public KoiStream(string name, IReadableSegment contents, ILogger logger)
: base(name, contents)
{
var reader = contents.CreateReader();
logger.Debug(Tag, "Reading koi stream header...");
uint magic = reader.ReadUInt32();
if (magic != Signature)
{
logger.Warning(Tag, $"Koi stream data does not start with a valid signature (Expected 0x{Signature:X4} but read 0x{magic:X4}).");
}
uint mdCount = reader.ReadUInt32();
uint strCount = reader.ReadUInt32();
uint expCount = reader.ReadUInt32();
logger.Debug(Tag, $"Reading {mdCount} references...");
for (int i = 0; i < mdCount; i++)
{
uint id = Utils.ReadCompressedUInt(ref reader);
uint token = Utils.FromCodedToken(Utils.ReadCompressedUInt(ref reader));
References.Add(id, new MetadataToken(token));
}
logger.Debug(Tag, $"Reading {strCount} strings...");
for (int i = 0; i < strCount; i++)
{
uint id = Utils.ReadCompressedUInt(ref reader);
int length = (int)Utils.ReadCompressedUInt(ref reader);
byte[] buffer = new byte[length * 2];
reader.ReadBytes(buffer, 0, buffer.Length);
Strings.Add(id, Encoding.Unicode.GetString(buffer));
}
logger.Debug(Tag, $"Reading {expCount} exports...");
for (int i = 0; i < expCount; i++)
{
uint id = Utils.ReadCompressedUInt(ref reader);
var exportInfo = VMExportInfo.FromReader(ref reader);
// Exports in KoiVM either point to entrypoints of virtualised methods, or just act as a descriptor
// for methods that are intra linked through instructions like ldftn.
if (exportInfo.IsSignatureOnly)
{
logger.Debug(Tag, $"Export {id} maps to a method signature of an intra-linked method.");
}
else
{
logger.Debug(Tag, $"Export {id} maps to function_{exportInfo.EntrypointAddress:X4}.");
}
Exports.Add(id, exportInfo);
}
}
public static KoiStream FromReadingContext(ReadingContext context, ILogger logger)
{
var reader = context.Reader;
var result = new KoiStream {
StartOffset = reader.Position
};
logger.Debug(Tag, "Reading koi stream header...");
uint magic = reader.ReadUInt32();
if (magic != Signature)
{
logger.Warning(Tag, $"Koi stream data does not start with a valid signature (Expected 0x{Signature:X4} but read 0x{magic:X4}).");
}
uint mdCount = reader.ReadUInt32();
uint strCount = reader.ReadUInt32();
uint expCount = reader.ReadUInt32();
logger.Debug(Tag, $"Reading {mdCount} references...");
for (int i = 0; i < mdCount; i++)
{
uint id = Utils.ReadCompressedUInt(reader);
uint token = Utils.FromCodedToken(Utils.ReadCompressedUInt(reader));
result.References.Add(id, new MetadataToken(token));
}
logger.Debug(Tag, $"Reading {strCount} strings...");
for (int i = 0; i < strCount; i++)
{
uint id = Utils.ReadCompressedUInt(reader);
int length = (int)Utils.ReadCompressedUInt(reader);
result.Strings.Add(id, Encoding.Unicode.GetString(reader.ReadBytes(length * 2)));
}
logger.Debug(Tag, $"Reading {expCount} exports...");
for (int i = 0; i < expCount; i++)
{
uint id = Utils.ReadCompressedUInt(reader);
var exportInfo = VMExportInfo.FromReader(reader);
// Exports in KoiVM either point to entrypoints of virtualised methods, or just act as a descriptor
// for methods that are intra linked through instructions like ldftn.
if (exportInfo.IsSignatureOnly)
{
logger.Debug(Tag, $"Export {id} maps to a method signature of an intra-linked method.");
}
else
{
logger.Debug(Tag, $"Export {id} maps to function_{exportInfo.EntrypointAddress:X4}.");
}
result.Exports.Add(id, exportInfo);
}
reader.Position = reader.StartPosition;
result.Data = reader.ReadBytes((int)reader.Length);
return(result);
}
