GARbro-mirror/ArcFormats/Circus/ArcValkyrieComplex.cs

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2016-04-24 00:13:11 +08:00
//! \file ArcValkyrieComplex.cs
//! \date Sat Apr 23 14:58:33 2016
//! \brief Valkyrie Complex resource archives.
//
// Copyright (C) 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 System.Linq;
using GameRes.Utility;
namespace GameRes.Formats.Circus
{
internal class VcPakFile : ArcFile
{
public readonly byte Key;
public VcPakFile (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, byte key)
: base (arc, impl, dir)
{
Key = key;
}
}
[Export(typeof(ArchiveFormat))]
public class VcPakOpener : ArchiveFormat
{
public override string Tag { get { return "PAK/VC"; } }
public override string Description { get { return "Valkyrie Complex resource archive"; } }
public override uint Signature { get { return 0x62827582; } } // ''
public override bool IsHierarchic { get { return true; } }
public override bool CanWrite { get { return false; } }
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static readonly byte[] TrialSignature = Encodings.cp932.GetBytes ("VC体験版");
static readonly byte[] RetailSignature = Encodings.cp932.GetBytes ("VC製品版");
public VcPakOpener ()
{
Extensions = new string[] { "pak" };
}
public override ArcFile TryOpen (ArcView file)
{
var signature = file.View.ReadBytes (0, 10);
bool is_trial = signature.SequenceEqual (TrialSignature);
if (!is_trial && !signature.SequenceEqual (RetailSignature))
return null;
byte key = (byte)(is_trial ? 0x38 : 0x58);
uint ukey = (uint)key << 8 | key;
ukey |= ukey << 16;
int count = (int)(file.View.ReadUInt32 (0x18) ^ ukey);
if (!IsSaneCount (count))
return null;
uint index_size = file.View.ReadUInt32 (0x1C) ^ ukey;
if (index_size >= file.MaxOffset)
return null;
var index = file.View.ReadBytes (0x20, index_size);
for (int i = 0; i < index.Length; ++i)
index[i] ^= key;
int index_pos = 4;
int names_pos = count * 0x10;
var dir = new List<Entry> (count);
for (uint i = 0; i < count; ++i)
{
int name_length = LittleEndian.ToInt32 (index, index_pos);
var name = Encodings.cp932.GetString (index, names_pos, name_length);
var entry = FormatCatalog.Instance.Create<Entry> (name);
entry.Offset = LittleEndian.ToUInt32 (index, index_pos+4);
entry.Size = LittleEndian.ToUInt32 (index, index_pos+8);
if (!entry.CheckPlacement (file.MaxOffset))
return null;
if (name.EndsWith (".cps", StringComparison.InvariantCultureIgnoreCase))
entry.Type = "image";
dir.Add (entry);
index_pos += 0x10;
names_pos += name_length + 1;
}
return new VcPakFile (file, this, dir, (byte)(is_trial ? 0x25 : 0x24));
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var vcarc = arc as VcPakFile;
if (null == vcarc)
return base.OpenEntry (arc, entry);
var data = vcarc.File.View.ReadBytes (entry.Offset, entry.Size);
for (int i = 0; i < data.Length; ++i)
data[i] ^= vcarc.Key;
if (entry.Name.EndsWith (".cs", StringComparison.InvariantCultureIgnoreCase))
{
for (int i = 0; i < data.Length; ++i)
--data[i];
}
else if (entry.Name.EndsWith (".cps", StringComparison.InvariantCultureIgnoreCase))
{
data = UnpackCps (data);
}
return new MemoryStream (data);
}
byte[] UnpackCps (byte[] input)
{
uint unpacked_size = (LittleEndian.ToUInt32 (input, 0) ^ 0xA415FCF) & 0xFFFFFFF;
int type = input[3] >> 4;
if (type > 3)
return input;
DecryptCps (input);
var output = new byte[unpacked_size];
switch (type)
{
case 0: Buffer.BlockCopy (input, 4, output, 0, output.Length); break;
case 1: UnpackV1 (input, output); break;
case 2: UnpackV2 (input, output); break;
case 3: UnpackV3 (input, output); break;
}
return output;
}
static void DecryptCps (byte[] input)
{
int length = input.Length;
if (length < 0x308)
return;
input[4] ^= input[length - 1];
byte key = 0xFF;
length -= 8;
int a = 8 + length - key;
int b = 8 + length / 0x200 + key;
byte t = input[a];
input[a] = input[b];
input[b] = t;
a = 8 + key + 2 * (length / 0x200);
b = 8 + length - 2 * key;
t = input[a];
input[a] = input[b];
input[b] = t;
}
static void UnpackV1 (byte[] input, byte[] output)
{
int dst = 0;
using (var mem = new MemoryStream (input, 4, input.Length-4))
using (var bits = new ReverseBitStream (mem))
{
while (dst < output.Length)
{
int count = bits.GetBits (4);
if (0 != bits.GetNextBit())
{
for (int i = 0; i <= count; ++i)
output[dst++] = (byte)bits.GetBits (8);
}
else
{
byte b = (byte)bits.GetBits (8);
for (int i = 0; i < count; ++i)
output[dst++] = b;
}
}
}
}
static void UnpackV2 (byte[] input, byte[] output)
{
output[output.Length-1] = input[36];
using (var mem = new MemoryStream (input, 38, input.Length-38))
using (var bits = new ReverseBitStream (mem))
{
for (int dst = 0; dst < output.Length; dst += 2)
{
if (0 != bits.GetNextBit())
{
output[dst+1] = (byte)bits.GetBits (8);
output[dst] = (byte)bits.GetBits (8);
}
else
{
int j;
for (j = 0; j < 30; j += 2)
{
if (0 != bits.GetNextBit())
break;
}
output[dst] = input[4 + j];
output[dst+1] = input[5 + j];
}
}
}
}
static void UnpackV3 (byte[] input, byte[] output)
{
int src = 4;
int dst = 0;
if (output.Length <= 128)
{
Buffer.BlockCopy (input, src, output, dst, output.Length);
return;
}
Buffer.BlockCopy (input, src, output, dst, 128);
src += 128;
dst += 128;
using (var mem = new MemoryStream (input, src, input.Length-src))
using (var bits = new ReverseBitStream (mem))
{
while (dst < output.Length)
{
if (0 != bits.GetNextBit())
{
int offset = bits.GetBits (7) + 1;
int count = bits.GetBits (4) + 2;
Binary.CopyOverlapped (output, dst - offset, dst, count);
dst += count;
}
else
{
output[dst++] = (byte)bits.GetBits (8);
}
}
}
}
}
internal class ReverseBitStream : BitStream, IBitStream
{
public ReverseBitStream (Stream file, bool leave_open = false)
: base (file, leave_open)
{
}
public int GetBits (int count)
{
while (m_cached_bits < count)
{
int b = m_input.ReadByte();
if (-1 == b)
return -1;
m_bits |= b << m_cached_bits;
m_cached_bits += 8;
}
int value = 0;
m_cached_bits -= count;
while (count --> 0)
{
value |= (m_bits & 1) << count;
m_bits >>= 1;
}
return value;
}
public int GetNextBit ()
{
return GetBits (1);
}
}
[Export(typeof(ArchiveFormat))]
public class VcPacOpener : ArchiveFormat
{
public override string Tag { get { return "PAC/VC"; } }
public override string Description { get { return "Valkyrie Complex resource archive"; } }
public override uint Signature { get { return 1; } }
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
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public VcPacOpener ()
{
Extensions = new string[] { "pac" };
}
public override ArcFile TryOpen (ArcView file)
{
int count = file.View.ReadInt32 (4);
if (!IsSaneCount (count))
return null;
uint base_offset = file.View.ReadUInt32 (8);
uint file_size = file.View.ReadUInt32 (0xC);
if (base_offset >= file.MaxOffset || file_size != file.MaxOffset)
return null;
uint index_offset = 0x20;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
var name = file.View.ReadString (index_offset, 0x20);
var entry = FormatCatalog.Instance.Create<Entry> (name);
index_offset += 0x20;
entry.Size = file.View.ReadUInt32 (index_offset);
entry.Offset = file.View.ReadUInt32 (index_offset+4) + base_offset;
if (!entry.CheckPlacement (file.MaxOffset))
return null;
index_offset += 0x18;
dir.Add (entry);
}
return new ArcFile (file, this, dir);
}
}
}