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https://github.com/hajimehoshi/ebiten.git
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2938afd82a
Fixes #673 * Change to use `js.NewCallback` * Use `uint8contentWrapper := js.Global().Get("Uint8Array").New(content)`, without this all the bytes in `data` stays zeroed. (TypedArray cannot use `set` on an ArrayBuffer)
73 lines
1.9 KiB
Go
73 lines
1.9 KiB
Go
// Copyright 2015 Hajime Hoshi
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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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// +build js
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package ebitenutil
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import (
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"bytes"
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"errors"
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"fmt"
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"github.com/gopherjs/gopherwasm/js"
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)
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type file struct {
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*bytes.Reader
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}
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func (f *file) Close() error {
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return nil
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}
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func OpenFile(path string) (ReadSeekCloser, error) {
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var err error
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var content js.Value
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ch := make(chan struct{})
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req := js.Global().Get("XMLHttpRequest").New()
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req.Call("open", "GET", path, true)
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req.Set("responseType", "arraybuffer")
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loadCallback := js.NewCallback(func([]js.Value) {
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defer close(ch)
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status := req.Get("status").Int()
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if 200 <= status && status < 400 {
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content = req.Get("response")
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return
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}
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err = errors.New(fmt.Sprintf("http error: %d", status))
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})
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defer loadCallback.Release()
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req.Call("addEventListener", "load", loadCallback)
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errorCallback := js.NewCallback(func([]js.Value) {
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defer close(ch)
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err = errors.New(fmt.Sprintf("XMLHttpRequest error: %s", req.Get("statusText").String()))
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})
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req.Call("addEventListener", "error", errorCallback)
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defer errorCallback.Release()
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req.Call("send")
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<-ch
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if err != nil {
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return nil, err
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}
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uint8contentWrapper := js.Global().Get("Uint8Array").New(content)
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data := make([]byte, uint8contentWrapper.Get("byteLength").Int())
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arr := js.TypedArrayOf(data)
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arr.Call("set", uint8contentWrapper)
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arr.Release()
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f := &file{bytes.NewReader(data)}
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return f, nil
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}
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