Ported: Fix issue preventing the Android Editor from displaying the project content

The issue was causing by a bug within the logic for `FileAccessFilesystemJAndroid#eof_reached()` causing that value to remain false after the eof was reached.
This in turn caused an infinite loop in the file scanner preventing the project's content from showing up.
-m4gr3d
30479543b0

platform/android/file_access_filesystem_jandroid.cpp

@@ -45,6 +45,7 @@ jmethodID FileAccessFilesystemJAndroid::_file_seek_end = nullptr;
 jmethodID FileAccessFilesystemJAndroid::_file_read = nullptr;
 jmethodID FileAccessFilesystemJAndroid::_file_tell = nullptr;
 jmethodID FileAccessFilesystemJAndroid::_file_eof = nullptr;
+jmethodID FileAccessFilesystemJAndroid::_file_set_eof = nullptr;
 jmethodID FileAccessFilesystemJAndroid::_file_close = nullptr;
 jmethodID FileAccessFilesystemJAndroid::_file_write = nullptr;
 jmethodID FileAccessFilesystemJAndroid::_file_flush = nullptr;
@@ -161,6 +162,16 @@ bool FileAccessFilesystemJAndroid::eof_reached() const {
 	}
 }
 
+void FileAccessFilesystemJAndroid::_set_eof(bool eof) {
+	if (_file_set_eof) {
+		ERR_FAIL_COND_MSG(!is_open(), "File must be opened before use.");
+
+		JNIEnv *env = get_jni_env();
+		ERR_FAIL_COND(env == nullptr);
+		env->CallVoidMethod(file_access_handler, _file_set_eof, id, eof);
+	}
+}
+
 uint8_t FileAccessFilesystemJAndroid::get_8() const {
 	ERR_FAIL_COND_V_MSG(!is_open(), 0, "File must be opened before use.");
 	uint8_t byte;
@@ -183,6 +194,7 @@ String FileAccessFilesystemJAndroid::get_line() const {
 	while (true) {
 		size_t line_buffer_size = MIN(buffer_size_limit, file_size - get_position());
 		if (line_buffer_size <= 0) {
+			const_cast<FileAccessFilesystemJAndroid *>(this)->_set_eof(true);
 			break;
 		}
 
@@ -309,6 +321,7 @@ void FileAccessFilesystemJAndroid::setup(jobject p_file_access_handler) {
 	_file_get_size = env->GetMethodID(cls, "fileGetSize", "(I)J");
 	_file_tell = env->GetMethodID(cls, "fileGetPosition", "(I)J");
 	_file_eof = env->GetMethodID(cls, "isFileEof", "(I)Z");
+	_file_set_eof = env->GetMethodID(cls, "setFileEof", "(IZ)V");
 	_file_seek = env->GetMethodID(cls, "fileSeek", "(IJ)V");
 	_file_seek_end = env->GetMethodID(cls, "fileSeekFromEnd", "(IJ)V");
 	_file_read = env->GetMethodID(cls, "fileRead", "(ILjava/nio/ByteBuffer;)I");

platform/android/file_access_filesystem_jandroid.h

@@ -44,6 +44,7 @@ class FileAccessFilesystemJAndroid : public FileAccess {
 	static jmethodID _file_seek_end;
 	static jmethodID _file_tell;
 	static jmethodID _file_eof;
+	static jmethodID _file_set_eof;
 	static jmethodID _file_read;
 	static jmethodID _file_write;
 	static jmethodID _file_flush;
@@ -55,6 +56,8 @@ class FileAccessFilesystemJAndroid : public FileAccess {
 	String absolute_path;
 	String path_src;
 
+	void _set_eof(bool eof);
+
 public:
 	virtual Error _open(const String &p_path, int p_mode_flags); ///< open a file
 	virtual void close(); ///< close a file

platform/android/java/lib/src/net/relintai/pandemonium/pandemonium/io/file/DataAccess.kt

@@ -104,7 +104,6 @@ internal abstract class DataAccess(private val filePath: String) {
 
 	protected abstract val fileChannel: FileChannel
 	internal var endOfFile = false
-		private set
 
 	fun close() {
 		try {
@@ -125,9 +124,7 @@ internal abstract class DataAccess(private val filePath: String) {
 	fun seek(position: Long) {
 		try {
 			fileChannel.position(position)
-			if (position <= size()) {
-				endOfFile = false
-			}
+			endOfFile = position >= fileChannel.size()
 		} catch (e: Exception) {
 			Log.w(TAG, "Exception when seeking file $filePath.", e)
 		}
@@ -161,8 +158,7 @@ internal abstract class DataAccess(private val filePath: String) {
 	fun read(buffer: ByteBuffer): Int {
 		return try {
 			val readBytes = fileChannel.read(buffer)
-      endOfFile = readBytes == -1
-					|| (fileChannel.position() >= fileChannel.size() && fileChannel.size() > 0)
+			endOfFile = readBytes == -1 || (fileChannel.position() >= fileChannel.size())
 			if (readBytes == -1) {
 				0
 			} else {

platform/android/java/lib/src/net/relintai/pandemonium/pandemonium/io/file/FileAccessHandler.kt

@@ -194,6 +194,11 @@ class FileAccessHandler(val context: Context) {
 		return files[fileId].endOfFile
 	}
 
+	fun setFileEof(fileId: Int, eof: Boolean) {
+		val file = files[fileId] ?: return
+		file.endOfFile = eof
+	}
+
 	fun fileClose(fileId: Int) {
 		if (hasFileId(fileId)) {
 			files[fileId].close()