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|
package bra
import (
"bytes"
"errors"
"fmt"
"io"
)
type readCloser struct {
rc io.ReadCloser
buf bytes.Buffer
n int
conv converter
}
var (
errAlreadyClosed = errors.New("bra: already closed")
errNeedOneReader = errors.New("bra: need exactly one reader")
)
func (rc *readCloser) Close() error {
if rc.rc == nil {
return errAlreadyClosed
}
if err := rc.rc.Close(); err != nil {
return fmt.Errorf("bra: error closing: %w", err)
}
rc.rc = nil
return nil
}
func (rc *readCloser) Read(p []byte) (int, error) {
if rc.rc == nil {
return 0, errAlreadyClosed
}
if _, err := io.CopyN(&rc.buf, rc.rc, int64(max(len(p), rc.conv.Size())-rc.buf.Len())); err != nil {
if !errors.Is(err, io.EOF) {
return 0, fmt.Errorf("bra: error buffering: %w", err)
}
if rc.buf.Len() < rc.conv.Size() {
rc.n = rc.buf.Len()
}
}
rc.n += rc.conv.Convert(rc.buf.Bytes()[rc.n:], false)
n, err := rc.buf.Read(p[:min(rc.n, len(p))])
if err != nil && !errors.Is(err, io.EOF) {
err = fmt.Errorf("bra: error reading: %w", err)
}
rc.n -= n
return n, err
}
func newReader(readers []io.ReadCloser, conv converter) (io.ReadCloser, error) {
if len(readers) != 1 {
return nil, errNeedOneReader
}
return &readCloser{
rc: readers[0],
conv: conv,
}, nil
}
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