485 lines
12 KiB
Go
485 lines
12 KiB
Go
package ssob
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import (
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"encoding/binary"
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"fmt"
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"io"
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"math"
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"reflect"
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)
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func MarshalString(in string) (ret []byte) {
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l := int32(len(in))
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b := MarshalInt32(l)
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ret = make([]byte, int(l)+len(b))
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copy(ret, b)
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copy(ret[4:], []byte(in))
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return ret
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}
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func MarshalBool(in bool) (ret []byte) {
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if in {
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return []byte{byte(0)}
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}
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return []byte{byte(1)}
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}
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func MarshalInt8(in int8) (ret []byte) {
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return []byte{byte(in)}
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}
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func MarshalUint8(in uint8) (ret []byte) {
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return []byte{byte(in)}
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}
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func MarshalInt16(in int16) (ret []byte) {
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out := make([]byte, 2)
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binary.BigEndian.PutUint16(out, uint16(in))
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return out
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}
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func MarshalUint16(in uint16) (ret []byte) {
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out := make([]byte, 2)
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binary.BigEndian.PutUint16(out, in)
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return out
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}
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func MarshalInt32(in int32) (ret []byte) {
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out := make([]byte, 4)
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binary.BigEndian.PutUint32(out, uint32(in))
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return out
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}
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func MarshalUint32(in uint32) (ret []byte) {
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out := make([]byte, 4)
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binary.BigEndian.PutUint32(out, in)
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return out
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}
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func MarshalFloat32(in float32) (ret []byte) {
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out := make([]byte, 4)
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binary.BigEndian.PutUint32(out, math.Float32bits(in))
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return out
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}
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func MarshalInt64(in int64) (ret []byte) {
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out := make([]byte, 8)
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binary.BigEndian.PutUint64(out, uint64(in))
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return out
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}
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func MarshalUint64(in uint64) (ret []byte) {
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out := make([]byte, 8)
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binary.BigEndian.PutUint64(out, in)
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return out
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}
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func MarshalFloat64(in float64) (ret []byte) {
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out := make([]byte, 8)
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binary.BigEndian.PutUint64(out, math.Float64bits(in))
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return out
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}
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type MarshalFunc func(e interface{}) (ret []byte, err error)
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var encoderCache map[string]MarshalFunc
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func init() {
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encoderCache = make(map[string]MarshalFunc)
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RegisterEncoder("bool", func(e interface{}) (ret []byte, err error) {
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if i, ok := e.(bool); ok {
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return MarshalBool(i), nil
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}
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return nil, fmt.Errorf("ssob: Incompatible type - expected bool: %w", ErrTypeMismatch)
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})
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RegisterEncoder("int8", func(e interface{}) (ret []byte, err error) {
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if i, ok := e.(int8); ok {
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return MarshalInt8(i), nil
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}
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return nil, fmt.Errorf("ssob: Incompatible type - expected int8: %w", ErrTypeMismatch)
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})
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RegisterEncoder("uint8", func(e interface{}) (ret []byte, err error) {
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if i, ok := e.(uint8); ok {
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return MarshalUint8(i), nil
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}
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return nil, fmt.Errorf("ssob: Incompatible type - expected uint8: %w", ErrTypeMismatch)
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})
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RegisterEncoder("int16", func(e interface{}) (ret []byte, err error) {
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if i, ok := e.(int16); ok {
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return MarshalInt16(i), nil
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}
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return nil, fmt.Errorf("ssob: Incompatible type - expected int16: %w", ErrTypeMismatch)
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})
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RegisterEncoder("uint16", func(e interface{}) (ret []byte, err error) {
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if i, ok := e.(uint16); ok {
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return MarshalUint16(i), nil
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}
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return nil, fmt.Errorf("ssob: Incompatible type - expected uint16: %w", ErrTypeMismatch)
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})
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RegisterEncoder("int32", func(e interface{}) (ret []byte, err error) {
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if i, ok := e.(int32); ok {
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return MarshalInt32(i), nil
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}
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return nil, fmt.Errorf("ssob: Incompatible type - expected int32: %w", ErrTypeMismatch)
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})
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RegisterEncoder("uint32", func(e interface{}) (ret []byte, err error) {
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if i, ok := e.(uint32); ok {
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return MarshalUint32(i), nil
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}
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return nil, fmt.Errorf("ssob: Incompatible type - expected uint32: %w", ErrTypeMismatch)
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})
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RegisterEncoder("float32", func(e interface{}) (ret []byte, err error) {
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if i, ok := e.(float32); ok {
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return MarshalFloat32(i), nil
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}
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return nil, fmt.Errorf("ssob: Incompatible type - expected float32: %w", ErrTypeMismatch)
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})
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RegisterEncoder("int64", func(e interface{}) (ret []byte, err error) {
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if i, ok := e.(int64); ok {
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return MarshalInt64(i), nil
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}
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return nil, fmt.Errorf("ssob: Incompatible type - expected int64: %w", ErrTypeMismatch)
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})
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RegisterEncoder("uint64", func(e interface{}) (ret []byte, err error) {
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if i, ok := e.(uint64); ok {
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return MarshalUint64(i), nil
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}
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return nil, fmt.Errorf("ssob: Incompatible type - expected uint64: %w", ErrTypeMismatch)
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})
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RegisterEncoder("float64", func(e interface{}) (ret []byte, err error) {
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if i, ok := e.(float64); ok {
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return MarshalFloat64(i), nil
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}
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return nil, fmt.Errorf("ssob: Incompatible type - expected float64: %w", ErrTypeMismatch)
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})
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RegisterEncoder("string", func(e interface{}) (ret []byte, err error) {
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if i, ok := e.(string); ok {
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return MarshalString(i), nil
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}
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return nil, fmt.Errorf("ssob: Incompatible type - expected string: %w", ErrTypeMismatch)
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})
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}
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func encRegister(e interface{}) (err error) {
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t := reflect.TypeOf(e)
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if t == nil {
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return fmt.Errorf("ssob: nil type: %w", ErrTypeInvalid)
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}
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switch t.Kind() {
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case reflect.Invalid:
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return fmt.Errorf("ssob: invalid type: %w", ErrTypeInvalid)
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case reflect.Array:
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f := func(e interface{}) (ret []byte, err error) {
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v := reflect.ValueOf(e)
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l := v.Len()
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slen := MarshalInt32(int32(l))
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blen := 4
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bs := make([][]byte, l)
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for i := 0; i < l; i++ {
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bs[i], err = marshal(v.Index(i).Interface())
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if err != nil {
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return nil, err
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}
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blen += len(bs[i])
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}
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ret = make([]byte, blen)
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i := copy(ret, slen)
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for c := 0; c < l; c++ {
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i += copy(ret[i:], bs[c])
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}
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return ret, nil
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}
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encoderCache[string(t.Kind())] = f
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case reflect.Slice:
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f := func(e interface{}) (ret []byte, err error) {
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v := reflect.ValueOf(e)
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l := v.Len()
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slen := MarshalInt32(int32(l))
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blen := 4
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bs := make([][]byte, l)
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for i := 0; i < l; i++ {
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bs[i], err = marshal(v.Index(i).Interface())
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if err != nil {
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return nil, err
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}
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blen += len(bs[i])
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}
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ret = make([]byte, blen)
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i := copy(ret, slen)
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for c := 0; c < l; c++ {
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i += copy(ret[i:], bs[c])
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}
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return ret, nil
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}
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encoderCache[string(t.Kind())] = f
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case reflect.Map:
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f := func(e interface{}) (ret []byte, err error) {
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v := reflect.ValueOf(e)
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l := v.Len()
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ret = MarshalInt32(int32(l))
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for _, ek := range v.MapKeys() {
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ee := v.MapIndex(ek)
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b, err := marshal(ek.Interface())
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if err != nil {
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return nil, err
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}
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ret = append(ret, b...)
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b, err = marshal(ee.Interface())
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if err != nil {
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return nil, err
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}
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ret = append(ret, b...)
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}
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return ret, nil
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}
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encoderCache[string(t.Kind())] = f
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case reflect.Struct:
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zt := reflect.New(t)
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n := zt.Elem().NumField()
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mfields := []int{}
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for i := 0; i < n; i++ {
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if zt.Elem().Field(i).CanSet() {
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mfields = append(mfields, i)
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}
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}
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if len(mfields) == 0 {
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return fmt.Errorf("ssob: No exported fields for %s: %w", string(t.Name()), ErrParseFailed)
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}
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f := func(e interface{}) (ret []byte, err error) {
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v := reflect.ValueOf(e)
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bs := make([][]byte, n)
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blen := 0
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for _, i := range mfields {
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bs[i], err = marshal(v.Field(i).Interface())
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if err != nil {
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return nil, err
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}
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blen += len(bs[i])
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}
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ret = make([]byte, blen)
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i := 0
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for c := 0; c < n; c++ {
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i += copy(ret[i:], bs[c])
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}
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return ret, nil
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}
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encoderCache[t.Name()] = f
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case reflect.Bool:
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f := func(e interface{}) (ret []byte, err error) {
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v := reflect.ValueOf(e)
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return marshalBaseType(bool(v.Bool()))
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}
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encoderCache[t.Name()] = f
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case reflect.Uint8:
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f := func(e interface{}) (ret []byte, err error) {
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v := reflect.ValueOf(e)
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return marshalBaseType(uint8(v.Uint()))
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}
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encoderCache[t.Name()] = f
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case reflect.Uint16:
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f := func(e interface{}) (ret []byte, err error) {
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v := reflect.ValueOf(e)
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return marshalBaseType(uint16(v.Uint()))
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}
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encoderCache[t.Name()] = f
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case reflect.Uint32:
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f := func(e interface{}) (ret []byte, err error) {
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v := reflect.ValueOf(e)
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return marshalBaseType(uint32(v.Uint()))
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}
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encoderCache[t.Name()] = f
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case reflect.Uint64:
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f := func(e interface{}) (ret []byte, err error) {
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v := reflect.ValueOf(e)
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return marshalBaseType(uint64(v.Uint()))
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}
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encoderCache[t.Name()] = f
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case reflect.Int8:
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f := func(e interface{}) (ret []byte, err error) {
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v := reflect.ValueOf(e)
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return marshalBaseType(int8(v.Uint()))
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}
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encoderCache[t.Name()] = f
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case reflect.Int16:
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f := func(e interface{}) (ret []byte, err error) {
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v := reflect.ValueOf(e)
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return marshalBaseType(int16(v.Uint()))
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}
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encoderCache[t.Name()] = f
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case reflect.Int32:
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f := func(e interface{}) (ret []byte, err error) {
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v := reflect.ValueOf(e)
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return marshalBaseType(int32(v.Uint()))
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}
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encoderCache[t.Name()] = f
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case reflect.Int64:
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f := func(e interface{}) (ret []byte, err error) {
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v := reflect.ValueOf(e)
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return marshalBaseType(int64(v.Uint()))
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}
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encoderCache[t.Name()] = f
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case reflect.String:
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f := func(e interface{}) (ret []byte, err error) {
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v := reflect.ValueOf(e)
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return marshalBaseType(string(v.String()))
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}
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encoderCache[t.Name()] = f
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default:
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return fmt.Errorf("ssob: %s: %w", string(t.Name()), ErrTypeUnknown)
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}
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return nil
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}
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func marshalBaseType(e interface{}) (ret []byte, err error) {
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switch t := e.(type) {
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case bool:
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return encoderCache["bool"](t)
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case int8:
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return encoderCache["int8"](t)
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case uint8:
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return encoderCache["uint8"](t)
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case int16:
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return encoderCache["int16"](t)
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case uint16:
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return encoderCache["uint16"](t)
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case int32:
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return encoderCache["int32"](t)
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case uint32:
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return encoderCache["uint32"](t)
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case int64:
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return encoderCache["int64"](t)
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case uint64:
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return encoderCache["uint64"](t)
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case float32:
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return encoderCache["float32"](t)
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case float64:
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return encoderCache["float64"](t)
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case string:
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return encoderCache["string"](t)
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default:
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return nil, fmt.Errorf("ssob: No base type: %w", ErrTypeUnknown)
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}
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}
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func marshal(e interface{}) (ret []byte, err error) {
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ret, err = marshalBaseType(e)
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if err == nil {
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return ret, err
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}
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var key string
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t := reflect.TypeOf(e)
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v := reflect.ValueOf(e)
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switch t.Kind() {
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case reflect.Ptr:
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if v.IsNil() {
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return nil, fmt.Errorf("ssob: Cannot marshal nil pointer: %w", ErrValueInvalid)
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}
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p := reflect.Indirect(v)
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return marshal(p.Interface())
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case reflect.Bool, reflect.Int8, reflect.Int16, reflect.Int32,
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reflect.Int64, reflect.Uint8, reflect.Uint16, reflect.Uint32,
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reflect.Uint64, reflect.String, reflect.Struct:
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key = t.Name()
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default:
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key = string(t.Kind())
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}
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if f, ok := encoderCache[key]; ok {
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return f(e)
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} else {
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err = encRegister(e)
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if err != nil {
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return nil, err
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}
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}
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return marshal(e)
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}
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func RegisterEncoder(name string, f MarshalFunc) {
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encoderCache[name] = f
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}
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func baseTypeMarshaller(e interface{}, w io.Writer) (err error) {
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var sb []byte
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switch e.(type) {
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case bool:
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sb = make([]byte, ST_ID_SIZE+1)
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binary.BigEndian.PutUint32(sb, ST_BOOL)
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if e.(bool) == true {
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sb[ST_ID_SIZE] = 0
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} else {
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sb[ST_ID_SIZE] = 1
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}
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case uint8:
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sb = make([]byte, ST_ID_SIZE+1)
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binary.BigEndian.PutUint32(sb, ST_UINT8)
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sb[ST_ID_SIZE] = byte(e.(uint8))
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case uint16:
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sb = make([]byte, ST_ID_SIZE+2)
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binary.BigEndian.PutUint32(sb, ST_UINT16)
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binary.BigEndian.PutUint16(sb[ST_ID_SIZE:], e.(uint16))
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case uint32:
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sb = make([]byte, ST_ID_SIZE+4)
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binary.BigEndian.PutUint32(sb, ST_UINT32)
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binary.BigEndian.PutUint32(sb[ST_ID_SIZE:], e.(uint32))
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case uint64:
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sb = make([]byte, ST_ID_SIZE+8)
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binary.BigEndian.PutUint32(sb, ST_UINT64)
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binary.BigEndian.PutUint64(sb[ST_ID_SIZE:], e.(uint64))
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case int8:
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sb = make([]byte, ST_ID_SIZE+1)
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binary.BigEndian.PutUint32(sb[ST_ID_SIZE:], ST_INT8)
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sb[ST_ID_SIZE] = byte(e.(int8))
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case int16:
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sb = make([]byte, ST_ID_SIZE+2)
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binary.BigEndian.PutUint32(sb, ST_INT16)
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binary.BigEndian.PutUint16(sb[ST_ID_SIZE:], uint16(e.(int16)))
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case int32:
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sb = make([]byte, ST_ID_SIZE+4)
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binary.BigEndian.PutUint32(sb, ST_INT32)
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binary.BigEndian.PutUint32(sb[ST_ID_SIZE:], uint32(e.(int32)))
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case int64:
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sb = make([]byte, ST_ID_SIZE+8)
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binary.BigEndian.PutUint32(sb, ST_INT64)
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binary.BigEndian.PutUint64(sb[ST_ID_SIZE:], uint64(e.(int64)))
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case float32:
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sb = make([]byte, ST_ID_SIZE+4)
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binary.BigEndian.PutUint32(sb, ST_FLOAT32)
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binary.BigEndian.PutUint32(sb[ST_ID_SIZE:], math.Float32bits(e.(float32)))
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case float64:
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sb = make([]byte, ST_ID_SIZE+8)
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binary.BigEndian.PutUint32(sb, ST_FLOAT64)
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binary.BigEndian.PutUint64(sb[ST_ID_SIZE:], math.Float64bits(e.(float64)))
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case string:
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slen := len(e.(string))
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sb = make([]byte, ST_ID_SIZE+slen+4)
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binary.BigEndian.PutUint32(sb, ST_STRING)
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binary.BigEndian.PutUint32(sb[ST_ID_SIZE:], uint32(slen))
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copy(sb[ST_ID_SIZE+4:], []byte(e.(string)))
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default:
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return fmt.Errorf("ssob: Unknown type: %s: %w", reflect.TypeOf(e), ErrValueInvalid)
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}
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return binary.Write(w, binary.BigEndian, sb)
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}
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