121 lines
4.9 KiB
C#
Raw Normal View History

//! \file ArcCMP.cs
//! \date Sun Jan 15 15:44:39 2017
//! \brief 'Game System' engine resource archive.
//
// Copyright (C) 2017 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.Text;
using GameRes.Utility;
namespace GameRes.Formats.GameSystem
{
[Export(typeof(ArchiveFormat))]
public class CmpOpener : ArchiveFormat
{
public override string Tag { get { return "CMP"; } }
public override string Description { get { return "'GameSystem' engine resource archive"; } }
public override uint Signature { get { return 0; } }
public override bool IsHierarchic { get { return true; } }
public override bool CanWrite { get { return false; } }
public override ArcFile TryOpen (ArcView file)
{
if (file.MaxOffset <= 8 || !file.View.AsciiEqual (file.MaxOffset-8, "PACK"))
return null;
uint index_offset = file.View.ReadUInt32 (file.MaxOffset-4);
if (index_offset >= file.MaxOffset)
return null;
int index_size = file.View.ReadInt32 (index_offset);
var index = new byte[index_size];
using (var input = file.CreateStream (index_offset+4))
LzUnpack (input, index);
var dir = new List<Entry>();
int index_pos = 0;
uint offset = LittleEndian.ToUInt32 (index, index_pos);
while (index_pos < index.Length)
{
index_pos += 4;
int name_length = index[index_pos];
if (0 == name_length)
break;
bool is_packed = index[index_pos+1] != 0;
index_pos += 6;
name_length *= 2;
var name = Encoding.Unicode.GetString (index, index_pos, name_length);
index_pos += name_length;
uint next_offset = LittleEndian.ToUInt32 (index, index_pos);
var entry = FormatCatalog.Instance.Create<PackedEntry> (name);
entry.Offset = offset;
entry.Size = next_offset - offset;
entry.IsPacked = is_packed;
if (!entry.CheckPlacement (index_offset))
return null;
dir.Add (entry);
offset = next_offset;
}
if (0 == dir.Count)
return null;
return new ArcFile (file, this, dir);
}
void LzUnpack (IBinaryStream input, byte[] output)
{
int dst = 0;
while (dst < output.Length)
{
byte ctl = input.ReadUInt8();
if (0 != (ctl & 0x80))
{
int num = input.ReadUInt8() + (ctl << 8);
int offset = num & 0x7FF;
int count = Math.Min (((num >> 10) & 0x1E) + 2, output.Length - dst);
Binary.CopyOverlapped (output, dst-offset-1, dst, count);
dst += count;
}
else
{
int count = Math.Min (ctl + 1, output.Length - dst);
input.Read (output, dst, count);
dst += count;
}
}
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var pent = entry as PackedEntry;
if (null == pent || !pent.IsPacked)
return base.OpenEntry (arc, entry);
if (0 == pent.UnpackedSize)
pent.UnpackedSize = arc.File.View.ReadUInt32 (entry.Offset);
var data = new byte[pent.UnpackedSize];
using (var input = arc.File.CreateStream (entry.Offset+4, entry.Size-4))
LzUnpack (input, data);
return new BinMemoryStream (data, entry.Name);
}
}
}