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40 lines
1.1 KiB
Go
40 lines
1.1 KiB
Go
// Copyright 2017 Docker, Inc.
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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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// https://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 digest
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import "hash"
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// Digester calculates the digest of written data. Writes should go directly
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// to the return value of Hash, while calling Digest will return the current
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// value of the digest.
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type Digester interface {
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Hash() hash.Hash // provides direct access to underlying hash instance.
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Digest() Digest
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}
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// digester provides a simple digester definition that embeds a hasher.
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type digester struct {
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alg Algorithm
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hash hash.Hash
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}
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func (d *digester) Hash() hash.Hash {
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return d.hash
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}
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func (d *digester) Digest() Digest {
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return NewDigest(d.alg, d.hash)
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}
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