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See #8222 for context. ## git.Blob.NewTruncatedReader This introduce a new `NewTruncatedReader` method to return a blob-reader which silently truncates when the limit is reached (io.EOF will be returned). Since the actual size is also returned `GetBlobContent` can pre-allocate a `[]byte` of the full-size (min of the asked size and the actual size) and call `io.ReadFull(rc, buf)` (instead of `util.ReadWithLimit(dataRc, int(limit))` which is convoluted and not used anywhere else). ### Tests - I added test coverage for Go changes... - [x] in their respective `*_test.go` for unit tests. ### Documentation - [x] I did not document these changes and I do not expect someone else to do it. ### Release notes - [x] I do not want this change to show in the release notes. Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/8223 Reviewed-by: Lucas <sclu1034@noreply.codeberg.org> Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org> Co-authored-by: oliverpool <git@olivier.pfad.fr> Co-committed-by: oliverpool <git@olivier.pfad.fr>
41 lines
923 B
Go
41 lines
923 B
Go
// Copyright 2021 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package util
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import (
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"errors"
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"io"
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)
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// ReadAtMost reads at most len(buf) bytes from r into buf.
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// It returns the number of bytes copied. n is only less than len(buf) if r provides fewer bytes.
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// If EOF or ErrUnexpectedEOF occurs while reading, err will be nil.
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func ReadAtMost(r io.Reader, buf []byte) (n int, err error) {
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n, err = io.ReadFull(r, buf)
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if err == io.EOF || err == io.ErrUnexpectedEOF {
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err = nil
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}
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return n, err
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}
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// ErrNotEmpty is an error reported when there is a non-empty reader
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var ErrNotEmpty = errors.New("not-empty")
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// IsEmptyReader reads a reader and ensures it is empty
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func IsEmptyReader(r io.Reader) (err error) {
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var buf [1]byte
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for {
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n, err := r.Read(buf[:])
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if err != nil {
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if err == io.EOF {
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return nil
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}
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return err
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}
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if n > 0 {
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return ErrNotEmpty
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}
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}
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}
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