mirror of
https://github.com/gravitational/teleport.git
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56 lines
1.6 KiB
Go
56 lines
1.6 KiB
Go
/*
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* Teleport
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* Copyright (C) 2023 Gravitational, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package utils
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// CaptureNBytesWriter is an io.Writer thats captures up to first n bytes
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// of the incoming data in memory, and then it ignores the rest of the incoming
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// data.
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type CaptureNBytesWriter struct {
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capture []byte
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maxRemaining int
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}
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// NewCaptureNBytesWriter creates a new CaptureNBytesWriter.
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func NewCaptureNBytesWriter(max int) *CaptureNBytesWriter {
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return &CaptureNBytesWriter{
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maxRemaining: max,
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}
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}
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// Write implements io.Writer.
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func (w *CaptureNBytesWriter) Write(p []byte) (int, error) {
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if w.maxRemaining > 0 {
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capture := p[:]
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if len(capture) > w.maxRemaining {
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capture = capture[:w.maxRemaining]
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}
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w.capture = append(w.capture, capture...)
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w.maxRemaining -= len(capture)
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}
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// Always pretend to be successful.
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return len(p), nil
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}
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// Bytes returns all captured bytes.
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func (w CaptureNBytesWriter) Bytes() []byte {
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return w.capture
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}
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