Function getFileSize

Core/MemoryFile.cpp:428–435

#ifndef MMKV_APPLE

bool getFileSize(int fd, size_t &size) {
    struct stat st = {};
    if (fstat(fd, &st) != -1) {
        size = (size_t) st.st_size;
        return true;
    }
    return false;
}

bool getFileSize(const char *path, size_t &size) {
    struct stat st = {};