tdlight/td/tl/tl_jni_object.cpp

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/tl/tl_jni_object.h"
#include "td/utils/common.h"
#include "td/utils/logging.h"
#include "td/utils/misc.h"
#include "td/utils/Slice.h"
#include <memory>
namespace td {
namespace jni {
thread_local bool parse_error;
static jclass BooleanClass;
static jclass IntegerClass;
static jclass LongClass;
static jclass DoubleClass;
static jclass StringClass;
static jclass ObjectClass;
jclass ArrayKeyboardButtonClass;
jclass ArrayInlineKeyboardButtonClass;
jclass ArrayPageBlockTableCellClass;
jmethodID GetConstructorID;
jmethodID BooleanGetValueMethodID;
jmethodID IntegerGetValueMethodID;
jmethodID LongGetValueMethodID;
jmethodID DoubleGetValueMethodID;
static void fatal_error(JNIEnv *env, CSlice error) {
LOG(ERROR) << error;
env->FatalError(error.c_str());
}
jclass get_jclass(JNIEnv *env, const char *class_name) {
jclass clazz = env->FindClass(class_name);
if (!clazz) {
fatal_error(env, PSLICE() << "Can't find class [" << class_name << "]");
}
jclass clazz_global = (jclass)env->NewGlobalRef(clazz);
env->DeleteLocalRef(clazz);
if (!clazz_global) {
fatal_error(env, PSLICE() << "Can't create global reference to [" << class_name << "]");
}
return clazz_global;
}
jmethodID get_method_id(JNIEnv *env, jclass clazz, const char *name, const char *signature) {
jmethodID res = env->GetMethodID(clazz, name, signature);
if (!res) {
fatal_error(env, PSLICE() << "Can't find method [" << name << "] with signature [" << signature << "]");
}
return res;
}
jfieldID get_field_id(JNIEnv *env, jclass clazz, const char *name, const char *signature) {
jfieldID res = env->GetFieldID(clazz, name, signature);
if (!res) {
fatal_error(env, PSLICE() << "Can't find field [" << name << "] with signature [" << signature << "]");
}
return res;
}
void register_native_method(JNIEnv *env, jclass clazz, std::string name, std::string signature, void *function_ptr) {
JNINativeMethod native_method{&name[0], &signature[0], function_ptr};
if (env->RegisterNatives(clazz, &native_method, 1) != 0) {
fatal_error(env, PSLICE() << "RegisterNatives failed for " << name << " with signature " << signature);
}
}
std::unique_ptr<JNIEnv, JvmThreadDetacher> get_jni_env(JavaVM *java_vm, jint jni_version) {
JNIEnv *env = nullptr;
if (java_vm->GetEnv(reinterpret_cast<void **>(&env), jni_version) == JNI_EDETACHED) {
#ifdef JDK1_2 // if not Android JNI
auto p_env = reinterpret_cast<void **>(&env);
#else
auto p_env = &env;
#endif
if (java_vm->AttachCurrentThread(p_env, nullptr) != JNI_OK) {
java_vm = nullptr;
env = nullptr;
}
} else {
java_vm = nullptr;
}
return std::unique_ptr<JNIEnv, JvmThreadDetacher>(env, JvmThreadDetacher(java_vm));
}
void init_vars(JNIEnv *env, const char *td_api_java_package) {
BooleanClass = get_jclass(env, "java/lang/Boolean");
IntegerClass = get_jclass(env, "java/lang/Integer");
LongClass = get_jclass(env, "java/lang/Long");
DoubleClass = get_jclass(env, "java/lang/Double");
StringClass = get_jclass(env, "java/lang/String");
ObjectClass = get_jclass(env, (PSLICE() << td_api_java_package << "/TdApi$Object").c_str());
ArrayKeyboardButtonClass =
get_jclass(env, (PSLICE() << "[L" << td_api_java_package << "/TdApi$KeyboardButton;").c_str());
ArrayInlineKeyboardButtonClass =
get_jclass(env, (PSLICE() << "[L" << td_api_java_package << "/TdApi$InlineKeyboardButton;").c_str());
ArrayPageBlockTableCellClass =
get_jclass(env, (PSLICE() << "[L" << td_api_java_package << "/TdApi$PageBlockTableCell;").c_str());
GetConstructorID = get_method_id(env, ObjectClass, "getConstructor", "()I");
BooleanGetValueMethodID = get_method_id(env, BooleanClass, "booleanValue", "()Z");
IntegerGetValueMethodID = get_method_id(env, IntegerClass, "intValue", "()I");
LongGetValueMethodID = get_method_id(env, LongClass, "longValue", "()J");
DoubleGetValueMethodID = get_method_id(env, DoubleClass, "doubleValue", "()D");
}
static size_t get_utf8_from_utf16_length(const jchar *p, jsize len) {
size_t result = 0;
for (jsize i = 0; i < len; i++) {
unsigned int cur = p[i];
if ((cur & 0xF800) == 0xD800) {
if (i < len) {
unsigned int next = p[++i];
if ((next & 0xFC00) == 0xDC00 && (cur & 0x400) == 0) {
result += 4;
continue;
}
}
// TODO wrong UTF-16, it is possible
return 0;
}
result += 1 + (cur >= 0x80) + (cur >= 0x800);
}
return result;
}
static void utf16_to_utf8(const jchar *p, jsize len, char *res) {
for (jsize i = 0; i < len; i++) {
unsigned int cur = p[i];
// TODO conversion unsigned int -> signed char is implementation defined
if (cur <= 0x7f) {
*res++ = static_cast<char>(cur);
} else if (cur <= 0x7ff) {
*res++ = static_cast<char>(0xc0 | (cur >> 6));
*res++ = static_cast<char>(0x80 | (cur & 0x3f));
} else if ((cur & 0xF800) != 0xD800) {
*res++ = static_cast<char>(0xe0 | (cur >> 12));
*res++ = static_cast<char>(0x80 | ((cur >> 6) & 0x3f));
*res++ = static_cast<char>(0x80 | (cur & 0x3f));
} else {
// correctness is already checked
unsigned int next = p[++i];
unsigned int val = ((cur - 0xD800) << 10) + next - 0xDC00 + 0x10000;
*res++ = static_cast<char>(0xf0 | (val >> 18));
*res++ = static_cast<char>(0x80 | ((val >> 12) & 0x3f));
*res++ = static_cast<char>(0x80 | ((val >> 6) & 0x3f));
*res++ = static_cast<char>(0x80 | (val & 0x3f));
}
}
}
static jsize get_utf16_from_utf8_length(const char *p, size_t len, jsize *surrogates) {
// UTF-8 correctness is supposed
jsize result = 0;
for (size_t i = 0; i < len; i++) {
result += ((p[i] & 0xc0) != 0x80);
*surrogates += ((p[i] & 0xf8) == 0xf0);
}
return result;
}
static void utf8_to_utf16(const char *p, size_t len, jchar *res) {
// UTF-8 correctness is supposed
for (size_t i = 0; i < len;) {
unsigned int a = static_cast<unsigned char>(p[i++]);
if (a >= 0x80) {
unsigned int b = static_cast<unsigned char>(p[i++]);
if (a >= 0xe0) {
unsigned int c = static_cast<unsigned char>(p[i++]);
if (a >= 0xf0) {
unsigned int d = static_cast<unsigned char>(p[i++]);
unsigned int val = ((a & 0x07) << 18) + ((b & 0x3f) << 12) + ((c & 0x3f) << 6) + (d & 0x3f) - 0x10000;
*res++ = static_cast<jchar>(0xD800 + (val >> 10));
*res++ = static_cast<jchar>(0xDC00 + (val & 0x3ff));
} else {
*res++ = static_cast<jchar>(((a & 0x0f) << 12) + ((b & 0x3f) << 6) + (c & 0x3f));
}
} else {
*res++ = static_cast<jchar>(((a & 0x1f) << 6) + (b & 0x3f));
}
} else {
*res++ = static_cast<jchar>(a);
}
}
}
std::string fetch_string(JNIEnv *env, jobject o, jfieldID id) {
jstring s = (jstring)env->GetObjectField(o, id);
if (s == nullptr) {
// treat null as an empty string
return std::string();
}
std::string res = from_jstring(env, s);
env->DeleteLocalRef(s);
return res;
}
std::string from_jstring(JNIEnv *env, jstring s) {
if (!s) {
return "";
}
jsize s_len = env->GetStringLength(s);
const jchar *p = env->GetStringChars(s, nullptr);
if (p == nullptr) {
parse_error = true;
return std::string();
}
size_t len = get_utf8_from_utf16_length(p, s_len);
std::string res(len, '\0');
if (len) {
utf16_to_utf8(p, s_len, &res[0]);
}
env->ReleaseStringChars(s, p);
return res;
}
jstring to_jstring(JNIEnv *env, const std::string &s) {
jsize surrogates = 0;
jsize unicode_len = get_utf16_from_utf8_length(s.c_str(), s.size(), &surrogates);
if (surrogates == 0) {
// TODO '\0'
return env->NewStringUTF(s.c_str());
}
jsize result_len = surrogates + unicode_len;
if (result_len <= 256) {
jchar result[256];
utf8_to_utf16(s.c_str(), s.size(), result);
return env->NewString(result, result_len);
}
auto result = std::make_unique<jchar[]>(result_len);
utf8_to_utf16(s.c_str(), s.size(), result.get());
return env->NewString(result.get(), result_len);
}
std::string from_bytes(JNIEnv *env, jbyteArray arr) {
std::string b;
if (arr != nullptr) {
jsize length = env->GetArrayLength(arr);
if (length != 0) {
b.resize(narrow_cast<size_t>(length));
env->GetByteArrayRegion(arr, 0, length, reinterpret_cast<jbyte *>(&b[0]));
}
env->DeleteLocalRef(arr);
}
return b;
}
jbyteArray to_bytes(JNIEnv *env, const std::string &b) {
static_assert(sizeof(char) == sizeof(jbyte), "Mismatched jbyte size");
jsize length = narrow_cast<jsize>(b.size());
jbyteArray arr = env->NewByteArray(length);
if (arr != nullptr && length != 0) {
env->SetByteArrayRegion(arr, 0, length, reinterpret_cast<const jbyte *>(b.data()));
}
return arr;
}
jintArray store_vector(JNIEnv *env, const std::vector<std::int32_t> &v) {
static_assert(sizeof(std::int32_t) == sizeof(jint), "Mismatched jint size");
jsize length = narrow_cast<jsize>(v.size());
jintArray arr = env->NewIntArray(length);
if (arr != nullptr && length != 0) {
env->SetIntArrayRegion(arr, 0, length, reinterpret_cast<const jint *>(&v[0]));
}
return arr;
}
jlongArray store_vector(JNIEnv *env, const std::vector<std::int64_t> &v) {
static_assert(sizeof(std::int64_t) == sizeof(jlong), "Mismatched jlong size");
jsize length = narrow_cast<jsize>(v.size());
jlongArray arr = env->NewLongArray(length);
if (arr != nullptr && length != 0) {
env->SetLongArrayRegion(arr, 0, length, reinterpret_cast<const jlong *>(&v[0]));
}
return arr;
}
jdoubleArray store_vector(JNIEnv *env, const std::vector<double> &v) {
static_assert(sizeof(double) == sizeof(jdouble), "Mismatched jdouble size");
jsize length = narrow_cast<jsize>(v.size());
jdoubleArray arr = env->NewDoubleArray(length);
if (arr != nullptr && length != 0) {
env->SetDoubleArrayRegion(arr, 0, length, reinterpret_cast<const jdouble *>(&v[0]));
}
return arr;
}
jobjectArray store_vector(JNIEnv *env, const std::vector<std::string> &v) {
jsize length = narrow_cast<jsize>(v.size());
jobjectArray arr = env->NewObjectArray(length, StringClass, 0);
if (arr != nullptr) {
for (jsize i = 0; i < length; i++) {
jstring str = to_jstring(env, v[i]);
if (str) {
env->SetObjectArrayElement(arr, i, str);
env->DeleteLocalRef(str);
}
}
}
return arr;
}
std::vector<std::int32_t> fetch_vector(JNIEnv *env, jintArray arr) {
std::vector<std::int32_t> result;
if (arr != nullptr) {
jsize length = env->GetArrayLength(arr);
if (length != 0) {
result.resize(length);
env->GetIntArrayRegion(arr, 0, length, reinterpret_cast<jint *>(&result[0]));
}
env->DeleteLocalRef(arr);
}
return result;
}
std::vector<std::int64_t> fetch_vector(JNIEnv *env, jlongArray arr) {
std::vector<std::int64_t> result;
if (arr != nullptr) {
jsize length = env->GetArrayLength(arr);
if (length != 0) {
result.resize(length);
env->GetLongArrayRegion(arr, 0, length, reinterpret_cast<jlong *>(&result[0]));
}
env->DeleteLocalRef(arr);
}
return result;
}
std::vector<double> fetch_vector(JNIEnv *env, jdoubleArray arr) {
std::vector<double> result;
if (arr != nullptr) {
jsize length = env->GetArrayLength(arr);
if (length != 0) {
result.resize(length);
env->GetDoubleArrayRegion(arr, 0, length, reinterpret_cast<jdouble *>(&result[0]));
}
env->DeleteLocalRef(arr);
}
return result;
}
} // namespace jni
} // namespace td