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digester.go

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  • digester.go 1.19 KiB
    // Copyright 2019, 2020 OCI Contributors
    // Copyright 2017 Docker, 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
    //
    //     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 digest
    
    import "hash"
    
    // Digester calculates the digest of written data. Writes should go directly
    // to the return value of Hash, while calling Digest will return the current
    // value of the digest.
    type Digester interface {
    	Hash() hash.Hash // provides direct access to underlying hash instance.
    	Digest() Digest
    }
    
    // digester provides a simple digester definition that embeds a hasher.
    type digester struct {
    	alg  Algorithm
    	hash hash.Hash
    }
    
    func (d *digester) Hash() hash.Hash {
    	return d.hash
    }
    
    func (d *digester) Digest() Digest {
    	return NewDigest(d.alg, d.hash)
    }