ebiten/ebitenutil/file_js.go

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// Copyright 2015 Hajime Hoshi
//
// 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.
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// +build js
package ebitenutil
import (
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"bytes"
"errors"
"fmt"
"syscall/js"
)
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type file struct {
*bytes.Reader
}
func (f *file) Close() error {
return nil
}
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{})
req := js.Global().Get("XMLHttpRequest").New()
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req.Call("open", "GET", path, true)
req.Set("responseType", "arraybuffer")
loadf := js.FuncOf(func(this js.Value, args []js.Value) interface{} {
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defer close(ch)
status := req.Get("status").Int()
if 200 <= status && status < 400 {
content = req.Get("response")
return nil
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}
err = errors.New(fmt.Sprintf("http error: %d", status))
return nil
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})
defer loadf.Release()
req.Call("addEventListener", "load", loadf)
errorf := js.FuncOf(func(this js.Value, args []js.Value) interface{} {
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defer close(ch)
err = errors.New(fmt.Sprintf("XMLHttpRequest error: %s", req.Get("statusText").String()))
return nil
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})
req.Call("addEventListener", "error", errorf)
defer errorf.Release()
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req.Call("send")
<-ch
if err != nil {
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return nil, err
}
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uint8contentWrapper := js.Global().Get("Uint8Array").New(content)
data := make([]byte, uint8contentWrapper.Get("byteLength").Int())
arr := js.TypedArrayOf(data)
arr.Call("set", uint8contentWrapper)
arr.Release()
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f := &file{bytes.NewReader(data)}
return f, nil
}