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(GsPack): handle encrypted archives.

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This commit is contained in:
morkt 2018-08-20 14:40:18 +04:00
parent b171ac9b4b
commit be76fa6028
1 changed files with 89 additions and 24 deletions
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113
ArcFormats/GsPack/ArcGsPack.cs
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@ -33,6 +33,14 @@ using GameRes.Utility;
namespace GameRes.Formats.Gs
{
internal class GsPackArchive : ArcFile
{
public GsPackArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir)
: base (arc, impl, dir)
{
}
}
[Export(typeof(ArchiveFormat))]
public class PakOpener : ArchiveFormat
{
@ -60,37 +68,94 @@ namespace GameRes.Formats.Gs
int count = file.View.ReadInt32 (0x3c);
if (!IsSaneCount (count) || index_size > 0xffffff)
return null;
uint crypt_key = file.View.ReadUInt32 (0x38);
uint is_encrypted = file.View.ReadUInt32 (0x38);
long data_offset = file.View.ReadUInt32 (0x40);
int index_offset = file.View.ReadInt32 (0x44);
int entry_size = version_major < 5 ? 0x48 : 0x68;
int unpacked_size = count * entry_size;
byte[] packed_index = file.View.ReadBytes (index_offset, index_size);
if (index_size != packed_index.Length)
return null;
if (0 != crypt_key)
for (int i = 0; i != packed_index.Length; ++i)
packed_index[i] ^= (byte)(i & crypt_key);
using (var stream = new MemoryStream (packed_index))
using (var reader = new LzssReader (stream, packed_index.Length, unpacked_size))
byte[] index;
if (index_size != 0)
{
reader.Unpack();
var index = reader.Data;
index_offset = 0;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
byte[] packed_index = file.View.ReadBytes (index_offset, index_size);
if (index_size != packed_index.Length)
return null;
if (0 != (is_encrypted & 1))
for (int i = 0; i != packed_index.Length; ++i)
packed_index[i] ^= (byte)i;
using (var stream = new MemoryStream (packed_index))
using (var reader = new LzssReader (stream, packed_index.Length, unpacked_size))
{
string name = Binary.GetCString (index, index_offset, 0x40);
if (0 != name.Length)
{
long offset = data_offset + LittleEndian.ToUInt32 (index, index_offset+0x40);
var entry = AutoEntry.Create (file, offset, name);
entry.Size = LittleEndian.ToUInt32 (index, index_offset+0x44);
dir.Add (entry);
}
index_offset += entry_size;
reader.Unpack();
index = reader.Data;
}
}
else
{
index = file.View.ReadBytes (index_offset, (uint)unpacked_size);
}
index_offset = 0;
string default_type = "";
var arc_name = Path.GetFileNameWithoutExtension (file.Name);
if (arc_name.StartsWith ("image", StringComparison.OrdinalIgnoreCase))
default_type = "image";
else if (arc_name.StartsWith ("voice", StringComparison.OrdinalIgnoreCase))
default_type = "audio";
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
string name = Binary.GetCString (index, index_offset, 0x40);
if (0 != name.Length)
{
var entry = new Entry {
Name = name,
Type = default_type,
Offset = data_offset + LittleEndian.ToUInt32 (index, index_offset+0x40),
Size = LittleEndian.ToUInt32 (index, index_offset+0x44),
};
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
}
index_offset += entry_size;
}
if (0 != (is_encrypted & 2))
return new GsPackArchive (file, this, dir);
if (string.IsNullOrEmpty (default_type))
{
foreach (var entry in dir)
{
uint signature = file.View.ReadUInt32 (entry.Offset);
var res = AutoEntry.DetectFileType (signature);
entry.ChangeType (res);
}
}
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var garc = arc as GsPackArchive;
if (null == garc)
return base.OpenEntry (arc, entry);
var data = garc.File.View.ReadBytes (entry.Offset, entry.Size);
DecryptData (data, entry.Name);
return new BinMemoryStream (data, entry.Name);
}
void DecryptData (byte[] data, string key)
{
int numkey = 0;
for (int i = 0; i < key.Length; ++i)
numkey = numkey * 37 + (key[i] | 0x20);
unsafe
{
fixed (byte* data8 = data)
{
int* data32 = (int*)data8;
for (int count = data.Length / 4; count > 0; --count)
*data32++ ^= numkey;
}
return new ArcFile (file, this, dir);
}
}
}