27a7c7e186
C compiler warnings are hidden in the gomobile build process. Expose them through -Werror. Change-Id: I2d87e5985f9ff874dc6feb836ba35c2bd848bfa6 Reviewed-on: https://go-review.googlesource.com/31517 Reviewed-by: David Crawshaw <crawshaw@golang.org>
99 lines
2.7 KiB
Plaintext
99 lines
2.7 KiB
Plaintext
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package gomobile_bind
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// Go support functions for bindings. This file is copied into the
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// generated gomobile_bind package and compiled along with the
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// generated binding files.
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//#cgo CFLAGS: -Werror
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//#cgo LDFLAGS: -llog
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//#include <jni.h>
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//#include <stdint.h>
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//#include <stdlib.h>
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//#include "seq.h"
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import "C"
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import (
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"unsafe"
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"golang.org/x/mobile/bind/seq"
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)
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// DestroyRef is called by Java to inform Go it is done with a reference.
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//export DestroyRef
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func DestroyRef(refnum C.int32_t) {
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seq.Delete(int32(refnum))
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}
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// encodeString returns a copy of a Go string as a UTF16 encoded nstring.
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// The returned data is freed in go_seq_to_java_string.
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//
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// encodeString uses UTF16 as the intermediate format. Note that UTF8 is an obvious
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// alternative, but JNI only supports a C-safe variant of UTF8 (modified UTF8).
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func encodeString(s string) C.nstring {
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n := C.int(len(s))
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if n == 0 {
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return C.nstring{}
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}
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// Allocate enough for the worst case estimate, every character is a surrogate pair
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worstCaseLen := 4 * len(s)
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utf16buf := C.malloc(C.size_t(worstCaseLen))
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if utf16buf == nil {
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panic("encodeString: malloc failed")
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}
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chars := (*[1<<30 - 1]uint16)(unsafe.Pointer(utf16buf))[:worstCaseLen/2 : worstCaseLen/2]
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nchars := seq.UTF16Encode(s, chars)
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return C.nstring{chars: unsafe.Pointer(utf16buf), len: C.jsize(nchars*2)}
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}
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// decodeString decodes a UTF8 encoded nstring to a Go string. The data
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// in str is freed after use.
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func decodeString(str C.nstring) string {
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if str.chars == nil {
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return ""
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}
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chars := (*[1<<31 - 1]byte)(str.chars)[:str.len]
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s := string(chars)
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C.free(str.chars)
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return s
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}
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// fromSlice converts a slice to a jbyteArray cast as a nbyteslice. If cpy
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// is set, the returned slice is a copy to be free by go_seq_to_java_bytearray.
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func fromSlice(s []byte, cpy bool) C.nbyteslice {
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if s == nil || len(s) == 0 {
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return C.nbyteslice{}
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}
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var ptr *C.jbyte
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n := C.jsize(len(s))
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if cpy {
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ptr = (*C.jbyte)(C.malloc(C.size_t(n)))
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if ptr == nil {
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panic("fromSlice: malloc failed")
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}
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copy((*[1<<31 - 1]byte)(unsafe.Pointer(ptr))[:n], s)
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} else {
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ptr = (*C.jbyte)(unsafe.Pointer(&s[0]))
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}
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return C.nbyteslice{ptr: unsafe.Pointer(ptr), len: n}
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}
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// toSlice takes a nbyteslice (jbyteArray) and returns a byte slice
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// with the data. If cpy is set, the slice contains a copy of the data and is
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// freed.
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func toSlice(s C.nbyteslice, cpy bool) []byte {
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if s.ptr == nil || s.len == 0 {
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return nil
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}
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var b []byte
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if cpy {
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b = C.GoBytes(s.ptr, C.int(s.len))
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C.free(s.ptr)
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} else {
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b = (*[1<<31 - 1]byte)(unsafe.Pointer(s.ptr))[:s.len:s.len]
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}
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return b
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}
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