Can LittleFs read and write binary files?

Question

// File open flags
enum lfs_open_flags {
    // open flags
    LFS_O_RDONLY = 1,         // Open a file as read only
#ifndef LFS_READONLY
    LFS_O_WRONLY = 2,         // Open a file as write only
    LFS_O_RDWR   = 3,         // Open a file as read and write
    LFS_O_CREAT  = 0x0100,    // Create a file if it does not exist
    LFS_O_EXCL   = 0x0200,    // Fail if a file already exists
    LFS_O_TRUNC  = 0x0400,    // Truncate the existing file to zero size
    LFS_O_APPEND = 0x0800,    // Move to end of file on every write
#endif

    // internally used flags
#ifndef LFS_READONLY
    LFS_F_DIRTY   = 0x010000, // File does not match storage
    LFS_F_WRITING = 0x020000, // File has been written since last flush
#endif
    LFS_F_READING = 0x040000, // File has been read since last flush
#ifndef LFS_READONLY
    LFS_F_ERRED   = 0x080000, // An error occurred during write
#endif
    LFS_F_INLINE  = 0x100000, // Currently inlined in directory entry
};

Here it is read, write, and append, but can it be similar to C's fopen to open files with rb, wb binary file?

I try to use directly LFS_O_WRONLY | LFS_O_CREAT to write and use LFS_O_RDONLY to read.

Answer 1

The GitHub page says:

Once mounted, the littlefs provides a full set of POSIX-like file and directory functions...

The POSIX file function using open, read and write have no "text" mode. All files are read and written in "binary" mode.

So if LFS is "POSIX-like" then it also must do binary file reading and writing.

The text mode handling of fopen and its related reading and writing functions is done on a higher level, usually to translate OS-specific newline conventions.