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separated "CHERRY PACK 2.0" archives implementation.

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support archives with encrypted index.
This commit is contained in:
morkt 2015-11-19 11:41:47 +04:00
parent 6c6c6be7a0
commit 00f8965a9d
1 changed files with 115 additions and 14 deletions
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129
ArcFormats/Cherry/ArcCherry.cs
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@ -29,6 +29,7 @@ using System.ComponentModel.Composition;
using System.IO;
using System.Linq;
using GameRes.Utility;
using GameRes.Compression;
namespace GameRes.Formats.Cherry
{
@ -37,38 +38,41 @@ namespace GameRes.Formats.Cherry
{
public override string Tag { get { return "PAK/CHERRY"; } }
public override string Description { get { return "Cherry Soft PACK resource archive"; } }
public override uint Signature { get { return 0x52454843; } } // 'CHER'
public override uint Signature { get { return 0; } }
public override bool IsHierarchic { get { return false; } }
public override bool CanCreate { get { return false; } }
public PakOpener ()
{
Extensions = new string[] { "pak" };
Signatures = new uint[] { 0x52454843, 0 };
}
public override ArcFile TryOpen (ArcView file)
{
int index_offset = 0;
if (file.View.AsciiEqual (0, "CHERRY PACK 2.0"))
index_offset = 0x14;
int count = file.View.ReadInt32 (index_offset);
if (count <= 0 || count > 0xfffff)
int count = file.View.ReadInt32 (0);
if (!IsSaneCount (count))
return null;
long base_offset = file.View.ReadUInt32 (index_offset+4);
index_offset += 8;
long base_offset = file.View.ReadUInt32 (4);
if (base_offset >= file.MaxOffset || base_offset != (8 + count*0x18))
return null;
var dir = ReadIndex (file, 8, count, base_offset, file);
return dir != null ? new ArcFile (file, this, dir) : null;
}
protected List<Entry> ReadIndex (ArcView index, int index_offset, int count, long base_offset, ArcView file)
{
uint index_size = (uint)count * 0x18u;
if (index_size > file.View.Reserve (index_offset, index_size))
if (index_size > index.View.Reserve (index_offset, index_size))
return null;
string arc_name = Path.GetFileNameWithoutExtension (file.Name);
bool is_grp = arc_name.EndsWith ("GRP", StringComparison.InvariantCultureIgnoreCase);
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
string name = file.View.ReadString (index_offset, 0x10);
string name = index.View.ReadString (index_offset, 0x10);
if (0 == name.Length)
return null;
var offset = base_offset + file.View.ReadUInt32 (index_offset+0x10);
var offset = base_offset + index.View.ReadUInt32 (index_offset+0x10);
Entry entry;
if (is_grp)
{
@ -82,13 +86,13 @@ namespace GameRes.Formats.Cherry
{
entry = AutoEntry.Create (file, offset, name);
}
entry.Size = file.View.ReadUInt32 (index_offset+0x14);
entry.Size = index.View.ReadUInt32 (index_offset+0x14);
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
index_offset += 0x18;
}
return new ArcFile (file, this, dir);
return dir;
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
@ -109,4 +113,101 @@ namespace GameRes.Formats.Cherry
return new MemoryStream (data);
}
}
internal class CherryPak : ArcFile
{
public CherryPak (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir)
: base (arc, impl, dir)
{
}
}
[Export(typeof(ArchiveFormat))]
public class Pak2Opener : PakOpener
{
public override string Tag { get { return "PAK/CHERRY2"; } }
public override string Description { get { return "Cherry Soft PACK resource archive v2"; } }
public override uint Signature { get { return 0x52454843; } } // 'CHER'
public override bool IsHierarchic { get { return false; } }
public override bool CanCreate { get { return false; } }
public Pak2Opener ()
{
Extensions = new string[] { "pak" };
}
public override ArcFile TryOpen (ArcView file)
{
if (!file.View.AsciiEqual (0, "CHERRY PACK 2.0\0"))
return null;
bool is_compressed = file.View.ReadInt32 (0x10) != 0;
int count = file.View.ReadInt32 (0x14);
long base_offset = file.View.ReadUInt32 (0x18);
bool is_encrypted = false;
while (!IsSaneCount (count) || base_offset >= file.MaxOffset || (!is_compressed && base_offset != (0x1C + count*0x18)))
{
if (is_encrypted)
return null;
// these keys seem to be constant across different games
count ^= unchecked((int)0xBC138744);
base_offset ^= 0x64E0BA23;
is_encrypted = true;
}
List<Entry> dir;
if (is_compressed)
{
var packed = file.View.ReadBytes (0x1C, (uint)base_offset-0x1C);
Decrypt (packed, 0, packed.Length);
using (var mem = new MemoryStream (packed))
using (var lzss = new LzssStream (mem))
using (var index = new ArcView (lzss, file.Name, (uint)count * 0x18))
dir = ReadIndex (index, 0, count, base_offset, file);
}
else
{
dir = ReadIndex (file, 0x1C, count, base_offset, file);
}
if (null == dir)
return null;
if (is_encrypted && is_compressed)
return new CherryPak (file, this, dir);
else
return new ArcFile (file, this, dir);
}
void Decrypt (byte[] data, int index, int length) // Exile ~Blood Royal 2~
{
for (int i = 0; i+1 < length; i += 2)
{
byte lo = (byte)(data[index+i ] ^ 0x33);
byte hi = (byte)(data[index+i+1] ^ 0xCC);
data[index+i ] = hi;
data[index+i+1] = lo;
}
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
if (!(arc is CherryPak) || entry.Size < 0x18)
return base.OpenEntry (arc, entry);
var data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
if (data.Length >= 0x18)
{
uint encrypted_size;
unsafe
{
fixed (byte* raw = data)
{
uint* raw32 = (uint*)raw;
raw32[0] ^= 0xA53CC35Au;
raw32[1] ^= 0x35421005u;
raw32[4] ^= 0xCF42355Du;
encrypted_size = raw32[5];
}
}
Decrypt (data, 0x18, (int)(data.Length - 0x18));
}
return new MemoryStream (data);
}
}
}