mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-21 05:42:18 +02:00
77 lines
1.8 KiB
Go
77 lines
1.8 KiB
Go
// Copyright 2017 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package convert
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import (
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"io"
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"github.com/hajimehoshi/ebiten/audio"
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)
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// A Seeker is io.Seeker and io.ReadSeekCloser.
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type Seeker struct {
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rc io.ReadCloser
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data []uint8
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pos int64
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eof bool
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}
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// Read is implementation of io.Reader's Read.
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func (s *Seeker) Read(buf []byte) (int, error) {
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for int64(len(s.data)) <= s.pos && !s.eof {
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buf := make([]uint8, 4096)
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n, err := s.rc.Read(buf)
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s.data = append(s.data, buf[:n]...)
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if err != nil {
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if err == io.EOF {
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s.eof = true
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break
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}
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return 0, err
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}
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}
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if int64(len(s.data)) <= s.pos && s.eof {
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return 0, io.EOF
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}
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n := copy(buf, s.data[s.pos:])
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s.pos += int64(n)
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return n, nil
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}
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// Seek is implementation of io.Seeker's Seek.
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func (s *Seeker) Seek(offset int64, whence int) (int64, error) {
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switch whence {
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case io.SeekStart:
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s.pos = offset
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case io.SeekCurrent:
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s.pos += offset
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case io.SeekEnd:
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panic("not implemented")
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}
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return s.pos, nil
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}
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// Read is implementation of io.Closer's Close.
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func (s *Seeker) Close() error {
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return s.rc.Close()
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}
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// NewSeeker creates audio.ReadSeekCloser from io.ReadSeeker.
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func NewSeeker(rc io.ReadCloser) audio.ReadSeekCloser {
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return &Seeker{
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rc: rc,
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}
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}
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