122 lines
3.7 KiB
C++
122 lines
3.7 KiB
C++
/*
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* Copyright 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//#define LOG_NDEBUG 0
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#define LOG_TAG "ImageHashManager"
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#include <android/hardware_buffer_jni.h>
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#include <log/log_main.h>
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#include <nativehelper/JNIHelp.h>
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#include <nativehelper/scoped_utf_chars.h>
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#include <array>
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#include <string>
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#include <ImageHashManager.h>
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namespace android {
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class BufferWrapper {
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public:
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BufferWrapper(AHardwareBuffer* buffer) : mBuffer(buffer) {}
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int lock(uint8_t** buf) {
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if (mIsLocked) {
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return -1;
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}
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int status = AHardwareBuffer_lock(mBuffer,
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AHARDWAREBUFFER_USAGE_CPU_READ_OFTEN |
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AHARDWAREBUFFER_USAGE_CPU_WRITE_NEVER,
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-1 /* fence */, nullptr /* rect */,
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reinterpret_cast<void**>(buf));
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if (!status) {
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mIsLocked = true;
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}
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return status;
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}
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void unlock() {
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if (!mIsLocked) {
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return;
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}
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mIsLocked = false;
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AHardwareBuffer_unlock(mBuffer, nullptr);
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}
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~BufferWrapper() { unlock(); }
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private:
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AHardwareBuffer* mBuffer = nullptr;
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bool mIsLocked = false;
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};
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static jbyteArray nativeGenerateHash(JNIEnv* env, jobject clazz, jobject hardwareBufferObj,
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jstring hashAlgorithmString) {
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ScopedUtfChars hashAlgorithmChars(env, hashAlgorithmString);
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std::string hashAlgorithm(hashAlgorithmChars.c_str());
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transform(hashAlgorithm.begin(), hashAlgorithm.end(), hashAlgorithm.begin(), ::tolower);
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AHardwareBuffer* hardwareBuffer = AHardwareBuffer_fromHardwareBuffer(env, hardwareBufferObj);
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AHardwareBuffer_Desc bufferDesc;
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AHardwareBuffer_describe(hardwareBuffer, &bufferDesc);
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BufferWrapper bufferWrapper(hardwareBuffer);
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uint8_t* buf = nullptr;
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int32_t status = bufferWrapper.lock(&buf);
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if (status) {
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ALOGE("Failed to lock buffer status=%d", status);
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return nullptr;
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}
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std::array<uint8_t, 8> imageHash;
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status = ImageHashManager::generateHash(hashAlgorithm, buf, bufferDesc, &imageHash);
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if (status) {
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ALOGE("Failed to generate hash status=%d", status);
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return nullptr;
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}
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jbyteArray ret = env->NewByteArray(8);
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if (ret) {
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jbyte* bytes = (jbyte*)env->GetPrimitiveArrayCritical(ret, 0);
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if (bytes) {
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memcpy(bytes, imageHash.data(), 8);
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env->ReleasePrimitiveArrayCritical(ret, bytes, 0);
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}
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}
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return ret;
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}
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// clang-format off
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static const JNINativeMethod gMethods[] = {
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{"nativeGenerateHash", "(Landroid/hardware/HardwareBuffer;Ljava/lang/String;)[B",
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(void *)nativeGenerateHash},
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};
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// clang-format on
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int register_android_ext_services_displayhash_DisplayHashAlgorithm(JNIEnv* env) {
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int res = jniRegisterNativeMethods(env, "android/ext/services/displayhash/ImageHashManager",
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gMethods, NELEM(gMethods));
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LOG_ALWAYS_FATAL_IF(res < 0, "Unable to register native methods.");
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return res;
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}
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} /* namespace android */
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