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(ScrPlayer): implemented 'pac2' archives.

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This commit is contained in:
morkt 2018-01-18 07:20:27 +04:00
parent 6ecdbcb999
commit 8d629c3eb7
1 changed files with 59 additions and 21 deletions
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80
ArcFormats/ScrPlayer/ArcPAK.cs
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@ -23,6 +23,7 @@
// IN THE SOFTWARE.
//
using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
@ -37,34 +38,71 @@ namespace GameRes.Formats.ScrPlayer
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
public PakOpener ()
{
Signatures = new uint[] { 0x6B636170, 0x32636170 }; // 'pack', 'pac2'
}
public override ArcFile TryOpen (ArcView file)
{
uint index_size = file.View.ReadUInt32 (4);
if (index_size < 0x10 || index_size >= file.MaxOffset)
return null;
uint index_offset = 8;
uint index_end = index_offset + index_size;
var dir = new List<Entry>();
while (index_offset < index_end)
IBinaryStream index;
bool is_encrypted = file.View.ReadByte (3) == '2';
if (is_encrypted)
{
uint offset = file.View.ReadUInt32 (index_offset);
if (0 == offset)
break;
uint size = file.View.ReadUInt32 (index_offset+4);
byte name_length = file.View.ReadByte (index_offset+8);
var name = file.View.ReadString (index_offset+9, name_length);
index_offset += ((9u + name_length) & ~7u) + 8u;
if (index_offset > index_end)
return null;
var entry = FormatCatalog.Instance.Create<Entry> (name);
entry.Offset = offset;
entry.Size = size;
dir.Add (entry);
var index_bytes = new byte[(index_size + 3) & ~3u];
file.View.Read (8, index_bytes, 0, index_size);
DecryptIndex (index_bytes, (int)index_size);
index = new BinMemoryStream (index_bytes, 0, (int)index_size, file.Name);
}
else
index = file.CreateStream (8, index_size);
using (index)
{
uint index_pos = 0;
var dir = new List<Entry>();
while (index_pos < index_size)
{
index.Position = index_pos;
uint offset = index.ReadUInt32();
if (0 == offset)
break;
uint size = index.ReadUInt32();
byte name_length = index.ReadUInt8 ();
var name = index.ReadCString (name_length);
index_pos += ((5u + name_length) & ~3u) + 8u;
var entry = FormatCatalog.Instance.Create<Entry> (name);
entry.Offset = offset;
entry.Size = size;
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
}
if (0 == dir.Count)
return null;
return new ArcFile (file, this, dir);
}
if (0 == dir.Count)
return null;
return new ArcFile (file, this, dir);
}
unsafe void DecryptIndex (byte[] data, int length)
{
int aligned_count = ((length - 1) >> 2) + 1;
if (aligned_count * 4 > length)
throw new ArgumentException ("Can't decrypt non-aligned array.");
fixed (byte* data8 = data)
{
uint* data32 = (uint*)data8;
for (int i = 0; i < aligned_count; ++i)
*data32++ ^= EncryptionKey[i & 7];
}
}
static readonly uint[] EncryptionKey = {
0x305325A0, 0x306F308C, 0x672C5742, 0x5C0B5343,
0x8457306E, 0x72694F5C, 0x30423067, 0x0000308B,
};
}
}