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GARbro-mirror/ArcFormats/ArcWARC.cs

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implemented ShiinaRio resources. WARC archives; S25 images; OGV sound files.
2015-04-20 20:57:01 +04:00
//! \file ArcWARC.cs
//! \date Fri Apr 10 03:10:42 2015
//! \brief ShiinaRio engine archive format.
//
// Copyright (C) 2015 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 System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Media.Imaging;
using GameRes.Formats.Properties;
using GameRes.Formats.Strings;
using GameRes.Utility;
using ZLibNet;
namespace GameRes.Formats.ShiinaRio
{
internal class WarOptions : ResourceOptions
{
public EncryptionScheme Scheme { get; set; }
}
internal class WarcEntry : PackedEntry
{
public long FileTime;
public uint Flags;
}
internal class WarcFile : ArcFile
{
public readonly Decoder Decoder;
public WarcFile (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, Decoder decoder)
: base (arc, impl, dir)
{
this.Decoder = decoder;
}
}
[Export(typeof(ArchiveFormat))]
public class WarOpener : ArchiveFormat
{
public override string Tag { get { return "WAR"; } }
public override string Description { get { return "ShiinaRio engine resource archive"; } }
public override uint Signature { get { return 0x43524157; } } // 'WARC'
public override bool IsHierarchic { get { return false; } }
public override bool CanCreate { get { return false; } }
public override ArcFile TryOpen (ArcView file)
{
if (!file.View.AsciiEqual (4, " 1."))
return null;
int version = file.View.ReadByte (7) - 0x30;
version = 100 + version * 10;
if (170 != version)
throw new NotSupportedException ("Not supported WARC version");
uint index_offset = 0xf182ad82u ^ file.View.ReadUInt32 (8);
if (index_offset >= file.MaxOffset)
return null;
var scheme = QueryEncryption();
if (null == scheme)
return null;
var decoder = new Decoder (version, scheme);
uint max_index_len = decoder.MaxIndexLength;
uint index_length = (uint)Math.Min (max_index_len, file.MaxOffset - index_offset);
if (index_length < 8)
return null;
var enc_index = new byte[max_index_len];
if (index_length != file.View.Read (index_offset, enc_index, 0, index_length))
return null;
decoder.DecryptIndex (index_offset, enc_index);
Stream index;
if (version >= 170)
{
if (0x78 != enc_index[8]) // FIXME: check if it looks like ZLib stream
return null;
var zindex = new MemoryStream (enc_index, 8, (int)index_length-8);
index = new ZLibStream (zindex, CompressionMode.Decompress);
}
else
{
var unpacked = new byte[max_index_len];
index_length = UnpackRNG (enc_index, unpacked);
if (0 == index_length)
return null;
index = new MemoryStream (unpacked, 0, (int)index_length);
}
using (var header = new BinaryReader (index))
{
byte[] name_buf = new byte[decoder.EntryNameSize];
var dir = new List<Entry> ();
while (name_buf.Length == header.Read (name_buf, 0, name_buf.Length))
{
var name = Binary.GetCString (name_buf, 0, name_buf.Length);
var entry = new WarcEntry {
Name = name,
Type = FormatCatalog.Instance.GetTypeFromName (name)
};
entry.Offset = header.ReadUInt32();
entry.Size = header.ReadUInt32();
if (!entry.CheckPlacement (file.MaxOffset))
return null;
entry.UnpackedSize = header.ReadUInt32();
entry.IsPacked = entry.Size != entry.UnpackedSize;
entry.FileTime = header.ReadInt64();
entry.Flags = header.ReadUInt32();
if (0 != name.Length)
dir.Add (entry);
}
if (0 == dir.Count)
return null;
return new WarcFile (file, this, dir, decoder);
}
}
private void Dump (string name, byte[] data)
{
using (var dump = File.Create (name))
dump.Write (data, 0, data.Length);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var warc = arc as WarcFile;
var wentry = entry as WarcEntry;
if (null == warc || null == wentry || entry.Size < 8)
return arc.File.CreateStream (entry.Offset, entry.Size);
var enc_data = new byte[entry.Size];
if (entry.Size != arc.File.View.Read (entry.Offset, enc_data, 0, entry.Size))
return Stream.Null;
uint sig = LittleEndian.ToUInt32 (enc_data, 0);
uint unpacked_size = LittleEndian.ToUInt32 (enc_data, 4);
sig ^= (unpacked_size ^ 0x82AD82) & 0xffffff;
if (0 != (wentry.Flags & 0x80000000u) && entry.Size > 8) // encrypted entry
warc.Decoder.Decrypt (enc_data, 8, entry.Size-8);
if (0 != (wentry.Flags & 0x20000000u) && entry.Size > 8)
warc.Decoder.Decrypt2 (enc_data, 8, entry.Size-8);
bool perform_post_crypt = 0 != (wentry.Flags & 0x40000000);
byte[] unpacked;
if (0x314859 == (sig & 0xffffff)) // 'YH1'
{
unpacked = new byte[unpacked_size];
UnpackYH1 (enc_data, unpacked);
}
else if (0x4b5059 == (sig & 0xffffff)) // 'YPK'
{
unpacked = new byte[unpacked_size];
UnpackYPK (enc_data, unpacked);
}
else
{
unpacked = enc_data;
perform_post_crypt = false;
}
if (perform_post_crypt)
{
warc.Decoder.Decrypt2 (unpacked, 0, (uint)unpacked.Length);
if (warc.Decoder.SchemeVersion >= 2490)
warc.Decoder.Decrypt3 (unpacked, 0, (uint)unpacked.Length);
}
return new MemoryStream (unpacked);
}
void UnpackYH1 (byte[] input, byte[] output)
{
if (0 != input[3])
{
uint key = 0x6393528e^0x4b4du; // 'KM'
unsafe
{
fixed (byte* buf_raw = input)
{
uint* encoded = (uint*)buf_raw;
int i;
for (i = 2; i < input.Length/4; ++i)
encoded[i] ^= key;
}
}
var decoder = new HuffmanReader (input, 8, input.Length-8, output);
decoder.Unpack();
}
}
void UnpackYPK (byte[] input, byte[] output)
{
if (0 != input[3])
{
uint key = ~0x4b4d4b4du; // 'KMKM'
unsafe
{
fixed (byte* buf_raw = input)
{
uint* encoded = (uint*)buf_raw;
int i;
for (i = 2; i < input.Length/4; ++i)
encoded[i] ^= key;
for (i *= 4; i < input.Length; ++i)
buf_raw[i] ^= (byte)key;
}
}
}
var src = new MemoryStream (input, 8, input.Length-8);
using (var zlib = new ZLibStream (src, CompressionMode.Decompress))
zlib.Read (output, 0, output.Length);
}
uint UnpackRNG (byte[] input, byte[] output)
{
var coder = new Kogado.CRangeCoder();
coder.InitQSModel (257, 12, 2000, null, false);
return coder.Decode (output, 0, (uint)output.Length, input, 1, (uint)input.Length-1);
}
public override ResourceOptions GetDefaultOptions ()
{
return new WarOptions {
Scheme = GetScheme (Settings.Default.WARCScheme),
};
}
public override object GetAccessWidget ()
{
return new GUI.WidgetWARC();
}
EncryptionScheme QueryEncryption ()
{
var options = Query<WarOptions> (arcStrings.ArcEncryptedNotice);
return options.Scheme;
}
static EncryptionScheme GetScheme (string scheme)
{
return Decoder.KnownSchemes.Where (s => s.Name == scheme).FirstOrDefault();
}
}
internal class HuffmanReader
{
byte[] m_src;
byte[] m_dst;
uint[] lhs = new uint[511];
uint[] rhs = new uint[511];
int m_origin;
int m_total;
int m_input_pos;
int m_remaining;
int m_curbits;
uint m_cache;
uint m_curindex;
public HuffmanReader (byte[] src, int index, int length, byte[] dst)
{
m_src = src;
m_dst = dst;
m_origin = index;
m_total = length;
}
public HuffmanReader (byte[] src, byte[] dst) : this (src, 0, src.Length, dst)
{
}
public byte[] Unpack ()
{
m_input_pos = m_origin;
m_remaining = m_total;
m_curbits = 0;
m_curindex = 256;
uint index = CreateTree();
for (int i = 0; i < m_dst.Length; ++i)
{
uint idx = index;
while (idx >= 256)
{
uint is_right;
if (--m_curbits < 0)
{
m_curbits = 31;
m_cache = ReadUInt32();
is_right = m_cache >> 31;
}
else
is_right = (m_cache >> m_curbits) & 1;
if (0 != is_right)
idx = rhs[idx];
else
idx = lhs[idx];
}
m_dst[i] = (byte)idx;
}
return m_dst;
}
uint ReadUInt32 ()
{
if (0 == m_remaining)
throw new InvalidFormatException ("Unexpected end of file");
uint v;
if (m_remaining >= 4)
{
v = LittleEndian.ToUInt32 (m_src, m_input_pos);
m_input_pos += 4;
m_remaining -= 4;
}
else
{
v = m_src[m_input_pos++];
int shift = 8;
while (--m_remaining != 0)
{
v |= (uint)(m_src[m_input_pos++] << shift);
shift += 8;
}
}
return v;
}
uint GetBits (int req_bits)
{
uint ret_val = 0;
if (req_bits > m_curbits)
{
do
{
req_bits -= m_curbits;
ret_val |= (m_cache & ((1u << m_curbits) - 1u)) << req_bits;
m_cache = ReadUInt32();
m_curbits = 32;
}
while (req_bits > 32);
}
m_curbits -= req_bits;
return ret_val | ((1u << req_bits) - 1u) & (m_cache >> m_curbits);
}
uint CreateTree ()
{
uint not_leaf;
if (m_curbits-- < 1)
{
m_curbits = 31;
m_cache = ReadUInt32();
not_leaf = m_cache >> 31;
}
else
not_leaf = (m_cache >> m_curbits) & 1;
uint i;
if (0 != not_leaf)
{
i = m_curindex++;
lhs[i] = CreateTree();
rhs[i] = CreateTree();
}
else
i = GetBits (8);
return i;
}
}
internal class CachedResource
{
Dictionary<string, byte[]> ResourceCache = new Dictionary<string, byte[]>();
Dictionary<string, byte[]> RegionCache = new Dictionary<string, byte[]>();
public static Stream Open (string name)
{
var assembly = typeof(CachedResource).Assembly;
var stream = assembly.GetManifestResourceStream ("GameRes.Formats.Resources." + name);
if (null == stream)
throw new FileNotFoundException ("Resource not found", name);
return stream;
}
public byte[] Load (string name)
{
byte[] res;
if (!ResourceCache.TryGetValue (name, out res))
{
using (var stream = Open (name))
{
res = new byte[stream.Length];
stream.Read (res, 0, res.Length);
ResourceCache[name] = res;
}
}
return res;
}
// FIXME: this approach disregards possible differences in regions width or height
public byte[] LoadRegion (string name, int width, int height)
{
byte[] region;
if (!RegionCache.TryGetValue (name, out region))
{
using (var png = Open (name))
{
region = new byte[width*height*4];
var decoder = new PngBitmapDecoder (png, BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
var bitmap = decoder.Frames[0];
width = Math.Min (width, bitmap.PixelWidth);
height = Math.Min (height, bitmap.PixelHeight);
int stride = bitmap.PixelWidth * bitmap.Format.BitsPerPixel / 8;
Int32Rect rect = new Int32Rect (0, 0, width, height);
bitmap.CopyPixels (rect, region, stride, 0);
}
}
return region;
}
}
internal class EncryptionScheme
{
public string Name { get; set; }
public int Version;
public int EntryNameSize;
public byte[] CryptKey;
public uint[] HelperKey;
public byte[] ShiinaImage;
public byte[] Region;
public byte[] DecodeBin;
private static CachedResource Resource = new CachedResource();
public static EncryptionScheme Create (string name, int version, int entry_name_size,
string key1, uint[] key2,
string image, string region_src, string decode_bin = null)
{
var scheme = new EncryptionScheme
{
Name = name,
Version = version,
EntryNameSize = entry_name_size,
CryptKey = Encodings.cp932.GetBytes (key1),
HelperKey = key2,
ShiinaImage = Resource.Load (image),
Region = Resource.LoadRegion (region_src, 48, 48),
};
if (null != decode_bin)
scheme.DecodeBin = Resource.Load (decode_bin);
return scheme;
}
}
internal class Decoder
{
EncryptionScheme m_scheme;
public int SchemeVersion { get { return m_scheme.Version; } }
public int WarcVersion { get; private set; }
public uint MaxIndexLength { get; private set; }
public int EntryNameSize { get { return m_scheme.EntryNameSize; } }
private uint Rand { get; set; }
public Decoder (int version, EncryptionScheme scheme)
{
m_scheme = scheme;
WarcVersion = version;
MaxIndexLength = GetMaxIndexLength (version);
}
public void Decrypt (byte[] data, int index, uint data_length)
{
if (data_length < 3)
return;
uint effective_length = Math.Min (data_length, 1024u);
int a, b;
uint fac = 0;
if (WarcVersion > 120)
{
Rand = data_length;
a = (sbyte)data[index] ^ (sbyte)data_length;
b = (sbyte)data[index+1] ^ (sbyte)(data_length / 2);
if (data_length != MaxIndexLength)
{
// ... regular entry decryption
int idx = (int)((double)NextRand() * (m_scheme.ShiinaImage.Length / 4294967296.0));
if (WarcVersion >= 160)
{
fac = Rand + m_scheme.ShiinaImage[idx];
fac = DecryptHelper3 (fac) & 0xfffffff;
if (effective_length > 0x80)
{
DecryptHelper4 (data, index+4, m_scheme.HelperKey);
index += 0x80;
effective_length -= 0x80;
}
}
else if (150 == WarcVersion)
{
fac = Rand + m_scheme.ShiinaImage[idx];
fac ^= (fac & 0xfff) * (fac & 0xfff);
uint v = 0;
for (int i = 0; i < 32; ++i)
{
uint bit = fac & 1;
fac >>= 1;
if (0 != bit)
v += fac;
}
fac = v;
}
else if (140 == WarcVersion)
{
fac = m_scheme.ShiinaImage[idx];
}
else if (130 == WarcVersion)
{
fac = m_scheme.ShiinaImage[idx & 0xff];
}
}
}
else
{
a = data[index];
b = data[index+1];
}
Rand ^= (uint)(DecryptHelper1 (a) * 100000000.0);
double token = 0.0;
if (0 != (a|b))
{
token = Math.Acos ((double)a / Math.Sqrt ((double)(a*a + b*b)));
token = token / Math.PI * 180.0;
}
if (b < 0)
token = 360.0 - token;
uint x = (fac + (byte)DecryptHelper2 (token)) % (uint)m_scheme.CryptKey.Length;
int n = 0;
for (int i = 2; i < effective_length; ++i)
{
byte d = data[index+i];
if (WarcVersion > 120)
d ^= (byte)((double)NextRand() / 16777216.0);
else
d ^= (byte)((double)NextRand() / 4294967296.0); // ? effectively a no-op
d = (byte)(((d & 1) << 7) | (d >> 1));
d ^= (byte)(m_scheme.CryptKey[n++] ^ m_scheme.CryptKey[x]);
data[index+i] = d;
x = d % (uint)m_scheme.CryptKey.Length;
if (n >= m_scheme.CryptKey.Length)
n = 0;
}
}
public void DecryptIndex (uint index_offset, byte[] enc_index)
{
Decrypt (enc_index, 0, (uint)enc_index.Length);
unsafe
{
fixed (byte* buf_raw = enc_index)
{
uint* encoded = (uint*)buf_raw;
for (int i = 0; i < enc_index.Length/4; ++i)
encoded[i] ^= index_offset;
if (WarcVersion >= 170)
{
byte key = (byte)~WarcVersion;
for (int i = 0; i < enc_index.Length; ++i)
buf_raw[i] ^= key;
}
}
}
}
public void Decrypt2 (byte[] data, int index, uint length)
{
if (length < 0x400 || null == m_scheme.DecodeBin)
return;
uint crc = 0xffffffff;
for (int i = 0; i < 0x100; ++i)
{
crc ^= (uint)data[index++] << 24;
for (int j = 0; j < 8; ++j)
{
uint bit = crc & 0x80000000u;
crc <<= 1;
if (0 != bit)
crc ^= 0x04c11db7;
}
}
for (int i = 0; i < 0x40; ++i)
{
uint src = LittleEndian.ToUInt32 (data, index) & 0x1ffcu;
src = LittleEndian.ToUInt32 (m_scheme.DecodeBin, (int)src);
uint key = src ^ crc;
data[index++ + 0x100] ^= (byte)key;
data[index++ + 0x100] ^= (byte)(key >> 8);
data[index++ + 0x100] ^= (byte)(key >> 16);
data[index++ + 0x100] ^= (byte)(key >> 24);
}
}
public void Decrypt3 (byte[] data, int index, uint length)
{
if (length < 0x400)
return;
int src = index;
uint key = 0;
for (uint i = (length & 0x7eu) + 1; i != 0; --i)
{
key ^= data[src++];
for (int j = 0; j < 8; ++j)
{
uint bit = key & 1;
key = bit << 15 | key >> 1;
if (0 == bit)
key ^= 0x408;
}
}
data[index+0x104] ^= (byte)key;
data[index+0x105] ^= (byte)(key >> 8);
}
double DecryptHelper1 (double a)
{
if (a < 0)
return -DecryptHelper1 (-a);
double v0;
double v1;
if (a < 18.0)
{
v0 = a;
v1 = a;
double v2 = -(a * a);
for (int j = 3; j < 1000; j += 2)
{
v1 *= v2 / (j * (j - 1));
v0 += v1 / j;
if (v0 == v2)
break;
}
return v0;
}
int flags = 0;
double v0_l = 0;
v1 = 0;
double div = 1 / a;
double v1_h = 2.0;
double v0_h = 2.0;
double v1_l = 0;
v0 = 0;
int i = 0;
do
{
v0 += div;
div *= ++i / a;
if (v0 < v0_h)
v0_h = v0;
else
flags |= 1;
v1 += div;
div *= ++i / a;
if (v1 < v1_h)
v1_h = v1;
else
flags |= 2;
v0 -= div;
div *= ++i / a;
if (v0 > v0_l)
v0_l = v0;
else
flags |= 4;
v1 -= div;
div *= ++i / a;
if (v1 > v1_l)
v1_l = v1;
else
flags |= 8;
}
while (flags != 0xf);
return ((Math.PI - Math.Cos(a) * (v0_l + v0_h)) - (Math.Sin(a) * (v1_l + v1_h))) / 2.0;
}
uint DecryptHelper2 (double a)
{
double v0, v1, v2, v3;
if (a > 1.0)
{
v0 = Math.Sqrt (a * 2 - 1);
for (;;)
{
v1 = 1 - (double)NextRand() / 4294967296.0;
v2 = 2.0 * (double)NextRand() / 4294967296.0 - 1.0;
if (v1 * v1 + v2 * v2 > 1.0)
continue;
v2 /= v1;
v3 = v2 * v0 + a - 1.0;
if (v3 <= 0)
continue;
v1 = (a - 1.0) * Math.Log (v3 / (a - 1.0)) - v2 * v0;
if (v1 < -50.0)
continue;
if (((double)NextRand() / 4294967296.0) <= (Math.Exp(v1) * (v2 * v2 + 1.0)))
break;
}
}
else
{
v0 = Math.Exp(1.0) / (a + Math.Exp(1.0));
do
{
v1 = (double)NextRand() / 4294967296.0;
v2 = (double)NextRand() / 4294967296.0;
if (v1 < v0)
{
v3 = Math.Pow(v2, 1.0 / a);
v1 = Math.Exp(-v3);
} else
{
v3 = 1.0 - Math.Log(v2);
v1 = Math.Pow(v3, a - 1.0);
}
}
while ((double)NextRand() / 4294967296.0 >= v1);
}
if (WarcVersion > 120)
return (uint)(v3 * 256.0);
else
return (byte)((double)NextRand() / 4294967296.0);
}
[StructLayout(LayoutKind.Explicit)]
struct Union
{
[FieldOffset(0)]
public int i;
[FieldOffset (0)]
public uint u;
[FieldOffset(0)]
public float f;
[FieldOffset(0)]
public byte b0;
[FieldOffset(1)]
public byte b1;
[FieldOffset(2)]
public byte b2;
[FieldOffset(3)]
public byte b3;
}
uint DecryptHelper3 (uint key)
{
var p = new Union();
p.u = key;
var fv = new Union();
fv.f = (float)(1.5 * (double)p.b0 + 0.1);
uint v0 = Binary.BigEndian (fv.u);
fv.f = (float)(1.5 * (double)p.b1 + 0.1);
uint v1 = (uint)fv.f;
fv.f = (float)(1.5 * (double)p.b2 + 0.1);
uint v2 = (uint)-fv.i;
fv.f = (float)(1.5 * (double)p.b3 + 0.1);
uint v3 = ~fv.u;
return ((v0 + v1) | (v2 - v3));
}
void DecryptHelper4 (byte[] data, int index, uint[] key_src)
{
uint[] buf = new uint[0x50];
int i;
for (i = 0; i < 0x10; ++i)
{
buf[i] = BigEndian.ToUInt32 (data, index+40+4*i);
}
for (; i < 0x50; ++i)
{
uint v = buf[i-16];
v ^= buf[i-14];
v ^= buf[i-8];
v ^= buf[i-3];
v = v << 1 | v >> 31;
buf[i] = v;
}
uint[] key = new uint[10];
Array.Copy (key_src, key, 5);
uint k0 = key[0];
uint k1 = key[1];
uint k2 = key[2];
uint k3 = key[3];
uint k4 = key[4];
uint pc = 0;
uint v26 = 0;
int buf_idx = 0;
for (int ebp = 0; ebp < 0x50; ++ebp)
{
if (ebp >= 0x10)
{
if (ebp >= 0x20)
{
if (ebp >= 0x30)
{
uint v27 = ~k3;
if (ebp >= 0x40)
{
v26 = k1 ^ (k2 | v27);
pc = 0xA953FD4E;
}
else
{
v26 = k1 & k3 | k2 & v27;
pc = 0x8F1BBCDC;
}
}
else
{
v26 = k3 ^ (k1 | ~k2);
pc = 0x6ED9EBA1;
}
}
else
{
v26 = k1 & k2 | k3 & ~k1;
pc = 0x5A827999;
}
}
else
{
v26 = k1 ^ k2 ^ k3;
pc = 0;
}
uint v28 = buf[buf_idx] + k4 + v26 + pc + (k0 << 5 | k0 >> 27);
uint v29 = (k1 >> 2) | (k1 << 30);
k1 = k0;
k4 = k3;
k3 = k2;
k2 = v29;
k0 = v28;
++buf_idx;
}
key[0] += k0;
key[1] += k1;
key[2] += k2;
key[3] += k3;
key[4] += k4;
var ft = new FILETIME {
DateTimeLow = key[1],
DateTimeHigh = key[0] & 0x7FFFFFFF
};
var sys_time = new SYSTEMTIME (ft);
key[5] = (uint)(sys_time.Year | sys_time.Month << 16);
key[7] = (uint)(sys_time.Hour | sys_time.Minute << 16);
key[8] = (uint)(sys_time.Second | sys_time.Milliseconds << 16);
uint flags = LittleEndian.ToUInt32 (data, index+40) | 0x80000000;
// uint rgb = BigEndian.ToUInt32 (data, index+44) >> 8;
uint rgb = buf[1] >> 8;
if (0 == (flags & 0x78000000))
flags |= 0x98000000;
key[6] = RegionCrc32 (m_scheme.Region, flags, rgb);
key[9] = (uint)(((int)key[2] * (long)(int)key[3]) >> 8);
if (m_scheme.Version >= 2390)
key[6] += key[9];
unsafe
{
fixed (byte* data_fixed = data)
{
uint* encoded = (uint*)(data_fixed+index);
for (i = 0; i < 10; ++i)
{
encoded[i] ^= key[i];
}
}
}
}
static readonly uint[] CustomCrcTable = InitCrcTable();
static uint[] InitCrcTable ()
{
var table = new uint[0x100];
for (uint i = 0; i != 256; ++i)
{
uint poly = i;
for (int j = 0; j < 8; ++j)
{
uint bit = poly & 1;
poly = poly >> 1 | poly << 31; // ror 1
if (0 == bit)
poly ^= 0x6DB88320;
}
table[i] = poly;
}
return table;
}
uint RegionCrc32 (byte[] src, uint flags, uint rgb)
{
int src_alpha = (int)flags & 0x1ff;
int dst_alpha = (int)(flags >> 12) & 0x1ff;
flags >>= 24;
if (0 == (flags & 0x10))
dst_alpha = 0;
if (0 == (flags & 8))
src_alpha = 0x100;
int y_step = 0;
int x_step = 4;
int width = 48;
int pos = 0;
if (0 != (flags & 0x40)) // horizontal flip
{
y_step += width;
pos += (width-1)*4;
x_step = -x_step;
}
if (0 != (flags & 0x20)) // vertical flip
{
y_step -= width;
pos += width*0x2f*4; // width*(height-1)*4;
}
y_step <<= 3;
uint checksum = 0;
for (int y = 0; y < 48; ++y)
{
for (int x = 0; x < 48; ++x)
{
int alpha = src[pos+3] * src_alpha;
alpha >>= 8;
uint color = rgb;
for (int i = 0; i < 3; ++i)
{
int v = src[pos+i];
int c = (int)(color & 0xff); // rgb[i];
c -= v;
c = (c * dst_alpha) >> 8;
c = (c + v) & 0xff;
c = (c * alpha) >> 8;
checksum = (checksum >> 8) ^ CustomCrcTable[(c ^ checksum) & 0xff];
color >>= 8;
}
pos += x_step;
}
pos += y_step;
}
return checksum;
}
[StructLayout(LayoutKind.Sequential)]
private struct FILETIME
{
public uint DateTimeLow;
public uint DateTimeHigh;
}
[StructLayout(LayoutKind.Sequential)]
private struct SYSTEMTIME
{
[MarshalAs(UnmanagedType.U2)] public ushort Year;
[MarshalAs(UnmanagedType.U2)] public ushort Month;
[MarshalAs(UnmanagedType.U2)] public ushort DayOfWeek;
[MarshalAs(UnmanagedType.U2)] public ushort Day;
[MarshalAs(UnmanagedType.U2)] public ushort Hour;
[MarshalAs(UnmanagedType.U2)] public ushort Minute;
[MarshalAs(UnmanagedType.U2)] public ushort Second;
[MarshalAs(UnmanagedType.U2)] public ushort Milliseconds;
public SYSTEMTIME (FILETIME ft)
{
FileTimeToSystemTime (ref ft, out this);
}
[DllImport ("kernel32.dll", CallingConvention = CallingConvention.Winapi, SetLastError = true)]
static extern bool FileTimeToSystemTime (ref FILETIME lpFileTime, out SYSTEMTIME lpSystemTime);
}
uint NextRand ()
{
Rand = 1566083941u * Rand + 1u;
return Rand;
}
uint GetMaxIndexLength (int version)
{
int max_index_entries = version < 150 ? 8192 : 16384;
return (uint)((m_scheme.EntryNameSize + 0x18) * max_index_entries);
}
public static EncryptionScheme[] KnownSchemes = new EncryptionScheme[]
{
EncryptionScheme.Create ("ShiinaRio v2.37", 2370, 0x10,
"Crypt Type 20011002 - Copyright(C) 2000 Y.Yamada/STUDIO よしくん",
new uint[] { 0xF182C682, 0xE882AA82, 0x718E5896, 0x8183CC82, 0xDAC98283 },
"ShiinaRio1.png", "ShiinaRio2.png", "DecodeV1.bin"),
EncryptionScheme.Create ("ShiinaRio v2.40", 2400, 0x20,
"Crypt Type 20011002 - Copyright(C) 2000 Y.Yamada/STUDIO よしくん",
new uint[] { 0x747C887C, 0xA47EA17C, 0xAF7CA77C, 0xA17C747C, 0x0000A47E },
"ShiinaRio3.jpg", "ShiinaRio2.png", "DecodeV1.bin"),
};
}
}
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