mirror of
https://github.com/crskycode/GARbro.git
synced 2024-11-27 07:34:00 +08:00
(AFA): implemented archives version 3 (#216)
This commit is contained in:
morkt
parent
2bdd94af99
commit
631dc5755d
@ -2,7 +2,7 @@
|
||||
//! \date Mon Apr 25 18:18:57 2016
|
||||
//! \brief AliceSoft System 4 engine resource archive.
|
||||
//
|
||||
// Copyright (C) 2016 by morkt
|
||||
// Copyright (C) 2016-2018 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
|
||||
@ -43,7 +43,7 @@ namespace GameRes.Formats.AliceSoft
|
||||
public override ArcFile TryOpen (ArcView file)
|
||||
{
|
||||
if (!file.View.AsciiEqual (8, "AlicArch"))
|
||||
return null;
|
||||
return TryOpenV3 (file);
|
||||
if (!file.View.AsciiEqual (0x1C, "INFO"))
|
||||
return null;
|
||||
int version = file.View.ReadInt32 (0x10);
|
||||
@ -86,6 +86,18 @@ namespace GameRes.Formats.AliceSoft
|
||||
}
|
||||
}
|
||||
|
||||
internal ArcFile TryOpenV3 (ArcView file)
|
||||
{
|
||||
if (file.View.ReadInt32 (8) != 3)
|
||||
return null;
|
||||
uint index_size = file.View.ReadUInt32 (4);
|
||||
var index = new AfaIndexReader (file, index_size);
|
||||
var dir = index.Read();
|
||||
if (null == dir || 0 == dir.Count)
|
||||
return null;
|
||||
return new ArcFile (file, this, dir);
|
||||
}
|
||||
|
||||
static readonly byte[] AffKey = {
|
||||
0xC8, 0xBB, 0x8F, 0xB7, 0xED, 0x43, 0x99, 0x4A,
|
||||
0xA2, 0x7E, 0x5B, 0xB0, 0x68, 0x18, 0xF8, 0x88
|
||||
@ -106,4 +118,195 @@ namespace GameRes.Formats.AliceSoft
|
||||
return new PrefixStream (prefix, rest);
|
||||
}
|
||||
}
|
||||
|
||||
internal sealed class AfaIndexReader
|
||||
{
|
||||
ArcView m_file;
|
||||
uint m_data_offset;
|
||||
byte[] m_dict;
|
||||
|
||||
public AfaIndexReader (ArcView file, uint index_size)
|
||||
{
|
||||
m_file = file;
|
||||
m_data_offset = index_size + 8;
|
||||
}
|
||||
|
||||
public List<Entry> Read ()
|
||||
{
|
||||
byte[] packed;
|
||||
using (var input = m_file.CreateStream (12, m_data_offset-12))
|
||||
using (var bits = new MsbBitStream (input))
|
||||
{
|
||||
bits.GetNextBit();
|
||||
m_dict = ReadBytes (bits);
|
||||
if (null == m_dict)
|
||||
return null;
|
||||
int packed_size = ReadInt32 (bits);
|
||||
int unpacked_size = ReadInt32 (bits);
|
||||
packed = new byte[packed_size];
|
||||
for (int i = 0; i < packed_size; ++i)
|
||||
{
|
||||
packed[i] = (byte)bits.GetBits (8);
|
||||
}
|
||||
}
|
||||
using (var bstr = new BinMemoryStream (packed))
|
||||
using (var zstr = new ZLibStream (bstr, CompressionMode.Decompress))
|
||||
using (var index = new MsbBitStream (zstr))
|
||||
{
|
||||
index.GetNextBit();
|
||||
int count = ReadInt32 (index);
|
||||
if (!ArchiveFormat.IsSaneCount (count))
|
||||
return null;
|
||||
var dir = new List<Entry> (count);
|
||||
for (int i = 0; i < count; ++i)
|
||||
{
|
||||
if (index.GetBits (2) == -1)
|
||||
break;
|
||||
var name_buf = ReadEncryptedChars (index);
|
||||
if (null == name_buf)
|
||||
return null;
|
||||
var name = DecryptString (name_buf, name_buf.Length);
|
||||
var entry = FormatCatalog.Instance.Create<Entry> (name);
|
||||
ReadInt32 (index);
|
||||
ReadInt32 (index);
|
||||
entry.Offset = (uint)ReadInt32 (index) + m_data_offset;
|
||||
entry.Size = (uint)ReadInt32 (index);
|
||||
if (!entry.CheckPlacement (m_file.MaxOffset))
|
||||
return null;
|
||||
dir.Add (entry);
|
||||
}
|
||||
return dir;
|
||||
}
|
||||
}
|
||||
|
||||
byte[] ReadBytes (MsbBitStream input)
|
||||
{
|
||||
int buf_size = ReadInt32 (input);
|
||||
var buf = new byte[buf_size];
|
||||
int dst = 0;
|
||||
var rnd = new RandomGenerator ((uint)buf_size);
|
||||
while (dst < buf_size)
|
||||
{
|
||||
int count = (int)rnd.GetNext() & 3;
|
||||
int skipped = input.GetBits (count + 1);
|
||||
if (-1 == skipped)
|
||||
return null;
|
||||
rnd.GetNext();
|
||||
|
||||
int v = input.GetBits (8);
|
||||
if (-1 == v)
|
||||
return null;
|
||||
buf[dst++] = (byte)v;
|
||||
}
|
||||
return buf;
|
||||
}
|
||||
|
||||
ushort[] ReadEncryptedChars (MsbBitStream input)
|
||||
{
|
||||
int buf_size = ReadInt32 (input);
|
||||
var buf = new ushort[buf_size];
|
||||
int dst = 0;
|
||||
var rnd = new RandomGenerator ((uint)buf_size);
|
||||
while (dst < buf_size)
|
||||
{
|
||||
int count = (int)rnd.GetNext() & 3;
|
||||
int skipped = input.GetBits (count + 1);
|
||||
if (-1 == skipped)
|
||||
return null;
|
||||
rnd.GetNext();
|
||||
|
||||
int lo = input.GetBits (8);
|
||||
int hi = input.GetBits (8);
|
||||
if (-1 == lo || -1 == hi)
|
||||
return null;
|
||||
buf[dst++] = (ushort)(lo | hi << 8);
|
||||
}
|
||||
return buf;
|
||||
}
|
||||
|
||||
byte[] m_string_buf = new byte[0x100];
|
||||
|
||||
string DecryptString (ushort[] input, int input_length)
|
||||
{
|
||||
if (m_string_buf.Length < input_length)
|
||||
m_string_buf = new byte[input_length];
|
||||
for (int i = 0; i < input_length; ++i)
|
||||
{
|
||||
m_string_buf[i] = (byte)(m_dict[input[i]] ^ 0xA4);
|
||||
}
|
||||
return Encodings.cp932.GetString (m_string_buf, 0, input_length);
|
||||
}
|
||||
|
||||
static int ReadInt32 (MsbBitStream input)
|
||||
{
|
||||
int b0 = input.GetBits (8);
|
||||
int b1 = input.GetBits (8);
|
||||
int b2 = input.GetBits (8);
|
||||
int b3 = input.GetBits (8);
|
||||
return b3 << 24 | b2 << 16 | b1 << 8 | b0;
|
||||
}
|
||||
}
|
||||
|
||||
internal class RandomGenerator
|
||||
{
|
||||
uint[] m_state = new uint[521];
|
||||
int m_current;
|
||||
|
||||
public RandomGenerator (uint seed)
|
||||
{
|
||||
Init (seed);
|
||||
}
|
||||
|
||||
public void Init (uint seed)
|
||||
{
|
||||
uint val = 0;
|
||||
for (int i = 0; i < 17; ++i)
|
||||
{
|
||||
for (int j = 0; j < 32; ++j)
|
||||
{
|
||||
seed = 1566083941u * seed + 1;
|
||||
val = seed & 0x80000000 | (val >> 1);
|
||||
}
|
||||
m_state[i] = val;
|
||||
}
|
||||
m_state[16] = m_state[15] ^ (m_state[0] >> 9) ^ (m_state[16] << 23);
|
||||
for (int i = 17; i < 521; ++i)
|
||||
{
|
||||
m_state[i] = m_state[i-1] ^ (m_state[i-16] >> 9) ^ (m_state[i-17] << 23);
|
||||
}
|
||||
Shuffle();
|
||||
Shuffle();
|
||||
Shuffle();
|
||||
Shuffle();
|
||||
m_current = -1;
|
||||
}
|
||||
|
||||
public uint GetNext ()
|
||||
{
|
||||
++m_current;
|
||||
if (m_current >= 521)
|
||||
{
|
||||
Shuffle();
|
||||
m_current = 0;
|
||||
}
|
||||
return m_state[m_current];
|
||||
}
|
||||
|
||||
void Shuffle ()
|
||||
{
|
||||
for (int i = 0; i < 32; i += 4)
|
||||
{
|
||||
m_state[i ] ^= m_state[i + 489];
|
||||
m_state[i+1] ^= m_state[i + 490];
|
||||
m_state[i+2] ^= m_state[i + 491];
|
||||
m_state[i+3] ^= m_state[i + 492];
|
||||
}
|
||||
for (int i = 32; i < 521; i += 3)
|
||||
{
|
||||
m_state[i ] ^= m_state[i - 32];
|
||||
m_state[i+1] ^= m_state[i - 31];
|
||||
m_state[i+2] ^= m_state[i - 30];
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user