Support different lenght of extended address

Author: facchinm

gohex.go

@@ -9,10 +9,11 @@ import (
 
 // Constants definitions of IntelHex record types
 const (
-	_DATA_RECORD    byte = 0 // Record with data bytes
-	_EOF_RECORD     byte = 1 // Record with end of file indicator
-	_ADDRESS_RECORD byte = 4 // Record with extended linear address
-	_START_RECORD   byte = 5 // Record with start linear address
+	_DATA_RECORD     byte = 0 // Record with data bytes
+	_EOF_RECORD      byte = 1 // Record with end of file indicator
+	_EXTENDED_RECORD byte = 2
+	_ADDRESS_RECORD  byte = 4 // Record with extended linear address
+	_START_RECORD    byte = 5 // Record with start linear address
 )
 
 // Structure with binary data segment fields
@@ -222,6 +223,9 @@ func (m *Memory) parseIntelHexRecord(bytes []byte) error {
 			return newParseError(_RECORD_ERROR, err.Error(), m.lineNum)
 		}
 		m.eofFlag = true
+	case _EXTENDED_RECORD:
+		//Extended 8086 Segment Record
+		fallthrough
 	case _ADDRESS_RECORD:
 		m.extendedAddress, err = getExtendedAddress(bytes)
 		if err != nil {

helper.go

@@ -52,7 +52,7 @@ func getExtendedAddress(bytes []byte) (adr uint32, err error) {
 	if binary.BigEndian.Uint16(bytes[1:3]) != 0 {
 		return 0, errors.New("incorrect address field in extended linear address line")
 	}
-	adr = uint32(binary.BigEndian.Uint16(bytes[4:6])) << 16
+	adr = uint32(binary.BigEndian.Uint16(bytes[4:6])) << (1 << bytes[3])
 	return adr, nil
 }