public static ConstantData FromFileSystemEntry(FileSystemEntry entry)
{
using (var stream = entry.Open())
using (var reader = new BinaryReader(stream))
{
var data = new ConstantData();
//validate that this is a correct const
var magic = reader.ReadFixedLengthString(17);
if (magic != "Apt constant file")
{
throw new InvalidDataException($"Not a supported const file: {magic}");
}
reader.BaseStream.Seek(3, SeekOrigin.Current);
data.AptDataEntryOffset = reader.ReadUInt32();
var numEntries = reader.ReadUInt32();
var headerSize = reader.ReadUInt32();
if (headerSize != 32)
{
throw new InvalidDataException("Constant header must be 32 bytes");
}
for (var i = 0; i < numEntries; i++)
{
var constEntry = new ConstantEntry
{
Type = reader.ReadUInt32AsEnum <ConstantEntryType>()
};
//read the number/ string offset
switch (constEntry.Type)
{
case ConstantEntryType.Undef:
throw new InvalidDataException("Undefined const entry");
case ConstantEntryType.String:
var strOffset = reader.ReadUInt32();
var pos = reader.BaseStream.Position;
reader.BaseStream.Seek(strOffset, SeekOrigin.Begin);
constEntry.Value = reader.ReadNullTerminatedString();
reader.BaseStream.Seek(pos, SeekOrigin.Begin);
break;
case ConstantEntryType.Register:
constEntry.Value = reader.ReadUInt32();
break;
case ConstantEntryType.Boolean:
constEntry.Value = reader.ReadBooleanUInt32Checked();
break;
case ConstantEntryType.Float:
constEntry.Value = reader.ReadSingle();
break;
case ConstantEntryType.Integer:
constEntry.Value = reader.ReadInt32();
break;
case ConstantEntryType.Lookup:
constEntry.Value = reader.ReadUInt32();
break;
default:
throw new InvalidDataException();
}
data.Entries.Add(constEntry);
}
return(data);
}
}
public static ConstantData FromFileSystemEntry(FileSystemEntry entry)
{
using (var stream = entry.Open())
using (var reader = new BinaryReader(stream))
{
var data = new ConstantData();
//validate that this is a correct const
var magic = reader.ReadFixedLengthString(17);
if (magic != "Apt constant file")
{
throw new InvalidDataException($"Not a supported const file: {magic}");
}
reader.BaseStream.Seek(3, SeekOrigin.Current);
data.AptDataEntryOffset = reader.ReadUInt32();
var numEntries = reader.ReadUInt32();
reader.BaseStream.Seek(4, SeekOrigin.Current);
for (var i = 0; i < numEntries; i++)
{
var constEntry = new ConstantEntry
{
Type = reader.ReadUInt32AsEnum <ConstantEntryType>()
};
//read the number/ string offset
var entryValue = reader.ReadUInt32();
switch (constEntry.Type)
{
case ConstantEntryType.Undef:
throw new InvalidDataException("Undefined const entry");
case ConstantEntryType.String:
var pos = reader.BaseStream.Position;
reader.BaseStream.Seek(entryValue, SeekOrigin.Begin);
constEntry.Value = reader.ReadNullTerminatedString();
reader.BaseStream.Seek(pos, SeekOrigin.Begin);
break;
case ConstantEntryType.Number:
constEntry.Value = entryValue;
break;
case ConstantEntryType.Unknown1:
// TODO
break;
case ConstantEntryType.Unknown2:
// TODO
break;
case ConstantEntryType.Unknown3:
// TODO
break;
case ConstantEntryType.Unknown4:
// TODO
break;
case ConstantEntryType.Unknown5:
// TODO
break;
default:
throw new InvalidDataException();
}
data.Entries.Add(constEntry);
}
return(data);
}
}
