Type Definition gdal_sys::VSIFilesystemPluginReadCallback

pub type VSIFilesystemPluginReadCallback = Option<unsafe extern "C" fn(pFile: *mut c_void, pBuffer: *mut c_void, nSize: usize, nCount: usize) -> usize>;

Read data from current position, returns the number of blocks correctly read. Mandatory except for write only handles @since GDAL 3.0