feat(core): changes based on the latest block.extradata format (#295)

Author: davidtaikocha

core/state_processor.go

@@ -172,8 +172,7 @@ func ApplyTransaction(config *params.ChainConfig, bc ChainContext, author *commo
 	// CHANGE(taiko): decode the basefeeSharingPctg config from the extradata, and
 	// add it to the Message, if its an ontake block.
 	if config.IsOntake(header.Number) {
-		basefeeSharingPctg, _ := DecodeOntakeExtraData(header.Extra)
-		msg.BasefeeSharingPctg = basefeeSharingPctg
+		msg.BasefeeSharingPctg = DecodeOntakeExtraData(header.Extra)
 	}
 	// Create a new context to be used in the EVM environment
 	blockContext := NewEVMBlockContext(header, bc, author)

core/state_transition.go

@@ -538,21 +538,8 @@ func (st *StateTransition) getTreasuryAddress() common.Address {
 	)
 }
 
-// DecodeOntakeExtraData decodes an ontake block's extradata,
-// returns basefeeSharingPctg and blockGasTargetMillion configurations.
-func DecodeOntakeExtraData(extradata []byte) (uint8, uint8) {
-	// Convert []byte to *big.Int
-	extra := new(big.Int).SetBytes(extradata)
-
-	// Define the masks.
-	blockGasTargetMillionMask := big.NewInt(0xFF) // 8 bits mask for _blockGasTargetMillion
-	basefeeSharingPctgMask := big.NewInt(0xFF)    // 8 bits mask for _basefeeSharingPctg
-
-	// Extract _blockGasTargetMillion.
-	blockGasTargetMillion := new(big.Int).And(extra, blockGasTargetMillionMask).Uint64()
-
-	// Shift right by 8 bits to get the _basefeeSharingPctg part.
-	basefeeSharingPctg := new(big.Int).Rsh(extra, 8).And(basefeeSharingPctgMask, basefeeSharingPctgMask).Uint64()
-
-	return uint8(basefeeSharingPctg), uint8(blockGasTargetMillion)
+// DecodeOntakeExtraData decodes an ontake block's extradata, returns basefeeSharingPctg configurations,
+// the corresponding enocding function in protocol is `LibProposing._encodeGasConfigs`.
+func DecodeOntakeExtraData(extradata []byte) uint8 {
+	return uint8(new(big.Int).SetBytes(extradata).Uint64())
 }