internal static (Array, int) DecodeSequence(Type elementType, int length, IEnumerable <AbiType> types, byte[] data, bool packed, int startPosition)
{
Array sequence = Array.CreateInstance(elementType, length);
int position = startPosition;
int dynamicPosition = 0;
using IEnumerator <AbiType> typesEnumerator = types.GetEnumerator();
object?item;
for (int i = 0; i < length; i++)
{
typesEnumerator.MoveNext();
AbiType type = typesEnumerator.Current;
if (type.IsDynamic)
{
(UInt256 offset, int nextPosition) = UInt256.DecodeUInt(data, position, packed);
(item, dynamicPosition) = type.Decode(data, startPosition + (int)offset, packed);
position = nextPosition;
}
else
{
(item, position) = type.Decode(data, position, packed);
}
sequence.SetValue(item, i);
}
return(sequence, Math.Max(position, dynamicPosition));
}
public override bool Equals(object obj)
{
AbiType type = obj as AbiType;
return(type != null &&
Name == type.Name);
}
protected static AbiType GetForCSharpType(Type type)
{
if (_typeMappings.TryGetValue(type, out AbiType? abiTYpe))
{
return(abiTYpe);
}
else if (type.IsArray)
{
if (type == typeof(byte[]))
{
return(DynamicBytes);
}
Type elementType = type.GetElementType() !;
return(new AbiArray(GetForCSharpType(elementType)));
}
else if (type.IsValueTuple())
{
Type[] subTypes = type.GetGenericArguments();
AbiType[] elements = new AbiType[subTypes.Length];
for (int i = 0; i < subTypes.Length; i++)
{
elements[i] = GetForCSharpType(subTypes[i]);
}
return(new AbiTuple(elements));
}
else
{
throw new NotSupportedException($"Type {type} doesn't have mapped {nameof(AbiType)}");
}
}
static AbiType()
{
AbiType type = AbiAddress.Instance;
type = AbiBool.Instance;
type = AbiDynamicBytes.Instance;
type = AbiInt.Int8;
type = AbiString.Instance;
type = AbiUInt.UInt8;
}
public AbiFixedLengthArray(AbiType elementType, int length)
{
if (length <= 0)
{
throw new ArgumentException($"Length of {nameof(AbiFixedLengthArray)} has to be greater than 0", nameof(length));
}
_elementType = elementType;
Length = length;
CSharpType = _elementType.CSharpType.MakeArrayType();
}
public byte[] Encode(AbiEncodingStyle encodingStyle, AbiSignature signature, params object[] arguments)
{
bool packed = (encodingStyle & AbiEncodingStyle.Packed) == AbiEncodingStyle.Packed;
if (arguments.Length != signature.Types.Length)
{
throw new AbiException(
$"Insufficient parameters for {signature.Name}. Expected {signature.Types.Length} arguments but got {arguments.Length}");
}
List <byte[]> dynamicParts = new();
List <byte[]> headerParts = new();
BigInteger currentOffset = arguments.Length * AbiType.UInt256.LengthInBytes;
for (int i = 0; i < arguments.Length; i++)
{
AbiType type = signature.Types[i];
if (type.IsDynamic)
{
headerParts.Add(AbiType.UInt256.Encode(currentOffset, packed));
byte[] encoded = type.Encode(arguments[i], packed);
currentOffset += encoded.Length;
dynamicParts.Add(encoded);
}
else
{
headerParts.Add(type.Encode(arguments[i], packed));
}
}
bool includeSig = encodingStyle == AbiEncodingStyle.IncludeSignature;
int sigOffset = includeSig ? 1 : 0;
byte[][] encodedParts = new byte[sigOffset + headerParts.Count + dynamicParts.Count][];
if (includeSig)
{
encodedParts[0] = signature.Address;
}
for (int i = 0; i < headerParts.Count; i++)
{
encodedParts[sigOffset + i] = headerParts[i];
}
for (int i = 0; i < dynamicParts.Count; i++)
{
encodedParts[sigOffset + headerParts.Count + i] = dynamicParts[i];
}
return(Bytes.Concat(encodedParts));
}
public AbiFixedLengthArray(AbiType elementType, int length)
{
if (length <= 0)
{
throw new ArgumentException($"Length of {nameof(AbiFixedLengthArray)} has to be greater than 0", nameof(length));
}
ElementType = elementType;
Length = length;
Name = $"{ElementType}[{Length}]";
CSharpType = ElementType.CSharpType.MakeArrayType();
IsDynamic = Length != 0 && ElementType.IsDynamic;
}
public object[] Decode(AbiEncodingStyle encodingStyle, AbiSignature signature, byte[] data)
{
bool packed = (encodingStyle & AbiEncodingStyle.Packed) == AbiEncodingStyle.Packed;
bool includeSig = encodingStyle == AbiEncodingStyle.IncludeSignature;
int sigOffset = includeSig ? 4 : 0;
string[] argTypeNames = new string[signature.Types.Length];
for (int i = 0; i < signature.Types.Length; i++)
{
argTypeNames[i] = signature.Types[i].ToString();
}
int position = 0;
if (encodingStyle == AbiEncodingStyle.IncludeSignature)
{
if (!Bytes.AreEqual(data.Slice(0, 4), ComputeAddress(signature)))
{
throw new AbiException(
$"Signature in encoded ABI data is not consistent with {ComputeSignature(signature.Name, signature.Types)}");
}
position = 4;
}
object[] arguments = new object[signature.Types.Length];
int dynamicPosition = 0;
for (int i = 0; i < signature.Types.Length; i++)
{
AbiType type = signature.Types[i];
if (type.IsDynamic)
{
// TODO: do not have to decode this - can just jump 32 and check if first call and use dynamic position
(BigInteger offset, int nextPosition) = AbiType.UInt256.DecodeUInt(data, position, packed);
(arguments[i], dynamicPosition) = type.Decode(data, sigOffset + (int)offset, packed);
position = nextPosition;
}
else
{
(arguments[i], position) = type.Decode(data, position, packed);
}
}
if (Math.Max(position, dynamicPosition) != data.Length)
{
throw new AbiException($"Unexpected data at position {position}");
}
return(arguments);
}
public byte[] Encode(AbiEncodingStyle encodingStyle, AbiSignature signature, params object[] arguments)
{
bool packed = (encodingStyle & AbiEncodingStyle.Packed) == AbiEncodingStyle.Packed;
List <byte[]> dynamicParts = new List <byte[]>();
List <byte[]> headerParts = new List <byte[]>();
BigInteger currentOffset = arguments.Length * AbiType.UInt256.LengthInBytes;
for (int i = 0; i < arguments.Length; i++)
{
AbiType type = signature.Types[i];
if (type.IsDynamic)
{
headerParts.Add(AbiType.UInt256.Encode(currentOffset, packed));
byte[] encoded = type.Encode(arguments[i], packed);
currentOffset += encoded.Length;
dynamicParts.Add(encoded);
}
else
{
headerParts.Add(type.Encode(arguments[i], packed));
}
}
bool includeSig = encodingStyle == AbiEncodingStyle.IncludeSignature;
int sigOffset = includeSig ? 1 : 0;
byte[][] encodedParts = new byte[sigOffset + headerParts.Count + dynamicParts.Count][];
if (includeSig)
{
encodedParts[0] = ComputeAddress(signature);
}
for (int i = 0; i < headerParts.Count; i++)
{
encodedParts[sigOffset + i] = headerParts[i];
}
for (int i = 0; i < dynamicParts.Count; i++)
{
encodedParts[sigOffset + headerParts.Count + i] = dynamicParts[i];
}
return(Bytes.Concat(encodedParts));
}
public byte[] Encode(AbiSignature signature, params object[] arguments)
{
List <byte[]> dynamicParts = new List <byte[]>();
List <byte[]> headerParts = new List <byte[]>();
BigInteger currentOffset = arguments.Length * AbiType.UInt.LengthInBytes;
for (int i = 0; i < arguments.Length; i++)
{
AbiType type = signature.Types[i];
if (type.IsDynamic)
{
headerParts.Add(AbiType.UInt.Encode(currentOffset));
byte[] encoded = type.Encode(arguments[i]);
currentOffset += encoded.Length;
dynamicParts.Add(encoded);
}
else
{
headerParts.Add(type.Encode(arguments[i]));
}
}
byte[][] encodedParts = new byte[1 + headerParts.Count + dynamicParts.Count][];
encodedParts[0] = ComputeAddress(signature);
for (int i = 0; i < headerParts.Count; i++)
{
encodedParts[1 + i] = headerParts[i];
}
for (int i = 0; i < dynamicParts.Count; i++)
{
encodedParts[1 + headerParts.Count + i] = dynamicParts[i];
}
return(Bytes.Concat(encodedParts));
}
public AbiArray(AbiType elementType)
{
_elementType = elementType;
CSharpType = _elementType.CSharpType.MakeArrayType();
}
public AbiArray(AbiType elementType)
{
ElementType = elementType;
Name = $"{ElementType}[]";
CSharpType = ElementType.CSharpType.MakeArrayType();
}
internal static byte[][] EncodeSequence(int length, IEnumerable <AbiType> types, IEnumerable <object?> sequence, bool packed, int offset = 0)
{
List <byte[]> dynamicParts = new(length);
List <byte[]?> headerParts = new(length);
using IEnumerator <object?> sequenceEnumerator = sequence.GetEnumerator();
using IEnumerator <AbiType> typesEnumerator = types.GetEnumerator();
for (int i = 0; i < length; i++)
{
sequenceEnumerator.MoveNext();
typesEnumerator.MoveNext();
object? element = sequenceEnumerator.Current;
AbiType type = typesEnumerator.Current;
byte[] encoded = type.Encode(element, packed);
// encode each type
if (type.IsDynamic)
{
// offset placeholder, we cannot calculate offset before calculating all header parts
headerParts.Add(null);
dynamicParts.Add(encoded);
}
else
{
headerParts.Add(encoded);
}
}
// now lets calculate proper offset
BigInteger currentOffset = 0;
// offset of header
for (int i = 0; i < headerParts.Count; i++)
{
currentOffset += headerParts[i]?.Length ?? PaddingSize;
}
// offset dynamic parts, calculating the actual offset of each part
int dynamicPartsIndex = 0;
for (int i = 0; i < headerParts.Count; i++)
{
if (headerParts[i] is null)
{
headerParts[i] = UInt256.Encode(currentOffset, packed);
currentOffset += dynamicParts[dynamicPartsIndex++].Length;
}
}
byte[][] encodedParts = new byte[offset + headerParts.Count + dynamicParts.Count][];
for (int i = 0; i < headerParts.Count; i++)
{
encodedParts[offset + i] = headerParts[i] !;
}
for (int i = 0; i < dynamicParts.Count; i++)
{
encodedParts[offset + headerParts.Count + i] = dynamicParts[i];
}
return(encodedParts);
}
protected static void RegisterMapping <T>(AbiType abiType)
{
_typeMappings[typeof(T)] = abiType;
}