mirror of
https://github.com/crskycode/GARbro.git
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871 lines
35 KiB
C#
871 lines
35 KiB
C#
//! \file ArcXP3.cs
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//! \date Wed Jul 16 13:58:17 2014
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//! \brief KiriKiri engine archive implementation.
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//
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// Copyright (C) 2014-2017 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System;
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using System.IO;
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using System.IO.MemoryMappedFiles;
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using System.Text;
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using System.Text.RegularExpressions;
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using System.Linq;
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using System.Collections.Generic;
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using System.ComponentModel.Composition;
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using System.Runtime.InteropServices;
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using System.Security.Cryptography;
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using System.Diagnostics;
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using GameRes.Compression;
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using GameRes.Utility;
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using GameRes.Formats.Strings;
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using GameRes.Formats.Properties;
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namespace GameRes.Formats.KiriKiri
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{
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public struct Xp3Segment
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{
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public bool IsCompressed;
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public long Offset;
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public uint Size;
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public uint PackedSize;
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}
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public class Xp3Entry : PackedEntry
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{
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List<Xp3Segment> m_segments = new List<Xp3Segment>();
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public bool IsEncrypted { get; set; }
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public ICrypt Cipher { get; set; }
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public List<Xp3Segment> Segments { get { return m_segments; } }
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public uint Hash { get; set; }
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}
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public class Xp3Options : ResourceOptions
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{
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public int Version { get; set; }
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public ICrypt Scheme { get; set; }
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public bool CompressIndex { get; set; }
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public bool CompressContents { get; set; }
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public bool RetainDirs { get; set; }
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}
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[Serializable]
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public class Xp3Scheme : ResourceScheme
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{
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public IDictionary<string, ICrypt> KnownSchemes;
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public ISet<string> NoCryptTitles;
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}
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// Archive version 1: encrypt file first, then calculate checksum
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// version 2: calculate checksum, then encrypt
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[Export(typeof(ArchiveFormat))]
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public class Xp3Opener : ArchiveFormat
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{
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public override string Tag { get { return "XP3"; } }
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public override string Description { get { return arcStrings.XP3Description; } }
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public override uint Signature { get { return 0x0d335058; } }
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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 Xp3Opener ()
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{
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Signatures = new uint[] { 0x0d335058, 0 };
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}
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static readonly byte[] s_xp3_header = {
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(byte)'X', (byte)'P', (byte)'3', 0x0d, 0x0a, 0x20, 0x0a, 0x1a, 0x8b, 0x67, 0x01
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};
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public bool ForceEncryptionQuery = true;
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internal static readonly ICrypt NoCryptAlgorithm = new NoCrypt();
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public override ArcFile TryOpen (ArcView file)
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{
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long base_offset = 0;
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if (0x5a4d == file.View.ReadUInt16 (0)) // 'MZ'
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base_offset = SkipExeHeader (file, s_xp3_header);
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if (!file.View.BytesEqual (base_offset, s_xp3_header))
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return null;
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long dir_offset = base_offset + file.View.ReadInt64 (base_offset+0x0b);
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if (dir_offset < 0x13 || dir_offset >= file.MaxOffset)
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return null;
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if (0x80 == file.View.ReadUInt32 (dir_offset))
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{
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dir_offset = base_offset + file.View.ReadInt64 (dir_offset+9);
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if (dir_offset < 0x13 || dir_offset >= file.MaxOffset)
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return null;
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}
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int header_type = file.View.ReadByte (dir_offset);
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if (0 != header_type && 1 != header_type)
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return null;
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Stream header_stream;
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if (0 == header_type) // read unpacked header
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{
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long header_size = file.View.ReadInt64 (dir_offset+1);
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if (header_size > uint.MaxValue)
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return null;
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header_stream = file.CreateStream (dir_offset+9, (uint)header_size);
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}
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else // read packed header
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{
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long packed_size = file.View.ReadInt64 (dir_offset+1);
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if (packed_size > uint.MaxValue)
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return null;
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long header_size = file.View.ReadInt64 (dir_offset+9);
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using (var input = file.CreateStream (dir_offset+17, (uint)packed_size))
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header_stream = ZLibCompressor.DeCompress (input);
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}
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var crypt_algorithm = new Lazy<ICrypt> (() => QueryCryptAlgorithm (file), false);
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var dir = new List<Entry>();
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dir_offset = 0;
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using (var header = new BinaryReader (header_stream, Encoding.Unicode))
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using (var filename_map = new FilenameMap())
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{
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while (-1 != header.PeekChar())
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{
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uint entry_signature = header.ReadUInt32();
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long entry_size = header.ReadInt64();
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if (entry_size < 0)
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return null;
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dir_offset += 12 + entry_size;
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if (0x656C6946 == entry_signature) // "File"
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{
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var entry = new Xp3Entry();
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while (entry_size > 0)
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{
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uint section = header.ReadUInt32();
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long section_size = header.ReadInt64();
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entry_size -= 12;
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if (section_size > entry_size)
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break;
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entry_size -= section_size;
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long next_section_pos = header.BaseStream.Position + section_size;
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switch (section)
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{
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case 0x6f666e69: // "info"
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if (entry.Size != 0 || !string.IsNullOrEmpty (entry.Name))
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{
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goto NextEntry; // ambiguous entry, ignore
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}
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entry.IsEncrypted = 0 != header.ReadUInt32();
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long file_size = header.ReadInt64();
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long packed_size = header.ReadInt64();
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if (file_size >= uint.MaxValue || packed_size > uint.MaxValue || packed_size > file.MaxOffset)
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{
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goto NextEntry;
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}
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entry.IsPacked = file_size != packed_size;
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entry.Size = (uint)packed_size;
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entry.UnpackedSize = (uint)file_size;
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if (entry.IsEncrypted || ForceEncryptionQuery)
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entry.Cipher = crypt_algorithm.Value;
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else
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entry.Cipher = NoCryptAlgorithm;
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var name = entry.Cipher.ReadName (header);
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if (null == name)
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{
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goto NextEntry;
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}
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if (entry.Cipher.ObfuscatedIndex && ObfuscatedPathRe.IsMatch (name))
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{
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goto NextEntry;
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}
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if (filename_map.Count > 0)
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name = filename_map.Get (entry.Hash, name);
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if (name.Length > 0x100)
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{
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goto NextEntry;
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}
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entry.Name = name;
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entry.Type = FormatCatalog.Instance.GetTypeFromName (name);
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entry.IsEncrypted = !(entry.Cipher is NoCrypt)
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&& !(entry.Cipher.StartupTjsNotEncrypted && "startup.tjs" == name);
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break;
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case 0x6d676573: // "segm"
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int segment_count = (int)(section_size / 0x1c);
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if (segment_count > 0)
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{
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for (int i = 0; i < segment_count; ++i)
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{
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bool compressed = 0 != header.ReadInt32();
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long segment_offset = base_offset+header.ReadInt64();
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long segment_size = header.ReadInt64();
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long segment_packed_size = header.ReadInt64();
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if (segment_offset > file.MaxOffset || segment_packed_size > file.MaxOffset)
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{
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goto NextEntry;
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}
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var segment = new Xp3Segment {
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IsCompressed = compressed,
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Offset = segment_offset,
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Size = (uint)segment_size,
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PackedSize = (uint)segment_packed_size
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};
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entry.Segments.Add (segment);
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}
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entry.Offset = entry.Segments.First().Offset;
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}
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break;
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case 0x726c6461: // "adlr"
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if (4 == section_size)
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entry.Hash = header.ReadUInt32();
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break;
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default: // unknown section
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break;
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}
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header.BaseStream.Position = next_section_pos;
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}
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if (!string.IsNullOrEmpty (entry.Name) && entry.Segments.Any())
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{
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if (entry.Cipher.ObfuscatedIndex)
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{
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DeobfuscateEntry (entry);
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}
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dir.Add (entry);
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}
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}
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else if (entry_size > 7)
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{
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// 0x6E666E68 == entry_signature // "hnfn"
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// 0x6C696D73 == entry_signature // "smil"
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// 0x46696C65 == entry_signature // "eliF"
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// 0x757A7559 == entry_signature // "Yuzu"
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uint hash = header.ReadUInt32();
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int name_size = header.ReadInt16();
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if (name_size > 0)
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{
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entry_size -= 6;
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if (name_size * 2 <= entry_size)
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{
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var filename = new string (header.ReadChars (name_size));
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filename_map.Add (hash, filename);
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}
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}
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}
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NextEntry:
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header.BaseStream.Position = dir_offset;
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}
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}
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if (0 == dir.Count)
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return null;
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var arc = new ArcFile (file, this, dir);
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try
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{
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if (crypt_algorithm.IsValueCreated)
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crypt_algorithm.Value.Init (arc);
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return arc;
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}
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catch
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{
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arc.Dispose();
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throw;
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}
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}
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static readonly Regex ObfuscatedPathRe = new Regex (@"[^\\/]+[\\/]\.\.[\\/]");
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private static void DeobfuscateEntry (Xp3Entry entry)
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{
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if (entry.Segments.Count > 1)
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entry.Segments.RemoveRange (1, entry.Segments.Count-1);
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entry.IsPacked = entry.Segments[0].IsCompressed;
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entry.Size = entry.Segments[0].PackedSize;
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entry.UnpackedSize = entry.Segments[0].Size;
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}
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internal static long SkipExeHeader (ArcView file, byte[] signature)
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{
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var exe = new ExeFile (file);
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if (exe.ContainsSection (".rsrc"))
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{
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var offset = exe.FindString (exe.Sections[".rsrc"], signature);
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if (offset != -1 && 0 != file.View.ReadUInt32 (offset+signature.Length))
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return offset;
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}
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var section = exe.Overlay;
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while (section.Offset < file.MaxOffset)
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{
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var offset = exe.FindString (section, signature, 0x10);
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if (-1 == offset)
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break;
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if (0 != file.View.ReadUInt32 (offset+signature.Length))
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return offset;
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section.Offset = offset + 0x10;
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section.Size = (uint)(file.MaxOffset - section.Offset);
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}
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return 0;
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}
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public override Stream OpenEntry (ArcFile arc, Entry entry)
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{
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var xp3_entry = entry as Xp3Entry;
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if (null == xp3_entry)
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return arc.File.CreateStream (entry.Offset, entry.Size);
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Stream input;
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if (1 == xp3_entry.Segments.Count && !xp3_entry.IsEncrypted)
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{
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var segment = xp3_entry.Segments.First();
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if (segment.IsCompressed)
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input = new ZLibStream (arc.File.CreateStream (segment.Offset, segment.PackedSize),
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CompressionMode.Decompress);
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else
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input = arc.File.CreateStream (segment.Offset, segment.Size);
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}
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else
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input = new Xp3Stream (arc.File, xp3_entry);
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return xp3_entry.Cipher.EntryReadFilter (xp3_entry, input);
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}
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public override ResourceOptions GetDefaultOptions ()
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{
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return new Xp3Options {
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Version = Settings.Default.XP3Version,
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Scheme = GetScheme (Settings.Default.XP3Scheme),
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CompressIndex = Settings.Default.XP3CompressHeader,
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CompressContents = Settings.Default.XP3CompressContents,
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RetainDirs = Settings.Default.XP3RetainStructure,
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};
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}
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public override object GetCreationWidget ()
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{
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return new GUI.CreateXP3Widget();
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}
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public override object GetAccessWidget ()
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{
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return new GUI.WidgetXP3();
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}
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ICrypt QueryCryptAlgorithm (ArcView file)
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{
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var alg = GuessCryptAlgorithm (file);
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if (null != alg)
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return alg;
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var options = Query<Xp3Options> (arcStrings.XP3EncryptedNotice);
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return options.Scheme;
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}
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public static ICrypt GetScheme (string scheme)
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{
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ICrypt algorithm;
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if (string.IsNullOrEmpty (scheme) || !KnownSchemes.TryGetValue (scheme, out algorithm))
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algorithm = NoCryptAlgorithm;
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return algorithm;
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}
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static uint GetFileCheckSum (Stream src)
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{
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// compute file checksum via adler32.
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// src's file pointer should be reset to zero.
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var sum = new Adler32();
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byte[] buf = new byte[64*1024];
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for (;;)
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{
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int read = src.Read (buf, 0, buf.Length);
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if (0 == read) break;
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sum.Update (buf, 0, read);
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}
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return sum.Value;
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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 xp3_options = GetOptions<Xp3Options> (options);
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ICrypt scheme = xp3_options.Scheme;
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bool compress_index = xp3_options.CompressIndex;
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bool compress_contents = xp3_options.CompressContents;
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bool retain_dirs = xp3_options.RetainDirs;
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bool use_encryption = !(scheme is NoCrypt);
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using (var writer = new BinaryWriter (output, Encoding.ASCII, true))
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{
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writer.Write (s_xp3_header);
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if (2 == xp3_options.Version)
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{
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writer.Write ((long)0x17);
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writer.Write ((int)1);
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writer.Write ((byte)0x80);
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writer.Write ((long)0);
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}
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long index_pos_offset = writer.BaseStream.Position;
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writer.BaseStream.Seek (8, SeekOrigin.Current);
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int callback_count = 0;
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var used_names = new HashSet<string>();
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var dir = new List<Xp3Entry>();
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long current_offset = writer.BaseStream.Position;
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foreach (var entry in list)
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{
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if (null != callback)
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callback (callback_count++, entry, arcStrings.MsgAddingFile);
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string name = entry.Name;
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if (!retain_dirs)
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name = Path.GetFileName (name);
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else
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name = name.Replace (@"\", "/");
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if (!used_names.Add (name))
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{
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Trace.WriteLine ("duplicate name", entry.Name);
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continue;
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}
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var xp3entry = new Xp3Entry {
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Name = name,
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Cipher = scheme,
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IsEncrypted = use_encryption
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&& !(scheme.StartupTjsNotEncrypted && VFS.IsPathEqualsToFileName (name, "startup.tjs"))
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};
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bool compress = compress_contents && ShouldCompressFile (entry);
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using (var file = File.Open (name, FileMode.Open, FileAccess.Read))
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{
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if (!xp3entry.IsEncrypted || 0 == file.Length)
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RawFileCopy (file, xp3entry, output, compress);
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else
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EncryptedFileCopy (file, xp3entry, output, compress);
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}
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dir.Add (xp3entry);
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}
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long index_pos = writer.BaseStream.Position;
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writer.BaseStream.Position = index_pos_offset;
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writer.Write (index_pos);
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writer.BaseStream.Position = index_pos;
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using (var header = new BinaryWriter (new MemoryStream (dir.Count*0x58), Encoding.Unicode))
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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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long dir_pos = 0;
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foreach (var entry in dir)
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{
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header.BaseStream.Position = dir_pos;
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header.Write ((uint)0x656c6946); // "File"
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long header_size_pos = header.BaseStream.Position;
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header.Write ((long)0);
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header.Write ((uint)0x6f666e69); // "info"
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header.Write ((long)(4+8+8+2 + entry.Name.Length*2));
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header.Write ((uint)(use_encryption ? 0x80000000 : 0));
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header.Write ((long)entry.UnpackedSize);
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header.Write ((long)entry.Size);
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header.Write ((short)entry.Name.Length);
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foreach (char c in entry.Name)
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header.Write (c);
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header.Write ((uint)0x6d676573); // "segm"
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header.Write ((long)0x1c);
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var segment = entry.Segments.First();
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header.Write ((int)(segment.IsCompressed ? 1 : 0));
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header.Write ((long)segment.Offset);
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header.Write ((long)segment.Size);
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header.Write ((long)segment.PackedSize);
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header.Write ((uint)0x726c6461); // "adlr"
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header.Write ((long)4);
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header.Write ((uint)entry.Hash);
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dir_pos = header.BaseStream.Position;
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long header_size = dir_pos - header_size_pos - 8;
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header.BaseStream.Position = header_size_pos;
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header.Write (header_size);
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}
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header.BaseStream.Position = 0;
|
|
writer.Write (compress_index);
|
|
long unpacked_dir_size = header.BaseStream.Length;
|
|
if (compress_index)
|
|
{
|
|
if (null != callback)
|
|
callback (callback_count++, null, arcStrings.MsgCompressingIndex);
|
|
|
|
long packed_dir_size_pos = writer.BaseStream.Position;
|
|
writer.Write ((long)0);
|
|
writer.Write (unpacked_dir_size);
|
|
|
|
long dir_start = writer.BaseStream.Position;
|
|
using (var zstream = new ZLibStream (writer.BaseStream, CompressionMode.Compress,
|
|
CompressionLevel.Level9, true))
|
|
header.BaseStream.CopyTo (zstream);
|
|
|
|
long packed_dir_size = writer.BaseStream.Position - dir_start;
|
|
writer.BaseStream.Position = packed_dir_size_pos;
|
|
writer.Write (packed_dir_size);
|
|
}
|
|
else
|
|
{
|
|
writer.Write (unpacked_dir_size);
|
|
header.BaseStream.CopyTo (writer.BaseStream);
|
|
}
|
|
}
|
|
}
|
|
output.Seek (0, SeekOrigin.End);
|
|
}
|
|
|
|
void RawFileCopy (FileStream file, Xp3Entry xp3entry, Stream output, bool compress)
|
|
{
|
|
if (file.Length > uint.MaxValue)
|
|
throw new FileSizeException();
|
|
|
|
uint unpacked_size = (uint)file.Length;
|
|
xp3entry.UnpackedSize = (uint)unpacked_size;
|
|
xp3entry.Size = (uint)unpacked_size;
|
|
compress = compress && unpacked_size > 0;
|
|
var segment = new Xp3Segment {
|
|
IsCompressed = compress,
|
|
Offset = output.Position,
|
|
Size = unpacked_size,
|
|
PackedSize = unpacked_size
|
|
};
|
|
if (compress)
|
|
{
|
|
var start = output.Position;
|
|
using (var zstream = new ZLibStream (output, CompressionMode.Compress, CompressionLevel.Level9, true))
|
|
{
|
|
xp3entry.Hash = CheckedCopy (file, zstream);
|
|
}
|
|
segment.PackedSize = (uint)(output.Position - start);
|
|
xp3entry.Size = segment.PackedSize;
|
|
}
|
|
else
|
|
{
|
|
xp3entry.Hash = CheckedCopy (file, output);
|
|
}
|
|
xp3entry.Segments.Add (segment);
|
|
}
|
|
|
|
void EncryptedFileCopy (FileStream file, Xp3Entry xp3entry, Stream output, bool compress)
|
|
{
|
|
if (file.Length > int.MaxValue)
|
|
throw new FileSizeException();
|
|
|
|
using (var map = MemoryMappedFile.CreateFromFile (file, null, 0,
|
|
MemoryMappedFileAccess.Read, null, HandleInheritability.None, true))
|
|
{
|
|
uint unpacked_size = (uint)file.Length;
|
|
xp3entry.UnpackedSize = (uint)unpacked_size;
|
|
xp3entry.Size = (uint)unpacked_size;
|
|
using (var view = map.CreateViewAccessor (0, unpacked_size, MemoryMappedFileAccess.Read))
|
|
{
|
|
var segment = new Xp3Segment {
|
|
IsCompressed = compress,
|
|
Offset = output.Position,
|
|
Size = unpacked_size,
|
|
PackedSize = unpacked_size,
|
|
};
|
|
if (compress)
|
|
{
|
|
output = new ZLibStream (output, CompressionMode.Compress, CompressionLevel.Level9, true);
|
|
}
|
|
unsafe
|
|
{
|
|
byte[] read_buffer = new byte[81920];
|
|
byte* ptr = view.GetPointer (0);
|
|
try
|
|
{
|
|
var checksum = new Adler32();
|
|
bool hash_after_crypt = xp3entry.Cipher.HashAfterCrypt;
|
|
if (!hash_after_crypt)
|
|
xp3entry.Hash = checksum.Update (ptr, (int)unpacked_size);
|
|
int offset = 0;
|
|
int remaining = (int)unpacked_size;
|
|
while (remaining > 0)
|
|
{
|
|
int amount = Math.Min (remaining, read_buffer.Length);
|
|
remaining -= amount;
|
|
Marshal.Copy ((IntPtr)(ptr+offset), read_buffer, 0, amount);
|
|
xp3entry.Cipher.Encrypt (xp3entry, offset, read_buffer, 0, amount);
|
|
if (hash_after_crypt)
|
|
checksum.Update (read_buffer, 0, amount);
|
|
output.Write (read_buffer, 0, amount);
|
|
offset += amount;
|
|
}
|
|
if (hash_after_crypt)
|
|
xp3entry.Hash = checksum.Value;
|
|
}
|
|
finally
|
|
{
|
|
view.SafeMemoryMappedViewHandle.ReleasePointer();
|
|
if (compress)
|
|
{
|
|
var dest = (output as ZLibStream).BaseStream;
|
|
output.Dispose();
|
|
segment.PackedSize = (uint)(dest.Position - segment.Offset);
|
|
xp3entry.Size = segment.PackedSize;
|
|
}
|
|
xp3entry.Segments.Add (segment);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
uint CheckedCopy (Stream src, Stream dst)
|
|
{
|
|
var checksum = new Adler32();
|
|
var read_buffer = new byte[81920];
|
|
for (;;)
|
|
{
|
|
int read = src.Read (read_buffer, 0, read_buffer.Length);
|
|
if (0 == read)
|
|
break;
|
|
checksum.Update (read_buffer, 0, read);
|
|
dst.Write (read_buffer, 0, read);
|
|
}
|
|
return checksum.Value;
|
|
}
|
|
|
|
bool ShouldCompressFile (Entry entry)
|
|
{
|
|
if ("image" == entry.Type || "archive" == entry.Type)
|
|
return false;
|
|
if (entry.Name.HasExtension (".ogg"))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
ICrypt GuessCryptAlgorithm (ArcView file)
|
|
{
|
|
var title = FormatCatalog.Instance.LookupGame (file.Name);
|
|
if (string.IsNullOrEmpty (title))
|
|
return null;
|
|
ICrypt algorithm;
|
|
if (!KnownSchemes.TryGetValue (title, out algorithm) && NoCryptTitles.Contains (title))
|
|
algorithm = NoCryptAlgorithm;
|
|
return algorithm;
|
|
}
|
|
|
|
static Xp3Scheme KiriKiriScheme = new Xp3Scheme
|
|
{
|
|
KnownSchemes = new Dictionary<string, ICrypt>(),
|
|
NoCryptTitles = new HashSet<string>()
|
|
};
|
|
|
|
public static IDictionary<string, ICrypt> KnownSchemes
|
|
{
|
|
get { return KiriKiriScheme.KnownSchemes; }
|
|
}
|
|
|
|
public static ISet<string> NoCryptTitles
|
|
{
|
|
get { return KiriKiriScheme.NoCryptTitles; }
|
|
}
|
|
|
|
public override ResourceScheme Scheme
|
|
{
|
|
get { return KiriKiriScheme; }
|
|
set { KiriKiriScheme = (Xp3Scheme)value; }
|
|
}
|
|
}
|
|
|
|
internal class Xp3Stream : Stream
|
|
{
|
|
ArcView m_file;
|
|
Xp3Entry m_entry;
|
|
IEnumerator<Xp3Segment> m_segment;
|
|
Stream m_stream;
|
|
long m_offset = 0;
|
|
bool m_eof = false;
|
|
|
|
public override bool CanRead { get { return !disposed; } }
|
|
public override bool CanSeek { get { return false; } }
|
|
public override bool CanWrite { get { return false; } }
|
|
public override long Length { get { return m_entry.UnpackedSize; } }
|
|
public override long Position
|
|
{
|
|
get { return m_offset; }
|
|
set { throw new NotSupportedException ("Xp3Stream.Position not supported."); }
|
|
}
|
|
|
|
public Xp3Stream (ArcView file, Xp3Entry entry)
|
|
{
|
|
m_file = file;
|
|
m_entry = entry;
|
|
m_segment = entry.Segments.GetEnumerator();
|
|
NextSegment();
|
|
}
|
|
|
|
private void NextSegment ()
|
|
{
|
|
if (!m_segment.MoveNext())
|
|
{
|
|
m_eof = true;
|
|
return;
|
|
}
|
|
if (null != m_stream)
|
|
m_stream.Dispose();
|
|
var segment = m_segment.Current;
|
|
var segment_size = segment.IsCompressed ? segment.PackedSize : segment.Size;
|
|
m_stream = m_file.CreateStream (segment.Offset, segment_size);
|
|
if (segment.IsCompressed)
|
|
m_stream = new ZLibStream (m_stream, CompressionMode.Decompress);
|
|
}
|
|
|
|
public override int Read (byte[] buffer, int offset, int count)
|
|
{
|
|
int total = 0;
|
|
while (!m_eof && count > 0)
|
|
{
|
|
int read = m_stream.Read (buffer, offset, count);
|
|
if (0 != read)
|
|
{
|
|
if (m_entry.IsEncrypted)
|
|
m_entry.Cipher.Decrypt (m_entry, m_offset, buffer, offset, read);
|
|
m_offset += read;
|
|
total += read;
|
|
offset += read;
|
|
count -= read;
|
|
}
|
|
if (0 != count)
|
|
NextSegment();
|
|
}
|
|
return total;
|
|
}
|
|
|
|
public override int ReadByte ()
|
|
{
|
|
int b = -1;
|
|
while (!m_eof)
|
|
{
|
|
b = m_stream.ReadByte();
|
|
if (-1 != b)
|
|
{
|
|
if (m_entry.IsEncrypted)
|
|
b = m_entry.Cipher.Decrypt (m_entry, m_offset++, (byte)b);
|
|
break;
|
|
}
|
|
NextSegment();
|
|
}
|
|
return b;
|
|
}
|
|
|
|
public override void Flush ()
|
|
{
|
|
}
|
|
|
|
public override long Seek (long offset, SeekOrigin origin)
|
|
{
|
|
throw new NotSupportedException ("Xp3Stream.Seek method is not supported");
|
|
}
|
|
|
|
public override void SetLength (long length)
|
|
{
|
|
throw new NotSupportedException ("Xp3Stream.SetLength method is not supported");
|
|
}
|
|
|
|
public override void Write (byte[] buffer, int offset, int count)
|
|
{
|
|
throw new NotSupportedException ("Xp3Stream.Write method is not supported");
|
|
}
|
|
|
|
public override void WriteByte (byte value)
|
|
{
|
|
throw new NotSupportedException("Xp3Stream.WriteByte method is not supported");
|
|
}
|
|
|
|
#region IDisposable Members
|
|
bool disposed = false;
|
|
protected override void Dispose (bool disposing)
|
|
{
|
|
if (!disposed)
|
|
{
|
|
if (disposing)
|
|
{
|
|
if (null != m_stream)
|
|
m_stream.Dispose();
|
|
m_segment.Dispose();
|
|
}
|
|
disposed = true;
|
|
base.Dispose (disposing);
|
|
}
|
|
}
|
|
#endregion
|
|
}
|
|
|
|
/// <summary>
|
|
/// Class that maps file hashes to filenames.
|
|
/// </summary>
|
|
internal sealed class FilenameMap : IDisposable
|
|
{
|
|
Dictionary<uint, string> m_hash_map = new Dictionary<uint, string>();
|
|
Dictionary<string, string> m_md5_map = new Dictionary<string, string>();
|
|
MD5 m_md5 = MD5.Create();
|
|
StringBuilder m_md5_str = new StringBuilder();
|
|
|
|
public int Count { get { return m_md5_map.Count; } }
|
|
|
|
public void Add (uint hash, string filename)
|
|
{
|
|
if (!m_hash_map.ContainsKey (hash))
|
|
m_hash_map[hash] = filename;
|
|
|
|
m_md5_map[GetMd5Hash (filename)] = filename;
|
|
}
|
|
|
|
public string Get (uint hash, string md5)
|
|
{
|
|
string filename;
|
|
if (m_md5_map.TryGetValue (md5, out filename))
|
|
return filename;
|
|
if (m_hash_map.TryGetValue (hash, out filename))
|
|
return filename;
|
|
return md5;
|
|
}
|
|
|
|
string GetMd5Hash (string text)
|
|
{
|
|
var text_bytes = Encoding.Unicode.GetBytes (text.ToLowerInvariant());
|
|
var md5 = m_md5.ComputeHash (text_bytes);
|
|
m_md5_str.Clear();
|
|
for (int i = 0; i < md5.Length; ++i)
|
|
m_md5_str.AppendFormat ("{0:x2}", md5[i]);
|
|
return m_md5_str.ToString();
|
|
}
|
|
|
|
bool _disposed = false;
|
|
public void Dispose ()
|
|
{
|
|
if (!_disposed)
|
|
{
|
|
m_md5.Dispose();
|
|
_disposed = true;
|
|
}
|
|
}
|
|
}
|
|
}
|