func (self CachedMd5Comparer) md5(local *drive.LocalFile) string {
// See if file exist in cache
cached, found := self.cache[local.AbsPath()]
// If found and modification time and size has not changed, return cached md5
if found && local.Modified().UnixNano() == cached.Modified && local.Size() == cached.Size {
return cached.Md5
}
// Calculate new md5 sum
md5 := md5sum(local.AbsPath())
// Cache file info if file meets size criteria
if local.Size() > MinCacheFileSize {
self.cacheAdd(local, md5)
self.persist()
}
return md5
}
func (self CachedMd5Comparer) cacheAdd(lf *drive.LocalFile, md5 string) {
self.cache[lf.AbsPath()] = &CachedFileInfo{
Size: lf.Size(),
Modified: lf.Modified().UnixNano(),
Md5: md5,
}
}
func (self Md5Comparer) Changed(local *drive.LocalFile, remote *drive.RemoteFile) bool {
return remote.Md5() != md5sum(local.AbsPath())
}