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//! \file ArcARF.cs
//! \date 2023 Sep 03
//! \brief Logg resource archive.
//
// Copyright (C) 2023 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 GameRes.Utility;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
// [980417][Logg] Tenshi Kourin
// [980828][Logg] Kazeiro no Romance
namespace GameRes.Formats.Logg
{
[Export(typeof(ArchiveFormat))]
public class ArfOpener : ArchiveFormat
{
public override string Tag => "ARF";
public override string Description => "Logg archive file";
public override uint Signature => 0;
public override bool IsHierarchic => true;
public override bool CanWrite => false;
public override ArcFile TryOpen (ArcView file)
{
int count = file.View.ReadInt32 (0);
if (!IsSaneCount (count))
return null;
uint index = 4;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
uint offset = file.View.ReadUInt32 (index);
if (offset <= index || offset > file.MaxOffset)
return null;
uint size = file.View.ReadUInt32 (index+4);
byte name_len = file.View.ReadByte (index+8);
var name = file.View.ReadString (index+9, name_len);
var entry = Create<PackedEntry> (name);
entry.Offset = offset;
entry.UnpackedSize = size;
dir.Add (entry);
index += name_len + 9u;
if (index > dir[0].Offset)
return null;
}
long last_offset = file.MaxOffset;
for (int i = count-1; i >= 0; --i)
{
var entry = dir[i] as PackedEntry;
entry.Size = (uint)(last_offset - entry.Offset);
last_offset = entry.Offset;
if (string.IsNullOrEmpty (entry.Name))
dir.RemoveAt (i);
else
entry.IsPacked = entry.Size != entry.UnpackedSize;
}
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var pent = (PackedEntry)entry;
if (!pent.IsPacked)
return base.OpenEntry (arc, entry);
var input = arc.File.CreateStream (pent.Offset, pent.Size);
var output = new byte[pent.UnpackedSize];
Decompress (input, output);
return new BinMemoryStream (output, pent.Name);
}
void Decompress (IBinaryStream input, byte[] output)
{
using (var bits = new LsbBitStream (input.AsStream, true))
{
int dst = 0;
while (dst < output.Length)
{
if (bits.GetNextBit() == 0)
{
output[dst++] = (byte)bits.GetBits (8);
}
else
{
int count;
if (bits.GetNextBit() == 0)
count = 2;
else if (bits.GetNextBit() == 0)
count = 3;
else if (bits.GetNextBit() == 0)
count = 4;
else if (bits.GetNextBit() == 0)
count = 5;
else
{
switch (bits.GetBits (2))
{
case 0: count = 6; break;
case 1: count = bits.GetBits (2) + 7; break;
case 2: count = bits.GetBits (4) + 11; break;
case 3: count = bits.GetBits (10) + 26; break;
default: throw new EndOfStreamException();
}
}
int offset;
if (bits.GetNextBit() == 0)
offset = bits.GetBits (8);
else if (bits.GetNextBit() == 0)
offset = bits.GetBits (10) + 0x100;
else
offset = bits.GetBits (12) + 0x500;
Binary.CopyOverlapped (output, dst - offset - 1, dst, count);
dst += count;
}
}
}
}
}
}