public override Stream OpenEntry(ArcFile arc, Entry entry)
{
if (0 == entry.Size)
{
return(Stream.Null);
}
var input = arc.File.CreateStream(entry.Offset, entry.Size);
var pentry = entry as PackedEntry;
if (null == pentry || !pentry.IsPacked)
{
return(input);
}
if (!arc.File.View.AsciiEqual(entry.Offset, "GCE"))
{
Trace.WriteLine("Packed entry is not GCE", entry.Name);
return(input);
}
using (input)
using (var reader = new GceReader(input, (int)pentry.UnpackedSize))
{
return(new MemoryStream(reader.Data));
}
}
public override ArcFile TryOpen(ArcView file)
{
if (0 != file.View.ReadInt32(4))
{
return(null);
}
long index_offset = file.View.ReadInt64(8);
if (index_offset >= file.MaxOffset)
{
return(null);
}
if (!file.View.AsciiEqual(index_offset, "GCE3"))
{
return(null);
}
int count = file.View.ReadInt32(index_offset + 0x18);
if (!IsSaneCount(count))
{
return(null);
}
bool index_packed = 0x11 == file.View.ReadInt32(index_offset + 4);
uint index_size = file.View.ReadUInt32(index_offset + 8);
byte[] index = null;
if (index_packed)
{
index_size -= 0x28;
int unpacked_size = file.View.ReadInt32(index_offset + 0x20);
using (var input = file.CreateStream(index_offset + 0x28, index_size))
using (var reader = new GceReader(input, unpacked_size))
index = reader.Data;
}
else
{
index_size -= 0x20;
index = new byte[index_size];
if (index.Length != file.View.Read(index_offset + 0x20, index, 0, index_size))
{
return(null);
}
}
int current_index = 0;
int current_filename = 0x20 * count;
long current_offset = 0x10;
var dir = new List <Entry> (count);
for (int i = 0; i < count; ++i)
{
int name_length = LittleEndian.ToUInt16(index, current_filename);
if (current_filename + 2 + name_length > index.Length)
{
return(null);
}
uint size = LittleEndian.ToUInt32(index, current_index + 0x18);
if (size != 0)
{
string name = Encodings.cp932.GetString(index, current_filename + 2, name_length);
var entry = new PackedEntry
{
Name = name,
Type = FormatCatalog.Instance.GetTypeFromName(name),
Offset = current_offset,
Size = size,
UnpackedSize = LittleEndian.ToUInt32(index, current_index + 0x10),
};
if (!entry.CheckPlacement(file.MaxOffset))
{
return(null);
}
entry.IsPacked = entry.Size != entry.UnpackedSize;
current_offset += entry.Size;
dir.Add(entry);
}
current_index += 0x20;
current_filename += 2 + name_length;
}
return(new ArcFile(file, this, dir));
}
