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map.go
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map.go
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package proto
import (
"fmt"
"reflect"
"sync"
"unsafe"
. "github.com/RomiChan/protobuf/internal/runtime_reflect"
)
const zeroSize = 1 // sizeOfVarint(0)
type mapField struct {
wiretag uint64
keyField *structField
valField *structField
}
func (w *walker) mapCodec(t reflect.Type, f *mapField) *codec {
m := new(codec)
w.codecs[t] = m
m.size = mapSizeFuncOf(t, f)
m.encode = mapEncodeFuncOf(t, f)
m.decode = mapDecodeFuncOf(t, f, w)
return m
}
func mapSizeFuncOf(t reflect.Type, f *mapField) sizeFunc {
mapTagSize := sizeOfVarint(f.wiretag)
keyCodec := f.keyField.codec
valCodec := f.valField.codec
return func(p unsafe.Pointer, sf *structField) int {
if p == nil {
return 0
}
p = *(*unsafe.Pointer)(p)
n := 0
m := MapIter{}
defer m.Done()
for m.Init(pointer(t), p); m.HasNext(); m.Next() {
keySize := keyCodec.size(m.Key(), f.keyField)
valSize := valCodec.size(m.Value(), f.valField)
n += mapTagSize + sizeOfVarint(uint64(keySize+valSize)) + keySize + valSize
}
if n == 0 {
n = mapTagSize + zeroSize
}
return n
}
}
func mapEncodeFuncOf(t reflect.Type, f *mapField) encodeFunc {
mapTag := appendVarint(nil, f.wiretag)
zero := append(mapTag, 0)
keyCodec := f.keyField.codec
valCodec := f.valField.codec
return func(b []byte, p unsafe.Pointer, sf *structField) []byte {
if p == nil {
return b
}
p = *(*unsafe.Pointer)(p)
origLen := len(b)
m := MapIter{}
defer m.Done()
for m.Init(pointer(t), p); m.HasNext(); m.Next() {
key := m.Key()
val := m.Value()
keySize := keyCodec.size(key, f.keyField)
valSize := keyCodec.size(val, f.valField)
elemSize := keySize + valSize
b = append(b, mapTag...)
b = appendVarint(b, uint64(elemSize))
b = keyCodec.encode(b, key, f.keyField)
b = valCodec.encode(b, val, f.valField)
}
if len(b) == origLen {
b = append(b, zero...)
}
return b
}
}
func formatWireTag(wire uint64) reflect.StructTag {
return reflect.StructTag(fmt.Sprintf(`protobuf:"%s,%d,opt"`, wireType(wire&7), wire>>3))
}
func mapDecodeFuncOf(t reflect.Type, m *mapField, w *walker) decodeFunc {
structType := reflect.StructOf([]reflect.StructField{
{Name: "Key", Type: t.Key(), Tag: formatWireTag(m.keyField.wiretag)},
{Name: "Elem", Type: t.Elem(), Tag: formatWireTag(m.valField.wiretag)},
})
info := w.structInfo(structType)
structPool := new(sync.Pool)
structZero := pointer(reflect.Zero(structType).Interface())
valueType := t.Elem()
valueOffset := structType.Field(1).Offset
mtype := pointer(t)
stype := pointer(structType)
vtype := pointer(valueType)
return func(b []byte, p unsafe.Pointer) (int, error) {
m := (*unsafe.Pointer)(p)
if *m == nil {
*m = MakeMap(mtype, 10)
}
if len(b) == 0 {
return 0, nil
}
s := pointer(structPool.Get())
if s == nil {
s = unsafe.Pointer(reflect.New(structType).Pointer())
}
_, nl, err := decodeVarint(b)
if err != nil {
return 0, err
}
n, err := info.decode(b[nl:], s)
if err == nil {
v := MapAssign(mtype, *m, s)
Assign(vtype, v, unsafe.Pointer(uintptr(s)+valueOffset))
}
Assign(stype, s, structZero)
structPool.Put(s)
return n + nl, err
}
}