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(ISA): archive index variation.

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This commit is contained in:
morkt 2018-05-01 16:37:14 +04:00
parent 9eaa5d8e2b
commit cd7716b7fd
1 changed files with 28 additions and 11 deletions
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39
ArcFormats/ArcISA.cs
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@ -23,11 +23,8 @@
// IN THE SOFTWARE.
//
using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using GameRes.Utility;
namespace GameRes.Formats.ISM
{
@ -44,24 +41,44 @@ namespace GameRes.Formats.ISM
{
if (!file.View.AsciiEqual (4, "ARCHIVED"))
return null;
int count = file.View.ReadInt16 (0x0c);
if (count <= 0)
int count = file.View.ReadInt16 (0x0C);
if (!IsSaneCount (count))
return null;
file.View.Reserve (0x10, (uint)count*0x20u);
int index_offset = 0x10;
int version = file.View.ReadUInt16 (0x0E);
bool is_encrypted = (version & 0x8000) != 0;
version &= 0x7FFF;
uint index_offset = 0x10;
uint name_length = 1 == version ? 0x30u : 0x0Cu;
uint record_length = 1 == version ? 0x10u : 0x14u;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
var name = file.View.ReadString (index_offset, 0x0c);
var name = file.View.ReadString (index_offset, name_length);
var entry = FormatCatalog.Instance.Create<Entry> (name);
entry.Offset = file.View.ReadUInt32 (index_offset+0x10);
entry.Size = file.View.ReadUInt32 (index_offset+0x14);
index_offset += name_length;
entry.Offset = file.View.ReadUInt32 (index_offset+4);
entry.Size = file.View.ReadUInt32 (index_offset+8);
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
index_offset += 0x20;
index_offset += record_length;
}
return new ArcFile (file, this, dir);
}
unsafe void DecryptIndex (byte[] data)
{
int length = data.Length / 4;
if (0 == length)
return;
fixed (byte* data8 = data)
{
int* data32 = (int*)data8;
for (int i = 0; i < length; ++i)
{
data32[i] ^= ~(data.Length + length - i);
}
}
}
}
}