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(PackOpener): tidy.

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This commit is contained in:
morkt 2018-11-17 00:42:44 +04:00
parent e302e0b574
commit 8f21e7558a
1 changed files with 56 additions and 50 deletions
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106
ArcFormats/Selene/ArcKCAP.cs
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@ -29,6 +29,7 @@ using System.ComponentModel.Composition;
using System.Security.Cryptography;
using System.IO;
using GameRes.Formats.Strings;
using GameRes.Utility;
namespace GameRes.Formats.Selene
{
@ -70,23 +71,25 @@ namespace GameRes.Formats.Selene
static private string DefaultPassPhrase = "Selene.Default.Password";
public static Dictionary<string,string> KnownSchemes = new Dictionary<string,string>();
public PackOpener ()
{
Extensions = new string[] { "pack" };
}
static KcapScheme DefaultScheme = new KcapScheme { KnownSchemes = new Dictionary<string,string>() };
public static Dictionary<string,string> KnownSchemes { get { return DefaultScheme.KnownSchemes; } }
public override ResourceScheme Scheme
{
get { return new KcapScheme { KnownSchemes = KnownSchemes }; }
set { KnownSchemes = ((KcapScheme)value).KnownSchemes; }
get { return DefaultScheme; }
set { DefaultScheme = (KcapScheme)value; }
}
public override ArcFile TryOpen (ArcView file)
{
int count = file.View.ReadInt32 (4);
if (count <= 0 || count > 0xfffff)
if (!IsSaneCount (count))
return null;
uint index_size = (uint)count * 0x54u;
if (index_size > file.View.Reserve (8, index_size))
@ -97,14 +100,10 @@ namespace GameRes.Formats.Selene
for (int i = 0; i < count; ++i)
{
string name = file.View.ReadString (index_offset, 0x40);
var entry = new KcapEntry
{
Name = name,
Type = FormatCatalog.Instance.GetTypeFromName (name),
Offset = file.View.ReadUInt32 (index_offset+0x48),
Size = file.View.ReadUInt32 (index_offset+0x4c),
Encrypted = 0 != file.View.ReadUInt32 (index_offset+0x50),
};
var entry = Create<KcapEntry> (name);
entry.Offset = file.View.ReadUInt32 (index_offset+0x48);
entry.Size = file.View.ReadUInt32 (index_offset+0x4C);
entry.Encrypted = 0 != file.View.ReadUInt32 (index_offset+0x50);
if (!entry.CheckPlacement (file.MaxOffset))
return null;
encrypted = encrypted || entry.Encrypted;
@ -148,77 +147,84 @@ namespace GameRes.Formats.Selene
};
}
static private byte[] CreateKeyTable (string pass) // (void *this, byte *a2)
static private byte[] CreateKeyTable (string pass)
{
if (pass.Length < 8)
pass = DefaultPassPhrase;
int pass_len = pass.Length;
int hash = PasskeyHash (pass); // sub_100E0390
var hash_table = new KeyTableGenerator (hash);
uint seed = PasskeyHash (pass);
var rng = new KeyTableGenerator ((int)seed);
byte[] table = new byte[0x10000];
for (int i = 0; i < table.Length; ++i)
{
int key = hash_table.Permutate(); // sub_100E06D0
table[i] = (byte)((byte)pass[i % pass_len] ^ (key >> 16));
int key = rng.Rand();
table[i] = (byte)(pass[i % pass_len] ^ (key >> 16));
}
return table;
}
static int PasskeyHash (string pass) // sub_100E0390(int a1, unsigned int a2)
static uint PasskeyHash (string pass)
{
int hash = -1; // eax@1
for (int i = 0; i < pass.Length; ++i) // ecx@1
{
hash = (byte)pass[i] ^ hash; // eax@2
for (int j = 0; j < 8; ++j)
hash = (int)(((uint)hash >> 1) ^ (0 != (hash & 1) ? 0xEDB88320u : 0u));
}
return ~hash;
var bytes = Encodings.cp932.GetBytes (pass);
return Crc32.Compute (bytes, 0, bytes.Length);
}
/// <summary>
/// Mersenne Twister with signed integer arithmetics, resulting in a different sequence.
/// </summary>
internal class KeyTableGenerator
{
private int[] m_table = new int[0x270];
const int StateLength = 624;
const int StateM = 397;
const int MatrixA = -1727483681;
const int TemperingMaskB = -1658038656;
const int TemperingMaskC = -272236544;
private int[] m_table = new int[StateLength];
private int m_pos;
public KeyTableGenerator (int first = 0)
public KeyTableGenerator (int seed = 0)
{
Init (first);
SRand (seed);
}
public void Init (int first)
public void SRand (int seed)
{
m_table[0] = first;
for (int i = 1; i < 0x270; ++i)
m_table[0] = seed;
for (int i = 1; i < StateLength; ++i)
m_table[i] = i + 0x6C078965 * (m_table[i-1] ^ (m_table[i-1] >> 30));
m_pos = 0x270;
m_pos = StateLength;
}
private static int[] v14 = new int[2] { 0, -1727483681 }; // [sp+4h] [bp-4h]@1
private static int[] mag01 = new int[2] { 0, MatrixA };
public int Permutate () // sub_100E06D0
public int Rand ()
{
if (m_pos >= 0x270)
if (m_pos >= StateLength)
{
for (int i = 0; i < 0xe3; ++i)
int i;
for (i = 0; i < StateLength - StateM; ++i)
{
int v5 = m_table[i] ^ m_table[i+1];
m_table[i] = m_table[i+0x18d] ^ v14[(m_table[i] ^ (byte)v5) & 1] ^ ((m_table[i] ^ v5 & 0x7FFFFFFF) >> 1);
int x = m_table[i] ^ m_table[i+1];
m_table[i] = m_table[i + StateM] ^ mag01[(m_table[i] ^ x) & 1]
^ ((m_table[i] ^ x & 0x7FFFFFFF) >> 1);
}
for (int i = 0; i < 0x18c; ++i)
for (; i < StateLength - 1; ++i)
{
int v6 = i + 0xe3;
int v8 = m_table[v6] ^ m_table[v6+1];
m_table[v6] = m_table[i] ^ v14[(m_table[v6] ^ (byte)v8) & 1] ^ ((m_table[v6] ^ v8 & 0x7FFFFFFF) >> 1);
int x = m_table[i] ^ m_table[i + 1];
m_table[i] = m_table[i + StateM - StateLength] ^ mag01[(m_table[i] ^ x) & 1]
^ ((m_table[i] ^ x & 0x7FFFFFFF) >> 1);
}
int v9 = m_table[0x26f] ^ (m_table[0] ^ m_table[0x26f]) & 0x7FFFFFFF;
m_table[0x26f] = (v9 >> 1) ^ m_table[0x18c] ^ v14[v9 & 1];
int z = m_table[StateLength - 1] ^ (m_table[0] ^ m_table[StateLength-1]) & 0x7FFFFFFF;
m_table[StateLength - 1] = m_table[StateM-1] ^ (z >> 1) ^ mag01[z & 1];
m_pos = 0;
}
int v11 = m_table[m_pos++]; // edx@7
int v12 = (int)((((((((v11 >> 11) ^ v11) & 0xFF3A58AD) << 7) ^ (v11 >> 11) ^ v11) & 0xFFFFDF8C) << 15) ^ ((((v11 >> 11) ^ v11) & 0xFF3A58AD) << 7) ^ (v11 >> 11) ^ v11); // edx@7
return v12 ^ (v12 >> 18);
int y = m_table[m_pos++];
y ^= y >> 11;
y ^= (y << 7) & TemperingMaskB;
y ^= (y << 15) & TemperingMaskC;
y ^= y >> 18;
return y;
}
}