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gitea/modules/packages/hashed_buffer.go

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1.5 KiB
Go

// Copyright 2021 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package packages
import (
"io"
"code.gitea.io/gitea/modules/util/filebuffer"
)
// HashedSizeReader provide methods to read, sum hashes and a Size method
type HashedSizeReader interface {
io.Reader
HashSummer
Size() int64
}
// HashedBuffer is buffer which calculates multiple checksums
type HashedBuffer struct {
*filebuffer.FileBackedBuffer
hash *MultiHasher
combinedWriter io.Writer
}
// NewHashedBuffer creates a hashed buffer with a specific maximum memory size
func NewHashedBuffer(maxMemorySize int) (*HashedBuffer, error) {
b, err := filebuffer.New(maxMemorySize)
if err != nil {
return nil, err
}
hash := NewMultiHasher()
combinedWriter := io.MultiWriter(b, hash)
return &HashedBuffer{
b,
hash,
combinedWriter,
}, nil
}
// CreateHashedBufferFromReader creates a hashed buffer and copies the provided reader data into it.
func CreateHashedBufferFromReader(r io.Reader, maxMemorySize int) (*HashedBuffer, error) {
b, err := NewHashedBuffer(maxMemorySize)
if err != nil {
return nil, err
}
_, err = io.Copy(b, r)
if err != nil {
return nil, err
}
return b, nil
}
// Write implements io.Writer
func (b *HashedBuffer) Write(p []byte) (int, error) {
return b.combinedWriter.Write(p)
}
// Sums gets the MD5, SHA1, SHA256 and SHA512 checksums of the data
func (b *HashedBuffer) Sums() (hashMD5, hashSHA1, hashSHA256, hashSHA512 []byte) {
return b.hash.Sums()
}