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struct_parser.go
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/
struct_parser.go
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// Copyright 2016-2019 the u-root Authors. All rights reserved
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package smbios
import (
"fmt"
"reflect"
"strconv"
"strings"
)
type fieldParser interface {
ParseField(t *Table, off int) (int, error)
}
var (
fieldTagKey = "smbios" // Tag key for annotations.
fieldParserInterfaceType = reflect.TypeOf((*fieldParser)(nil)).Elem()
)
func parseStruct(t *Table, off int, complete bool, sp interface{}) (int, error) {
var err error
var ok bool
var sv reflect.Value
if sv, ok = sp.(reflect.Value); !ok {
sv = reflect.Indirect(reflect.ValueOf(sp)) // must be a pointer to struct then, dereference it
}
svtn := sv.Type().Name()
// fmt.Printf("t %s\n", svtn)
i := 0
for ; i < sv.NumField() && off < t.Len(); i++ {
f := sv.Type().Field(i)
fv := sv.Field(i)
ft := fv.Type()
tags := f.Tag.Get(fieldTagKey)
// fmt.Printf("XX %02Xh f %s t %s k %s %s\n", off, f.Name, f.Type.Name(), fv.Kind(), tags)
// Check tags first
ignore := false
for _, tag := range strings.Split(tags, ",") {
tp := strings.Split(tag, "=")
switch tp[0] {
case "-":
ignore = true
case "skip":
numBytes, _ := strconv.Atoi(tp[1])
off += numBytes
}
}
if ignore {
continue
}
var verr error
switch fv.Kind() {
case reflect.Uint8:
v, err := t.GetByteAt(off)
fv.SetUint(uint64(v))
verr = err
off++
case reflect.Uint16:
v, err := t.GetWordAt(off)
fv.SetUint(uint64(v))
verr = err
off += 2
case reflect.Uint32:
v, err := t.GetDWordAt(off)
fv.SetUint(uint64(v))
verr = err
off += 4
case reflect.Uint64:
v, err := t.GetQWordAt(off)
fv.SetUint(v)
verr = err
off += 8
case reflect.String:
v, _ := t.GetStringAt(off)
fv.SetString(v)
off++
default:
if reflect.PtrTo(ft).Implements(fieldParserInterfaceType) {
off, err = fv.Addr().Interface().(fieldParser).ParseField(t, off)
if err != nil {
return off, err
}
break
}
// If it's a struct, just invoke parseStruct recursively.
if fv.Kind() == reflect.Struct {
off, err = parseStruct(t, off, true /* complete */, fv)
if err != nil {
return off, err
}
break
}
return off, fmt.Errorf("%s.%s: unsupported type %s", svtn, f.Name, fv.Kind())
}
if verr != nil {
return off, fmt.Errorf("failed to parse %s.%s: %s", svtn, f.Name, verr)
}
}
if complete && i < sv.NumField() {
return off, fmt.Errorf("%s incomplete, got %d of %d fields", svtn, i, sv.NumField())
}
return off, nil
}