GARbro-mirror/Legacy/Eve/ArcGM.cs

186 lines
6.7 KiB
C#
Raw Normal View History

//! \file ArcGM.cs
//! \date 2018 Apr 05
//! \brief Eve resource archive.
//
// Copyright (C) 2018 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 GameRes.Compression;
// [021206][Eve] Mitsugetsu ~Secret Moon~
namespace GameRes.Formats.Eve
{
[Export(typeof(ArchiveFormat))]
public class GmDatOpener : ArchiveFormat
{
public override string Tag { get { return "DAT/GM"; } }
public override string Description { get { return "Eve resource archive"; } }
public override uint Signature { get { return 0x2E314D47; } } // 'GM1.0'
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
public override ArcFile TryOpen (ArcView file)
{
if (file.View.ReadByte (4) != '0')
return null;
using (var index = file.CreateStream())
{
var signature = index.ReadCString();
index.Position = (((int)index.Position + 4) >> 2) << 2;
uint data_offset = index.ReadUInt16();
uint index_size = index.ReadUInt32();
uint index_offset = index.ReadUInt32();
int count = index.ReadInt32();
if (!IsSaneCount (count))
return null;
int key_length = index.ReadUInt16();
int flags = index.ReadUInt16();
index.Position = 20;
var key = index.ReadBytes (key_length);
index.Position = index_offset + 0xC00;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
uint offset = index.ReadUInt32() + data_offset;
uint size = index.ReadUInt32();
int name_len = index.ReadUInt8();
var name = index.ReadCString (name_len);
var entry = FormatCatalog.Instance.Create<Entry> (name);
entry.Offset = offset;
entry.Size = size;
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
}
return new ArcFile (file, this, dir);
}
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var header = arc.File.View.ReadBytes (entry.Offset, 25);
if (header[0] < 'B' || header[0] > 'E' || header[1] != '1')
return arc.File.CreateStream (entry.Offset, entry.Size);
if ('E' == header[0])
{
byte t = header[17];
header[17] = header[23];
header[23] = t;
t = header[19];
header[19] = header[24];
header[24] = t;
}
int unpacked_size = header.ToInt32 (6);
var data = new byte[unpacked_size];
Stream input = arc.File.CreateStream (entry.Offset+header.Length, entry.Size-(uint)header.Length);
input = new PrefixStream (header, input);
input.Position = 10;
using (input = new LzssStream (input))
input.Read (data, 0, unpacked_size);
if (data.AsciiEqual ("BPR01"))
return new PackedStream<BprDecompressor> (Stream.Null, new BprDecompressor (data));
else
return new BinMemoryStream (data, entry.Name);
}
void DecryptIndex (byte[] index, int length, byte[] key)
{
for (int i = 0; i < length; ++i)
{
index[i] ^= key[i % key.Length];
}
}
}
internal class BprDecompressor : Decompressor
{
IBinaryStream m_input;
public BprDecompressor ()
{
}
public BprDecompressor (byte[] data)
{
m_input = new BinMemoryStream (data, 5, data.Length-5);
}
public override void Initialize (Stream input)
{
}
protected override IEnumerator<int> Unpack ()
{
for (;;)
{
int ctl = m_input.ReadByte();
if (-1 == ctl || 0xFF == ctl)
yield break;
int count = m_input.ReadInt32();
if (1 == ctl)
{
byte v = m_input.ReadUInt8();
while (count --> 0)
{
m_buffer[m_pos++] = v;
if (0 == --m_length)
yield return m_pos;
}
}
else
{
while (count > 0)
{
int chunk = Math.Min (count, m_length);
chunk = m_input.Read (m_buffer, m_pos, chunk);
if (0 == chunk)
yield break;
m_pos += chunk;
m_length -= chunk;
count -= chunk;
if (0 == m_length)
yield return m_pos;
}
}
}
}
#region IDisposable Members
bool m_disposed = false;
protected override void Dispose (bool disposing)
{
if (!m_disposed)
{
if (disposing && m_input != null)
m_input.Dispose();
m_disposed = true;
base.Dispose();
}
}
#endregion
}
}