[FileAccess] Implement `resize` method.

5 files changed, 57 insertions, 0 deletions

diff --git a/platform/android/file_access_android.h b/platform/android/file_access_android.h
index ec613b6687..bfe590b22f 100644
--- a/platform/android/file_access_android.h
+++ b/platform/android/file_access_android.h
@@ -65,6 +65,7 @@ public:
 
 	virtual bool eof_reached() const override; // reading passed EOF
 
+	virtual Error resize(int64_t p_length) override { return ERR_UNAVAILABLE; }
 	virtual uint8_t get_8() const override; // get a byte
 	virtual uint16_t get_16() const override;
 	virtual uint32_t get_32() const override;
diff --git a/platform/android/file_access_filesystem_jandroid.cpp b/platform/android/file_access_filesystem_jandroid.cpp
index 46d9728632..cc7acffdad 100644
--- a/platform/android/file_access_filesystem_jandroid.cpp
+++ b/platform/android/file_access_filesystem_jandroid.cpp
@@ -53,6 +53,7 @@ jmethodID FileAccessFilesystemJAndroid::_file_write = nullptr;
 jmethodID FileAccessFilesystemJAndroid::_file_flush = nullptr;
 jmethodID FileAccessFilesystemJAndroid::_file_exists = nullptr;
 jmethodID FileAccessFilesystemJAndroid::_file_last_modified = nullptr;
+jmethodID FileAccessFilesystemJAndroid::_file_resize = nullptr;
 
 String FileAccessFilesystemJAndroid::get_path() const {
 	return path_src;
@@ -324,6 +325,27 @@ Error FileAccessFilesystemJAndroid::get_error() const {
 	return OK;
 }
 
+Error FileAccessFilesystemJAndroid::resize(int64_t p_length) {
+	if (_file_resize) {
+		JNIEnv *env = get_jni_env();
+		ERR_FAIL_NULL_V(env, FAILED);
+		ERR_FAIL_COND_V_MSG(!is_open(), FAILED, "File must be opened before use.");
+		int res = env->CallIntMethod(file_access_handler, _file_resize, id, p_length);
+		switch (res) {
+			case 0:
+				return OK;
+			case -3:
+				return ERR_INVALID_PARAMETER;
+			case -2:
+				return ERR_FILE_CANT_OPEN;
+			default:
+				return FAILED;
+		}
+	} else {
+		return ERR_UNAVAILABLE;
+	}
+}
+
 void FileAccessFilesystemJAndroid::flush() {
 	if (_file_flush) {
 		JNIEnv *env = get_jni_env();
@@ -383,6 +405,7 @@ void FileAccessFilesystemJAndroid::setup(jobject p_file_access_handler) {
 	_file_flush = env->GetMethodID(cls, "fileFlush", "(I)V");
 	_file_exists = env->GetMethodID(cls, "fileExists", "(Ljava/lang/String;)Z");
 	_file_last_modified = env->GetMethodID(cls, "fileLastModified", "(Ljava/lang/String;)J");
+	_file_resize = env->GetMethodID(cls, "fileResize", "(IJ)I");
 }
 
 void FileAccessFilesystemJAndroid::close() {
diff --git a/platform/android/file_access_filesystem_jandroid.h b/platform/android/file_access_filesystem_jandroid.h
index f33aa64ebe..4a28b6e3d5 100644
--- a/platform/android/file_access_filesystem_jandroid.h
+++ b/platform/android/file_access_filesystem_jandroid.h
@@ -52,6 +52,7 @@ class FileAccessFilesystemJAndroid : public FileAccess {
 	static jmethodID _file_close;
 	static jmethodID _file_exists;
 	static jmethodID _file_last_modified;
+	static jmethodID _file_resize;
 
 	int id;
 	String absolute_path;
@@ -76,6 +77,7 @@ public:
 
 	virtual bool eof_reached() const override; ///< reading passed EOF
 
+	virtual Error resize(int64_t p_length) override;
 	virtual uint8_t get_8() const override; ///< get a byte
 	virtual uint16_t get_16() const override;
 	virtual uint32_t get_32() const override;
diff --git a/platform/android/java/lib/src/org/godotengine/godot/io/file/DataAccess.kt b/platform/android/java/lib/src/org/godotengine/godot/io/file/DataAccess.kt
index 0f447f0b05..b155c4e488 100644
--- a/platform/android/java/lib/src/org/godotengine/godot/io/file/DataAccess.kt
+++ b/platform/android/java/lib/src/org/godotengine/godot/io/file/DataAccess.kt
@@ -36,7 +36,9 @@ import android.util.Log
 import org.godotengine.godot.io.StorageScope
 import java.io.IOException
 import java.nio.ByteBuffer
+import java.nio.channels.ClosedChannelException
 import java.nio.channels.FileChannel
+import java.nio.channels.NonWritableChannelException
 import kotlin.math.max
 
 /**
@@ -50,6 +52,11 @@ internal abstract class DataAccess(private val filePath: String) {
 	companion object {
 		private val TAG = DataAccess::class.java.simpleName
 
+		private const val OK_ERROR_ID = 0;
+		private const val FAILED_ERROR_ID = -1;
+		private const val FILE_CANT_OPEN_ERROR_ID = -2;
+		private const val INVALID_PARAMETER_ERROR_ID = -3;
+
 		fun generateDataAccess(
 			storageScope: StorageScope,
 			context: Context,
@@ -135,6 +142,21 @@ internal abstract class DataAccess(private val filePath: String) {
 		seek(positionFromBeginning)
 	}
 
+	fun resize(length: Long): Int {
+		return try {
+			fileChannel.truncate(length)
+			OK_ERROR_ID
+		} catch (e: NonWritableChannelException) {
+			FILE_CANT_OPEN_ERROR_ID
+		} catch (e: ClosedChannelException) {
+			FILE_CANT_OPEN_ERROR_ID
+		} catch (e: IllegalArgumentException) {
+			INVALID_PARAMETER_ERROR_ID
+		} catch (e: IOException) {
+			FAILED_ERROR_ID
+		}
+	}
+
 	fun position(): Long {
 		return try {
 			fileChannel.position()
diff --git a/platform/android/java/lib/src/org/godotengine/godot/io/file/FileAccessHandler.kt b/platform/android/java/lib/src/org/godotengine/godot/io/file/FileAccessHandler.kt
index 50741c1aab..6a8a10e56f 100644
--- a/platform/android/java/lib/src/org/godotengine/godot/io/file/FileAccessHandler.kt
+++ b/platform/android/java/lib/src/org/godotengine/godot/io/file/FileAccessHandler.kt
@@ -45,6 +45,7 @@ class FileAccessHandler(val context: Context) {
 	companion object {
 		private val TAG = FileAccessHandler::class.java.simpleName
 
+		private const val FAILED_ERROR_ID = -1;
 		private const val FILE_NOT_FOUND_ERROR_ID = -1
 		internal const val INVALID_FILE_ID = 0
 		private const val STARTING_FILE_ID = 1
@@ -190,6 +191,14 @@ class FileAccessHandler(val context: Context) {
 		}
 	}
 
+	fun fileResize(fileId: Int, length: Long): Int {
+		if (!hasFileId(fileId)) {
+			return FAILED_ERROR_ID
+		}
+
+		return files[fileId].resize(length)
+	}
+
 	fun fileGetPosition(fileId: Int): Long {
 		if (!hasFileId(fileId)) {
 			return 0L