[FileAccess] Implement `resize` method.

6 files changed, 40 insertions, 0 deletions

diff --git a/drivers/unix/file_access_unix.cpp b/drivers/unix/file_access_unix.cpp
index a35d8bfdde..210507c2c6 100644
--- a/drivers/unix/file_access_unix.cpp
+++ b/drivers/unix/file_access_unix.cpp
@@ -286,6 +286,23 @@ Error FileAccessUnix::get_error() const {
 	return last_error;
 }
 
+Error FileAccessUnix::resize(int64_t p_length) {
+	ERR_FAIL_NULL_V_MSG(f, FAILED, "File must be opened before use.");
+	int res = ::ftruncate(fileno(f), p_length);
+	switch (res) {
+		case 0:
+			return OK;
+		case EBADF:
+			return ERR_FILE_CANT_OPEN;
+		case EFBIG:
+			return ERR_OUT_OF_MEMORY;
+		case EINVAL:
+			return ERR_INVALID_PARAMETER;
+		default:
+			return FAILED;
+	}
+}
+
 void FileAccessUnix::flush() {
 	ERR_FAIL_NULL_MSG(f, "File must be opened before use.");
 	fflush(f);
diff --git a/drivers/unix/file_access_unix.h b/drivers/unix/file_access_unix.h
index 553fbcf355..c0286dbff3 100644
--- a/drivers/unix/file_access_unix.h
+++ b/drivers/unix/file_access_unix.h
@@ -75,6 +75,7 @@ public:
 
 	virtual Error get_error() const override; ///< get last error
 
+	virtual Error resize(int64_t p_length) override;
 	virtual void flush() override;
 	virtual void store_8(uint8_t p_dest) override; ///< store a byte
 	virtual void store_16(uint16_t p_dest) override;
diff --git a/drivers/unix/file_access_unix_pipe.h b/drivers/unix/file_access_unix_pipe.h
index d14f897d8f..8e7988791b 100644
--- a/drivers/unix/file_access_unix_pipe.h
+++ b/drivers/unix/file_access_unix_pipe.h
@@ -70,6 +70,7 @@ public:
 
 	virtual Error get_error() const override; ///< get last error
 
+	virtual Error resize(int64_t p_length) override { return ERR_UNAVAILABLE; }
 	virtual void flush() override {}
 	virtual void store_8(uint8_t p_src) override; ///< store a byte
 	virtual void store_buffer(const uint8_t *p_src, uint64_t p_length) override; ///< store an array of bytes
diff --git a/drivers/windows/file_access_windows.cpp b/drivers/windows/file_access_windows.cpp
index dd8bceb573..726e0fdc5a 100644
--- a/drivers/windows/file_access_windows.cpp
+++ b/drivers/windows/file_access_windows.cpp
@@ -41,6 +41,7 @@
 #include <windows.h>
 
 #include <errno.h>
+#include <io.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <tchar.h>
@@ -369,6 +370,24 @@ Error FileAccessWindows::get_error() const {
 	return last_error;
 }
 
+Error FileAccessWindows::resize(int64_t p_length) {
+	ERR_FAIL_NULL_V_MSG(f, FAILED, "File must be opened before use.");
+	errno_t res = _chsize_s(_fileno(f), p_length);
+	switch (res) {
+		case 0:
+			return OK;
+		case EACCES:
+		case EBADF:
+			return ERR_FILE_CANT_OPEN;
+		case ENOSPC:
+			return ERR_OUT_OF_MEMORY;
+		case EINVAL:
+			return ERR_INVALID_PARAMETER;
+		default:
+			return FAILED;
+	}
+}
+
 void FileAccessWindows::flush() {
 	ERR_FAIL_NULL(f);
 
diff --git a/drivers/windows/file_access_windows.h b/drivers/windows/file_access_windows.h
index 173423fb06..a25bbcfb3a 100644
--- a/drivers/windows/file_access_windows.h
+++ b/drivers/windows/file_access_windows.h
@@ -77,6 +77,7 @@ public:
 
 	virtual Error get_error() const override; ///< get last error
 
+	virtual Error resize(int64_t p_length) override;
 	virtual void flush() override;
 	virtual void store_8(uint8_t p_dest) override; ///< store a byte
 	virtual void store_16(uint16_t p_dest) override;
diff --git a/drivers/windows/file_access_windows_pipe.h b/drivers/windows/file_access_windows_pipe.h
index e6abe61fa3..b885ef78e6 100644
--- a/drivers/windows/file_access_windows_pipe.h
+++ b/drivers/windows/file_access_windows_pipe.h
@@ -69,6 +69,7 @@ public:
 
 	virtual Error get_error() const override; ///< get last error
 
+	virtual Error resize(int64_t p_length) override { return ERR_UNAVAILABLE; }
 	virtual void flush() override {}
 	virtual void store_8(uint8_t p_src) override; ///< store a byte
 	virtual void store_buffer(const uint8_t *p_src, uint64_t p_length) override; ///< store an array of bytes