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package nametransform
import "sync"
// A simple one-entry DirIV cache
type dirIVCache struct {
// Invalidated?
cleared bool
// The DirIV
iv []byte
// Directory the DirIV belongs to
dir string
// Ecrypted version of "dir"
translatedDir string
// Synchronisation
lock sync.RWMutex
}
// lookup - fetch entry for "dir" from the cache
func (c *dirIVCache) lookup(dir string) (bool, []byte, string) {
c.lock.RLock()
defer c.lock.RUnlock()
if !c.cleared && c.dir == dir {
return true, c.iv, c.translatedDir
}
return false, nil, ""
}
// store - write entry for "dir" into the caches
func (c *dirIVCache) store(dir string, iv []byte, translatedDir string) {
c.lock.Lock()
defer c.lock.Unlock()
c.cleared = false
c.iv = iv
c.dir = dir
c.translatedDir = translatedDir
}
func (c *dirIVCache) Clear() {
c.lock.Lock()
defer c.lock.Unlock()
c.cleared = true
}
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