android: Implement SAF support & migrate to SDK 31. (#4)

1 files changed, 98 insertions, 0 deletions

diff --git a/src/common/fs/fs_android.cpp b/src/common/fs/fs_android.cpp
new file mode 100644
index 000000000..298a79bac
--- /dev/null
+++ b/src/common/fs/fs_android.cpp
@@ -0,0 +1,98 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "common/fs/fs_android.h"
+
+namespace Common::FS::Android {
+
+JNIEnv* GetEnvForThread() {
+    thread_local static struct OwnedEnv {
+        OwnedEnv() {
+            status = g_jvm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6);
+            if (status == JNI_EDETACHED)
+                g_jvm->AttachCurrentThread(&env, nullptr);
+        }
+
+        ~OwnedEnv() {
+            if (status == JNI_EDETACHED)
+                g_jvm->DetachCurrentThread();
+        }
+
+        int status;
+        JNIEnv* env = nullptr;
+    } owned;
+    return owned.env;
+}
+
+void RegisterCallbacks(JNIEnv* env, jclass clazz) {
+    env->GetJavaVM(&g_jvm);
+    native_library = clazz;
+
+#define FR(FunctionName, ReturnValue, JMethodID, Caller, JMethodName, Signature)                   \
+    F(JMethodID, JMethodName, Signature)
+#define FS(FunctionName, ReturnValue, Parameters, JMethodID, JMethodName, Signature)               \
+    F(JMethodID, JMethodName, Signature)
+#define F(JMethodID, JMethodName, Signature)                                                       \
+    JMethodID = env->GetStaticMethodID(native_library, JMethodName, Signature);
+    ANDROID_SINGLE_PATH_DETERMINE_FUNCTIONS(FR)
+    ANDROID_STORAGE_FUNCTIONS(FS)
+#undef F
+#undef FS
+#undef FR
+}
+
+void UnRegisterCallbacks() {
+#define FR(FunctionName, ReturnValue, JMethodID, Caller, JMethodName, Signature) F(JMethodID)
+#define FS(FunctionName, ReturnValue, Parameters, JMethodID, JMethodName, Signature) F(JMethodID)
+#define F(JMethodID) JMethodID = nullptr;
+    ANDROID_SINGLE_PATH_DETERMINE_FUNCTIONS(FR)
+    ANDROID_STORAGE_FUNCTIONS(FS)
+#undef F
+#undef FS
+#undef FR
+}
+
+bool IsContentUri(const std::string& path) {
+    constexpr std::string_view prefix = "content://";
+    if (path.size() < prefix.size()) [[unlikely]] {
+        return false;
+    }
+
+    return path.find(prefix) == 0;
+}
+
+int OpenContentUri(const std::string& filepath, OpenMode openmode) {
+    if (open_content_uri == nullptr)
+        return -1;
+
+    const char* mode = "";
+    switch (openmode) {
+    case OpenMode::Read:
+        mode = "r";
+        break;
+    default:
+        UNIMPLEMENTED();
+        return -1;
+    }
+    auto env = GetEnvForThread();
+    jstring j_filepath = env->NewStringUTF(filepath.c_str());
+    jstring j_mode = env->NewStringUTF(mode);
+    return env->CallStaticIntMethod(native_library, open_content_uri, j_filepath, j_mode);
+}
+
+#define FR(FunctionName, ReturnValue, JMethodID, Caller, JMethodName, Signature)                   \
+    F(FunctionName, ReturnValue, JMethodID, Caller)
+#define F(FunctionName, ReturnValue, JMethodID, Caller)                                            \
+    ReturnValue FunctionName(const std::string& filepath) {                                        \
+        if (JMethodID == nullptr) {                                                                \
+            return 0;                                                                              \
+        }                                                                                          \
+        auto env = GetEnvForThread();                                                              \
+        jstring j_filepath = env->NewStringUTF(filepath.c_str());                                  \
+        return env->Caller(native_library, JMethodID, j_filepath);                                 \
+    }
+ANDROID_SINGLE_PATH_DETERMINE_FUNCTIONS(FR)
+#undef F
+#undef FR
+
+} // namespace Common::FS::Android