1 // Copyright 2024 The Chromium Authors
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "third_party/jni_zero/jni_zero.h"
6 #ifdef JNI_ZERO_ENABLE_TYPE_CONVERSIONS
7 #include <memory>
8
9 #include "third_party/jni_zero/default_conversions.h"
10
11 namespace jni_zero {
12
13 #define PRIMITIVE_ARRAY_CONVERSIONS(T, JTYPE, J) \
14 template <> \
15 std::vector<T> FromJniArray<std::vector<T>>( \
16 JNIEnv * env, const JavaRef<jobject>& j_object) { \
17 JTYPE##Array j_array = static_cast<JTYPE##Array>(j_object.obj()); \
18 jsize array_jsize = env->GetArrayLength(j_array); \
19 size_t array_size = static_cast<size_t>(array_jsize); \
20 std::vector<T> ret; \
21 ret.resize(array_size); \
22 env->Get##J##ArrayRegion(j_array, 0, array_jsize, \
23 reinterpret_cast<JTYPE*>(ret.data())); \
24 return ret; \
25 } \
26 template <> \
27 ScopedJavaLocalRef<jarray> ToJniArray<std::vector<T>>( \
28 JNIEnv * env, const std::vector<T>& vec) { \
29 jsize array_jsize = static_cast<jsize>(vec.size()); \
30 JTYPE##Array arr = env->New##J##Array(array_jsize); \
31 CheckException(env); \
32 env->Set##J##ArrayRegion(arr, 0, array_jsize, \
33 reinterpret_cast<const JTYPE*>(vec.data())); \
34 return ScopedJavaLocalRef<jarray>(env, arr); \
35 }
36
PRIMITIVE_ARRAY_CONVERSIONS(int64_t,jlong,Long)37 PRIMITIVE_ARRAY_CONVERSIONS(int64_t, jlong, Long)
38 PRIMITIVE_ARRAY_CONVERSIONS(int32_t, jint, Int)
39 PRIMITIVE_ARRAY_CONVERSIONS(int16_t, jshort, Short)
40 PRIMITIVE_ARRAY_CONVERSIONS(uint16_t, jchar, Char)
41 PRIMITIVE_ARRAY_CONVERSIONS(uint8_t, jbyte, Byte)
42 PRIMITIVE_ARRAY_CONVERSIONS(float, jfloat, Float)
43 PRIMITIVE_ARRAY_CONVERSIONS(double, jdouble, Double)
44
45 // Specialization for bool, because vector<bool> is a bitmask under-the-hood,
46 // not an actual vector of bool values, and thus can't be directly copied.
47 template <>
48 std::vector<bool> FromJniArray<std::vector<bool>>(
49 JNIEnv* env,
50 const JavaRef<jobject>& j_object) {
51 jbooleanArray j_array = static_cast<jbooleanArray>(j_object.obj());
52 jsize array_jsize = env->GetArrayLength(j_array);
53 size_t array_size = static_cast<size_t>(array_jsize);
54 auto arr = std::make_unique<jboolean[]>(array_size);
55 env->GetBooleanArrayRegion(j_array, 0, array_jsize, arr.get());
56
57 std::vector<bool> ret;
58 ret.resize(array_size);
59 for (size_t i = 0; i < array_size; ++i) {
60 ret[i] = arr[i];
61 }
62 return ret;
63 }
64
65 template <>
ToJniArray(JNIEnv * env,const std::vector<bool> & vec)66 ScopedJavaLocalRef<jarray> ToJniArray<std::vector<bool>>(
67 JNIEnv* env,
68 const std::vector<bool>& vec) {
69 jsize array_jsize = static_cast<jsize>(vec.size());
70 size_t array_size = static_cast<size_t>(array_jsize);
71
72 auto arr = std::make_unique<jboolean[]>(array_size);
73 for (size_t i = 0; i < array_size; ++i) {
74 arr[i] = vec[i];
75 }
76
77 jbooleanArray j_array = env->NewBooleanArray(array_jsize);
78 CheckException(env);
79 env->SetBooleanArrayRegion(j_array, 0, array_jsize, arr.get());
80 return ScopedJavaLocalRef<jarray>(env, j_array);
81 }
82 } // namespace jni_zero
83 #endif // JNI_ZERO_ENABLE_TYPE_CONVERSIONS
84