ESP32 SD storage doesn't use SD.rename method to rename a file

[Mark B. Jones aka The Scuba Hacker]

For the use case of ESP32 using SD storage: (particularly an issue for files that are very large, eg tens of MB like large wav files used in audio player use-case)

In FTPServer.h the rename file method is not using the SD.rename method and instead the code makes a complete copy of the file, which is particularly an issue for large files as the copy method of rename takes a long time and hangs the FTP client, causing a disconnect. (Both Cyberduck and FileZilla).

(I can't get the code block to allow newlines...)

I needed to make two changes:

FTPServer.h

Existing code in FTPServer.h:

#if STORAGE_TYPE == STORAGE_SD || STORAGE_TYPE == STORAGE_SD_MMC
bool rename( const char * path, const char * newpath );
#else
bool rename( const char * path, const char * newpath ) { return STORAGE_MANAGER.rename( path, newpath ); };
#endif

Code change:

#if (STORAGE_TYPE == STORAGE_SD || STORAGE_TYPE == STORAGE_SD_MMC)
#if defined(ESP32))
bool rename( const char * path, const char * newpath ) { return STORAGE_MANAGER.rename( path, newpath ); };
#else
bool rename( const char * path, const char * newpath );
#endif
#else
bool rename( const char * path, const char * newpath ) { return STORAGE_MANAGER.rename( path, newpath ); };
#endif

FTPServer.cpp

Existing code:

#if (STORAGE_TYPE == STORAGE_SD || STORAGE_TYPE == STORAGE_SD_MMC)
bool FtpServer::rename( const char * path, const char * newpath ){
FTP_FILE myFileIn = STORAGE_MANAGER.open(path, FILE_READ);
FTP_FILE myFileOut = STORAGE_MANAGER.open(newpath, FILE_WRITE);

Code change:

#if !defined(ESP32) && (STORAGE_TYPE == STORAGE_SD || STORAGE_TYPE == STORAGE_SD_MMC)
bool FtpServer::rename( const char * path, const char * newpath ){
FTP_FILE myFileIn = STORAGE_MANAGER.open(path, FILE_READ);
FTP_FILE myFileOut = STORAGE_MANAGER.open(newpath, FILE_WRITE);

[Renzo Mischianti]

I add the change, thanks scuba.

[Mark B. Jones aka The Scuba Hacker]

Nice one, thanks @xreef for a great library. I find it the easiest way to get files uploaded to the Adafruit SPI Flash SD Card (which uses onboard flash and presents it as though it had a physical SD card).