Merge pull request ethereum#24 from OffchainLabs/stylus-header

Update stylus header to 0xEFF000

core/state/statedb_arbitrum.go

@@ -38,29 +38,28 @@ var (
  // with EVM contracts, but match against these prefix bytes when loading code
  // to execute the WASMs through Stylus rather than the EVM.
  stylusEOFMagic = byte(0xEF)
- stylusEOFMagicSuffix = byte(0x00)
+ stylusEOFMagicSuffix = byte(0xF0)
  stylusEOFVersion = byte(0x00)
- stylusEOFSectionHeader = byte(0x00)
 
- StylusPrefix = []byte{stylusEOFMagic, stylusEOFMagicSuffix, stylusEOFVersion, stylusEOFSectionHeader}
+ StylusPrefix = []byte{stylusEOFMagic, stylusEOFMagicSuffix, stylusEOFVersion}
 )
 
 // IsStylusProgram checks if a specified bytecode is a user-submitted WASM program.
-// Stylus differentiates WASMs from EVM bytecode via the prefix 0xEF000000 which will safely fail
+// Stylus differentiates WASMs from EVM bytecode via the prefix 0xEFF000 which will safely fail
 // to pass through EVM-bytecode EOF validation rules.
 func IsStylusProgram(b []byte) bool {
- if len(b) < 4 {
+ if len(b) < 3 {
  return false
  }
- return b[0] == stylusEOFMagic && b[1] == stylusEOFMagicSuffix && b[2] == stylusEOFVersion && b[3] == stylusEOFSectionHeader
+ return b[0] == stylusEOFMagic && b[1] == stylusEOFMagicSuffix && b[2] == stylusEOFVersion
 }
 
 // StripStylusPrefix if the specified input is a stylus program.
 func StripStylusPrefix(b []byte) ([]byte, error) {
  if !IsStylusProgram(b) {
  return nil, errors.New("specified bytecode is not a Stylus program")
  }
- return b[4:], nil
+ return b[3:], nil
 }
 
 func (s *StateDB) GetCompiledWasmCode(addr common.Address, version uint32) []byte {