2c91e1e7d2
Summary: So I can use them from JSBigString whose methods are marked const. Reviewed By: emilsjolander Differential Revision: D5020648 fbshipit-source-id: 6e60b80cb3d4718bab25dd6ca9627aee862117db
78 lines
2.4 KiB
C++
78 lines
2.4 KiB
C++
/*
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* Copyright (c) 2016-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#include <fb/fbjni/ByteBuffer.h>
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#include <stdexcept>
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#include <fb/fbjni/References.h>
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namespace facebook {
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namespace jni {
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namespace {
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local_ref<JByteBuffer> createEmpty() {
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static auto cls = JByteBuffer::javaClassStatic();
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static auto meth = cls->getStaticMethod<JByteBuffer::javaobject(int)>("allocateDirect");
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return meth(cls, 0);
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}
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}
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local_ref<JByteBuffer> JByteBuffer::wrapBytes(uint8_t* data, size_t size) {
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// env->NewDirectByteBuffer requires that size is positive. Android's
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// dalvik returns an invalid result and Android's art aborts if size == 0.
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// Workaround this by using a slow path through Java in that case.
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if (!size) {
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return createEmpty();
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}
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auto res = adopt_local(static_cast<javaobject>(Environment::current()->NewDirectByteBuffer(data, size)));
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FACEBOOK_JNI_THROW_PENDING_EXCEPTION();
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if (!res) {
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throw std::runtime_error("Direct byte buffers are unsupported.");
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}
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return res;
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}
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uint8_t* JByteBuffer::getDirectBytes() const {
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if (!self()) {
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throwNewJavaException("java/lang/NullPointerException", "java.lang.NullPointerException");
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}
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void* bytes = Environment::current()->GetDirectBufferAddress(self());
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FACEBOOK_JNI_THROW_PENDING_EXCEPTION();
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if (!bytes) {
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throw std::runtime_error(
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isDirect() ?
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"Attempt to get direct bytes of non-direct byte buffer." :
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"Error getting direct bytes of byte buffer.");
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}
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return static_cast<uint8_t*>(bytes);
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}
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size_t JByteBuffer::getDirectSize() const {
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if (!self()) {
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throwNewJavaException("java/lang/NullPointerException", "java.lang.NullPointerException");
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}
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int size = Environment::current()->GetDirectBufferCapacity(self());
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FACEBOOK_JNI_THROW_PENDING_EXCEPTION();
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if (size < 0) {
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throw std::runtime_error(
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isDirect() ?
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"Attempt to get direct size of non-direct byte buffer." :
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"Error getting direct size of byte buffer.");
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}
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return static_cast<size_t>(size);
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}
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bool JByteBuffer::isDirect() const {
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static auto meth = javaClassStatic()->getMethod<jboolean()>("isDirect");
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return meth(self());
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}
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}}
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