92 строки
2.2 KiB
Plaintext
92 строки
2.2 KiB
Plaintext
// Copyright 2016 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package main
|
|
|
|
// Go support functions for Objective-C. Note that this
|
|
// file is copied into and compiled with the generated
|
|
// bindings.
|
|
|
|
/*
|
|
#cgo CFLAGS: -x objective-c -fobjc-arc -fmodules -fblocks -Werror
|
|
#cgo LDFLAGS: -framework Foundation
|
|
|
|
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
#include "seq.h"
|
|
*/
|
|
import "C"
|
|
|
|
import (
|
|
"unsafe"
|
|
|
|
"golang.org/x/mobile/bind/seq"
|
|
)
|
|
|
|
// DestroyRef is called by Objective-C to inform Go it is done with a reference.
|
|
//export DestroyRef
|
|
func DestroyRef(refnum C.int32_t) {
|
|
seq.Delete(int32(refnum))
|
|
}
|
|
|
|
// encodeString copies a Go string and returns it as a nstring.
|
|
func encodeString(s string) C.nstring {
|
|
n := C.int(len(s))
|
|
if n == 0 {
|
|
return C.nstring{}
|
|
}
|
|
ptr := C.malloc(C.size_t(n))
|
|
if ptr == nil {
|
|
panic("encodeString: malloc failed")
|
|
}
|
|
copy((*[1<<31 - 1]byte)(ptr)[:n], s)
|
|
return C.nstring{ptr: ptr, len: n}
|
|
}
|
|
|
|
// decodeString converts a nstring to a Go string. The
|
|
// data in str is freed after use.
|
|
func decodeString(str C.nstring) string {
|
|
if str.ptr == nil {
|
|
return ""
|
|
}
|
|
s := C.GoStringN((*C.char)(str.ptr), str.len)
|
|
C.free(str.ptr)
|
|
return s
|
|
}
|
|
|
|
// fromSlice converts a slice to a nbyteslice.
|
|
// If cpy is set, a malloc'ed copy of the data is returned.
|
|
func fromSlice(s []byte, cpy bool) C.nbyteslice {
|
|
if s == nil || len(s) == 0 {
|
|
return C.nbyteslice{}
|
|
}
|
|
ptr, n := unsafe.Pointer(&s[0]), C.int(len(s))
|
|
if cpy {
|
|
nptr := C.malloc(C.size_t(n))
|
|
if nptr == nil {
|
|
panic("fromSlice: malloc failed")
|
|
}
|
|
copy((*[1<<31 - 1]byte)(nptr)[:n], (*[1<<31 - 1]byte)(ptr)[:n])
|
|
ptr = nptr
|
|
}
|
|
return C.nbyteslice{ptr: ptr, len: n}
|
|
}
|
|
|
|
// toSlice takes a nbyteslice and returns a byte slice with the data. If cpy is
|
|
// set, the slice contains a copy of the data. If not, the generated Go code
|
|
// calls releaseByteSlice after use.
|
|
func toSlice(s C.nbyteslice, cpy bool) []byte {
|
|
if s.ptr == nil || s.len == 0 {
|
|
return nil
|
|
}
|
|
var b []byte
|
|
if cpy {
|
|
b = C.GoBytes(s.ptr, C.int(s.len))
|
|
C.free(s.ptr)
|
|
} else {
|
|
b = (*[1<<31 - 1]byte)(unsafe.Pointer(s.ptr))[:s.len:s.len]
|
|
}
|
|
return b
|
|
}
|