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decode_string.go
87 lines (71 loc) · 1.38 KB
/
decode_string.go
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package msgpack
import (
"reflect"
"unsafe"
)
func UnmarshalString(data []byte, v *string) error {
return NewBytesDecoder(data).DecodeString(v)
}
func (d *Decoder) DecodeString(v *string) error {
if v == nil {
return ErrDecodeNil
}
return d.decodeString(&v)
}
func UnmarshalNullableString(data []byte, v **string) error {
return NewBytesDecoder(data).DecodeNullableString(v)
}
func (d *Decoder) DecodeNullableString(v **string) error {
if v == nil {
return ErrDecodeNil
}
if *v != nil {
*v = nil
}
return d.decodeString(v)
}
func (d *Decoder) decodeStringHeader(c byte) (int, error) {
if c>>5 == 0b0101 {
return int(c & 0b00011111), nil
}
switch c {
case String8:
n, err := d.nextByte()
return int(n), err
case String16:
n, err := d.nextUint16()
return int(n), err
case String32:
n, err := d.nextUint32()
return int(n), err
default:
return 0, d.unexpectedByteErr(c)
}
}
func (d *Decoder) decodeString(v **string) error {
c, err := d.nextByte()
if err != nil {
return err
}
if *v == nil {
if c != Nil {
*v = new(string)
} else {
return nil
}
}
dataLen, err := d.decodeStringHeader(c)
if err != nil {
return err
}
data, err := d.nextByteN(dataLen)
if err != nil {
return err
}
str := reflect.StringHeader{
Data: uintptr(unsafe.Pointer(&data[0])),
Len: dataLen,
}
**v = *(*string)(unsafe.Pointer(&str))
return nil
}