package fusefrontend // Helper functions for sparse files (files with holes) import ( "github.com/hanwen/go-fuse/fuse" "github.com/rfjakob/gocryptfs/internal/tlog" ) // Will a write to offset "off" create a file hole? func (f *file) createsHole(plainSize uint64, off int64) bool { nextBlock := f.contentEnc.PlainOffToBlockNo(plainSize) targetBlock := f.contentEnc.PlainOffToBlockNo(uint64(off)) if targetBlock > nextBlock { return true } return false } // Zero-pad the file of size plainSize to the next block boundary func (f *file) zeroPad(plainSize uint64) fuse.Status { lastBlockLen := plainSize % f.contentEnc.PlainBS() missing := f.contentEnc.PlainBS() - lastBlockLen pad := make([]byte, missing) tlog.Debug.Printf("zeroPad: Writing %d bytes\n", missing) _, status := f.doWrite(pad, int64(plainSize)) return status }