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(ScrPlayer): detect index with different alignment.

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This commit is contained in:
morkt 2018-09-10 18:17:22 +04:00
parent 6840267354
commit 2906ab1e5b
1 changed files with 43 additions and 21 deletions
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64
ArcFormats/ScrPlayer/ArcPAK.cs
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@ -61,32 +61,54 @@ namespace GameRes.Formats.ScrPlayer
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)
int align = TestAlign (index, 8) ? 8 : 4;
var dir = ReadIndex (index, file.MaxOffset, align);
if (null == dir && 8 == align)
dir = ReadIndex (index, file.MaxOffset, 4);
if (null == dir || 0 == dir.Count)
return null;
return new ArcFile (file, this, dir);
}
}
bool TestAlign (IBinaryStream index, int align)
{
int first_offset = index.ReadInt32();
int size = index.ReadInt32();
int second_offset = (first_offset + size + 7) & -8;
int name_length = index.ReadUInt8();
index.Position = ((align + 1 + name_length) & -align) + 8;
return second_offset == index.ReadInt32();
}
List<Entry> ReadIndex (IBinaryStream index, long max_offset, int align)
{
var index_length = index.Length;
int index_pos = 0;
var dir = new List<Entry>();
while (index_pos < index_length)
{
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 += ((align + 1 + name_length) & -align) + 8;
// index_pos += ((9 + name_length) & ~7) + 8;
// index_pos += ((5 + name_length) & ~3) + 8;
var entry = FormatCatalog.Instance.Create<Entry> (name);
entry.Offset = offset;
entry.Size = size;
if (!entry.CheckPlacement (max_offset))
return null;
dir.Add (entry);
}
return dir;
}
unsafe void DecryptIndex (byte[] data, int length)
{
int aligned_count = ((length - 1) >> 2) + 1;