mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2025-01-12 12:08:58 +01:00
77 lines
1.8 KiB
Go
77 lines
1.8 KiB
Go
// Copyright 2017 The Ebiten Authors
|
|
//
|
|
// 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 convert
|
|
|
|
import (
|
|
"io"
|
|
|
|
"github.com/hajimehoshi/ebiten/audio"
|
|
)
|
|
|
|
// A Seeker is io.Seeker and io.ReadSeekCloser.
|
|
type Seeker struct {
|
|
rc io.ReadCloser
|
|
data []uint8
|
|
pos int64
|
|
eof bool
|
|
}
|
|
|
|
// Read is implementation of io.Reader's Read.
|
|
func (s *Seeker) Read(buf []byte) (int, error) {
|
|
for int64(len(s.data)) <= s.pos && !s.eof {
|
|
buf := make([]uint8, 4096)
|
|
n, err := s.rc.Read(buf)
|
|
s.data = append(s.data, buf[:n]...)
|
|
if err != nil {
|
|
if err == io.EOF {
|
|
s.eof = true
|
|
break
|
|
}
|
|
return 0, err
|
|
}
|
|
}
|
|
if int64(len(s.data)) <= s.pos && s.eof {
|
|
return 0, io.EOF
|
|
}
|
|
n := copy(buf, s.data[s.pos:])
|
|
s.pos += int64(n)
|
|
return n, nil
|
|
}
|
|
|
|
// Seek is implementation of io.Seeker's Seek.
|
|
func (s *Seeker) Seek(offset int64, whence int) (int64, error) {
|
|
switch whence {
|
|
case io.SeekStart:
|
|
s.pos = offset
|
|
case io.SeekCurrent:
|
|
s.pos += offset
|
|
case io.SeekEnd:
|
|
panic("not implemented")
|
|
}
|
|
return s.pos, nil
|
|
}
|
|
|
|
// Read is implementation of io.Closer's Close.
|
|
func (s *Seeker) Close() error {
|
|
return s.rc.Close()
|
|
}
|
|
|
|
// NewSeeker creates audio.ReadSeekCloser from io.ReadSeeker.
|
|
func NewSeeker(rc io.ReadCloser) audio.ReadSeekCloser {
|
|
return &Seeker{
|
|
rc: rc,
|
|
}
|
|
}
|