60 lines
2.1 KiB
Go
60 lines
2.1 KiB
Go
//go:build tinygo
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package challenge
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// #include <stdlib.h>
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import "C"
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import (
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"unsafe"
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)
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// PtrToBytes returns a byte slice from WebAssembly compatible numeric types
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// representing its pointer and length.
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func PtrToBytes(ptr uint32, size uint32) []byte {
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return unsafe.Slice((*byte)(unsafe.Pointer(uintptr(ptr))), size)
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}
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// BytesToPtr returns a pointer and size pair for the given byte slice in a way
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// compatible with WebAssembly numeric types.
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// The returned pointer aliases the slice hence the slice must be kept alive
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// until ptr is no longer needed.
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func BytesToPtr(s []byte) (uint32, uint32) {
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ptr := unsafe.Pointer(unsafe.SliceData(s))
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return uint32(uintptr(ptr)), uint32(len(s))
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}
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// BytesToLeakedPtr returns a pointer and size pair for the given byte slice in a way
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// compatible with WebAssembly numeric types.
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// The pointer is not automatically managed by TinyGo hence it must be freed by the host.
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func BytesToLeakedPtr(s []byte) (uint32, uint32) {
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size := C.ulong(len(s))
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ptr := unsafe.Pointer(C.malloc(size))
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copy(unsafe.Slice((*byte)(ptr), size), s)
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return uint32(uintptr(ptr)), uint32(size)
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}
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// PtrToString returns a string from WebAssembly compatible numeric types
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// representing its pointer and length.
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func PtrToString(ptr uint32, size uint32) string {
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return unsafe.String((*byte)(unsafe.Pointer(uintptr(ptr))), size)
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}
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// StringToPtr returns a pointer and size pair for the given string in a way
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// compatible with WebAssembly numeric types.
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// The returned pointer aliases the string hence the string must be kept alive
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// until ptr is no longer needed.
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func StringToPtr(s string) (uint32, uint32) {
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ptr := unsafe.Pointer(unsafe.StringData(s))
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return uint32(uintptr(ptr)), uint32(len(s))
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}
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// StringToLeakedPtr returns a pointer and size pair for the given string in a way
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// compatible with WebAssembly numeric types.
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// The pointer is not automatically managed by TinyGo hence it must be freed by the host.
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func StringToLeakedPtr(s string) (uint32, uint32) {
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size := C.ulong(len(s))
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ptr := unsafe.Pointer(C.malloc(size))
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copy(unsafe.Slice((*byte)(ptr), size), s)
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return uint32(uintptr(ptr)), uint32(size)
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}
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