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runtime/js: impl CopyBytesToGo,CopyBytesToJS

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visualfc
2025-07-02 20:00:08 +08:00
parent 3d41514abd
commit 08077f03f1
3 changed files with 60 additions and 18 deletions
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55
runtime/js/js.go
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@@ -666,7 +666,13 @@ func (e *ValueError) Error() string {
// It panics if src is not a Uint8Array or Uint8ClampedArray.
// It returns the number of bytes copied, which will be the minimum of the lengths of src and dst.
func CopyBytesToGo(dst []byte, src Value) int {
return 0
if !(emval_instanceof(src, uint8Array) || emval_instanceof(src, uint8ClampedArray)) {
return 0
}
toCopy := src.Call("subarray", 0, len(dst))
view := emval_memory_view_uint8(uintptr(len(dst)), *(**byte)(unsafe.Pointer(&dst)))
view.Call("set", toCopy)
return toCopy.Length()
// n, ok := copyBytesToGo(dst, src.ref)
// runtime.KeepAlive(src)
// if !ok {
@@ -675,6 +681,23 @@ func CopyBytesToGo(dst []byte, src Value) int {
// return n
}
/*
// func copyBytesToGo(dst []byte, src ref) (int, bool)
"syscall/js.copyBytesToGo": (sp) => {
sp >>>= 0;
const dst = loadSlice(sp + 8);
const src = loadValue(sp + 32);
if (!(src instanceof Uint8Array || src instanceof Uint8ClampedArray)) {
this.mem.setUint8(sp + 48, 0);
return;
}
const toCopy = src.subarray(0, dst.length);
dst.set(toCopy);
setInt64(sp + 40, toCopy.length);
this.mem.setUint8(sp + 48, 1);
},
*/
// copyBytesToGo copies bytes from src to dst.
//
// Using go:noescape is safe because the dst byte slice is only used as a dst
@@ -688,7 +711,13 @@ func CopyBytesToGo(dst []byte, src Value) int {
// It panics if dst is not a Uint8Array or Uint8ClampedArray.
// It returns the number of bytes copied, which will be the minimum of the lengths of src and dst.
func CopyBytesToJS(dst Value, src []byte) int {
return 0
if !(emval_instanceof(dst, uint8Array) || emval_instanceof(dst, uint8ClampedArray)) {
return 0
}
view := emval_memory_view_uint8(uintptr(len(src)), *(**byte)(unsafe.Pointer(&src)))
toCopy := view.Call("subarray", 0, dst.Length())
dst.Call("set", toCopy)
return toCopy.Length()
// n, ok := copyBytesToJS(dst.ref, src)
// runtime.KeepAlive(dst)
// if !ok {
@@ -697,6 +726,28 @@ func CopyBytesToJS(dst Value, src []byte) int {
// return n
}
/*
// func copyBytesToJS(dst ref, src []byte) (int, bool)
"syscall/js.copyBytesToJS": (sp) => {
sp >>>= 0;
const dst = loadValue(sp + 8);
const src = loadSlice(sp + 16);
if (!(dst instanceof Uint8Array || dst instanceof Uint8ClampedArray)) {
this.mem.setUint8(sp + 48, 0);
return;
}
const toCopy = src.subarray(0, dst.length);
dst.set(toCopy);
setInt64(sp + 40, toCopy.length);
this.mem.setUint8(sp + 48, 1);
},
*/
var (
uint8Array = emval_get_global(c.Str("Uint8Array"))
uint8ClampedArray = emval_get_global(c.Str("Uint8ClampedArray"))
)
// copyBytesToJS copies bytes from src to dst.
//
// Using go:noescape is safe because the src byte slice is only used as a src