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