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350 lines
13 KiB
C#
350 lines
13 KiB
C#
//! \file ArcARC3.cs
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//! \date Tue Aug 30 10:57:30 2016
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//! \brief Caramel BOX resource archive.
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//
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// Copyright (C) 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.Diagnostics;
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using System.IO;
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using System.Linq;
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using System.Security.Cryptography;
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using GameRes.Utility;
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namespace GameRes.Formats.CaramelBox
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{
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internal class Arc3Entry : PackedEntry
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{
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public uint Flags;
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public bool IsEncrypted;
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}
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[Export(typeof(ArchiveFormat))]
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public class Arc3Opener : ArchiveFormat
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{
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public override string Tag { get { return "ARC3"; } }
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public override string Description { get { return "Caramel BOX resource archive"; } }
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public override uint Signature { get { return 0x33637261; } } // 'arc3'
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public override bool IsHierarchic { get { return false; } }
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public override bool CanWrite { get { return false; } }
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public Arc3Opener ()
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{
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Extensions = new string[] { "bin", "ar3", "ac3" };
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}
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public override ArcFile TryOpen (ArcView file)
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{
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int version = Binary.BigEndian (file.View.ReadInt32 (4));
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uint cluster_size = Binary.BigEndian (file.View.ReadUInt32 (0x08));
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uint base_offset = Binary.BigEndian (file.View.ReadUInt32 (0x0C));
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uint index_offset = Binary.BigEndian (file.View.ReadUInt32 (0x18));
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uint index_size = Binary.BigEndian (file.View.ReadUInt32 (0x1C));
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if (0 == index_size)
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return null;
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bool new_name = false;
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var dir = new List<Entry>();
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var name_buffer = new byte[0x10];
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long current_offset = (long)index_offset * cluster_size;
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long index_end = current_offset + index_size;
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if (index_end > file.MaxOffset)
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return null;
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// --- read index ---
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uint last_entry_offset = 0x7FFFFFFF;
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int current_name_length = 0;
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Arc3Entry prev_entry = null;
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Arc3Entry long_info = null;
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while (current_offset < index_end)
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{
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byte name_length = file.View.ReadByte (current_offset++);
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int name_offset = name_length >> 4;
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name_length &= 0xF;
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if (name_offset != 0xF)
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{
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file.View.Read (current_offset, name_buffer, name_offset, name_length);
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current_offset += name_length;
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current_name_length = name_offset+name_length;
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}
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else if (0xF == name_length)
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{
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name_buffer[current_name_length-1]++;
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}
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else if (name_length != 0)
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{
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file.View.Read (current_offset, name_buffer, 0, name_length);
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current_offset += name_length;
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current_name_length = name_length;
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new_name = true;
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}
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else
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{
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uint offset = BigEndian24 (file.View.ReadUInt32 (current_offset));
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offset = (uint)Math.Abs ((int)(offset - index_offset));
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if (offset < last_entry_offset)
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last_entry_offset = offset;
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if (prev_entry != null)
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prev_entry.Offset = (long)(last_entry_offset + base_offset) * cluster_size;
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}
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last_entry_offset = BigEndian24 (file.View.ReadUInt32 (current_offset));
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current_offset += 3;
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if (new_name)
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{
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current_offset += 3;
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new_name = false;
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}
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string name;
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if (current_name_length > 3)
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{
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name = Encodings.cp932.GetString (name_buffer, 3, current_name_length-3);
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string ext = Encodings.cp932.GetString (name_buffer, 0, 3);
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name = name + '.' + ext;
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}
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else
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name = Encodings.cp932.GetString (name_buffer, 0, current_name_length);
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var entry = new Arc3Entry { Name = name };
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entry.Offset = (long)(last_entry_offset + base_offset) * cluster_size;
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if (entry.Offset >= file.MaxOffset)
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return null;
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dir.Add (entry);
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prev_entry = entry;
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if (null == long_info && "longinfo.$$$" == name)
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long_info = entry;
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if (name.HasExtension ("lze"))
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entry.Type = "image";
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}
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// --- read attributes ---
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foreach (Arc3Entry entry in dir)
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{
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entry.Size = Binary.BigEndian (file.View.ReadUInt32 (entry.Offset+8));
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entry.Flags = Binary.BigEndian (file.View.ReadUInt32 (entry.Offset+0x14));
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entry.UnpackedSize = entry.Size;
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entry.IsEncrypted = 2 == entry.Flags;
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entry.Offset += 0x20;
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uint signature = file.View.ReadUInt32 (entry.Offset);
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if (entry.IsEncrypted)
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signature = ~signature;
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entry.IsPacked = (signature & 0xFFFF) == 0x7A6C; // 'lz'
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if (entry.IsPacked)
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{
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entry.UnpackedSize = Binary.BigEndian (file.View.ReadUInt32 (entry.Offset+2));
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if (entry.IsEncrypted)
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entry.UnpackedSize ^= 0xFFFFFFFF;
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entry.Offset += 6;
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entry.Size -= 6;
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}
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else
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{
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var res = AutoEntry.DetectFileType (signature);
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if (res != null)
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entry.Type = res.Type;
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}
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}
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var arc = new ArcFile (file, this, dir);
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try // read long filenames stored within 'longinfo.$$$', if available
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{
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if (version > 1 && long_info != null)
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{
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var name_map = ReadNameMap (arc, long_info);
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foreach (var entry in dir)
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{
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string orig_name;
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if (name_map.TryGetValue (entry.Name, out orig_name))
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entry.Name = orig_name;
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}
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}
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}
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catch { /* ignore 'longinfo.$$$' read errors */ }
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foreach (var entry in dir.Where (e => e.Name.Contains ('*')))
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entry.Name = entry.Name.Replace ('*', '＊');
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return arc;
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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 a3ent = entry as Arc3Entry;
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Stream input = arc.File.CreateStream (entry.Offset, entry.Size);
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if (null == entry)
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return input;
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if (a3ent.IsEncrypted)
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{
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input = new InputCryptoStream (input, new NotTransform());
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}
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if (!a3ent.IsPacked)
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return input;
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using (input)
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{
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var data = UnpackLze (input, a3ent.UnpackedSize);
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return new BinMemoryStream (data, entry.Name);
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}
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}
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static uint BigEndian24 (uint x)
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{
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return (x & 0xFFu) << 16 | x & 0xFF00u | (x >> 16) & 0xFFu;
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}
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byte[] UnpackLze (Stream input, uint unpacked_size)
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{
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var data = new byte[unpacked_size];
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var header = new byte[4];
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int dst = 0;
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using (var bits = new LzBitStream (input, true))
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{
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while (dst < data.Length)
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{
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if (4 != input.Read (header, 0, 4))
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break;
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if (!Binary.AsciiEqual (header, "ze"))
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throw new InvalidFormatException ("Malformed compressed stream");
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int chunk_length = BigEndian.ToUInt16 (header, 2);
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bits.Reset();
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UnpackZeChunk (bits, data, dst, chunk_length);
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dst += chunk_length;
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}
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return data;
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}
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}
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void UnpackZeChunk (IBitStream bits, byte[] output, int dst, int unpacked_size)
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{
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int output_end = dst + unpacked_size;
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while (dst < output_end)
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{
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int count = LzeGetInteger (bits);
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if (-1 == count)
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break;
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while (--count > 0)
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{
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int data = bits.GetBits (8);
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if (-1 == data)
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break;
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if (dst < output_end)
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output[dst++] = (byte)data;
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}
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if (count > 0 || dst >= output_end)
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break;
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int offset = LzeGetInteger (bits);
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if (-1 == offset)
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break;
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count = LzeGetInteger (bits);
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if (-1 == count)
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break;
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Binary.CopyOverlapped (output, dst-offset, dst, count);
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dst += count;
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}
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if (dst < output_end)
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throw new EndOfStreamException ("Premature end of compressed stream");
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}
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int LzeGetInteger (IBitStream bits)
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{
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int length = 0;
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for (int i = 0; i < 16; ++i)
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{
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if (0 != bits.GetNextBit())
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break;
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++length;
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}
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int v = 1 << length;
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if (length > 0)
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v |= bits.GetBits (length);
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return v;
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}
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IDictionary<string, string> ReadNameMap (ArcFile file, Arc3Entry entry)
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{
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byte[] table = new byte[entry.UnpackedSize];
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using (var input = OpenEntry (file, entry))
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{
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input.Read (table, 0, table.Length);
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}
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int count = LittleEndian.ToInt32 (table, 0);
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if (!IsSaneCount (count))
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throw new InvalidFormatException ("Invalid longinfo map format");
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var map = new Dictionary<string, string> (count);
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int index_pos = 4;
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int names_pos = index_pos + count * 8;
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for (int i = 0; i < count; ++i)
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{
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int key_pos = names_pos + LittleEndian.ToInt32 (table, index_pos);
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int value_pos = names_pos + LittleEndian.ToInt32 (table, index_pos+4);
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index_pos += 8;
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string key = Binary.GetCString (table, key_pos, table.Length - key_pos);
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map[key] = Binary.GetCString (table, value_pos, table.Length - value_pos);
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}
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return map;
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}
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}
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/// <summary>
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/// like MsbBitStream, but input stream is consumed by 2 bytes at a time.
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/// </summary>
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internal class LzBitStream : BitStream, IBitStream
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{
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public LzBitStream (Stream file, bool leave_open = false)
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: base (file, leave_open)
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{
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}
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public int GetBits (int count)
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{
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Debug.Assert (count <= 24, "LzBitStream does not support sequences longer than 24 bits");
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while (m_cached_bits < count)
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{
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int b = m_input.ReadByte();
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if (-1 == b)
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return -1;
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m_bits = (m_bits << 8) | b;
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m_cached_bits += 8;
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b = m_input.ReadByte();
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if (b != -1)
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{
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m_bits = (m_bits << 8) | b;
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m_cached_bits += 8;
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}
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}
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int mask = (1 << count) - 1;
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m_cached_bits -= count;
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return (m_bits >> m_cached_bits) & mask;
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}
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public int GetNextBit ()
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{
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return GetBits (1);
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}
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}
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}
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