mirror of
https://github.com/crskycode/GARbro.git
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238 lines
9.0 KiB
C#
238 lines
9.0 KiB
C#
//! \file ArcNitro.cs
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//! \date Wed Feb 25 20:28:14 2015
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//! \brief Nitro+ PAK archives implementation.
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//
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// Copyright (C) 2015-2016 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.Collections.Generic;
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using System.ComponentModel.Composition;
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using System.IO;
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using System.Text;
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using GameRes.Compression;
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using GameRes.Utility;
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namespace GameRes.Formats.NitroPlus
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{
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internal class PakEntry : Entry
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{
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public uint Key;
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}
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internal class NitroPak : ArcFile
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{
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public int Version;
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public NitroPak (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, int version)
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: base (arc, impl, dir)
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{
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Version = version;
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}
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}
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[Export(typeof(ArchiveFormat))]
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public class PakOpener : ArchiveFormat
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{
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public override string Tag { get { return "PAK/NITRO+"; } }
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public override string Description { get { return "Nitro+ resource archive"; } }
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public override uint Signature { get { return 0x03; } }
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public override bool IsHierarchic { get { return true; } }
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public override bool CanCreate { get { return false; } }
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public PakOpener ()
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{
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Extensions = new string[] { "pak" };
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Signatures = new uint[] { 2, 3 };
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}
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public override ArcFile TryOpen (ArcView file)
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{
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int version = file.View.ReadInt32 (0);
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List<Entry> dir = null;
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if (2 == version)
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dir = OpenPakV2 (file);
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else if (3 == version)
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dir = OpenPakV3 (file);
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if (null == dir)
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return null;
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return new NitroPak (file, this, dir, version);
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}
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private List<Entry> OpenPakV2 (ArcView file)
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{
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int count = file.View.ReadInt32 (4);
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if (!IsSaneCount (count))
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return null;
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int unpacked_size = file.View.ReadInt32 (8);
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uint packed_size = file.View.ReadUInt32 (0xC);
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var input = file.CreateStream (0x114, packed_size);
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using (var header_stream = new ZLibStream (input, CompressionMode.Decompress))
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using (var header = new BinaryReader (header_stream, Encoding.ASCII, true))
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{
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long base_offset = 0x114 + packed_size;
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var name_buf = new byte[0x40];
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var dir = new List<Entry> (count);
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for (int i = 0; i < count; ++i)
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{
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int name_length = header.ReadInt32();
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if (name_length <= 0)
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return null;
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if (name_length > name_buf.Length)
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name_buf = new byte[name_length];
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if (name_length != header.Read (name_buf, 0, name_length))
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return null;
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var name = Encodings.cp932.GetString (name_buf, 0, name_length);
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var entry = FormatCatalog.Instance.Create<PackedEntry> (name);
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entry.Offset = base_offset + header.ReadUInt32();
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entry.UnpackedSize = header.ReadUInt32();
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entry.Size = header.ReadUInt32();
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entry.IsPacked = header.ReadInt32() != 0;
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uint psize = header.ReadUInt32();
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if (entry.IsPacked)
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entry.Size = psize;
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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dir.Add (entry);
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}
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return dir;
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}
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}
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private List<Entry> OpenPakV3 (ArcView file)
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{
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if (0x110 > file.View.Reserve (4, 0x110))
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return null;
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uint size_xor = file.View.ReadUInt32 (0x104);
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if (0x64 != size_xor)
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return null;
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byte[] name_buf = file.View.ReadBytes (4, 0x100);
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int name_len = 0;
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for (int i = 0; i < name_buf.Length; ++i)
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{
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if (0 == name_buf[i])
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break;
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if (name_buf[i] >= 0x80 || name_buf[i] < 0x20)
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return null;
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++name_len;
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}
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if (0 == name_len || name_len > 0x10)
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return null;
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uint header_key = GetKey (name_buf, name_len);
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uint unpacked = file.View.ReadUInt32 (0x108) ^ header_key;
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int count = (int)(file.View.ReadUInt32 (0x10c) ^ header_key);
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if (!IsSaneCount (count))
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return null;
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var dir = new List<Entry> (count);
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uint header_size = file.View.ReadUInt32 (0x110) ^ size_xor;
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long base_offset = 0x114 + header_size;
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var input = file.CreateStream (0x114, header_size);
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using (var header_stream = new ZLibStream (input, CompressionMode.Decompress))
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using (var header = new BinaryReader (header_stream, Encoding.ASCII, true))
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{
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for (int i = 0; i < count; ++i)
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{
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name_len = header.ReadInt32();
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if (name_len <= 0 || name_len > name_buf.Length)
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return null;
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if (name_len != header.Read (name_buf, 0, name_len))
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return null;
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uint key = GetKey (name_buf, name_len);
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uint offset = header.ReadUInt32() ^ key;
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uint size = header.ReadUInt32() ^ key;
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uint val1 = header.ReadUInt32() ^ key;
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uint val2 = header.ReadUInt32() ^ key;
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uint val3 = header.ReadUInt32() ^ key;
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var entry = new PakEntry {
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Name = Encodings.cp932.GetString (name_buf, 0, name_len),
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Offset = base_offset+offset,
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Size = size,
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Key = key,
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};
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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entry.Type = FormatCatalog.Instance.GetTypeFromName (entry.Name);
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dir.Add (entry);
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}
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return dir;
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}
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}
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static uint GetKey (byte[] name, int length)
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{
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int key = 0;
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for (int i = 0; i < length; ++i)
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{
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key *= 0x89;
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key += (sbyte)name[i];
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}
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return (uint)key;
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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 pak_entry = entry as PakEntry;
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if (pak_entry != null)
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return OpenV3Entry (arc, pak_entry);
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var packed_entry = entry as PackedEntry;
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if (packed_entry != null && packed_entry.IsPacked)
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return UnpackV2Entry (arc, packed_entry);
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return arc.File.CreateStream (entry.Offset, entry.Size);
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}
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private Stream UnpackV2Entry (ArcFile arc, PackedEntry entry)
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{
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var input = arc.File.CreateStream (entry.Offset, entry.Size);
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try
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{
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return new ZLibStream (input, CompressionMode.Decompress);
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}
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catch
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{
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input.Dispose();
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throw;
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}
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}
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private Stream OpenV3Entry (ArcFile arc, PakEntry entry)
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{
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uint enc_size = Math.Min (entry.Size, 0x10u);
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if (0 == enc_size)
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return Stream.Null;
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var buf = arc.File.View.ReadBytes (entry.Offset, enc_size);
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uint key = entry.Key;
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for (int i = 0; i < buf.Length; ++i)
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{
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buf[i] ^= (byte)key;
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key = Binary.RotR (key, 8);
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}
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if (enc_size == entry.Size)
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return new MemoryStream (buf, false);
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return new PrefixStream (buf, arc.File.CreateStream (entry.Offset+enc_size, entry.Size-enc_size));
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}
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}
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}
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