/
type_conversions_string.go
63 lines (56 loc) · 1.53 KB
/
type_conversions_string.go
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package modbus
import (
"bytes"
)
func determineConverterString(byteOrder string) (fieldConverterFunc, error) {
tohost, err := endiannessConverter16(byteOrder)
if err != nil {
return nil, err
}
return func(b []byte) interface{} {
// Swap the bytes according to endianness
var buf bytes.Buffer
for i := 0; i < len(b); i += 2 {
v := tohost(b[i : i+2])
buf.WriteByte(byte(v >> 8))
buf.WriteByte(byte(v & 0xFF))
}
// Remove everything after null-termination
s, _ := bytes.CutSuffix(buf.Bytes(), []byte{0x00})
return string(s)
}, nil
}
func determineConverterStringLow(byteOrder string) (fieldConverterFunc, error) {
tohost, err := endiannessConverter16(byteOrder)
if err != nil {
return nil, err
}
return func(b []byte) interface{} {
// Swap the bytes according to endianness
var buf bytes.Buffer
for i := 0; i < len(b); i += 2 {
v := tohost(b[i : i+2])
buf.WriteByte(byte(v & 0xFF))
}
// Remove everything after null-termination
s, _ := bytes.CutSuffix(buf.Bytes(), []byte{0x00})
return string(s)
}, nil
}
func determineConverterStringHigh(byteOrder string) (fieldConverterFunc, error) {
tohost, err := endiannessConverter16(byteOrder)
if err != nil {
return nil, err
}
return func(b []byte) interface{} {
// Swap the bytes according to endianness
var buf bytes.Buffer
for i := 0; i < len(b); i += 2 {
v := tohost(b[i : i+2])
buf.WriteByte(byte(v >> 8))
}
// Remove everything after null-termination
s, _ := bytes.CutSuffix(buf.Bytes(), []byte{0x00})
return string(s)
}, nil
}