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encoder.go
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encoder.go
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/*
* Copyright 2022 ByteDance Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package encoder
import (
`fmt`
`unsafe`
`github.com/cloudwego/frugal/internal/rt`
`github.com/cloudwego/frugal/internal/utils`
`github.com/cloudwego/frugal/iov`
)
type Encoder func (
buf unsafe.Pointer,
len int,
mem iov.BufferWriter,
p unsafe.Pointer,
rs *RuntimeState,
st int,
) (int, error)
var (
programCache = utils.CreateProgramCache()
)
func encode(vt *rt.GoType, buf unsafe.Pointer, len int, mem iov.BufferWriter, p unsafe.Pointer, rs *RuntimeState, st int) (int, error) {
if enc, err := resolve(vt); err != nil {
return -1, err
} else {
return enc(buf, len, mem, p, rs, st)
}
}
func resolve(vt *rt.GoType) (Encoder, error) {
if val := programCache.Get(vt); val != nil {
return val.(Encoder), nil
} else if ret, err := programCache.Compute(vt, compile); err == nil {
return ret.(Encoder), nil
} else {
return nil, err
}
}
func compile(vt *rt.GoType) (interface{}, error) {
if pp, err := CreateCompiler().CompileAndFree(vt.Pack()); err != nil {
return nil, err
} else {
return Link(Translate(pp)), nil
}
}
func EncodedSize(val interface{}) int {
if ret, err := EncodeObject(nil, nil, val); err != nil {
panic(fmt.Errorf("frugal: cannot measure encoded size: %w", err))
} else {
return ret
}
}
func EncodeObject(buf []byte, mem iov.BufferWriter, val interface{}) (ret int, err error) {
rst := newRuntimeState()
efv := rt.UnpackEface(val)
out := (*rt.GoSlice)(unsafe.Pointer(&buf))
/* check for indirect types */
if efv.Type.IsIndirect() {
ret, err = encode(efv.Type, out.Ptr, out.Len, mem, efv.Value, rst, 0)
} else {
ret, err = encode(efv.Type, out.Ptr, out.Len, mem, rt.NoEscape(unsafe.Pointer(&efv.Value)), rst, 0)
}
/* return the state into pool */
freeRuntimeState(rst)
return
}