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61 lines
1.8 KiB
Go
61 lines
1.8 KiB
Go
/*
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Maddy Mail Server - Composable all-in-one email server.
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Copyright © 2019-2020 Max Mazurov <fox.cpp@disroot.org>, Maddy Mail Server contributors
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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 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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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 General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package buffer
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import (
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"bytes"
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)
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// BytesReader is a wrapper for bytes.Reader that stores the original []byte
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// value and allows to retrieve it.
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//
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// It is meant for passing to libraries that expect a io.Reader
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// but apply certain optimizations when the Reader implements
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// Bytes() interface.
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type BytesReader struct {
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*bytes.Reader
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value []byte
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}
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// Bytes returns the unread portion of underlying slice used to construct
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// BytesReader.
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func (br BytesReader) Bytes() []byte {
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return br.value[int(br.Size())-br.Len():]
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}
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// Copy returns the BytesReader reading from the same slice as br at the same
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// position.
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func (br BytesReader) Copy() BytesReader {
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return NewBytesReader(br.Bytes())
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}
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// Close is a dummy method for implementation of io.Closer so BytesReader can
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// be used in MemoryBuffer directly.
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func (br BytesReader) Close() error {
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return nil
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}
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func NewBytesReader(b []byte) BytesReader {
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// BytesReader and not *BytesReader because BytesReader already wraps two
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// pointers and double indirection would be pointless.
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return BytesReader{
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Reader: bytes.NewReader(b),
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value: b,
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}
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}
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