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https://github.com/go-i2p/go-i2p-bt.git
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37 lines
1.1 KiB
Go
37 lines
1.1 KiB
Go
// Copyright 2020 xgfone, 2023 idk
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package utils
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import "io"
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// CopyNBuffer is the same as io.CopyN, but uses the given buf as the buffer.
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//
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// If buf is nil or empty, it will make a new one with 2048.
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func CopyNBuffer(dst io.Writer, src io.Reader, n int64, buf []byte) (written int64, err error) {
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if len(buf) == 0 {
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buf = make([]byte, 2048)
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}
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written, err = io.CopyBuffer(dst, io.LimitReader(src, n), buf)
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if written == n {
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return n, nil
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} else if written < n && err == nil {
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// src stopped early; must have been EOF.
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err = io.EOF
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}
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return
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}
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