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type_conversions64.go
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type_conversions64.go
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package modbus
import (
"encoding/binary"
"fmt"
"math"
)
type convert64 func([]byte) uint64
func binaryMSWLEU64(b []byte) uint64 {
_ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
return uint64(binary.LittleEndian.Uint16(b[0:]))<<48 | uint64(binary.LittleEndian.Uint16(b[2:]))<<32 |
uint64(binary.LittleEndian.Uint16(b[4:]))<<16 | uint64(binary.LittleEndian.Uint16(b[6:]))
}
func binaryLSWBEU64(b []byte) uint64 {
_ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
return uint64(binary.BigEndian.Uint16(b[6:]))<<48 | uint64(binary.BigEndian.Uint16(b[4:]))<<32 |
uint64(binary.BigEndian.Uint16(b[2:]))<<16 | uint64(binary.BigEndian.Uint16(b[0:]))
}
func endiannessConverter64(byteOrder string) (convert64, error) {
switch byteOrder {
case "ABCD": // Big endian (Motorola)
return binary.BigEndian.Uint64, nil
case "BADC": // Big endian with bytes swapped
return binaryMSWLEU64, nil
case "CDAB": // Little endian with bytes swapped
return binaryLSWBEU64, nil
case "DCBA": // Little endian (Intel)
return binary.LittleEndian.Uint64, nil
}
return nil, fmt.Errorf("invalid byte-order: %s", byteOrder)
}
// I64 - no scale
func determineConverterI64(outType, byteOrder string) (fieldConverterFunc, error) {
tohost, err := endiannessConverter64(byteOrder)
if err != nil {
return nil, err
}
switch outType {
case "native", "INT64":
return func(b []byte) interface{} {
return int64(tohost(b))
}, nil
case "UINT64":
return func(b []byte) interface{} {
in := int64(tohost(b))
return uint64(in)
}, nil
case "FLOAT64":
return func(b []byte) interface{} {
in := int64(tohost(b))
return float64(in)
}, nil
}
return nil, fmt.Errorf("invalid output data-type: %s", outType)
}
// U64 - no scale
func determineConverterU64(outType, byteOrder string) (fieldConverterFunc, error) {
tohost, err := endiannessConverter64(byteOrder)
if err != nil {
return nil, err
}
switch outType {
case "INT64":
return func(b []byte) interface{} {
return int64(tohost(b))
}, nil
case "native", "UINT64":
return func(b []byte) interface{} {
return tohost(b)
}, nil
case "FLOAT64":
return func(b []byte) interface{} {
return float64(tohost(b))
}, nil
}
return nil, fmt.Errorf("invalid output data-type: %s", outType)
}
// F64 - no scale
func determineConverterF64(outType, byteOrder string) (fieldConverterFunc, error) {
tohost, err := endiannessConverter64(byteOrder)
if err != nil {
return nil, err
}
switch outType {
case "native", "FLOAT64":
return func(b []byte) interface{} {
raw := tohost(b)
return math.Float64frombits(raw)
}, nil
}
return nil, fmt.Errorf("invalid output data-type: %s", outType)
}
// I64 - scale
func determineConverterI64Scale(outType, byteOrder string, scale float64) (fieldConverterFunc, error) {
tohost, err := endiannessConverter64(byteOrder)
if err != nil {
return nil, err
}
switch outType {
case "native":
return func(b []byte) interface{} {
in := int64(tohost(b))
return int64(float64(in) * scale)
}, nil
case "INT64":
return func(b []byte) interface{} {
in := int64(tohost(b))
return int64(float64(in) * scale)
}, nil
case "UINT64":
return func(b []byte) interface{} {
in := int64(tohost(b))
return uint64(float64(in) * scale)
}, nil
case "FLOAT64":
return func(b []byte) interface{} {
in := int64(tohost(b))
return float64(in) * scale
}, nil
}
return nil, fmt.Errorf("invalid output data-type: %s", outType)
}
// U64 - scale
func determineConverterU64Scale(outType, byteOrder string, scale float64) (fieldConverterFunc, error) {
tohost, err := endiannessConverter64(byteOrder)
if err != nil {
return nil, err
}
switch outType {
case "native":
return func(b []byte) interface{} {
in := tohost(b)
return uint64(float64(in) * scale)
}, nil
case "INT64":
return func(b []byte) interface{} {
in := tohost(b)
return int64(float64(in) * scale)
}, nil
case "UINT64":
return func(b []byte) interface{} {
in := tohost(b)
return uint64(float64(in) * scale)
}, nil
case "FLOAT64":
return func(b []byte) interface{} {
in := tohost(b)
return float64(in) * scale
}, nil
}
return nil, fmt.Errorf("invalid output data-type: %s", outType)
}
// F64 - scale
func determineConverterF64Scale(outType, byteOrder string, scale float64) (fieldConverterFunc, error) {
tohost, err := endiannessConverter64(byteOrder)
if err != nil {
return nil, err
}
switch outType {
case "native", "FLOAT64":
return func(b []byte) interface{} {
raw := tohost(b)
in := math.Float64frombits(raw)
return in * scale
}, nil
}
return nil, fmt.Errorf("invalid output data-type: %s", outType)
}