// Copyright (c) 2015-2021 MinIO, Inc.//// This file is part of MinIO Object Storage stack//// This program is free software: you can redistribute it and/or modify// it under the terms of the GNU Affero General Public License as published by// the Free Software Foundation, either version 3 of the License, or// (at your option) any later version.//// This program is distributed in the hope that it will be useful// but WITHOUT ANY WARRANTY; without even the implied warranty of// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the// GNU Affero General Public License for more details.//// You should have received a copy of the GNU Affero General Public License// along with this program.  If not, see <http://www.gnu.org/licenses/>. package csv import (	"bytes"	"io") // recordTransform will convert records to always have newline records.type recordTransform struct {	reader io.Reader	// recordDelimiter can be up to 2 characters.	recordDelimiter []byte	oneByte         []byte	useOneByte      bool} func (rr *recordTransform) Read(p []byte) (n int, err error) {	if rr.useOneByte {		p[0] = rr.oneByte[0]		rr.useOneByte = false		n, err = rr.reader.Read(p[1:])		n++	} else {		n, err = rr.reader.Read(p)	} 	if err != nil {		return n, err	} 	// Do nothing if record-delimiter is already newline.	if string(rr.recordDelimiter) == "\n" {		return n, nil	} 	// Change record delimiters to newline.	if len(rr.recordDelimiter) == 1 {		for idx := 0; idx < len(p); {			i := bytes.Index(p[idx:], rr.recordDelimiter)			if i < 0 {				break			}			idx += i			p[idx] = '\n'		}		return n, nil	} 	// 2 characters...	for idx := 0; idx < len(p); {		i := bytes.Index(p[idx:], rr.recordDelimiter)		if i < 0 {			break		}		idx += i 		p[idx] = '\n'		p = append(p[:idx+1], p[idx+2:]...)		n--	} 	if p[n-1] != rr.recordDelimiter[0] {		return n, nil	} 	if _, err = rr.reader.Read(rr.oneByte); err != nil {		return n, err	} 	if rr.oneByte[0] == rr.recordDelimiter[1] {		p[n-1] = '\n'		return n, nil	} 	rr.useOneByte = true	return n, nil}