android_translation_layer/src/api-impl-jni/util.c

#include <stdint.h>
#include <dlfcn.h>
#include <pthread.h>

#include <gtk/gtk.h>

#include "util.h"
#include "src/api-impl-jni/defines.h"

const char * attribute_set_get_string(JNIEnv *env, jobject attrs, char *attribute, char *schema)
{
	if (!attrs)
		return NULL;

	if(!schema)
		schema = "http://schemas.android.com/apk/res/android";

	jstring string = (jstring)(*env)->CallObjectMethod(env, attrs, handle_cache.attribute_set.getAttributeValue_string, _JSTRING(schema), _JSTRING(attribute));
	return string ? _CSTRING(string) : NULL;
}

int attribute_set_get_int(JNIEnv *env, jobject attrs, char *attribute, char *schema, int default_value)
{
	if (!attrs)
		return default_value;

	if(!schema)
		schema = "http://schemas.android.com/apk/res/android";

	return (*env)->CallIntMethod(env, attrs, handle_cache.attribute_set.getAttributeValue_int, _JSTRING(schema), _JSTRING(attribute), default_value);
}

JavaVM *jvm;

// TODO: use this everywhere, not just for gdb helper functions
JNIEnv * get_jni_env(void)
{
	JNIEnv *env;
	(*jvm)->GetEnv(jvm, (void**)&env, JNI_VERSION_1_6);
	return env;
}

JNIEnv * _gdb_get_jni_env(void)
{
	return get_jni_env();
}

void _gdb_get_java_stack_trace(void)
{
	JNIEnv *env = get_jni_env();
	(*env)->ExceptionDescribe(env);
}

void _gdb_force_java_stack_trace(void)
{
	JNIEnv *env = get_jni_env();
	(*env)->ThrowNew(env, (*env)->FindClass(env, "java/lang/Exception"), "forced stack trace");
	(*env)->ExceptionDescribe(env);
	(*env)->ExceptionClear(env);
}

extern char *apk_path;
void extract_from_apk(const char *path, const char *target) {
	JNIEnv *env = get_jni_env();
	(*env)->CallStaticVoidMethod(env, handle_cache.asset_manager.class, handle_cache.asset_manager.extractFromAPK, _JSTRING(apk_path), _JSTRING(path), _JSTRING(target));
}

/* logging with fallback to stderr */

typedef int __android_log_vprint_type(int prio, const char *tag, const char *fmt, va_list ap);

static int fallback_verbose_log(int prio, const char *tag, const char *fmt, va_list ap)
{
	int ret;

	static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
	pthread_mutex_lock(&mutex);
	static char buf[1024];
	ret = vsnprintf(buf, sizeof(buf), fmt, ap);
	fprintf(stderr, "%w64u: %s\n", (uint64_t)pthread_self(), buf);
	pthread_mutex_unlock(&mutex);

	return ret;
}

static int android_log_vprintf(int prio, const char *tag, const char *fmt, va_list ap)
{

	static __android_log_vprint_type *_android_log_vprintf = NULL;
	if(!_android_log_vprintf) {
		_android_log_vprintf = dlsym(RTLD_DEFAULT, "__android_log_vprint");

		if(!_android_log_vprintf) {
			_android_log_vprintf = &fallback_verbose_log;
		}
	}

	return _android_log_vprintf(prio, tag, fmt, ap);
}

int android_log_printf(android_LogPriority prio, const char *tag, const char *fmt, ...)
{
	int ret;

	va_list ap;
	va_start(ap, fmt);

	ret = android_log_vprintf(prio, tag, fmt, ap);

	va_end(ap);

	return ret;
}

void *get_nio_buffer(JNIEnv *env, jobject buffer, jarray *array_ref, jbyte **array)
{
	jclass class;
	void *pointer;
	int elementSizeShift, position;

	if (!buffer) {
		*array_ref = NULL;
		return NULL;
	}
	class = _CLASS(buffer);
	pointer = _PTR((*env)->GetLongField(env, buffer, _FIELD_ID(class, "address", "J")));
	elementSizeShift = (*env)->GetIntField(env, buffer, _FIELD_ID(class, "_elementSizeShift", "I"));
	position = (*env)->GetIntField(env, buffer, _FIELD_ID(class, "position", "I"));
	if (pointer) {   // buffer is direct
		*array_ref = NULL;
		pointer += position << elementSizeShift;
	} else {   // buffer is indirect
		*array_ref = (*env)->CallObjectMethod(env, buffer, _METHOD(class, "array", "()Ljava/lang/Object;"));
		jint offset = (*env)->CallIntMethod(env, buffer, _METHOD(class, "arrayOffset", "()I"));
		pointer = *array = (*env)->GetPrimitiveArrayCritical(env, *array_ref, NULL);
		pointer += (offset + position) << elementSizeShift;
	}
	return pointer;
}

void release_nio_buffer(JNIEnv *env, jarray array_ref, jbyte *array)
{
	if (array_ref)
		(*env)->ReleasePrimitiveArrayCritical(env, array_ref, array, 0);
}

int get_nio_buffer_size(JNIEnv *env, jobject buffer)
{
	jclass class = _CLASS(buffer);;
	int limit = (*env)->GetIntField(env, buffer, _FIELD_ID(class, "limit", "I"));
	int position = (*env)->GetIntField(env, buffer, _FIELD_ID(class, "position", "I"));

	return limit - position;
}


/* Calling these functions while snapshotting will cause Gtk to not snapshot the affected widgets.
 * Below are "safe" wrappers which will postpone the calls if inside a snapshot.
 * Specifically, gtk_widget_add_tick_callback will make sure the calls are made in the next
 * Update phase. */

/* callbacks */
static gboolean queue_set_text(GtkWidget *label, GdkFrameClock *frame_clock, gpointer str)
{
	gtk_label_set_text(GTK_LABEL(label), str);
	/* we always call strdup so we always want to free */
	free(str);
	return G_SOURCE_REMOVE;
}

static gboolean queue_queue_allocate(GtkWidget *widget, GdkFrameClock *frame_clock, gpointer user_data)
{
	gtk_widget_queue_allocate(widget);
	return G_SOURCE_REMOVE;
}

static gboolean queue_queue_resize(GtkWidget *widget, GdkFrameClock *frame_clock, gpointer user_data)
{
	gtk_widget_queue_resize(widget);
	return G_SOURCE_REMOVE;
}

/* Some functions call gtk_widget_queue_allocate or similar internally.
 * To prevent that from breaking the snapshotting process, when called at the wrong time,
 * we have to follow those functions with this pile of hacks that will unset the problematic flags. */
extern int snapshot_in_progress;
void atl_ensure_widget_snapshotability(GtkWidget *widget)
{
	if(snapshot_in_progress) {
		GtkAllocation allocation;
		G_GNUC_BEGIN_IGNORE_DEPRECATIONS
		/* we probably don't need to use this deprecated function but it sure is convenient */
		gtk_widget_get_allocation(widget, &allocation);
		G_GNUC_END_IGNORE_DEPRECATIONS
		/* this clears resize request, which seems to be necessary in some cases */
		gtk_widget_get_request_mode(widget);
		gtk_widget_size_allocate(widget, &allocation, gtk_widget_get_baseline(widget));
		// maybe we should schedule a call to queue_queue_allocate, but that causes problems in composeUI apps.

		/* the problematic flags get set all the way up the hierarchy */
		GtkWidget *parent = gtk_widget_get_parent(widget);
		if (parent) {
			atl_ensure_widget_snapshotability(parent);
		}
	}
}

void atl_safe_gtk_label_set_text(GtkLabel* label, const char* str)
{
	if(!snapshot_in_progress) {
		gtk_label_set_text(label, str);
	} else {
		/* strdup since the string may not exist by the time the callback runs */
		gtk_widget_add_tick_callback(GTK_WIDGET(label), queue_set_text, (gpointer)strdup(str), NULL);
	}
}

void atl_safe_gtk_widget_set_visible(GtkWidget *widget, gboolean visible)
{
	gtk_widget_set_visible(widget, visible);
	GtkWidget *parent = gtk_widget_get_parent(widget);
	if (parent) {
		atl_ensure_widget_snapshotability(parent);
	}
}

void atl_safe_gtk_widget_queue_allocate(GtkWidget *widget)
{
	if(!snapshot_in_progress) {
		gtk_widget_queue_allocate(widget);
	} else {
		gtk_widget_add_tick_callback(widget, queue_queue_allocate, NULL, NULL);
	}
}

void atl_safe_gtk_widget_queue_resize(GtkWidget *widget)
{
	if(!snapshot_in_progress) {
		gtk_widget_queue_resize(widget);
	} else {
		gtk_widget_add_tick_callback(widget, queue_queue_resize, NULL, NULL);
	}
}

GVariant *intent_serialize(JNIEnv *env, jobject intent) {
	if (!intent)
		return NULL;
	jstring action_jstr = _GET_OBJ_FIELD(intent, "action", "Ljava/lang/String;");
	jobject component = _GET_OBJ_FIELD(intent, "component", "Landroid/content/ComponentName;");
	jstring className_jstr = component ? _GET_OBJ_FIELD(component, "mClass", "Ljava/lang/String;") : NULL;
	jstring data_jstr = (*env)->CallObjectMethod(env, intent, handle_cache.intent.getDataString);

	const char *action = action_jstr ? (*env)->GetStringUTFChars(env, action_jstr, NULL) : NULL;
	const char *className = className_jstr ? (*env)->GetStringUTFChars(env, className_jstr, NULL) : NULL;
	const char *data = data_jstr ? (*env)->GetStringUTFChars(env, data_jstr, NULL) : NULL;
	GVariant *variant = g_variant_new(INTENT_G_VARIANT_TYPE_STRING, action ?: "", className ?: "", data ?: "");
	if (action_jstr)
		(*env)->ReleaseStringUTFChars(env, action_jstr, action);
	if (className_jstr)
		(*env)->ReleaseStringUTFChars(env, className_jstr, className);
	if (data_jstr)
		(*env)->ReleaseStringUTFChars(env, data_jstr, data);
	return variant;
}

jobject intent_deserialize(JNIEnv *env, GVariant *variant) {
	const char *action;
	const char *className;
	const char *data;
	g_variant_get(variant, INTENT_G_VARIANT_TYPE_STRING, &action, &className, &data);
	if (action && action[0] == '\0')
		action = NULL;
	if (className && className[0] == '\0')
		className = NULL;
	if (data && data[0] == '\0')
		data = NULL;

	jobject intent = (*env)->NewObject(env, handle_cache.intent.class, handle_cache.intent.constructor);
	_SET_OBJ_FIELD(intent, "action", "Ljava/lang/String;", _JSTRING(action));
	if (className)
		(*env)->CallObjectMethod(env, intent, handle_cache.intent.setClassName, _GET_STATIC_OBJ_FIELD(handle_cache.context.class, "this_application", "Landroid/app/Application;"), _JSTRING(className));
	if (data)
		_SET_OBJ_FIELD(intent, "data", "Landroid/net/Uri;", (*env)->CallStaticObjectMethod(env, handle_cache.uri.class, handle_cache.uri.parse, _JSTRING(data)));
	return intent;
}

const char *intent_actionname_from_type(int type) {
	switch (type) {
		case 0:
			return "app.startActivity";
		case 1:
			return "app.startService";
		case 2:
			return "app.sendBroadcast";
		default:
			return NULL;
	}
}