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type_conversions32.go
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type_conversions32.go
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package modbus
import (
"encoding/binary"
"fmt"
"math"
)
type convert32 func([]byte) uint32
func binaryMSWLEU32(b []byte) uint32 {
_ = b[3] // bounds check hint to compiler; see golang.org/issue/14808
return uint32(binary.LittleEndian.Uint16(b[0:]))<<16 | uint32(binary.LittleEndian.Uint16(b[2:]))
}
func binaryLSWBEU32(b []byte) uint32 {
_ = b[3] // bounds check hint to compiler; see golang.org/issue/14808
return uint32(binary.BigEndian.Uint16(b[2:]))<<16 | uint32(binary.BigEndian.Uint16(b[0:]))
}
func endianessConverter32(byteOrder string) (convert32, error) {
switch byteOrder {
case "ABCD": // Big endian (Motorola)
return binary.BigEndian.Uint32, nil
case "BADC": // Big endian with bytes swapped
return binaryMSWLEU32, nil
case "CDAB": // Little endian with bytes swapped
return binaryLSWBEU32, nil
case "DCBA": // Little endian (Intel)
return binary.LittleEndian.Uint32, nil
}
return nil, fmt.Errorf("invalid byte-order: %s", byteOrder)
}
// I32 - no scale
func determineConverterI32(outType, byteOrder string) (fieldConverterFunc, error) {
tohost, err := endianessConverter32(byteOrder)
if err != nil {
return nil, err
}
switch outType {
case "native":
return func(b []byte) interface{} {
return int32(tohost(b))
}, nil
case "INT64":
return func(b []byte) interface{} {
return int64(int32(tohost(b)))
}, nil
case "UINT64":
return func(b []byte) interface{} {
return uint64(int32(tohost(b)))
}, nil
case "FLOAT64":
return func(b []byte) interface{} {
return float64(int32(tohost(b)))
}, nil
}
return nil, fmt.Errorf("invalid output data-type: %s", outType)
}
// U32 - no scale
func determineConverterU32(outType, byteOrder string) (fieldConverterFunc, error) {
tohost, err := endianessConverter32(byteOrder)
if err != nil {
return nil, err
}
switch outType {
case "native":
return func(b []byte) interface{} {
return tohost(b)
}, nil
case "INT64":
return func(b []byte) interface{} {
return int64(tohost(b))
}, nil
case "UINT64":
return func(b []byte) interface{} {
return uint64(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)
}
// F32 - no scale
func determineConverterF32(outType, byteOrder string) (fieldConverterFunc, error) {
tohost, err := endianessConverter32(byteOrder)
if err != nil {
return nil, err
}
switch outType {
case "native":
return func(b []byte) interface{} {
raw := tohost(b)
return math.Float32frombits(raw)
}, nil
case "FLOAT64":
return func(b []byte) interface{} {
raw := tohost(b)
in := math.Float32frombits(raw)
return float64(in)
}, nil
}
return nil, fmt.Errorf("invalid output data-type: %s", outType)
}
// I32 - scale
func determineConverterI32Scale(outType, byteOrder string, scale float64) (fieldConverterFunc, error) {
tohost, err := endianessConverter32(byteOrder)
if err != nil {
return nil, err
}
switch outType {
case "native":
return func(b []byte) interface{} {
in := int32(tohost(b))
return int32(float64(in) * scale)
}, nil
case "INT64":
return func(b []byte) interface{} {
in := int32(tohost(b))
return int64(float64(in) * scale)
}, nil
case "UINT64":
return func(b []byte) interface{} {
in := int32(tohost(b))
return uint64(float64(in) * scale)
}, nil
case "FLOAT64":
return func(b []byte) interface{} {
in := int32(tohost(b))
return float64(in) * scale
}, nil
}
return nil, fmt.Errorf("invalid output data-type: %s", outType)
}
// U32 - scale
func determineConverterU32Scale(outType, byteOrder string, scale float64) (fieldConverterFunc, error) {
tohost, err := endianessConverter32(byteOrder)
if err != nil {
return nil, err
}
switch outType {
case "native":
return func(b []byte) interface{} {
in := tohost(b)
return uint32(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)
}
// F32 - scale
func determineConverterF32Scale(outType, byteOrder string, scale float64) (fieldConverterFunc, error) {
tohost, err := endianessConverter32(byteOrder)
if err != nil {
return nil, err
}
switch outType {
case "native":
return func(b []byte) interface{} {
raw := tohost(b)
in := math.Float32frombits(raw)
return float32(float64(in) * scale)
}, nil
case "FLOAT64":
return func(b []byte) interface{} {
raw := tohost(b)
in := math.Float32frombits(raw)
return float64(in) * scale
}, nil
}
return nil, fmt.Errorf("invalid output data-type: %s", outType)
}