public override ArcFile TryOpen(ArcView file)
{
int version = '2' == file.View.ReadByte(3) ? 2 : 1;
long base_offset = 0;
List <Entry> dir = null;
byte[] names = null;
using (var stream = file.CreateStream())
{
Func <IBinaryStream, long> read_long;
if (2 == version)
{
read_long = s => s.ReadInt64();
}
else
{
read_long = s => s.ReadUInt32();
}
stream.Position = 4;
if (file.MaxOffset != read_long(stream))
{
return(null);
}
for (;;)
{
long section_start = stream.Position;
var id_bytes = stream.ReadBytes(4);
if (0 == id_bytes.Length)
{
break;
}
var id = new AsciiString(id_bytes);
var section_size = read_long(stream);
var header_size = read_long(stream);
if (section_size < 4 || header_size > section_size)
{
return(null);
}
var content_pos = section_start + header_size;
if ("cLST" == id)
{
stream.ReadUInt32();
int count = stream.ReadInt32();
if (!IsSaneCount(count))
{
return(null);
}
uint key = stream.ReadUInt32();
stream.Position = content_pos;
var clst = stream.ReadBytes((int)(section_size - header_size));
Decrypt(clst, key);
dir = new List <Entry> (count);
using (var index = new BinMemoryStream(clst))
{
for (int i = 0; i < count; ++i)
{
var entry = new PkEntry {
NameOffset = (int)read_long(index),
Offset = (long)read_long(index),
Size = (uint)read_long(index),
};
dir.Add(entry);
}
}
}
else if ("cNAM" == id)
{
if (null == dir)
{
return(null);
}
stream.ReadUInt32();
uint key = stream.ReadUInt32();
stream.Position = content_pos;
names = stream.ReadBytes((int)(section_size - header_size));
Decrypt(names, key);
}
else if ("cDAT" == id)
{
base_offset = content_pos;
}
stream.Position = section_start + section_size;
}
}
if (null == dir || null == names || 0 == base_offset)
{
return(null);
}
foreach (PkEntry entry in dir)
{
entry.Offset += base_offset;
if (!entry.CheckPlacement(file.MaxOffset))
{
return(null);
}
var name = Binary.GetCString(names, entry.NameOffset);
entry.Name = name;
if (name.HasExtension(".px"))
{
entry.Type = "audio";
}
else
{
entry.Type = FormatCatalog.Instance.GetTypeFromName(name);
}
}
return(new ArcFile(file, this, dir));
}
public override ArcFile TryOpen(ArcView file)
{
if (file.MaxOffset != file.View.ReadUInt32(4))
{
return(null);
}
long base_offset = 0;
List <Entry> dir = null;
bool got_names = false;
long offset = 8;
while (offset < file.MaxOffset)
{
var id = new AsciiString(file.View.ReadBytes(offset, 4));
uint section_size = file.View.ReadUInt32(offset + 4);
if (0 == section_size)
{
return(null);
}
uint header_size = file.View.ReadUInt32(offset + 8);
if ("cLST" == id)
{
int count = file.View.ReadInt32(offset + 0x10);
if (!IsSaneCount(count))
{
return(null);
}
uint key = file.View.ReadUInt32(offset + 0x14);
var clst = file.View.ReadBytes(offset + header_size, section_size - header_size);
Decrypt(clst, key);
dir = new List <Entry> (count);
int index_offset = 0;
for (int i = 0; i < count; ++i)
{
var entry = new PkEntry {
NameOffset = LittleEndian.ToInt32(clst, index_offset),
Offset = LittleEndian.ToUInt32(clst, index_offset + 4),
Size = LittleEndian.ToUInt32(clst, index_offset + 8),
};
dir.Add(entry);
index_offset += 12;
}
}
else if ("cNAM" == id)
{
if (null == dir)
{
return(null);
}
uint key = file.View.ReadUInt32(offset + 0x10);
var cnam = file.View.ReadBytes(offset + header_size, section_size - header_size);
Decrypt(cnam, key);
foreach (PkEntry entry in dir)
{
var name = Binary.GetCString(cnam, entry.NameOffset);
entry.Name = name;
if (name.HasExtension(".px"))
{
entry.Type = "audio";
}
else
{
entry.Type = FormatCatalog.Instance.GetTypeFromName(name);
}
}
got_names = true;
}
else if ("cDAT" == id)
{
base_offset = offset + header_size;
}
offset += section_size;
}
if (null == dir || !got_names || 0 == base_offset)
{
return(null);
}
foreach (var entry in dir)
{
entry.Offset += base_offset;
if (!entry.CheckPlacement(file.MaxOffset))
{
return(null);
}
}
return(new ArcFile(file, this, dir));
}
