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jsutil: Refactoring

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This commit is contained in:
Hajime Hoshi 2019-06-17 10:48:36 +09:00
parent ab61a2d23c
commit 4396978d4b
1 changed files with 20 additions and 18 deletions
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38
internal/jsutil/go113_js.go
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@ -34,56 +34,66 @@ func ArrayBufferToSlice(value js.Value) []byte {
return Uint8ArrayToSlice(js.Global().Get("Uint8Array").New(value))
}
func sliceToByteSlice(s interface{}) []byte {
func sliceToByteSlice(s interface{}) (bs []byte) {
switch s := s.(type) {
case []int8:
h := (*reflect.SliceHeader)(unsafe.Pointer(&s))
return *(*[]byte)(unsafe.Pointer(h))
bs = *(*[]byte)(unsafe.Pointer(h))
runtime.KeepAlive(s)
case []int16:
h := (*reflect.SliceHeader)(unsafe.Pointer(&s))
h.Len *= 2
h.Cap *= 2
return *(*[]byte)(unsafe.Pointer(h))
bs = *(*[]byte)(unsafe.Pointer(h))
runtime.KeepAlive(s)
case []int32:
h := (*reflect.SliceHeader)(unsafe.Pointer(&s))
h.Len *= 4
h.Cap *= 4
return *(*[]byte)(unsafe.Pointer(h))
bs = *(*[]byte)(unsafe.Pointer(h))
runtime.KeepAlive(s)
case []int64:
h := (*reflect.SliceHeader)(unsafe.Pointer(&s))
h.Len *= 8
h.Cap *= 8
return *(*[]byte)(unsafe.Pointer(h))
bs = *(*[]byte)(unsafe.Pointer(h))
runtime.KeepAlive(s)
case []uint8:
return s
case []uint16:
h := (*reflect.SliceHeader)(unsafe.Pointer(&s))
h.Len *= 2
h.Cap *= 2
return *(*[]byte)(unsafe.Pointer(h))
bs = *(*[]byte)(unsafe.Pointer(h))
runtime.KeepAlive(s)
case []uint32:
h := (*reflect.SliceHeader)(unsafe.Pointer(&s))
h.Len *= 4
h.Cap *= 4
return *(*[]byte)(unsafe.Pointer(h))
bs = *(*[]byte)(unsafe.Pointer(h))
runtime.KeepAlive(s)
case []uint64:
h := (*reflect.SliceHeader)(unsafe.Pointer(&s))
h.Len *= 8
h.Cap *= 8
return *(*[]byte)(unsafe.Pointer(h))
bs = *(*[]byte)(unsafe.Pointer(h))
runtime.KeepAlive(s)
case []float32:
h := (*reflect.SliceHeader)(unsafe.Pointer(&s))
h.Len *= 4
h.Cap *= 4
return *(*[]byte)(unsafe.Pointer(h))
bs = *(*[]byte)(unsafe.Pointer(h))
runtime.KeepAlive(s)
case []float64:
h := (*reflect.SliceHeader)(unsafe.Pointer(&s))
h.Len *= 8
h.Cap *= 8
return *(*[]byte)(unsafe.Pointer(h))
bs = *(*[]byte)(unsafe.Pointer(h))
runtime.KeepAlive(s)
default:
panic(fmt.Sprintf("jsutil: unexpected value at sliceToBytesSlice: %T", s))
}
return
}
func SliceToTypedArray(s interface{}) (js.Value, func()) {
@ -91,48 +101,40 @@ func SliceToTypedArray(s interface{}) (js.Value, func()) {
case []int8:
a := js.Global().Get("Uint8Array").New(len(s))
js.CopyBytesToJS(a, sliceToByteSlice(s))
runtime.KeepAlive(s)
buf := a.Get("buffer")
return js.Global().Get("Int8Array").New(buf, a.Get("byteOffset"), a.Get("byteLength")), func() {}
case []int16:
a := js.Global().Get("Uint8Array").New(len(s) * 2)
js.CopyBytesToJS(a, sliceToByteSlice(s))
runtime.KeepAlive(s)
buf := a.Get("buffer")
return js.Global().Get("Int16Array").New(buf, a.Get("byteOffset"), a.Get("byteLength").Int()/2), func() {}
case []int32:
a := js.Global().Get("Uint8Array").New(len(s) * 4)
js.CopyBytesToJS(a, sliceToByteSlice(s))
runtime.KeepAlive(s)
buf := a.Get("buffer")
return js.Global().Get("Int32Array").New(buf, a.Get("byteOffset"), a.Get("byteLength").Int()/4), func() {}
case []uint8:
a := js.Global().Get("Uint8Array").New(len(s))
js.CopyBytesToJS(a, s)
runtime.KeepAlive(s)
return a, func() {}
case []uint16:
a := js.Global().Get("Uint8Array").New(len(s) * 2)
js.CopyBytesToJS(a, sliceToByteSlice(s))
runtime.KeepAlive(s)
buf := a.Get("buffer")
return js.Global().Get("Uint16Array").New(buf, a.Get("byteOffset"), a.Get("byteLength").Int()/2), func() {}
case []uint32:
a := js.Global().Get("Uint8Array").New(len(s) * 4)
js.CopyBytesToJS(a, sliceToByteSlice(s))
runtime.KeepAlive(s)
buf := a.Get("buffer")
return js.Global().Get("Uint32Array").New(buf, a.Get("byteOffset"), a.Get("byteLength").Int()/4), func() {}
case []float32:
a := js.Global().Get("Uint8Array").New(len(s) * 4)
js.CopyBytesToJS(a, sliceToByteSlice(s))
runtime.KeepAlive(s)
buf := a.Get("buffer")
return js.Global().Get("Float32Array").New(buf, a.Get("byteOffset"), a.Get("byteLength").Int()/4), func() {}
case []float64:
a := js.Global().Get("Uint8Array").New(len(s) * 8)
js.CopyBytesToJS(a, sliceToByteSlice(s))
runtime.KeepAlive(s)
buf := a.Get("buffer")
return js.Global().Get("Float64Array").New(buf, a.Get("byteOffset"), a.Get("byteLength").Int()/8), func() {}
default: