93 lines
1.9 KiB
Go
93 lines
1.9 KiB
Go
/*
|
|
* MinIO Cloud Storage, (C) 2019 MinIO, Inc.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
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
|
|
}
|