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//! \file ArcAST.cs
//! \date Tue Apr 21 02:24:20 2015
//! \brief AST script engine resource archives.
//
// Copyright (C) 2015-2016 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;
using GameRes.Utility;
namespace GameRes.Formats.AST
{
internal class AstArchive : ArcFile
{
public AstArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir)
: base (arc, impl, dir)
{
}
}
[Export(typeof(ArchiveFormat))]
public class ArcOpener : ArchiveFormat
{
public override string Tag { get { return "AST"; } }
public override string Description { get { return "AST script engine resource archive"; } }
public override uint Signature { get { return 0x32435241; } } // 'ARC2'
public override bool IsHierarchic { get { return true; } }
public override bool CanCreate { get { return false; } }
public ArcOpener ()
{
Extensions = new string[] { "" };
Signatures = new uint[] { 0x32435241, 0x31435241 }; // 'ARC2', 'ARC1'
}
public override ArcFile TryOpen (ArcView file)
{
int version = file.View.ReadByte (3) - 0x30;
int count = file.View.ReadInt32 (4);
if (!IsSaneCount (count))
return null;
var name_buf = new byte[32];
var dir = new List<Entry> (count);
long index_offset = 8;
uint next_offset = file.View.ReadUInt32 (index_offset);
for (int i = 0; i < count; ++i)
{
uint offset = next_offset;
uint size = file.View.ReadUInt32 (index_offset+4);
int name_length = file.View.ReadByte (index_offset+8);
if (name_length > name_buf.Length)
name_buf = new byte[name_length];
file.View.Read (index_offset+9, name_buf, 0, (uint)name_length);
if (i+1 == count)
next_offset = (uint)file.MaxOffset;
else
next_offset = file.View.ReadUInt32 (index_offset+9+name_length);
if (0 != offset && offset != file.MaxOffset)
{
if (2 == version)
for (int j = 0; j < name_length; ++j)
name_buf[j] ^= 0xff;
uint packed_size;
if (0 == next_offset)
packed_size = size;
else if (next_offset >= offset)
packed_size = next_offset - offset;
else
return null;
string name = Encodings.cp932.GetString (name_buf, 0, name_length);
var entry = new PackedEntry
{
Name = name,
Type = FormatCatalog.Instance.GetTypeFromName (name),
Offset = offset,
Size = packed_size,
UnpackedSize = size,
IsPacked = packed_size != size,
};
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
}
index_offset += 9 + name_length;
}
if (2 == version)
return new AstArchive (file, this, dir);
else
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var pent = entry as PackedEntry;
if (null == pent || !(arc is AstArchive))
return arc.File.CreateStream (entry.Offset, entry.Size);
if (!pent.IsPacked)
{
arc.File.View.Reserve (entry.Offset, entry.Size);
var sig = arc.File.View.ReadUInt32 (entry.Offset);
if (0xB8B1AF76 == sig) // PNG signature ^ FF
{
var data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
for (int i = 0; i < data.Length; ++i)
data[i] ^= 0xff;
return new MemoryStream (data);
}
return arc.File.CreateStream (entry.Offset, entry.Size);
}
using (var input = arc.File.CreateStream (entry.Offset, entry.Size))
{
var data = UnpackLzss (input, pent.Size, pent.UnpackedSize);
return new MemoryStream (data);
}
}
byte[] UnpackLzss (Stream input, uint input_size, uint output_size)
{
var output = new byte[output_size];
var frame = new byte[0x1000];
int frame_pos = 0xFEE;
const int frame_mask = 0xFFF;
int dst = 0;
int remaining = (int)input_size;
int ctl = 2;
while (dst < output.Length)
{
ctl >>= 1;
if (1 == ctl)
{
if (remaining <= 0)
break;
ctl = input.ReadByte();
if (-1 == ctl)
break;
--remaining;
ctl |= 0x100;
}
if (0 != (ctl & 1))
{
int b = input.ReadByte();
if (-1 == b)
break;
--remaining;
frame[frame_pos++] = output[dst++] = (byte)~b;
frame_pos &= frame_mask;
}
else
{
if (remaining < 2)
break;
int lo = input.ReadByte();
int hi = input.ReadByte();
if (-1 == hi)
break;
remaining -= 2;
int offset = (hi & 0xf0) << 4 | lo;
for (int count = 3 + (hi & 0xF); count != 0; --count)
{
if (dst >= output.Length)
break;
byte v = frame[offset++];
offset &= frame_mask;
frame[frame_pos++] = v;
frame_pos &= frame_mask;
output[dst++] = v;
}
}
}
return output;
}
}
}