mirror of
https://github.com/crskycode/GARbro.git
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850 lines
34 KiB
C#
850 lines
34 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) 2014-2016 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.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 Dictionary<string, ICrypt> KnownSchemes;
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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 CanCreate { 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 string SignatureBytes = "XP3\x0d\x0a\x20\x0a\x1a\x8b\x67\x01";
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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 override ResourceScheme Scheme
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{
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get { return new Xp3Scheme { KnownSchemes = KnownSchemes }; }
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set { KnownSchemes = ((Xp3Scheme)value).KnownSchemes; }
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}
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public bool ForceEncryptionQuery = true;
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private static readonly ICrypt NoCryptAlgorithm = new NoCrypt();
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public static Dictionary<string, ICrypt> KnownSchemes = new Dictionary<string, ICrypt>();
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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);
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if (!file.View.AsciiEqual (base_offset, SignatureBytes))
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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);
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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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{
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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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if (0x656c6946 != entry_signature) // "File"
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{
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break;
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}
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long entry_size = header.ReadInt64();
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dir_offset += 12 + entry_size;
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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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{
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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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int name_size = header.ReadInt16();
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if (name_size > 0x100 || name_size <= 0)
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{
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goto NextEntry;
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}
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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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entry.IsEncrypted = !(entry.Cipher is NoCrypt);
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var name = new string (header.ReadChars (name_size));
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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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entry.Name = name;
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entry.Type = FormatCatalog.Instance.GetTypeFromName (entry.Name);
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break;
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}
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case 0x6d676573: // "segm"
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{
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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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}
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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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NextEntry:
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header.BaseStream.Position = dir_offset;
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}
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}
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return new ArcFile (file, this, dir);
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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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private long SkipExeHeader (ArcView file)
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{
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long offset = 0x10;
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long pe_offset = file.View.ReadUInt32 (0x3c);
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if (pe_offset < file.MaxOffset && 0x4550 == file.View.ReadUInt32 (pe_offset)) // 'PE'
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{
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int opt_header = file.View.ReadUInt16 (pe_offset+0x14); // SizeOfOptionalHeader
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offset = file.View.ReadUInt32 (pe_offset+0x54); // SizeOfHeaders
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long section_table = pe_offset+opt_header+0x18;
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int count = file.View.ReadUInt16 (pe_offset+6); // NumberOfSections
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if (section_table + 0x28*count < file.MaxOffset)
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{
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for (int i = 0; i < count; ++i)
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{
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uint size = file.View.ReadUInt32 (section_table+0x10);
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uint addr = file.View.ReadUInt32 (section_table+0x14);
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if (file.View.AsciiEqual (section_table, ".rsrc\0"))
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{
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// look within EXE resource section
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offset = addr;
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break;
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}
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section_table += 0x28;
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if (0 != size)
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offset = Math.Max ((long)addr + size, offset);
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}
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}
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}
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unsafe
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{
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while (offset < file.MaxOffset)
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{
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uint page_size = (uint)Math.Min (0x10000L, file.MaxOffset - offset);
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if (page_size < 0x20)
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break;
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using (var view = file.CreateViewAccessor (offset, page_size))
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{
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byte* page_begin = view.GetPointer (offset);
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byte* page_end = page_begin + page_size - 0x10;
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try {
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for (byte* ptr = page_begin; ptr != page_end; ++ptr)
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{
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// TODO: search every byte only when inside resource section,
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// otherwise stick to paragraph boundary.
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int i = 0;
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while (ptr[i] == s_xp3_header[i])
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{
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if (++i == s_xp3_header.Length)
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{
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// check whether index offset is non-zero
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if (0 == *(uint*)(ptr+i))
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break;
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return offset + (ptr - page_begin);
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}
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}
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}
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}
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finally {
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view.SafeMemoryMappedViewHandle.ReleasePointer();
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}
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}
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offset += page_size - 0x10;
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}
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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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if (entry.Size <= 5 || "image" == entry.Type || "audio" == entry.Type)
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return input;
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var header = new byte[5];
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input.Read (header, 0, 5);
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if (0xFE == header[0] && 0xFE == header[1] && header[2] < 3 && 0xFF == header[3] && 0xFE == header[4])
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return DecryptScript (header[2], input, xp3_entry.UnpackedSize);
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if (!input.CanSeek)
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return new PrefixStream (header, input);
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input.Position = 0;
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return input;
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}
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Stream DecryptScript (int enc_type, Stream input, uint unpacked_size)
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{
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using (var reader = new BinaryReader (input, Encoding.Unicode, true))
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{
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if (2 == enc_type)
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{
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reader.ReadInt64(); // packed_size
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reader.ReadInt64(); // unpacked_size
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return new ZLibStream (input, CompressionMode.Decompress);
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}
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var output = new MemoryStream ((int)unpacked_size+2);
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using (var writer = new BinaryWriter (output, Encoding.Unicode, true))
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{
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writer.Write ('\xFEFF'); // BOM
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int c;
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if (1 == enc_type)
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{
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while ((c = reader.Read()) != -1)
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{
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c = (c & 0xAAAA) >> 1 | (c & 0x5555) << 1;
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writer.Write ((char)c);
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}
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}
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else
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{
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while ((c = reader.Read()) != -1)
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{
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if (c >= 0x20)
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{
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c = c ^ (((c & 0xFE) << 8) ^ 1);
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writer.Write ((char)c);
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}
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}
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}
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}
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output.Position = 0;
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input.Dispose();
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return output;
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}
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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 ()
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{
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var options = Query<Xp3Options> (arcStrings.ArcEncryptedNotice);
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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 != NoCryptAlgorithm;
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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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IsEncrypted = use_encryption,
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Cipher = scheme,
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};
|
|
bool compress = compress_contents && ShouldCompressFile (entry);
|
|
using (var file = File.Open (name, FileMode.Open, FileAccess.Read))
|
|
{
|
|
if (!use_encryption || 0 == file.Length)
|
|
RawFileCopy (file, xp3entry, output, compress);
|
|
else
|
|
EncryptedFileCopy (file, xp3entry, output, compress);
|
|
}
|
|
|
|
dir.Add (xp3entry);
|
|
}
|
|
|
|
long index_pos = writer.BaseStream.Position;
|
|
writer.BaseStream.Position = index_pos_offset;
|
|
writer.Write (index_pos);
|
|
writer.BaseStream.Position = index_pos;
|
|
|
|
using (var header = new BinaryWriter (new MemoryStream (dir.Count*0x58), Encoding.Unicode))
|
|
{
|
|
if (null != callback)
|
|
callback (callback_count++, null, arcStrings.MsgWritingIndex);
|
|
|
|
long dir_pos = 0;
|
|
foreach (var entry in dir)
|
|
{
|
|
header.BaseStream.Position = dir_pos;
|
|
header.Write ((uint)0x656c6946); // "File"
|
|
long header_size_pos = header.BaseStream.Position;
|
|
header.Write ((long)0);
|
|
header.Write ((uint)0x6f666e69); // "info"
|
|
header.Write ((long)(4+8+8+2 + entry.Name.Length*2));
|
|
header.Write ((uint)(use_encryption ? 0x80000000 : 0));
|
|
header.Write ((long)entry.UnpackedSize);
|
|
header.Write ((long)entry.Size);
|
|
|
|
header.Write ((short)entry.Name.Length);
|
|
foreach (char c in entry.Name)
|
|
header.Write (c);
|
|
|
|
header.Write ((uint)0x6d676573); // "segm"
|
|
header.Write ((long)0x1c);
|
|
var segment = entry.Segments.First();
|
|
header.Write ((int)(segment.IsCompressed ? 1 : 0));
|
|
header.Write ((long)segment.Offset);
|
|
header.Write ((long)segment.Size);
|
|
header.Write ((long)segment.PackedSize);
|
|
|
|
header.Write ((uint)0x726c6461); // "adlr"
|
|
header.Write ((long)4);
|
|
header.Write ((uint)entry.Hash);
|
|
|
|
dir_pos = header.BaseStream.Position;
|
|
long header_size = dir_pos - header_size_pos - 8;
|
|
header.BaseStream.Position = header_size_pos;
|
|
header.Write (header_size);
|
|
}
|
|
|
|
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,
|
|
};
|
|
xp3entry.Segments.Add (segment);
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
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.EndsWith (".ogg", StringComparison.InvariantCultureIgnoreCase))
|
|
return false;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
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 m_stream != null; } }
|
|
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)
|
|
{
|
|
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)
|
|
{
|
|
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
|
|
}
|
|
}
|