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gitea/modules/util/io.go
yp05327 22a39bb961
Fix profile render when the README.md size is larger than 1024 bytes (#25131)
Fixes https://github.com/go-gitea/gitea/issues/25094

`GetBlobContent` will only get the first 1024 bytes, if the README.md
size is larger than 1024 bytes,
We can not render the rest of them.
After this fix, we should provide the limited size to read when call
`GetBlobContent`.

After:

![image](https://github.com/go-gitea/gitea/assets/18380374/22a42936-4cf8-40b4-a5c7-e384082beb0d)

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
2023-06-13 09:02:25 +00:00

78 lines
1.8 KiB
Go

// Copyright 2021 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package util
import (
"bytes"
"errors"
"io"
)
// ReadAtMost reads at most len(buf) bytes from r into buf.
// It returns the number of bytes copied. n is only less than len(buf) if r provides fewer bytes.
// If EOF or ErrUnexpectedEOF occurs while reading, err will be nil.
func ReadAtMost(r io.Reader, buf []byte) (n int, err error) {
n, err = io.ReadFull(r, buf)
if err == io.EOF || err == io.ErrUnexpectedEOF {
err = nil
}
return n, err
}
// ReadWithLimit reads at most "limit" bytes from r into buf.
// If EOF or ErrUnexpectedEOF occurs while reading, err will be nil.
func ReadWithLimit(r io.Reader, n int) (buf []byte, err error) {
return readWithLimit(r, 1024, n)
}
func readWithLimit(r io.Reader, batch, limit int) ([]byte, error) {
if limit <= batch {
buf := make([]byte, limit)
n, err := ReadAtMost(r, buf)
if err != nil {
return nil, err
}
return buf[:n], nil
}
res := bytes.NewBuffer(make([]byte, 0, batch))
bufFix := make([]byte, batch)
eof := false
for res.Len() < limit && !eof {
bufTmp := bufFix
if res.Len()+batch > limit {
bufTmp = bufFix[:limit-res.Len()]
}
n, err := io.ReadFull(r, bufTmp)
if err == io.EOF || err == io.ErrUnexpectedEOF {
eof = true
} else if err != nil {
return nil, err
}
if _, err = res.Write(bufTmp[:n]); err != nil {
return nil, err
}
}
return res.Bytes(), nil
}
// ErrNotEmpty is an error reported when there is a non-empty reader
var ErrNotEmpty = errors.New("not-empty")
// IsEmptyReader reads a reader and ensures it is empty
func IsEmptyReader(r io.Reader) (err error) {
var buf [1]byte
for {
n, err := r.Read(buf[:])
if err != nil {
if err == io.EOF {
return nil
}
return err
}
if n > 0 {
return ErrNotEmpty
}
}
}