mirror of
https://github.com/crskycode/GARbro.git
synced 2024-12-26 04:44:14 +08:00
724 lines
27 KiB
C#
724 lines
27 KiB
C#
//! \file ArcNPA.cs
|
|
//! \date Fri Jul 18 04:07:42 2014
|
|
//! \brief NPA archive format implementation.
|
|
//
|
|
// Copyright (C) 2014 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.IO;
|
|
using System.Linq;
|
|
using System.Text;
|
|
using System.ComponentModel.Composition;
|
|
using System.Collections.Generic;
|
|
using System.Diagnostics;
|
|
using System.Runtime.InteropServices;
|
|
using GameRes.Compression;
|
|
using GameRes.Formats.Strings;
|
|
using GameRes.Formats.Properties;
|
|
using GameRes.Strings;
|
|
|
|
namespace GameRes.Formats.NitroPlus
|
|
{
|
|
internal class NpaEntry : PackedEntry
|
|
{
|
|
public byte[] RawName;
|
|
public int FolderId;
|
|
}
|
|
|
|
internal class NpaArchive : ArcFile
|
|
{
|
|
public EncryptionScheme Scheme { get; private set; }
|
|
public int Key { get; private set; }
|
|
public byte[] KeyTable { get { return m_key_table.Value; } }
|
|
|
|
private Lazy<byte[]> m_key_table;
|
|
|
|
public NpaArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir,
|
|
EncryptionScheme scheme, int key)
|
|
: base (arc, impl, dir)
|
|
{
|
|
Scheme = scheme;
|
|
Key = key;
|
|
m_key_table = new Lazy<byte[]> (() => NpaOpener.GenerateKeyTable (scheme));
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class EncryptionScheme
|
|
{
|
|
public NpaTitleId TitleId;
|
|
public uint NameKey;
|
|
public byte[] Order;
|
|
|
|
public EncryptionScheme (NpaTitleId id, uint key, byte[] order)
|
|
{
|
|
TitleId = id;
|
|
NameKey = key;
|
|
Order = order;
|
|
}
|
|
}
|
|
|
|
[Serializable]
|
|
public class NpaScheme : ResourceScheme
|
|
{
|
|
public Dictionary<string, EncryptionScheme> KnownSchemes;
|
|
}
|
|
|
|
public enum NpaTitleId
|
|
{
|
|
NotEncrypted,
|
|
CHAOSHEAD, CHAOSHEADTR1, CHAOSHEADTR2, MURAMASATR, MURAMASA, SUMAGA, DJANGO, DJANGOTR,
|
|
LAMENTO, SWEETPOOL, SUMAGASP, DEMONBANE, MURAMASAAD, AXANAEL, KIKOKUGAI, SONICOMITR2,
|
|
SUMAGA3P, SONICOMI, LOSTX, LOSTXTRAILER, DRAMATICALMURDER, TOTONO, PHENOMENO, NEKODA,
|
|
HANACHIRASU
|
|
}
|
|
|
|
public class NpaOptions : ResourceOptions
|
|
{
|
|
public EncryptionScheme Scheme { get; set; }
|
|
public bool CompressContents { get; set; }
|
|
public int Key1 { get; set; }
|
|
public int Key2 { get; set; }
|
|
}
|
|
|
|
[Export(typeof(ArchiveFormat))]
|
|
public class NpaOpener : ArchiveFormat
|
|
{
|
|
public override string Tag { get { return "NPA"; } }
|
|
public override string Description { get { return arcStrings.NPADescription; } }
|
|
public override uint Signature { get { return 0x0141504e; } } // NPA\x01
|
|
public override bool IsHierarchic { get { return true; } }
|
|
public override bool CanWrite { get { return true; } }
|
|
|
|
public static Dictionary<string, EncryptionScheme> KnownSchemes = new Dictionary<string, EncryptionScheme>();
|
|
|
|
public override ResourceScheme Scheme
|
|
{
|
|
get { return new NpaScheme { KnownSchemes = KnownSchemes }; }
|
|
set { KnownSchemes = ((NpaScheme)value).KnownSchemes; }
|
|
}
|
|
|
|
public const int DefaultKey1 = 0x4147414e;
|
|
public const int DefaultKey2 = 0x21214f54;
|
|
|
|
public override ArcFile TryOpen (ArcView file)
|
|
{
|
|
int key1 = file.View.ReadInt32 (7);
|
|
int key2 = file.View.ReadInt32 (11);
|
|
bool compressed = 0 != file.View.ReadByte (15);
|
|
bool encrypted = 0 != file.View.ReadByte (16);
|
|
int total_count = file.View.ReadInt32 (17);
|
|
int folder_count = file.View.ReadInt32 (21);
|
|
int file_count = file.View.ReadInt32 (25);
|
|
if (total_count < folder_count + file_count)
|
|
return null;
|
|
uint dir_size = file.View.ReadUInt32 (37);
|
|
if (dir_size >= file.MaxOffset)
|
|
return null;
|
|
|
|
EncryptionScheme enc = null;
|
|
var game_id = NpaTitleId.NotEncrypted;
|
|
if (encrypted)
|
|
{
|
|
enc = QueryGameEncryption (file.Name);
|
|
if (null == enc)
|
|
throw new OperationCanceledException (garStrings.MsgUnknownEncryption);
|
|
game_id = enc.TitleId;
|
|
}
|
|
|
|
int key = GetArchiveKey (game_id, key1, key2);
|
|
|
|
long cur_offset = 41;
|
|
var dir = new List<Entry> (file_count);
|
|
for (int i = 0; i < total_count; ++i)
|
|
{
|
|
int name_size = file.View.ReadInt32 (cur_offset);
|
|
if ((uint)name_size >= dir_size)
|
|
return null;
|
|
int type = file.View.ReadByte (cur_offset+4+name_size);
|
|
if (1 != type) // ignore directory entries
|
|
{
|
|
var raw_name = new byte[name_size];
|
|
file.View.Read (cur_offset+4, raw_name, 0, (uint)name_size);
|
|
for (int x = 0; x < name_size; ++x)
|
|
raw_name[x] += DecryptName (x, i, key);
|
|
var info_offset = cur_offset + 5 + name_size;
|
|
|
|
int id = file.View.ReadInt32 (info_offset);
|
|
uint offset = file.View.ReadUInt32 (info_offset+4);
|
|
uint size = file.View.ReadUInt32 (info_offset+8);
|
|
uint unpacked_size = file.View.ReadUInt32 (info_offset+12);
|
|
|
|
var entry = new NpaEntry {
|
|
Name = Encodings.cp932.GetString (raw_name),
|
|
Offset = dir_size+offset+41,
|
|
Size = size,
|
|
UnpackedSize = unpacked_size,
|
|
RawName = raw_name,
|
|
FolderId = id,
|
|
};
|
|
if (!entry.CheckPlacement (file.MaxOffset))
|
|
return null;
|
|
entry.Type = FormatCatalog.Instance.GetTypeFromName (entry.Name);
|
|
entry.IsPacked = compressed && entry.Type != "image";
|
|
dir.Add (entry);
|
|
}
|
|
cur_offset += 4 + name_size + 17;
|
|
}
|
|
if (enc != null)
|
|
return new NpaArchive (file, this, dir, enc, key);
|
|
else
|
|
return new ArcFile (file, this, dir);
|
|
}
|
|
|
|
public override void Create (Stream output, IEnumerable<Entry> list, ResourceOptions options,
|
|
EntryCallback callback)
|
|
{
|
|
var npa_options = GetOptions<NpaOptions> (options);
|
|
int callback_count = 0;
|
|
|
|
// build file index
|
|
var index = new Indexer (list, npa_options);
|
|
|
|
output.Position = 41 + index.Size;
|
|
long data_offset = 0;
|
|
|
|
// write files
|
|
foreach (var entry in index.Entries.Where (e => e.Type != "directory"))
|
|
{
|
|
if (data_offset > uint.MaxValue)
|
|
throw new FileSizeException();
|
|
if (null != callback)
|
|
callback (callback_count++, entry, arcStrings.MsgAddingFile);
|
|
using (var file = File.OpenRead (entry.Name))
|
|
{
|
|
var size = file.Length;
|
|
if (size > uint.MaxValue)
|
|
throw new FileSizeException();
|
|
entry.Offset = data_offset;
|
|
entry.UnpackedSize = (uint)size;
|
|
Stream destination = output;
|
|
if (null != npa_options.Scheme)
|
|
destination = new EncryptedStream (output, entry, npa_options.Scheme, index.Key);
|
|
try
|
|
{
|
|
if (entry.IsPacked)
|
|
{
|
|
var start = destination.Position;
|
|
using (var zstream = new ZLibStream (destination, CompressionMode.Compress,
|
|
CompressionLevel.Level9, true))
|
|
{
|
|
file.CopyTo (zstream);
|
|
}
|
|
entry.Size = (uint)(destination.Position - start);
|
|
}
|
|
else
|
|
{
|
|
file.CopyTo (destination);
|
|
entry.Size = entry.UnpackedSize;
|
|
}
|
|
}
|
|
finally
|
|
{
|
|
if (destination is EncryptedStream)
|
|
destination.Dispose();
|
|
}
|
|
data_offset += entry.Size;
|
|
}
|
|
}
|
|
if (null != callback)
|
|
callback (callback_count++, null, arcStrings.MsgWritingIndex);
|
|
|
|
output.Position = 0;
|
|
using (var header = new BinaryWriter (output, Encoding.ASCII, true))
|
|
{
|
|
header.Write (Signature);
|
|
header.Write ((short)0);
|
|
header.Write ((byte)0);
|
|
header.Write (npa_options.Key1);
|
|
header.Write (npa_options.Key2);
|
|
header.Write (npa_options.CompressContents);
|
|
header.Write (npa_options.Scheme != null);
|
|
header.Write (index.TotalCount);
|
|
header.Write (index.FolderCount);
|
|
header.Write (index.FileCount);
|
|
header.Write ((long)0);
|
|
header.Write (index.Size);
|
|
int entry_number = 0;
|
|
foreach (var entry in index.Entries)
|
|
{
|
|
header.Write (entry.RawName.Length);
|
|
for (int i = 0; i < entry.RawName.Length; ++i)
|
|
{
|
|
header.Write ((byte)(entry.RawName[i] - DecryptName (i, entry_number, index.Key)));
|
|
}
|
|
header.Write ((byte)("directory" == entry.Type ? 1 : 2));
|
|
header.Write (entry.FolderId);
|
|
header.Write ((uint)entry.Offset);
|
|
header.Write (entry.Size);
|
|
header.Write (entry.UnpackedSize);
|
|
++entry_number;
|
|
}
|
|
}
|
|
}
|
|
|
|
public override Stream OpenEntry (ArcFile arc, Entry entry)
|
|
{
|
|
Stream input;
|
|
if (arc is NpaArchive && entry is NpaEntry)
|
|
input = new EncryptedStream (arc as NpaArchive, entry as NpaEntry);
|
|
else
|
|
input = arc.File.CreateStream (entry.Offset, entry.Size);
|
|
return UnpackEntry (input, entry as PackedEntry);
|
|
}
|
|
|
|
private Stream UnpackEntry (Stream input, PackedEntry entry)
|
|
{
|
|
if (null != entry && entry.IsPacked)
|
|
return new ZLibStream (input, CompressionMode.Decompress);
|
|
return input;
|
|
}
|
|
|
|
internal static byte DecryptName (int index, int curfile, int arc_key)
|
|
{
|
|
int key = 0xFC*index;
|
|
|
|
key -= arc_key >> 0x18;
|
|
key -= arc_key >> 0x10;
|
|
key -= arc_key >> 0x08;
|
|
key -= arc_key & 0xff;
|
|
|
|
key -= curfile >> 0x18;
|
|
key -= curfile >> 0x10;
|
|
key -= curfile >> 0x08;
|
|
key -= curfile;
|
|
|
|
return (byte)(key & 0xff);
|
|
}
|
|
|
|
internal static int GetArchiveKey (NpaTitleId game_id, int key1, int key2)
|
|
{
|
|
if (NpaTitleId.LAMENTO == game_id)
|
|
return key1 + key2;
|
|
else
|
|
return key1 * key2;
|
|
}
|
|
|
|
internal static byte GetKeyFromEntry (NpaEntry entry, EncryptionScheme scheme, int arc_key)
|
|
{
|
|
int key = (int)scheme.NameKey;
|
|
var name = entry.RawName;
|
|
for (int i = 0; i < name.Length; ++i)
|
|
key -= name[i];
|
|
|
|
key *= name.Length;
|
|
|
|
if (scheme.TitleId != NpaTitleId.LAMENTO) // if the game is not Lamento
|
|
{
|
|
key += arc_key;
|
|
key *= (int)entry.UnpackedSize;
|
|
}
|
|
return (byte)key;
|
|
}
|
|
|
|
public static byte[] GenerateKeyTable (EncryptionScheme scheme)
|
|
{
|
|
byte[] order = scheme.Order;
|
|
if (null == order)
|
|
throw new ArgumentException ("Encryption key table not defined", "title_id");
|
|
|
|
var table = new byte[256];
|
|
for (int i = 0; i < 256; ++i)
|
|
{
|
|
int edx = i << 4;
|
|
int dl = (edx + order[i & 0x0f]) & 0xff;
|
|
int dh = (edx + (order[i>>4] << 8)) & 0xff00;
|
|
edx = (dh | dl) >> 4;
|
|
var eax = BaseTable[i];
|
|
table[eax] = (byte)(edx & 0xff);
|
|
}
|
|
for (int i = 17; i < order.Length; i+=2)
|
|
{
|
|
int ecx = order[i-1];
|
|
int edx = order[i];
|
|
byte tmp = table[ecx];
|
|
table[ecx] = table[edx];
|
|
table[edx] = tmp;
|
|
}
|
|
if (NpaTitleId.TOTONO == scheme.TitleId)
|
|
{
|
|
var totono_table = new byte[256];
|
|
for (int i = 0; i < 256; ++i)
|
|
{
|
|
byte r = table[i];
|
|
r = table[r];
|
|
r = table[r];
|
|
totono_table[i] = (byte)~r;
|
|
}
|
|
table = totono_table;
|
|
}
|
|
return table;
|
|
}
|
|
|
|
public override ResourceOptions GetDefaultOptions ()
|
|
{
|
|
return new NpaOptions {
|
|
Scheme = GetScheme (Settings.Default.NPAScheme),
|
|
CompressContents = Settings.Default.NPACompressContents,
|
|
Key1 = (int)Settings.Default.NPAKey1,
|
|
Key2 = (int)Settings.Default.NPAKey2,
|
|
};
|
|
}
|
|
|
|
public override object GetAccessWidget ()
|
|
{
|
|
return new GUI.WidgetNPA();
|
|
}
|
|
|
|
public override object GetCreationWidget ()
|
|
{
|
|
return new GUI.CreateNPAWidget();
|
|
}
|
|
|
|
EncryptionScheme QueryGameEncryption (string arc_name)
|
|
{
|
|
EncryptionScheme scheme = null;
|
|
var title = FormatCatalog.Instance.LookupGame (arc_name);
|
|
if (!string.IsNullOrEmpty (title))
|
|
scheme = GetScheme (title);
|
|
if (null == scheme)
|
|
{
|
|
var options = Query<NpaOptions> (arcStrings.ArcEncryptedNotice);
|
|
scheme = options.Scheme;
|
|
}
|
|
return scheme;
|
|
}
|
|
|
|
public static NpaTitleId GetTitleId (string title)
|
|
{
|
|
var scheme = GetScheme (title);
|
|
return scheme != null ? scheme.TitleId : NpaTitleId.NotEncrypted;
|
|
}
|
|
|
|
public static EncryptionScheme GetScheme (string title)
|
|
{
|
|
EncryptionScheme scheme;
|
|
if (KnownSchemes.TryGetValue (title, out scheme))
|
|
return scheme;
|
|
else
|
|
return null;
|
|
}
|
|
|
|
static readonly byte[] BaseTable = {
|
|
0x6F,0x05,0x6A,0xBF,0xA1,0xC7,0x8E,0xFB,0xD4,0x2F,0x80,0x58,0x4A,0x17,0x3B,0xB1,
|
|
0x89,0xEC,0xA0,0x9F,0xD3,0xFC,0xC2,0x04,0x68,0x03,0xF3,0x25,0xBE,0x24,0xF1,0xBD,
|
|
0xB8,0x41,0xC9,0x27,0x0E,0xA3,0xD8,0x7F,0x5B,0x8F,0x16,0x49,0xAA,0xB2,0x18,0xA7,
|
|
0x33,0xE4,0xDB,0x48,0xCA,0xDE,0xAE,0xCD,0x13,0x1F,0x15,0x2E,0x39,0xF5,0x1E,0xDD,
|
|
0x0F,0x88,0x4C,0x98,0x36,0xB4,0x3F,0x09,0x83,0xFD,0x32,0xBA,0x14,0x30,0x7A,0x63,
|
|
0xB9,0x56,0x95,0x61,0xCC,0x8B,0xEF,0xDA,0xE5,0x2C,0xDC,0x12,0x1A,0x67,0x23,0x50,
|
|
0xD1,0xC3,0x7E,0x6D,0xB6,0x90,0x3C,0xB3,0x0B,0xE2,0x91,0x70,0xA8,0xDF,0x44,0xC4,
|
|
0xF4,0x01,0x5C,0x10,0x06,0xE7,0x54,0x40,0x43,0x72,0x38,0xBC,0xE3,0x07,0xFA,0x34,
|
|
0x02,0xA4,0xF7,0x74,0xA9,0x4D,0x42,0xA5,0x85,0x35,0x79,0xD2,0x76,0x97,0x45,0x4F,
|
|
0x08,0x5A,0xB0,0xEE,0x51,0x73,0x69,0x9E,0x94,0x47,0x77,0x29,0xD9,0x64,0x11,0xEB,
|
|
0x37,0xAC,0x20,0x62,0x9A,0x6B,0x9C,0x75,0x22,0x87,0xAB,0x78,0x53,0xC8,0x5D,0xAD,
|
|
0x2A,0xF2,0xCB,0xB7,0x0D,0xED,0x86,0x55,0xFF,0x19,0x57,0xD7,0xD5,0x60,0xC6,0x3D,
|
|
0xEA,0xC1,0x6C,0xE1,0xC0,0x65,0x84,0xC5,0xE0,0x3E,0x7D,0x28,0x66,0xAF,0x1C,0x9B,
|
|
0xCF,0x81,0x4E,0x26,0x59,0x2B,0x5F,0x7B,0xE8,0x8D,0x52,0x7C,0xF8,0x82,0x0C,0xF9,
|
|
0x8C,0xE9,0xB5,0xE6,0x31,0x93,0x46,0x5E,0x1D,0x1B,0x4B,0x71,0xD6,0x92,0x3A,0xA6,
|
|
0x2D,0x00,0x9D,0xBB,0x6E,0xF0,0x99,0xCE,0x21,0x0A,0xD0,0xF6,0xFE,0xA2,0x8A,0x96,
|
|
};
|
|
}
|
|
|
|
/// <summary>
|
|
/// Archive creation helper.
|
|
/// </summary>
|
|
internal class Indexer
|
|
{
|
|
List<NpaEntry> m_entries;
|
|
Encoding m_encoding = Encodings.cp932.WithFatalFallback();
|
|
int m_key;
|
|
int m_size = 0;
|
|
int m_directory_count = 0;
|
|
int m_file_count = 0;
|
|
|
|
public IEnumerable<NpaEntry> Entries { get { return m_entries; } }
|
|
|
|
public int Key { get { return m_key; } }
|
|
public int Size { get { return m_size; } }
|
|
public int TotalCount { get { return m_entries.Count; } }
|
|
public int FolderCount { get { return m_directory_count; } }
|
|
public int FileCount { get { return m_file_count; } }
|
|
|
|
public Indexer (IEnumerable<Entry> source_list, NpaOptions options)
|
|
{
|
|
m_entries = new List<NpaEntry> (source_list.Count());
|
|
var title_id = null != options.Scheme ? options.Scheme.TitleId : NpaTitleId.NotEncrypted;
|
|
m_key = NpaOpener.GetArchiveKey (title_id, options.Key1, options.Key2);
|
|
|
|
foreach (var entry in source_list)
|
|
{
|
|
string name = entry.Name;
|
|
try
|
|
{
|
|
var dir = Path.GetDirectoryName (name);
|
|
int folder_id = 0;
|
|
if (!string.IsNullOrEmpty (dir))
|
|
folder_id = AddDirectory (dir);
|
|
|
|
bool compress = options.CompressContents;
|
|
if (compress) // don't compress images
|
|
compress = !FormatCatalog.Instance.LookupFileName (name).OfType<ImageFormat>().Any();
|
|
var npa_entry = new NpaEntry
|
|
{
|
|
Name = name,
|
|
IsPacked = compress,
|
|
RawName = m_encoding.GetBytes (name),
|
|
FolderId = folder_id,
|
|
};
|
|
++m_file_count;
|
|
AddEntry (npa_entry);
|
|
}
|
|
catch (EncoderFallbackException X)
|
|
{
|
|
throw new InvalidFileName (name, arcStrings.MsgIllegalCharacters, X);
|
|
}
|
|
}
|
|
}
|
|
|
|
void AddEntry (NpaEntry entry)
|
|
{
|
|
m_entries.Add (entry);
|
|
m_size += 4 + entry.RawName.Length + 17;
|
|
}
|
|
|
|
Dictionary<string, int> m_directory_map = new Dictionary<string, int>();
|
|
|
|
int AddDirectory (string dir)
|
|
{
|
|
int folder_id = 0;
|
|
if (m_directory_map.TryGetValue (dir, out folder_id))
|
|
return folder_id;
|
|
string path = "";
|
|
foreach (var component in dir.Split (Path.DirectorySeparatorChar))
|
|
{
|
|
path = Path.Combine (path, component);
|
|
if (m_directory_map.TryGetValue (path, out folder_id))
|
|
continue;
|
|
folder_id = ++m_directory_count;
|
|
m_directory_map[path] = folder_id;
|
|
|
|
var npa_entry = new NpaEntry
|
|
{
|
|
Name = path,
|
|
Type = "directory",
|
|
Offset = 0,
|
|
Size = 0,
|
|
UnpackedSize = 0,
|
|
IsPacked = false,
|
|
RawName = m_encoding.GetBytes (path),
|
|
FolderId = folder_id,
|
|
};
|
|
AddEntry (npa_entry);
|
|
}
|
|
return folder_id;
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Stream class for files stored in encrypted NPA archives.
|
|
/// </summary>
|
|
internal class EncryptedStream : Stream
|
|
{
|
|
private Stream m_stream;
|
|
private Lazy<byte[]> m_encrypted;
|
|
private int m_encrypted_length;
|
|
private bool m_read_mode;
|
|
private long m_base_pos;
|
|
|
|
public override bool CanRead { get { return m_read_mode && m_stream.CanRead; } }
|
|
public override bool CanSeek { get { return m_stream.CanSeek; } }
|
|
public override bool CanWrite { get { return !m_read_mode && m_stream.CanWrite; } }
|
|
public override long Length { get { return m_stream.Length - m_base_pos; } }
|
|
public override long Position
|
|
{
|
|
get { return m_stream.Position - m_base_pos; }
|
|
set { m_stream.Position = m_base_pos + value; }
|
|
}
|
|
|
|
delegate byte CryptFunc (int index, byte value);
|
|
CryptFunc Encrypt;
|
|
|
|
public EncryptedStream (NpaArchive arc, NpaEntry entry)
|
|
{
|
|
m_read_mode = true;
|
|
m_encrypted_length = GetEncryptedLength (entry, arc.Scheme.TitleId);
|
|
if (m_encrypted_length > entry.Size)
|
|
m_encrypted_length = (int)entry.Size;
|
|
int key = NpaOpener.GetKeyFromEntry (entry, arc.Scheme, arc.Key);
|
|
|
|
m_stream = arc.File.CreateStream (entry.Offset, entry.Size);
|
|
m_encrypted = new Lazy<byte[]> (() => InitEncrypted (key, arc.Scheme.TitleId, arc.KeyTable));
|
|
m_base_pos = m_stream.Position;
|
|
}
|
|
|
|
public EncryptedStream (Stream output, NpaEntry entry, EncryptionScheme scheme, int arc_key)
|
|
{
|
|
m_read_mode = false;
|
|
m_encrypted_length = GetEncryptedLength (entry, scheme.TitleId);
|
|
int key = NpaOpener.GetKeyFromEntry (entry, scheme, arc_key);
|
|
|
|
m_stream = output;
|
|
m_encrypted = new Lazy<byte[]> (() => new byte[m_encrypted_length]);
|
|
m_base_pos = m_stream.Position;
|
|
|
|
byte[] decrypt_table = NpaOpener.GenerateKeyTable (scheme);
|
|
byte[] encrypt_table = new byte[256];
|
|
for (int i = 0; i < 256; ++i)
|
|
encrypt_table[decrypt_table[i]] = (byte)i;
|
|
|
|
if (NpaTitleId.LAMENTO == scheme.TitleId)
|
|
{
|
|
Encrypt = (i, x) => encrypt_table[(x + key) & 0xff];
|
|
}
|
|
else
|
|
{
|
|
Encrypt = (i, x) => encrypt_table[(x + key + i) & 0xff];
|
|
}
|
|
}
|
|
|
|
int GetEncryptedLength (NpaEntry entry, NpaTitleId game_id)
|
|
{
|
|
int length = 0x1000;
|
|
if (game_id != NpaTitleId.LAMENTO)
|
|
length += entry.RawName.Length;
|
|
return length;
|
|
}
|
|
|
|
byte[] InitEncrypted (int key, NpaTitleId game_id, byte[] key_table)
|
|
{
|
|
var position = Position;
|
|
if (0 != position)
|
|
Position = 0;
|
|
byte[] buffer = new byte[m_encrypted_length];
|
|
m_encrypted_length = m_stream.Read (buffer, 0, m_encrypted_length);
|
|
Position = position;
|
|
|
|
if (game_id == NpaTitleId.LAMENTO)
|
|
{
|
|
for (int i = 0; i < m_encrypted_length; i++)
|
|
buffer[i] = (byte)(key_table[buffer[i]] - key);
|
|
}
|
|
else
|
|
{
|
|
for (int i = 0; i < m_encrypted_length; i++)
|
|
buffer[i] = (byte)(key_table[buffer[i]] - key - i);
|
|
}
|
|
return buffer;
|
|
}
|
|
|
|
#region System.IO.Stream methods
|
|
public override void Flush()
|
|
{
|
|
m_stream.Flush();
|
|
}
|
|
|
|
public override long Seek (long offset, SeekOrigin origin)
|
|
{
|
|
if (SeekOrigin.Begin == origin)
|
|
offset += m_base_pos;
|
|
offset = m_stream.Seek (offset, origin);
|
|
return offset - m_base_pos;
|
|
}
|
|
|
|
public override void SetLength (long length)
|
|
{
|
|
throw new NotSupportedException ("EncryptedStream.SetLength is not supported");
|
|
}
|
|
|
|
public override int Read (byte[] buffer, int offset, int count)
|
|
{
|
|
var position = Position;
|
|
if (position >= m_encrypted_length)
|
|
return m_stream.Read (buffer, offset, count);
|
|
int read = Math.Min (m_encrypted_length - (int)position, count);
|
|
Buffer.BlockCopy (m_encrypted.Value, (int)position, buffer, offset, read);
|
|
m_stream.Seek (read, SeekOrigin.Current);
|
|
if (read < count)
|
|
{
|
|
read += m_stream.Read (buffer, offset+read, count-read);
|
|
}
|
|
return read;
|
|
}
|
|
|
|
public override int ReadByte ()
|
|
{
|
|
var position = Position;
|
|
if (position >= m_encrypted_length)
|
|
return m_stream.ReadByte();
|
|
m_stream.Seek (1, SeekOrigin.Current);
|
|
return m_encrypted.Value[(int)position];
|
|
}
|
|
|
|
public override void Write (byte[] buffer, int offset, int count)
|
|
{
|
|
var position = Position;
|
|
if (position < m_encrypted_length)
|
|
{
|
|
int limit = (int)position + Math.Min (m_encrypted_length - (int)position, count);
|
|
for (int i = (int)position; i < limit; ++i, ++offset, --count)
|
|
{
|
|
m_encrypted.Value[i] = Encrypt (i, buffer[offset]);
|
|
}
|
|
m_stream.Write (m_encrypted.Value, (int)position, limit-(int)position);
|
|
}
|
|
if (count > 0)
|
|
m_stream.Write (buffer, offset, count);
|
|
}
|
|
|
|
public override void WriteByte (byte value)
|
|
{
|
|
var position = Position;
|
|
if (position < m_encrypted_length)
|
|
value = Encrypt ((int)position, value);
|
|
m_stream.WriteByte (value);
|
|
}
|
|
#endregion
|
|
|
|
#region IDisposable Members
|
|
bool disposed = false;
|
|
protected override void Dispose (bool disposing)
|
|
{
|
|
if (!disposed)
|
|
{
|
|
if (disposing && m_read_mode)
|
|
{
|
|
m_stream.Dispose();
|
|
}
|
|
m_encrypted = null;
|
|
disposed = true;
|
|
base.Dispose (disposing);
|
|
}
|
|
}
|
|
#endregion
|
|
}
|
|
}
|