61 lines
2.5 KiB
Go
61 lines
2.5 KiB
Go
// Copyright 2019 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package marshal defines the Marshallable interface for
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// serialize/deserializing go data structures to/from memory, according to the
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// Linux ABI.
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//
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// Implementations of this interface are typically automatically generated by
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// tools/go_marshal. See the go_marshal README for details.
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package marshal
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// Marshallable represents a type that can be marshalled to and from memory.
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type Marshallable interface {
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// SizeBytes is the size of the memory representation of a type in
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// marshalled form.
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SizeBytes() int
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// MarshalBytes serializes a copy of a type to dst. dst must be at least
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// SizeBytes() long.
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MarshalBytes(dst []byte)
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// UnmarshalBytes deserializes a type from src. src must be at least
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// SizeBytes() long.
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UnmarshalBytes(src []byte)
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// Packed returns true if the marshalled size of the type is the same as the
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// size it occupies in memory. This happens when the type has no fields
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// starting at unaligned addresses (should always be true by default for ABI
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// structs, verified by automatically generated tests when using
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// go_marshal), and has no fields marked `marshal:"unaligned"`.
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Packed() bool
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// MarshalUnsafe serializes a type by bulk copying its in-memory
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// representation to the dst buffer. This is only safe to do when the type
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// has no implicit padding, see Marshallable.Packed. When Packed would
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// return false, MarshalUnsafe should fall back to the safer but slower
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// MarshalBytes.
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MarshalUnsafe(dst []byte)
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// UnmarshalUnsafe deserializes a type directly to the underlying memory
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// allocated for the object by the runtime.
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//
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// This allows much faster unmarshalling of types which have no implicit
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// padding, see Marshallable.Packed. When Packed would return false,
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// UnmarshalUnsafe should fall back to the safer but slower unmarshal
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// mechanism implemented in UnmarshalBytes (usually by calling
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// UnmarshalBytes directly).
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UnmarshalUnsafe(src []byte)
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}
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