GARbro-mirror/ArcFormats/MAI/ArcMAI.cs

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//! \file ArcMAI.cs
//! \date Sun May 03 09:26:58 2015
//! \brief MAI archive format implementation.
//
// Copyright (C) 2015 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//
using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using System.Linq;
using GameRes.Utility;
namespace GameRes.Formats.MAI
{
[Export(typeof(ArchiveFormat))]
public class ArcOpener : ArchiveFormat
{
public override string Tag { get { return "MAI"; } }
public override string Description { get { return "MAI resource archive"; } }
public override uint Signature { get { return 0x0a49414d; } } // 'MAI\x0a'
public override bool IsHierarchic { get { return true; } }
public override bool CanWrite { get { return false; } }
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public ArcOpener ()
{
Extensions = new string[] { "arc" };
}
internal class DirEntry
{
public string Name;
public int Index;
}
public override ArcFile TryOpen (ArcView file)
{
uint file_size = file.View.ReadUInt32 (4);
if (file_size != file.MaxOffset)
return null;
int count = file.View.ReadInt32 (8);
if (count <= 0 || count > 0xfffff)
return null;
int dir_level = file.View.ReadByte (0x0d);
int dir_entries = file.View.ReadUInt16 (0x0e);
uint index_offset = 0x10;
uint index_size = (uint)(count * 0x18 + dir_entries * 8);
if (index_size > file.View.Reserve (index_offset, index_size))
return null;
List<DirEntry> folders = null;
if (0 != dir_entries && 2 == dir_level)
{
folders = new List<DirEntry> (dir_entries);
uint dir_offset = index_offset + (uint)count*0x18;
for (int i = 0; i < dir_entries; ++i)
{
folders.Add (new DirEntry {
Name = file.View.ReadString (dir_offset, 4),
Index = file.View.ReadInt32 (dir_offset+4)
});
dir_offset += 8;
}
}
bool is_mask_arc = VFS.IsPathEqualsToFileName (file.Name, "mask.arc");
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var dir = new List<Entry> (count);
int next_folder = null == folders ? count : folders[0].Index;
int folder = 0;
string current_folder = "";
for (int i = 0; i < count; ++i)
{
while (i >= next_folder && folder < folders.Count)
{
current_folder = folders[folder++].Name;
if (folders.Count == folder)
next_folder = count;
else
next_folder = folders[folder].Index;
}
string name = file.View.ReadString (index_offset, 0x10);
if (0 == name.Length)
return null;
var offset = file.View.ReadUInt32 (index_offset+0x10);
var entry = new AutoEntry (Path.Combine (current_folder, name), () => {
uint signature = file.View.ReadUInt32 (offset);
if (is_mask_arc)
return ImageFormat.FindByTag ("MSK/MAI");
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else if (0x4d43 == (signature & 0xffff)) // 'CM'
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return ImageFormat.FindByTag ("CM/MAI");
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else if (0x4d41 == (signature & 0xffff)) // 'AM'
return ImageFormat.FindByTag ("AM/MAI");
else if (0x4d42 == (signature & 0xffff)) // 'BM'
return ImageFormat.Bmp;
else if (signature != 0)
return FormatCatalog.Instance.LookupSignature (signature).FirstOrDefault();
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else
return null;
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});
entry.Offset = offset;
entry.Size = file.View.ReadUInt32 (index_offset+0x14);
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
index_offset += 0x18;
}
return new ArcFile (file, this, dir);
}
}
}