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readall.go
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readall.go
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// Copyright (c) 2022 Arthur Skowronek <0x5a17ed@tuta.io> and contributors
//
// 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
//
// <https://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 efivario
import (
"errors"
"github.com/ecks/uefi/efi/efiguid"
)
func ReadAll(c Context, name string, guid efiguid.GUID) (
attrs Attributes,
out []byte,
err error,
) {
hint, err := c.GetSizeHint(name, guid)
if err != nil || hint < 0 {
hint = 8
}
out = make([]byte, hint)
for i := int(hint) << 1; i <= 4096; i = i << 1 {
var n int
attrs, n, err = c.Get(name, guid, out)
if err != nil {
if errors.Is(err, ErrInsufficientSpace) {
out = append(make([]byte, i-len(out)), out...)
continue
}
return
}
out = out[:n]
return
}
return
}