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//
// Copyright (c) SAS Institute 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 p11token
import (
"encoding/binary"
"fmt"
"unsafe"
)
var (
nativeOrder binary.ByteOrder
ulongSize int
)
func init() {
var i uint32 = 0x1
bs := (*[4]byte)(unsafe.Pointer(&i))
if bs[0] == 0 {
nativeOrder = binary.BigEndian
} else {
nativeOrder = binary.LittleEndian
}
var j uint
ulongSize = int(unsafe.Sizeof(j))
}
func putUlong(buf []byte, v uint) {
switch ulongSize {
case 4:
nativeOrder.PutUint32(buf, uint32(v))
case 8:
nativeOrder.PutUint64(buf, uint64(v))
default:
panic("can't determine native integer size")
}
}
func getUlong(value []byte) (uint, error) {
switch len(value) {
case 8:
return uint(nativeOrder.Uint64(value)), nil
case 4:
return uint(nativeOrder.Uint32(value)), nil
case 2:
return uint(nativeOrder.Uint16(value)), nil
case 1:
return uint(value[0]), nil
}
return 0, IntegerError{Raw: value}
}
type IntegerError struct {
Raw []byte
}
func (e IntegerError) Error() string {
return fmt.Sprintf("unable to parse value as unsigned integer: %x", e.Raw)
}
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