/// <summary>
/// Given the metadata for an event and an event payload, decode and deserialize the event payload.
/// </summary>
internal static object[] DecodePayload(ref EventSource.EventMetadata metadata, ReadOnlySpan <Byte> payload)
{
ParameterInfo[] parameters = metadata.Parameters;
object[] decodedFields = new object[parameters.Length];
for (int i = 0; i < parameters.Length; i++)
{
// It is possible that an older version of the event was emitted.
// If this happens, the payload might be missing arguments at the end.
// We can just leave these unset.
if (payload.Length <= 0)
{
break;
}
Type parameterType = parameters[i].ParameterType;
if (parameterType == typeof(IntPtr))
{
if (IntPtr.Size == 8)
{
// Payload is automatically updated to point to the next piece of data.
decodedFields[i] = (IntPtr)ReadUnalignedUInt64(ref payload);
}
else if (IntPtr.Size == 4)
{
decodedFields[i] = (IntPtr)MemoryMarshal.Read <Int32>(payload);
payload = payload.Slice(IntPtr.Size);
}
else
{
Debug.Assert(false, "Unsupported pointer size.");
}
}
else if (parameterType == typeof(int))
{
decodedFields[i] = MemoryMarshal.Read <int>(payload);
payload = payload.Slice(sizeof(int));
}
else if (parameterType == typeof(uint))
{
decodedFields[i] = MemoryMarshal.Read <uint>(payload);
payload = payload.Slice(sizeof(uint));
}
else if (parameterType == typeof(long))
{
// Payload is automatically updated to point to the next piece of data.
decodedFields[i] = (long)ReadUnalignedUInt64(ref payload);
}
else if (parameterType == typeof(ulong))
{
// Payload is automatically updated to point to the next piece of data.
decodedFields[i] = ReadUnalignedUInt64(ref payload);
}
else if (parameterType == typeof(byte))
{
decodedFields[i] = MemoryMarshal.Read <byte>(payload);
payload = payload.Slice(sizeof(byte));
}
else if (parameterType == typeof(sbyte))
{
decodedFields[i] = MemoryMarshal.Read <sbyte>(payload);
payload = payload.Slice(sizeof(sbyte));
}
else if (parameterType == typeof(short))
{
decodedFields[i] = MemoryMarshal.Read <short>(payload);
payload = payload.Slice(sizeof(short));
}
else if (parameterType == typeof(ushort))
{
decodedFields[i] = MemoryMarshal.Read <ushort>(payload);
payload = payload.Slice(sizeof(ushort));
}
else if (parameterType == typeof(float))
{
decodedFields[i] = MemoryMarshal.Read <float>(payload);
payload = payload.Slice(sizeof(float));
}
else if (parameterType == typeof(double))
{
// Payload is automatically updated to point to the next piece of data.
Int64 doubleBytes = (Int64)ReadUnalignedUInt64(ref payload);
decodedFields[i] = BitConverter.Int64BitsToDouble(doubleBytes);
}
else if (parameterType == typeof(bool))
{
// The manifest defines a bool as a 32bit type (WIN32 BOOL), not 1 bit as CLR Does.
decodedFields[i] = (MemoryMarshal.Read <int>(payload) == 1);
payload = payload.Slice(sizeof(int));
}
else if (parameterType == typeof(Guid))
{
// Payload is automatically updated to point to the next piece of data.
decodedFields[i] = ReadUnalignedGuid(ref payload);
}
else if (parameterType == typeof(char))
{
decodedFields[i] = MemoryMarshal.Read <char>(payload);
payload = payload.Slice(sizeof(char));
}
else if (parameterType == typeof(string))
{
ReadOnlySpan <char> charPayload = MemoryMarshal.Cast <byte, char>(payload);
int charCount = 0;
foreach (char c in charPayload)
{
if (c == '\0')
{
break;
}
charCount++;
}
string val = new string(charPayload.ToArray(), 0, charCount);
payload = payload.Slice((val.Length + 1) * sizeof(char));
decodedFields[i] = val;
}
else
{
Debug.Assert(false, "Unsupported type encountered.");
}
}
return(decodedFields);
}
/// <summary>
/// Given the metadata for an event and an event payload, decode and deserialize the event payload.
/// </summary>
internal static object[] DecodePayload(ref EventSource.EventMetadata metadata, ReadOnlySpan <byte> payload)
{
ParameterInfo[] parameters = metadata.Parameters;
object[] decodedFields = new object[parameters.Length];
for (int i = 0; i < parameters.Length; i++)
{
// It is possible that an older version of the event was emitted.
// If this happens, the payload might be missing arguments at the end.
// We can just leave these unset.
if (payload.Length <= 0)
{
break;
}
Type parameterType = parameters[i].ParameterType;
if (parameterType == typeof(IntPtr))
{
if (IntPtr.Size == 8)
{
decodedFields[i] = (IntPtr)BinaryPrimitives.ReadInt64LittleEndian(payload);
}
else
{
decodedFields[i] = (IntPtr)BinaryPrimitives.ReadInt32LittleEndian(payload);
}
payload = payload.Slice(IntPtr.Size);
}
else if (parameterType == typeof(int))
{
decodedFields[i] = BinaryPrimitives.ReadInt32LittleEndian(payload);
payload = payload.Slice(sizeof(int));
}
else if (parameterType == typeof(uint))
{
decodedFields[i] = BinaryPrimitives.ReadUInt32LittleEndian(payload);
payload = payload.Slice(sizeof(uint));
}
else if (parameterType == typeof(long))
{
decodedFields[i] = BinaryPrimitives.ReadInt64LittleEndian(payload);
payload = payload.Slice(sizeof(long));
}
else if (parameterType == typeof(ulong))
{
decodedFields[i] = BinaryPrimitives.ReadUInt64LittleEndian(payload);
payload = payload.Slice(sizeof(ulong));
}
else if (parameterType == typeof(byte))
{
decodedFields[i] = MemoryMarshal.Read <byte>(payload);
payload = payload.Slice(sizeof(byte));
}
else if (parameterType == typeof(sbyte))
{
decodedFields[i] = MemoryMarshal.Read <sbyte>(payload);
payload = payload.Slice(sizeof(sbyte));
}
else if (parameterType == typeof(short))
{
decodedFields[i] = BinaryPrimitives.ReadInt16LittleEndian(payload);
payload = payload.Slice(sizeof(short));
}
else if (parameterType == typeof(ushort))
{
decodedFields[i] = BinaryPrimitives.ReadUInt16LittleEndian(payload);
payload = payload.Slice(sizeof(ushort));
}
else if (parameterType == typeof(float))
{
decodedFields[i] = BitConverter.Int32BitsToSingle(BinaryPrimitives.ReadInt32LittleEndian(payload));
payload = payload.Slice(sizeof(float));
}
else if (parameterType == typeof(double))
{
decodedFields[i] = BitConverter.Int64BitsToDouble(BinaryPrimitives.ReadInt64LittleEndian(payload));
payload = payload.Slice(sizeof(double));
}
else if (parameterType == typeof(bool))
{
// The manifest defines a bool as a 32bit type (WIN32 BOOL), not 1 bit as CLR Does.
decodedFields[i] = (BinaryPrimitives.ReadInt32LittleEndian(payload) == 1);
payload = payload.Slice(sizeof(int));
}
else if (parameterType == typeof(Guid))
{
const int sizeOfGuid = 16;
decodedFields[i] = new Guid(payload.Slice(0, sizeOfGuid));
payload = payload.Slice(sizeOfGuid);
}
else if (parameterType == typeof(char))
{
decodedFields[i] = (char)BinaryPrimitives.ReadUInt16LittleEndian(payload);
payload = payload.Slice(sizeof(char));
}
else if (parameterType == typeof(string))
{
// Try to find null terminator (0x00) from the byte span
// NOTE: we do this by hand instead of using IndexOf because payload may be unaligned due to
// mixture of different types being stored in the same buffer. (see eventpipe.cpp:CopyData)
int byteCount = -1;
for (int j = 1; j < payload.Length; j += 2)
{
if (payload[j - 1] == (byte)(0) && payload[j] == (byte)(0))
{
byteCount = j + 1;
break;
}
}
ReadOnlySpan <char> charPayload;
if (byteCount < 0)
{
charPayload = MemoryMarshal.Cast <byte, char>(payload);
payload = default;
}
else
{
charPayload = MemoryMarshal.Cast <byte, char>(payload.Slice(0, byteCount - 2));
payload = payload.Slice(byteCount);
}
decodedFields[i] = BitConverter.IsLittleEndian ? new string(charPayload) : Encoding.Unicode.GetString(MemoryMarshal.Cast <char, byte>(charPayload));
}
else
{
Debug.Fail("Unsupported type encountered.");
}
}
return(decodedFields);
}
/// <summary>
/// Given the metadata for an event and an event payload, decode and deserialize the event payload.
/// </summary>
internal static object[] DecodePayload(ref EventSource.EventMetadata metadata, ReadOnlySpan <byte> payload)
{
ParameterInfo[] parameters = metadata.Parameters;
object[] decodedFields = new object[parameters.Length];
for (int i = 0; i < parameters.Length; i++)
{
// It is possible that an older version of the event was emitted.
// If this happens, the payload might be missing arguments at the end.
// We can just leave these unset.
if (payload.Length <= 0)
{
break;
}
Type parameterType = parameters[i].ParameterType;
if (parameterType == typeof(IntPtr))
{
if (IntPtr.Size == 8)
{
decodedFields[i] = (IntPtr)BinaryPrimitives.ReadInt64LittleEndian(payload);
}
else
{
decodedFields[i] = (IntPtr)BinaryPrimitives.ReadInt32LittleEndian(payload);
}
payload = payload.Slice(IntPtr.Size);
}
else if (parameterType == typeof(int))
{
decodedFields[i] = BinaryPrimitives.ReadInt32LittleEndian(payload);
payload = payload.Slice(sizeof(int));
}
else if (parameterType == typeof(uint))
{
decodedFields[i] = BinaryPrimitives.ReadUInt32LittleEndian(payload);
payload = payload.Slice(sizeof(uint));
}
else if (parameterType == typeof(long))
{
decodedFields[i] = BinaryPrimitives.ReadInt64LittleEndian(payload);
payload = payload.Slice(sizeof(long));
}
else if (parameterType == typeof(ulong))
{
decodedFields[i] = BinaryPrimitives.ReadUInt64LittleEndian(payload);
payload = payload.Slice(sizeof(ulong));
}
else if (parameterType == typeof(byte))
{
decodedFields[i] = MemoryMarshal.Read <byte>(payload);
payload = payload.Slice(sizeof(byte));
}
else if (parameterType == typeof(sbyte))
{
decodedFields[i] = MemoryMarshal.Read <sbyte>(payload);
payload = payload.Slice(sizeof(sbyte));
}
else if (parameterType == typeof(short))
{
decodedFields[i] = BinaryPrimitives.ReadInt16LittleEndian(payload);
payload = payload.Slice(sizeof(short));
}
else if (parameterType == typeof(ushort))
{
decodedFields[i] = BinaryPrimitives.ReadUInt16LittleEndian(payload);
payload = payload.Slice(sizeof(ushort));
}
else if (parameterType == typeof(float))
{
decodedFields[i] = BitConverter.Int32BitsToSingle(BinaryPrimitives.ReadInt32LittleEndian(payload));
payload = payload.Slice(sizeof(float));
}
else if (parameterType == typeof(double))
{
decodedFields[i] = BitConverter.Int64BitsToDouble(BinaryPrimitives.ReadInt64LittleEndian(payload));
payload = payload.Slice(sizeof(double));
}
else if (parameterType == typeof(bool))
{
// The manifest defines a bool as a 32bit type (WIN32 BOOL), not 1 bit as CLR Does.
decodedFields[i] = (BinaryPrimitives.ReadInt32LittleEndian(payload) == 1);
payload = payload.Slice(sizeof(int));
}
else if (parameterType == typeof(Guid))
{
const int sizeOfGuid = 16;
decodedFields[i] = new Guid(payload.Slice(0, sizeOfGuid));
payload = payload.Slice(sizeOfGuid);
}
else if (parameterType == typeof(char))
{
decodedFields[i] = (char)BinaryPrimitives.ReadUInt16LittleEndian(payload);
payload = payload.Slice(sizeof(char));
}
else if (parameterType == typeof(string))
{
ReadOnlySpan <char> charPayload = MemoryMarshal.Cast <byte, char>(payload);
int charCount = charPayload.IndexOf('\0');
if (charCount < 0)
{
payload = default;
}
else
{
charPayload = charPayload.Slice(0, charCount);
payload = payload.Slice((charCount + 1) * sizeof(char));
}
decodedFields[i] = BitConverter.IsLittleEndian ? new string(charPayload) : Encoding.Unicode.GetString(MemoryMarshal.Cast <char, byte>(charPayload));
}
else
{
Debug.Assert(false, "Unsupported type encountered.");
}
}
return(decodedFields);
}
