5 files changed, 22 insertions, 15 deletions
diff --git a/core/core_bind.cpp b/core/core_bind.cpp
index 2f5d7cb081..63238e3029 100644
--- a/core/core_bind.cpp
+++ b/core/core_bind.cpp
@@ -390,7 +390,7 @@ int64_t _OS::get_unix_time_from_datetime(Dictionary datetime) const {
 	unsigned int hour = ((datetime.has(HOUR_KEY)) ? static_cast<unsigned int>(datetime[HOUR_KEY]) : 0);
 	unsigned int day = ((datetime.has(DAY_KEY)) ? static_cast<unsigned int>(datetime[DAY_KEY]) : 1);
 	unsigned int month = ((datetime.has(MONTH_KEY)) ? static_cast<unsigned int>(datetime[MONTH_KEY]) : 1);
-	unsigned int year = ((datetime.has(YEAR_KEY)) ? static_cast<unsigned int>(datetime[YEAR_KEY]) : 0);
+	unsigned int year = ((datetime.has(YEAR_KEY)) ? static_cast<unsigned int>(datetime[YEAR_KEY]) : 1970);
 
 	/// How many days come before each month (0-12)
 	static const unsigned short int DAYS_PAST_THIS_YEAR_TABLE[2][13] = {
@@ -401,15 +401,14 @@ int64_t _OS::get_unix_time_from_datetime(Dictionary datetime) const {
 	};
 
 	ERR_FAIL_COND_V_MSG(second > 59, 0, "Invalid second value of: " + itos(second) + ".");
-
 	ERR_FAIL_COND_V_MSG(minute > 59, 0, "Invalid minute value of: " + itos(minute) + ".");
-
 	ERR_FAIL_COND_V_MSG(hour > 23, 0, "Invalid hour value of: " + itos(hour) + ".");
-
+	ERR_FAIL_COND_V_MSG(year == 0, 0, "Years before 1 AD are not supported. Value passed: " + itos(year) + ".");
 	ERR_FAIL_COND_V_MSG(month > 12 || month == 0, 0, "Invalid month value of: " + itos(month) + ".");
-
 	// Do this check after month is tested as valid
-	ERR_FAIL_COND_V_MSG(day > MONTH_DAYS_TABLE[LEAPYEAR(year)][month - 1] || day == 0, 0, "Invalid day value of '" + itos(day) + "' which is larger than '" + itos(MONTH_DAYS_TABLE[LEAPYEAR(year)][month - 1]) + "' or 0.");
+	unsigned int days_in_month = MONTH_DAYS_TABLE[LEAPYEAR(year)][month - 1];
+	ERR_FAIL_COND_V_MSG(day == 0 || day > days_in_month, 0, "Invalid day value of: " + itos(day) + ". It should be comprised between 1 and " + itos(days_in_month) + " for month " + itos(month) + ".");
+
 	// Calculate all the seconds from months past in this year
 	uint64_t SECONDS_FROM_MONTHS_PAST_THIS_YEAR = DAYS_PAST_THIS_YEAR_TABLE[LEAPYEAR(year)][month - 1] * SECONDS_PER_DAY;
 
diff --git a/core/io/file_access_pack.h b/core/io/file_access_pack.h
index e47c9ea543..763c0fb327 100644
--- a/core/io/file_access_pack.h
+++ b/core/io/file_access_pack.h
@@ -245,6 +245,10 @@ public:
 
 	uint64_t get_space_left();
 
+	virtual bool is_link(String p_file) { return false; }
+	virtual String read_link(String p_file) { return p_file; }
+	virtual Error create_link(String p_source, String p_target) { return FAILED; }
+
 	virtual String get_filesystem_type() const;
 
 	DirAccessPack();
diff --git a/core/io/file_access_zip.cpp b/core/io/file_access_zip.cpp
index 304e24ee90..d7ff1b7e00 100644
--- a/core/io/file_access_zip.cpp
+++ b/core/io/file_access_zip.cpp
@@ -226,9 +226,7 @@ ZipArchive::ZipArchive() {
 
 ZipArchive::~ZipArchive() {
 	for (int i = 0; i < packages.size(); i++) {
-		FileAccess *f = (FileAccess *)unzGetOpaque(packages[i].zfile);
 		unzClose(packages[i].zfile);
-		memdelete(f);
 	}
 
 	packages.clear();
diff --git a/core/os/dir_access.cpp b/core/os/dir_access.cpp
index b7c3a17ba9..39ae475c12 100644
--- a/core/os/dir_access.cpp
+++ b/core/os/dir_access.cpp
@@ -331,7 +331,7 @@ public:
 	}
 };
 
-Error DirAccess::_copy_dir(DirAccess *p_target_da, String p_to, int p_chmod_flags) {
+Error DirAccess::_copy_dir(DirAccess *p_target_da, String p_to, int p_chmod_flags, bool p_copy_links) {
 	List<String> dirs;
 
 	String curdir = get_current_dir();
@@ -339,7 +339,9 @@ Error DirAccess::_copy_dir(DirAccess *p_target_da, String p_to, int p_chmod_flag
 	String n = get_next();
 	while (n != String()) {
 		if (n != "." && n != "..") {
-			if (current_is_dir()) {
+			if (p_copy_links && is_link(get_current_dir().plus_file(n))) {
+				create_link(read_link(get_current_dir().plus_file(n)), p_to + n);
+			} else if (current_is_dir()) {
 				dirs.push_back(n);
 			} else {
 				const String &rel_path = n;
@@ -371,7 +373,7 @@ Error DirAccess::_copy_dir(DirAccess *p_target_da, String p_to, int p_chmod_flag
 		Error err = change_dir(E->get());
 		ERR_FAIL_COND_V_MSG(err != OK, err, "Cannot change current directory to '" + E->get() + "'.");
 
-		err = _copy_dir(p_target_da, p_to + rel_path + "/", p_chmod_flags);
+		err = _copy_dir(p_target_da, p_to + rel_path + "/", p_chmod_flags, p_copy_links);
 		if (err) {
 			change_dir("..");
 			ERR_FAIL_V_MSG(err, "Failed to copy recursively.");
@@ -383,7 +385,7 @@ Error DirAccess::_copy_dir(DirAccess *p_target_da, String p_to, int p_chmod_flag
 	return OK;
 }
 
-Error DirAccess::copy_dir(String p_from, String p_to, int p_chmod_flags) {
+Error DirAccess::copy_dir(String p_from, String p_to, int p_chmod_flags, bool p_copy_links) {
 	ERR_FAIL_COND_V_MSG(!dir_exists(p_from), ERR_FILE_NOT_FOUND, "Source directory doesn't exist.");
 
 	DirAccess *target_da = DirAccess::create_for_path(p_to);
@@ -402,7 +404,7 @@ Error DirAccess::copy_dir(String p_from, String p_to, int p_chmod_flags) {
 	}
 
 	DirChanger dir_changer(this, p_from);
-	Error err = _copy_dir(target_da, p_to, p_chmod_flags);
+	Error err = _copy_dir(target_da, p_to, p_chmod_flags, p_copy_links);
 	memdelete(target_da);
 
 	return err;
diff --git a/core/os/dir_access.h b/core/os/dir_access.h
index ec738d30d5..16154a4850 100644
--- a/core/os/dir_access.h
+++ b/core/os/dir_access.h
@@ -50,7 +50,7 @@ private:
 	AccessType _access_type = ACCESS_FILESYSTEM;
 	static CreateFunc create_func[ACCESS_MAX]; ///< set this to instance a filesystem object
 
-	Error _copy_dir(DirAccess *p_target_da, String p_to, int p_chmod_flags);
+	Error _copy_dir(DirAccess *p_target_da, String p_to, int p_chmod_flags, bool p_copy_links);
 
 protected:
 	String _get_root_path() const;
@@ -89,11 +89,15 @@ public:
 	static bool exists(String p_dir);
 	virtual uint64_t get_space_left() = 0;
 
-	Error copy_dir(String p_from, String p_to, int p_chmod_flags = -1);
+	Error copy_dir(String p_from, String p_to, int p_chmod_flags = -1, bool p_copy_links = false);
 	virtual Error copy(String p_from, String p_to, int p_chmod_flags = -1);
 	virtual Error rename(String p_from, String p_to) = 0;
 	virtual Error remove(String p_name) = 0;
 
+	virtual bool is_link(String p_file) = 0;
+	virtual String read_link(String p_file) = 0;
+	virtual Error create_link(String p_source, String p_target) = 0;
+
 	// Meant for editor code when we want to quickly remove a file without custom
 	// handling (e.g. removing a cache file).
 	static void remove_file_or_error(String p_path) {