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Diffstat (limited to 'internal/nametransform/diriv_cache.go')
-rw-r--r--internal/nametransform/diriv_cache.go43
1 files changed, 43 insertions, 0 deletions
diff --git a/internal/nametransform/diriv_cache.go b/internal/nametransform/diriv_cache.go
new file mode 100644
index 0000000..c6f2ca9
--- /dev/null
+++ b/internal/nametransform/diriv_cache.go
@@ -0,0 +1,43 @@
+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
+}