WIP: geth-tavum

1 files changed, 0 insertions, 295 deletions

diff --git a/accounts/abi/unpack.go b/accounts/abi/unpack.go
deleted file mode 100644
index d3cd310..0000000
--- a/accounts/abi/unpack.go
+++ /dev/null
@@ -1,295 +0,0 @@
-// Copyright 2017 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-package abi
-
-import (
-	"encoding/binary"
-	"fmt"
-	"math/big"
-	"reflect"
-
-	"github.com/ava-labs/go-ethereum/common"
-)
-
-var (
-	maxUint256 = big.NewInt(0).Add(
-		big.NewInt(0).Exp(big.NewInt(2), big.NewInt(256), nil),
-		big.NewInt(-1))
-	maxInt256 = big.NewInt(0).Add(
-		big.NewInt(0).Exp(big.NewInt(2), big.NewInt(255), nil),
-		big.NewInt(-1))
-)
-
-// reads the integer based on its kind
-func readInteger(typ byte, kind reflect.Kind, b []byte) interface{} {
-	switch kind {
-	case reflect.Uint8:
-		return b[len(b)-1]
-	case reflect.Uint16:
-		return binary.BigEndian.Uint16(b[len(b)-2:])
-	case reflect.Uint32:
-		return binary.BigEndian.Uint32(b[len(b)-4:])
-	case reflect.Uint64:
-		return binary.BigEndian.Uint64(b[len(b)-8:])
-	case reflect.Int8:
-		return int8(b[len(b)-1])
-	case reflect.Int16:
-		return int16(binary.BigEndian.Uint16(b[len(b)-2:]))
-	case reflect.Int32:
-		return int32(binary.BigEndian.Uint32(b[len(b)-4:]))
-	case reflect.Int64:
-		return int64(binary.BigEndian.Uint64(b[len(b)-8:]))
-	default:
-		// the only case lefts for integer is int256/uint256.
-		// big.SetBytes can't tell if a number is negative, positive on itself.
-		// On EVM, if the returned number > max int256, it is negative.
-		ret := new(big.Int).SetBytes(b)
-		if typ == UintTy {
-			return ret
-		}
-
-		if ret.Cmp(maxInt256) > 0 {
-			ret.Add(maxUint256, big.NewInt(0).Neg(ret))
-			ret.Add(ret, big.NewInt(1))
-			ret.Neg(ret)
-		}
-		return ret
-	}
-}
-
-// reads a bool
-func readBool(word []byte) (bool, error) {
-	for _, b := range word[:31] {
-		if b != 0 {
-			return false, errBadBool
-		}
-	}
-	switch word[31] {
-	case 0:
-		return false, nil
-	case 1:
-		return true, nil
-	default:
-		return false, errBadBool
-	}
-}
-
-// A function type is simply the address with the function selection signature at the end.
-// This enforces that standard by always presenting it as a 24-array (address + sig = 24 bytes)
-func readFunctionType(t Type, word []byte) (funcTy [24]byte, err error) {
-	if t.T != FunctionTy {
-		return [24]byte{}, fmt.Errorf("abi: invalid type in call to make function type byte array")
-	}
-	if garbage := binary.BigEndian.Uint64(word[24:32]); garbage != 0 {
-		err = fmt.Errorf("abi: got improperly encoded function type, got %v", word)
-	} else {
-		copy(funcTy[:], word[0:24])
-	}
-	return
-}
-
-// through reflection, creates a fixed array to be read from
-func readFixedBytes(t Type, word []byte) (interface{}, error) {
-	if t.T != FixedBytesTy {
-		return nil, fmt.Errorf("abi: invalid type in call to make fixed byte array")
-	}
-	// convert
-	array := reflect.New(t.Type).Elem()
-
-	reflect.Copy(array, reflect.ValueOf(word[0:t.Size]))
-	return array.Interface(), nil
-
-}
-
-// iteratively unpack elements
-func forEachUnpack(t Type, output []byte, start, size int) (interface{}, error) {
-	if size < 0 {
-		return nil, fmt.Errorf("cannot marshal input to array, size is negative (%d)", size)
-	}
-	if start+32*size > len(output) {
-		return nil, fmt.Errorf("abi: cannot marshal in to go array: offset %d would go over slice boundary (len=%d)", len(output), start+32*size)
-	}
-
-	// this value will become our slice or our array, depending on the type
-	var refSlice reflect.Value
-
-	if t.T == SliceTy {
-		// declare our slice
-		refSlice = reflect.MakeSlice(t.Type, size, size)
-	} else if t.T == ArrayTy {
-		// declare our array
-		refSlice = reflect.New(t.Type).Elem()
-	} else {
-		return nil, fmt.Errorf("abi: invalid type in array/slice unpacking stage")
-	}
-
-	// Arrays have packed elements, resulting in longer unpack steps.
-	// Slices have just 32 bytes per element (pointing to the contents).
-	elemSize := getTypeSize(*t.Elem)
-
-	for i, j := start, 0; j < size; i, j = i+elemSize, j+1 {
-		inter, err := toGoType(i, *t.Elem, output)
-		if err != nil {
-			return nil, err
-		}
-
-		// append the item to our reflect slice
-		refSlice.Index(j).Set(reflect.ValueOf(inter))
-	}
-
-	// return the interface
-	return refSlice.Interface(), nil
-}
-
-func forTupleUnpack(t Type, output []byte) (interface{}, error) {
-	retval := reflect.New(t.Type).Elem()
-	virtualArgs := 0
-	for index, elem := range t.TupleElems {
-		marshalledValue, err := toGoType((index+virtualArgs)*32, *elem, output)
-		if elem.T == ArrayTy && !isDynamicType(*elem) {
-			// If we have a static array, like [3]uint256, these are coded as
-			// just like uint256,uint256,uint256.
-			// This means that we need to add two 'virtual' arguments when
-			// we count the index from now on.
-			//
-			// Array values nested multiple levels deep are also encoded inline:
-			// [2][3]uint256: uint256,uint256,uint256,uint256,uint256,uint256
-			//
-			// Calculate the full array size to get the correct offset for the next argument.
-			// Decrement it by 1, as the normal index increment is still applied.
-			virtualArgs += getTypeSize(*elem)/32 - 1
-		} else if elem.T == TupleTy && !isDynamicType(*elem) {
-			// If we have a static tuple, like (uint256, bool, uint256), these are
-			// coded as just like uint256,bool,uint256
-			virtualArgs += getTypeSize(*elem)/32 - 1
-		}
-		if err != nil {
-			return nil, err
-		}
-		retval.Field(index).Set(reflect.ValueOf(marshalledValue))
-	}
-	return retval.Interface(), nil
-}
-
-// toGoType parses the output bytes and recursively assigns the value of these bytes
-// into a go type with accordance with the ABI spec.
-func toGoType(index int, t Type, output []byte) (interface{}, error) {
-	if index+32 > len(output) {
-		return nil, fmt.Errorf("abi: cannot marshal in to go type: length insufficient %d require %d", len(output), index+32)
-	}
-
-	var (
-		returnOutput  []byte
-		begin, length int
-		err           error
-	)
-
-	// if we require a length prefix, find the beginning word and size returned.
-	if t.requiresLengthPrefix() {
-		begin, length, err = lengthPrefixPointsTo(index, output)
-		if err != nil {
-			return nil, err
-		}
-	} else {
-		returnOutput = output[index : index+32]
-	}
-
-	switch t.T {
-	case TupleTy:
-		if isDynamicType(t) {
-			begin, err := tuplePointsTo(index, output)
-			if err != nil {
-				return nil, err
-			}
-			return forTupleUnpack(t, output[begin:])
-		} else {
-			return forTupleUnpack(t, output[index:])
-		}
-	case SliceTy:
-		return forEachUnpack(t, output[begin:], 0, length)
-	case ArrayTy:
-		if isDynamicType(*t.Elem) {
-			offset := int64(binary.BigEndian.Uint64(returnOutput[len(returnOutput)-8:]))
-			return forEachUnpack(t, output[offset:], 0, t.Size)
-		}
-		return forEachUnpack(t, output[index:], 0, t.Size)
-	case StringTy: // variable arrays are written at the end of the return bytes
-		return string(output[begin : begin+length]), nil
-	case IntTy, UintTy:
-		return readInteger(t.T, t.Kind, returnOutput), nil
-	case BoolTy:
-		return readBool(returnOutput)
-	case AddressTy:
-		return common.BytesToAddress(returnOutput), nil
-	case HashTy:
-		return common.BytesToHash(returnOutput), nil
-	case BytesTy:
-		return output[begin : begin+length], nil
-	case FixedBytesTy:
-		return readFixedBytes(t, returnOutput)
-	case FunctionTy:
-		return readFunctionType(t, returnOutput)
-	default:
-		return nil, fmt.Errorf("abi: unknown type %v", t.T)
-	}
-}
-
-// interprets a 32 byte slice as an offset and then determines which indice to look to decode the type.
-func lengthPrefixPointsTo(index int, output []byte) (start int, length int, err error) {
-	bigOffsetEnd := big.NewInt(0).SetBytes(output[index : index+32])
-	bigOffsetEnd.Add(bigOffsetEnd, common.Big32)
-	outputLength := big.NewInt(int64(len(output)))
-
-	if bigOffsetEnd.Cmp(outputLength) > 0 {
-		return 0, 0, fmt.Errorf("abi: cannot marshal in to go slice: offset %v would go over slice boundary (len=%v)", bigOffsetEnd, outputLength)
-	}
-
-	if bigOffsetEnd.BitLen() > 63 {
-		return 0, 0, fmt.Errorf("abi offset larger than int64: %v", bigOffsetEnd)
-	}
-
-	offsetEnd := int(bigOffsetEnd.Uint64())
-	lengthBig := big.NewInt(0).SetBytes(output[offsetEnd-32 : offsetEnd])
-
-	totalSize := big.NewInt(0)
-	totalSize.Add(totalSize, bigOffsetEnd)
-	totalSize.Add(totalSize, lengthBig)
-	if totalSize.BitLen() > 63 {
-		return 0, 0, fmt.Errorf("abi: length larger than int64: %v", totalSize)
-	}
-
-	if totalSize.Cmp(outputLength) > 0 {
-		return 0, 0, fmt.Errorf("abi: cannot marshal in to go type: length insufficient %v require %v", outputLength, totalSize)
-	}
-	start = int(bigOffsetEnd.Uint64())
-	length = int(lengthBig.Uint64())
-	return
-}
-
-// tuplePointsTo resolves the location reference for dynamic tuple.
-func tuplePointsTo(index int, output []byte) (start int, err error) {
-	offset := big.NewInt(0).SetBytes(output[index : index+32])
-	outputLen := big.NewInt(int64(len(output)))
-
-	if offset.Cmp(big.NewInt(int64(len(output)))) > 0 {
-		return 0, fmt.Errorf("abi: cannot marshal in to go slice: offset %v would go over slice boundary (len=%v)", offset, outputLen)
-	}
-	if offset.BitLen() > 63 {
-		return 0, fmt.Errorf("abi offset larger than int64: %v", offset)
-	}
-	return int(offset.Uint64()), nil
-}