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size.go
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size.go
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/*
Copyright 2020 Takahiro Yamashita
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 endian
import (
"reflect"
)
func sizeOfValueRecursive(c *int, v reflect.Value, structtag bool) {
switch v.Kind() {
case reflect.Struct:
if structtag {
for i := 0; i < v.Type().NumField(); i++ {
f := v.Type().Field(i)
cnf := parseStructTag(f.Tag)
if cnf != nil && cnf.ignore {
continue
}
sizeOfValueRecursive(c, v.Field(i), structtag)
}
} else {
for i := 0; i < v.NumField(); i++ {
sizeOfValueRecursive(c, v.Field(i), structtag)
}
}
case reflect.Array, reflect.Slice:
if v.Len() == 0 {
return
}
var elemSize int
sizeOfValueRecursive(&elemSize, v.Index(0), structtag)
*c += (elemSize * v.Len())
default:
/* other types */
*c += v.Type().Bits() / 8
}
}
func sizeOfValue(v reflect.Value, structtag bool) (ret int) {
sizeOfValueRecursive(&ret, v, structtag)
return ret
}