82 lines
2.0 KiB
Go
82 lines
2.0 KiB
Go
// Copyright 2021 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package packages
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import (
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"io"
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"code.gitea.io/gitea/modules/util/filebuffer"
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)
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// HashedSizeReader provide methods to read, sum hashes and a Size method
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type HashedSizeReader interface {
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io.Reader
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HashSummer
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Size() int64
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}
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// HashedBuffer is buffer which calculates multiple checksums
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type HashedBuffer struct {
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*filebuffer.FileBackedBuffer
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hash *MultiHasher
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combinedWriter io.Writer
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}
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const DefaultMemorySize = 32 * 1024 * 1024
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// NewHashedBuffer creates a hashed buffer with the default memory size
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func NewHashedBuffer() (*HashedBuffer, error) {
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return NewHashedBufferWithSize(DefaultMemorySize)
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}
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// NewHashedBufferWithSize creates a hashed buffer with a specific memory size
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func NewHashedBufferWithSize(maxMemorySize int) (*HashedBuffer, error) {
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b, err := filebuffer.New(maxMemorySize)
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if err != nil {
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return nil, err
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}
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hash := NewMultiHasher()
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combinedWriter := io.MultiWriter(b, hash)
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return &HashedBuffer{
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b,
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hash,
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combinedWriter,
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}, nil
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}
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// CreateHashedBufferFromReader creates a hashed buffer with the default memory size and copies the provided reader data into it.
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func CreateHashedBufferFromReader(r io.Reader) (*HashedBuffer, error) {
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return CreateHashedBufferFromReaderWithSize(r, DefaultMemorySize)
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}
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// CreateHashedBufferFromReaderWithSize creates a hashed buffer and copies the provided reader data into it.
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func CreateHashedBufferFromReaderWithSize(r io.Reader, maxMemorySize int) (*HashedBuffer, error) {
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b, err := NewHashedBufferWithSize(maxMemorySize)
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if err != nil {
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return nil, err
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}
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_, err = io.Copy(b, r)
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if err != nil {
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return nil, err
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}
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return b, nil
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}
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// Write implements io.Writer
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func (b *HashedBuffer) Write(p []byte) (int, error) {
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return b.combinedWriter.Write(p)
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}
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// Sums gets the MD5, SHA1, SHA256 and SHA512 checksums of the data
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func (b *HashedBuffer) Sums() (hashMD5, hashSHA1, hashSHA256, hashSHA512 []byte) {
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return b.hash.Sums()
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}
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