wasi-module-sdk-go/mem/unmanaged.go

package mem

// #include <stdlib.h>
import "C"

import "unsafe"

func DataToManagedPtr(data []byte) (ptr uint32, size uint32) {
	uptr := unsafe.Pointer(unsafe.SliceData(data))
	return uint32(uintptr(uptr)), uint32(len(data))
}

func DataToUnmanagedPtr(data []byte) (uint32, uint32) {
	size := C.ulong(len(data))
	ptr := unsafe.Pointer(C.malloc(size))
	copy(unsafe.Slice((*byte)(ptr), len(data)), data)
	return uint32(uintptr(ptr)), uint32(size)
}

func DataFromPtr(ptr, size uint32) []byte {
	p := unsafe.Pointer(uintptr(ptr))
	return unsafe.Slice((*byte)(p), int(size))
}

func PtrToData(ptr uint32, size uint32) []byte {
	return unsafe.Slice((*byte)(unsafe.Pointer(uintptr(ptr))), size)
}

func UnifyPtrSize(ptr, size uint32) uint64 {
	return (uint64(ptr) << uint64(32)) | uint64(size)
}

func UnifiedPtrToSizePtr(uint64ptr uint64) (ptr uint32, size uint32) {
	return uint32(uint64ptr >> 32), uint32(uint64ptr)
}