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decoder.go
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/
decoder.go
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package encs
import (
"fmt"
"io"
"reflect"
"unsafe"
"github.com/stewi1014/encs/encio"
"github.com/stewi1014/encs/encodable"
)
func NewDecoder(r io.Reader, config *Config) *Decoder {
config = config.copyAndFill()
return &Decoder{
r: r,
resolver: config.Resolver,
source: encodable.NewSource(&encodable.Config{
Resolver: config.Resolver,
}, encodable.New),
}
}
type Decoder struct {
r io.Reader
resolver encodable.Resolver
source *encodable.Source
}
func (d *Decoder) Decode(v interface{}) error {
if v == nil {
return encio.NewError(encio.ErrNilPointer, "cannot decode into nil interface", 0)
}
val := reflect.ValueOf(v)
if val.Kind() != reflect.Ptr {
return encio.NewError(encio.ErrBadType, fmt.Sprintf("decoded values must be passed by reference (pointer), got %v", val.Type()), 0)
}
if val.IsNil() {
return encio.NewError(encio.ErrNilPointer, "cannot decode into nil pointer", 0)
}
val = val.Elem()
if !val.CanSet() {
return encio.NewError(encio.ErrBadType, fmt.Sprintf("%v is not mutable", val.Type()), 0)
}
ty, err := d.resolver.Decode(val.Type(), d.r)
if err != nil {
return err
}
if ty != val.Type() {
return encio.NewError(encio.ErrBadType, fmt.Sprintf("cannot set %v to received type %v", val.Type(), ty), 0)
}
return d.source.GetEncodable(ty).Decode(unsafe.Pointer(val.UnsafeAddr()), d.r)
}