = file.View.ReadInt32 (21);
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int file_count = file.View.ReadInt32 (25);
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if (total_count < folder_count + file_count)
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return null;
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uint dir_size = file.View.ReadUInt32 (37);
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if (dir_size >= file.MaxOffset)
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return null;
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EncryptionScheme enc = null;
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var game_id = NpaTitleId.NotEncrypted;
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if (encrypted)
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{
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enc = QueryGameEncryption (file.Name);
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if (null == enc)
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throw new OperationCanceledException (garStrings.MsgUnknownEncryption);
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game_id = enc.TitleId;
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}
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int key = GetArchiveKey (game_id, key1, key2);
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long cur_offset = 41;
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var dir = new List<Entry> (file_count);
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for (int i = 0; i < total_count; ++i)
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{
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int name_size = file.View.ReadInt32 (cur_offset);
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if ((uint)name_size >= dir_size)
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return null;
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int type = file.View.ReadByte (cur_offset+4+name_size);
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if (1 != type) // ignore directory entries
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{
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var raw_name = new byte[name_size];
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file.View.Read (cur_offset+4, raw_name, 0, (uint)name_size);
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for (int x = 0; x < name_size; ++x)
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raw_name[x] += DecryptName (x, i, key);
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var info_offset = cur_offset + 5 + name_size;
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int id = file.View.ReadInt32 (info_offset);
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uint offset = file.View.ReadUInt32 (info_offset+4);
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uint size = file.View.ReadUInt32 (info_offset+8);
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uint unpacked_size = file.View.ReadUInt32 (info_offset+12);
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var entry = new NpaEntry {
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Name = Encodings.cp932.GetString (raw_name),
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Offset = dir_size+offset+41,
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Size = size,
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UnpackedSize = unpacked_size,
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RawName = raw_name,
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FolderId = id,
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};
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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entry.Type = FormatCatalog.Instance.GetTypeFromName (entry.Name);
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entry.IsPacked = compressed && entry.Type != "image";
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dir.Add (entry);
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}
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cur_offset += 4 + name_size + 17;
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}
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if (enc != null)
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return new NpaArchive (file, this, dir, enc, key);
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else
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return new ArcFile (file, this, dir);
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}
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public override void Create (Stream output, IEnumerable<Entry> list, ResourceOptions options,
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EntryCallback callback)
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{
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var npa_options = GetOptions<NpaOptions> (options);
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int callback_count = 0;
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// build file index
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var index = new Indexer (list, npa_options);
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output.Position = 41 + index.Size;
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long data_offset = 0;
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// write files
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foreach (var entry in index.Entries.Where (e => e.Type != "directory"))
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{
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if (data_offset > uint.MaxValue)
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throw new FileSizeException();
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if (null != callback)
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callback (callback_count++, entry, arcStrings.MsgAddingFile);
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using (var file = File.OpenRead (entry.Name))
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{
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var size = file.Length;
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if (size > uint.MaxValue)
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throw new FileSizeException();
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entry.Offset = data_offset;
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entry.UnpackedSize = (uint)size;
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Stream destination = output;
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if (null != npa_options.Scheme)
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destination = new EncryptedStream (output, entry, npa_options.Scheme, index.Key);
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try
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{
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if (entry.IsPacked)
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{
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var start = destination.Position;
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using (var zstream = new ZLibStream (destination, CompressionMode.Compress,
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CompressionLevel.Level9, true))
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{
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file.CopyTo (zstream);
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}
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entry.Size = (uint)(destination.Position - start);
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}
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else
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{
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file.CopyTo (destination);
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entry.Size = entry.UnpackedSize;
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}
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}
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finally
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{
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if (destination is EncryptedStream)
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destination.Dispose();
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}
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data_offset += entry.Size;
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}
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}
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if (null != callback)
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callback (callback_count++, null, arcStrings.MsgWritingIndex);
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output.Position = 0;
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using (var header = new BinaryWriter (output, Encoding.ASCII, true))
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{
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header.Write (Signature);
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header.Write ((short)0);
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header.Write ((byte)0);
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header.Write (npa_options.Key1);
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header.Write (npa_options.Key2);
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header.Write (npa_options.CompressContents);
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header.Write (npa_options.Scheme != null);
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header.Write (index.TotalCount);
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header.Write (index.FolderCount);
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header.Write (index.FileCount);
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header.Write ((long)0);
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header.Write (index.Size);
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int entry_number = 0;
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foreach (var entry in index.Entries)
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{
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header.Write (entry.RawName.Length);
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for (int i = 0; i < entry.RawName.Length; ++i)
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{
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header.Write ((byte)(entry.RawName[i] - DecryptName (i, entry_number, index.Key)));
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}
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header.Write ((byte)("directory" == entry.Type ? 1 : 2));
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header.Write (entry.FolderId);
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header.Write ((uint)entry.Offset);
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header.Write (entry.Size);
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header.Write (entry.UnpackedSize);
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++entry_number;
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}
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}
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}
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public override Stream OpenEntry (ArcFile arc, Entry entry)
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{
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Stream input;
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if (arc is NpaArchive && entry is NpaEntry)
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input = new EncryptedStream (arc as NpaArchive, entry as NpaEntry);
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else
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input = arc.File.CreateStream (entry.Offset, entry.Size);
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return UnpackEntry (input, entry as PackedEntry);
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}
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private Stream UnpackEntry (Stream input, PackedEntry entry)
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{
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if (null != entry && entry.IsPacked)
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return new ZLibStream (input, CompressionMode.Decompress);
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return input;
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}
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internal static byte DecryptName (int index, int curfile, int arc_key)
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{
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int key = 0xFC*index;
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key -= arc_key >> 0x18;
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key -= arc_key >> 0x10;
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key -= arc_key >> 0x08;
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key -= arc_key & 0xff;
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key -= curfile >> 0x18;
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key -= curfile >> 0x10;
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key -= curfile >> 0x08;
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key -= curfile;
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return (byte)(key & 0xff);
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}
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internal static int GetArchiveKey (NpaTitleId game_id, int key1, int key2)
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{
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if (NpaTitleId.LAMENTO == game_id)
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return key1 + key2;
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else
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return key1 * key2;
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}
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internal static byte GetKeyFromEntry (NpaEntry entry, EncryptionScheme scheme, int arc_key)
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{
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int key = (int)scheme.NameKey;
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var name = entry.RawName;
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for (int i = 0; i < name.Length; ++i)
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key -= name[i];
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key *= name.Length;
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if (scheme.TitleId != NpaTitleId.LAMENTO) // if the game is not Lamento
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{
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key += arc_key;
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key *= (int)entry.UnpackedSize;
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}
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return (byte)key;
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}
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public static byte[] GenerateKeyTable (EncryptionScheme scheme)
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{
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byte[] order = scheme.Order;
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if (null == order)
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throw new ArgumentException ("Encryption key table not defined", "title_id");
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var table = new byte[256];
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for (int i = 0; i < 256; ++i)
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{
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int edx = i << 4;
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int dl = (edx + order[i & 0x0f]) & 0xff;
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int dh = (edx + (order[i>>4] << 8)) & 0xff00;
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edx = (dh | dl) >> 4;
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var eax = BaseTable[i];
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table[eax] = (byte)(edx & 0xff);
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}
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for (int i = 17; i < order.Length; i+=2)
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{
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int ecx = order[i-1];
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int edx = order[i];
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byte tmp = table[ecx];
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table[ecx] = table[edx];
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table[edx] = tmp;
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}
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if (NpaTitleId.TOTONO == scheme.TitleId)
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{
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var totono_table = new byte[256];
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for (int i = 0; i < 256; ++i)
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{
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byte r = table[i];
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r = table[r];
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r = table[r];
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totono_table[i] = (byte)~r;
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}
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table = totono_table;
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}
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return table;
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}
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public override ResourceOptions GetDefaultOptions ()
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{
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return new NpaOptions {
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Scheme = GetScheme (Settings.Default.NPAScheme),
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CompressContents = Settings.Default.NPACompressContents,
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Key1 = (int)Settings.Default.NPAKey1,
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Key2 = (int)Settings.Default.NPAKey2,
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};
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}
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public override object GetAccessWidget ()
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{
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return new GUI.WidgetNPA();
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}
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public override object GetCreationWidget ()
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{
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return new GUI.CreateNPAWidget();
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}
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EncryptionScheme QueryGameEncryption (string arc_name)
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{
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EncryptionScheme scheme = null;
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var title = FormatCatalog.Instance.LookupGame (arc_name);
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if (!string.IsNullOrEmpty (title))
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scheme = GetScheme (title);
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if (null == scheme)
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{
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var options = Query<NpaOptions> (arcStrings.ArcEncryptedNotice);
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scheme = options.Scheme;
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}
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return scheme;
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}
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public static NpaTitleId GetTitleId (string title)
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{
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var scheme = GetScheme (title);
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return scheme != null ? scheme.TitleId : NpaTitleId.NotEncrypted;
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}
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public static EncryptionScheme GetScheme (string title)
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{
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EncryptionScheme scheme;
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if (KnownSchemes.TryGetValue (title, out scheme))
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return scheme;
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else
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return null;
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}
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static readonly byte[] BaseTable = {
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0x6F,0x05,0x6A,0xBF,0xA1,0xC7,0x8E,0xFB,0xD4,0x2F,0x80,0x58,0x4A,0x17,0x3B,0xB1,
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0x89,0xEC,0xA0,0x9F,0xD3,0xFC,0xC2,0x04,0x68,0x03,0xF3,0x25,0xBE,0x24,0xF1,0xBD,
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0xB8,0x41,0xC9,0x27,0x0E,0xA3,0xD8,0x7F,0x5B,0x8F,0x16,0x49,0xAA,0xB2,0x18,0xA7,
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0x33,0xE4,0xDB,0x48,0xCA,0xDE,0xAE,0xCD,0x13,0x1F,0x15,0x2E,0x39,0xF5,0x1E,0xDD,
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0x0F,0x88,0x4C,0x98,0x36,0xB4,0x3F,0x09,0x83,0xFD,0x32,0xBA,0x14,0x30,0x7A,0x63,
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0xB9,0x56,0x95,0x61,0xCC,0x8B,0xEF,0xDA,0xE5,0x2C,0xDC,0x12,0x1A,0x67,0x23,0x50,
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0xD1,0xC3,0x7E,0x6D,0xB6,0x90,0x3C,0xB3,0x0B,0xE2,0x91,0x70,0xA8,0xDF,0x44,0xC4,
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0xF4,0x01,0x5C,0x10,0x06,0xE7,0x54,0x40,0x43,0x72,0x38,0xBC,0xE3,0x07,0xFA,0x34,
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0x02,0xA4,0xF7,0x74,0xA9,0x4D,0x42,0xA5,0x85,0x35,0x79,0xD2,0x76,0x97,0x45,0x4F,
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0x08,0x5A,0xB0,0xEE,0x51,0x73,0x69,0x9E,0x94,0x47,0x77,0x29,0xD9,0x64,0x11,0xEB,
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0x37,0xAC,0x20,0x62,0x9A,0x6B,0x9C,0x75,0x22,0x87,0xAB,0x78,0x53,0xC8,0x5D,0xAD,
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0x2A,0xF2,0xCB,0xB7,0x0D,0xED,0x86,0x55,0xFF,0x19,0x57,0xD7,0xD5,0x60,0xC6,0x3D,
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0xEA,0xC1,0x6C,0xE1,0xC0,0x65,0x84,0xC5,0xE0,0x3E,0x7D,0x28,0x66,0xAF,0x1C,0x9B,
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0xCF,0x81,0x4E,0x26,0x59,0x2B,0x5F,0x7B,0xE8,0x8D,0x52,0x7C,0xF8,0x82,0x0C,0xF9,
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0x8C,0xE9,0xB5,0xE6,0x31,0x93,0x46,0x5E,0x1D,0x1B,0x4B,0x71,0xD6,0x92,0x3A,0xA6,
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0x2D,0x00,0x9D,0xBB,0x6E,0xF0,0x99,0xCE,0x21,0x0A,0xD0,0xF6,0xFE,0xA2,0x8A,0x96,
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};
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}
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/// <summary>
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/// Archive creation helper.
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/// </summary>
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internal class Indexer
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{
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List<NpaEntry> m_entries;
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Encoding m_encoding = Encodings.cp932.WithFatalFallback();
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int m_key;
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int m_size = 0;
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int m_directory_count = 0;
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int m_file_count = 0;
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|
|
public IEnumerable<NpaEntry> Entries { get { return m_entries; } }
|
|
|
|
public int Key { get { return m_key; } }
|
|
public int Size { get { return m_size; } }
|
|
public int TotalCount { get { return m_entries.Count; } }
|
|
public int FolderCount { get { return m_directory_count; } }
|
|
public int FileCount { get { return m_file_count; } }
|
|
|
|
public Indexer (IEnumerable<Entry> source_list, NpaOptions options)
|
|
{
|
|
m_entries = new List<NpaEntry> (source_list.Count());
|
|
var title_id = null != options.Scheme ? options.Scheme.TitleId : NpaTitleId.NotEncrypted;
|
|
m_key = NpaOpener.GetArchiveKey (title_id, options.Key1, options.Key2);
|
|
|
|
foreach (var entry in source_list)
|
|
{
|
|
string name = entry.Name;
|
|
try
|
|
{
|
|
var dir = Path.GetDirectoryName (name);
|
|
int folder_id = 0;
|
|
if (!string.IsNullOrEmpty (dir))
|
|
folder_id = AddDirectory (dir);
|
|
|
|
bool compress = options.CompressContents;
|
|
if (compress) // don't compress images
|
|
compress = !FormatCatalog.Instance.LookupFileName (name).OfType<ImageFormat>().Any();
|
|
var npa_entry = new NpaEntry
|
|
{
|
|
Name = name,
|
|
IsPacked = compress,
|
|
RawName = m_encoding.GetBytes (name),
|
|
FolderId = folder_id,
|
|
};
|
|
++m_file_count;
|
|
AddEntry (npa_entry);
|
|
}
|
|
catch (EncoderFallbackException X)
|
|
{
|
|
throw new InvalidFileName (name, arcStrings.MsgIllegalCharacters, X);
|
|
}
|
|
}
|
|
}
|
|
|
|
void AddEntry (NpaEntry entry)
|
|
{
|
|
m_entries.Add (entry);
|
|
m_size += 4 + entry.RawName.Length + 17;
|
|
}
|
|
|
|
Dictionary<string, int> m_directory_map = new Dictionary<string, int>();
|
|
|
|
int AddDirectory (string dir)
|
|
{
|
|
int folder_id = 0;
|
|
if (m_directory_map.TryGetValue (dir, out folder_id))
|
|
return folder_id;
|
|
string path = "";
|
|
foreach (var component in dir.Split (Path.DirectorySeparatorChar))
|
|
{
|
|
path = Path.Combine (path, component);
|
|
if (m_directory_map.TryGetValue (path, out folder_id))
|
|
continue;
|
|
folder_id = ++m_directory_count;
|
|
m_directory_map[path] = folder_id;
|
|
|
|
var npa_entry = new NpaEntry
|
|
{
|
|
Name = path,
|
|
Type = "directory",
|
|
Offset = 0,
|
|
Size = 0,
|
|
UnpackedSize = 0,
|
|
IsPacked = false,
|
|
RawName = m_encoding.GetBytes (path),
|
|
FolderId = folder_id,
|
|
};
|
|
AddEntry (npa_entry);
|
|
}
|
|
return folder_id;
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Stream class for files stored in encrypted NPA archives.
|
|
/// </summary>
|
|
internal class EncryptedStream : Stream
|
|
{
|
|
private Stream m_stream;
|
|
private Lazy<byte[]> m_encrypted;
|
|
private int m_encrypted_length;
|
|
private bool m_read_mode;
|
|
private long m_base_pos;
|
|
|
|
public override bool CanRead { get { return m_read_mode && m_stream.CanRead; } }
|
|
public override bool CanSeek { get { return m_stream.CanSeek; } }
|
|
public override bool CanWrite { get { return !m_read_mode && m_stream.CanWrite; } }
|
|
public override long Length { get { return m_stream.Length - m_base_pos; } }
|
|
public override long Position
|
|
{
|
|
get { return m_stream.Position - m_base_pos; }
|
|
set { m_stream.Position = m_base_pos + value; }
|
|
}
|
|
|
|
delegate byte CryptFunc (int index, byte value);
|
|
CryptFunc Encrypt;
|
|
|
|
public EncryptedStream (NpaArchive arc, NpaEntry entry)
|
|
{
|
|
m_read_mode = true;
|
|
m_encrypted_length = GetEncryptedLength (entry, arc.Scheme.TitleId);
|
|
if (m_encrypted_length > entry.Size)
|
|
m_encrypted_length = (int)entry.Size;
|
|
int key = NpaOpener.GetKeyFromEntry (entry, arc.Scheme, arc.Key);
|
|
|
|
m_stream = arc.File.CreateStream (entry.Offset, entry.Size);
|
|
m_encrypted = new Lazy<byte[]> (() => InitEncrypted (key, arc.Scheme.TitleId, arc.KeyTable));
|
|
m_base_pos = m_stream.Position;
|
|
}
|
|
|
|
public EncryptedStream (Stream output, NpaEntry entry, EncryptionScheme scheme, int arc_key)
|
|
{
|
|
m_read_mode = false;
|
|
m_encrypted_length = GetEncryptedLength (entry, scheme.TitleId);
|
|
int key = NpaOpener.GetKeyFromEntry (entry, scheme, arc_key);
|
|
|
|
m_stream = output;
|
|
m_encrypted = new Lazy<byte[]> (() => new byte[m_encrypted_length]);
|
|
m_base_pos = m_stream.Position;
|
|
|
|
byte[] decrypt_table = NpaOpener.GenerateKeyTable (scheme);
|
|
byte[] encrypt_table = new byte[256];
|
|
for (int i = 0; i < 256; ++i)
|
|
encrypt_table[decrypt_table[i]] = (byte)i;
|
|
|
|
if (NpaTitleId.LAMENTO == scheme.TitleId)
|
|
{
|
|
Encrypt = (i, x) => encrypt_table[(x + key) & 0xff];
|
|
}
|
|
else
|
|
{
|
|
Encrypt = (i, x) => encrypt_table[(x + key + i) & 0xff];
|
|
}
|
|
}
|
|
|
|
int GetEncryptedLength (NpaEntry entry, NpaTitleId game_id)
|
|
{
|
|
int length = 0x1000;
|
|
if (game_id != NpaTitleId.LAMENTO)
|
|
length += entry.RawName.Length;
|
|
return length;
|
|
}
|
|
|
|
byte[] InitEncrypted (int key, NpaTitleId game_id, byte[] key_table)
|
|
{
|
|
var position = Position;
|
|
if (0 != position)
|
|
Position = 0;
|
|
byte[] buffer = new byte[m_encrypted_length];
|
|
m_encrypted_length = m_stream.Read (buffer, 0, m_encrypted_length);
|
|
Position = position;
|
|
|
|
if (game_id == NpaTitleId.LAMENTO)
|
|
{
|
|
for (int i = 0; i < m_encrypted_length; i++)
|
|
buffer[i] = (byte)(key_table[buffer[i]] - key);
|
|
}
|
|
else
|
|
{
|
|
for (int i = 0; i < m_encrypted_length; i++)
|
|
buffer[i] = (byte)(key_table[buffer[i]] - key - i);
|
|
}
|
|
return buffer;
|
|
}
|
|
|
|
#region System.IO.Stream methods
|
|
public override void Flush()
|
|
{
|
|
m_stream.Flush();
|
|
}
|
|
|
|
public override long Seek (long offset, SeekOrigin origin)
|
|
{
|
|
if (SeekOrigin.Begin == origin)
|
|
offset += m_base_pos;
|
|
offset = m_stream.Seek (offset, origin);
|
|
return offset - m_base_pos;
|
|
}
|
|
|
|
public override void SetLength (long length)
|
|
{
|
|
throw new NotSupportedException ("EncryptedStream.SetLength is not supported");
|
|
}
|
|
|
|
public override int Read (byte[] buffer, int offset, int count)
|
|
{
|
|
var position = Position;
|
|
if (position >= m_encrypted_length)
|
|
return m_stream.Read (buffer, offset, count);
|
|
int read = Math.Min (m_encrypted_length - (int)position, count);
|
|
Buffer.BlockCopy (m_encrypted.Value, (int)position, buffer, offset, read);
|
|
m_stream.Seek (read, SeekOrigin.Current);
|
|
if (read < count)
|
|
{
|
|
read += m_stream.Read (buffer, offset+read, count-read);
|
|
}
|
|
return read;
|
|
}
|
|
|
|
public override int ReadByte ()
|
|
{
|
|
var position = Position;
|
|
if (position >= m_encrypted_length)
|
|
return m_stream.ReadByte();
|
|
m_stream.Seek (1, SeekOrigin.Current);
|
|
return m_encrypted.Value[(int)position];
|
|
}
|
|
|
|
public override void Write (byte[] buffer, int offset, int count)
|
|
{
|
|
var position = Position;
|
|
if (position < m_encrypted_length)
|
|
{
|
|
int limit = (int)position + Math.Min (m_encrypted_length - (int)position, count);
|
|
for (int i = (int)position; i < limit; ++i, ++offset, --count)
|
|
{
|
|
m_encrypted.Value[i] = Encrypt (i, buffer[offset]);
|
|
}
|
|
m_stream.Write (m_encrypted.Value, (int)position, limit-(int)position);
|
|
}
|
|
if (count > 0)
|
|
m_stream.Write (buffer, offset, count);
|
|
}
|
|
|
|
public override void WriteByte (byte value)
|
|
{
|
|
var position = Position;
|
|
if (position < m_encrypted_length)
|
|
value = Encrypt ((int)position, value);
|
|
m_stream.WriteByte (value);
|
|
}
|
|
#endregion
|
|
|
|
#region IDisposable Members
|
|
bool disposed = false;
|
|
protected override void Dispose (bool disposing)
|
|
{
|
|
if (!disposed)
|
|
{
|
|
if (disposing && m_read_mode)
|
|
{
|
|
m_stream.Dispose();
|
|
}
|
|
m_encrypted = null;
|
|
disposed = true;
|
|
base.Dispose (disposing);
|
|
}
|
|
}
|
|
#endregion
|
|
}
|
|
}
|