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-rw-r--r--name-hash.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/name-hash.c b/name-hash.c
new file mode 100644
index 000000000..e56eb16c2
--- /dev/null
+++ b/name-hash.c
@@ -0,0 +1,73 @@
+/*
+ * name-hash.c
+ *
+ * Hashing names in the index state
+ *
+ * Copyright (C) 2008 Linus Torvalds
+ */
+#define NO_THE_INDEX_COMPATIBILITY_MACROS
+#include "cache.h"
+
+static unsigned int hash_name(const char *name, int namelen)
+{
+ unsigned int hash = 0x123;
+
+ do {
+ unsigned char c = *name++;
+ hash = hash*101 + c;
+ } while (--namelen);
+ return hash;
+}
+
+static void hash_index_entry(struct index_state *istate, struct cache_entry *ce)
+{
+ void **pos;
+ unsigned int hash;
+
+ if (ce->ce_flags & CE_HASHED)
+ return;
+ ce->ce_flags |= CE_HASHED;
+ ce->next = NULL;
+ hash = hash_name(ce->name, ce_namelen(ce));
+ pos = insert_hash(hash, ce, &istate->name_hash);
+ if (pos) {
+ ce->next = *pos;
+ *pos = ce;
+ }
+}
+
+static void lazy_init_name_hash(struct index_state *istate)
+{
+ int nr;
+
+ if (istate->name_hash_initialized)
+ return;
+ for (nr = 0; nr < istate->cache_nr; nr++)
+ hash_index_entry(istate, istate->cache[nr]);
+ istate->name_hash_initialized = 1;
+}
+
+void add_name_hash(struct index_state *istate, struct cache_entry *ce)
+{
+ ce->ce_flags &= ~CE_UNHASHED;
+ if (istate->name_hash_initialized)
+ hash_index_entry(istate, ce);
+}
+
+int index_name_exists(struct index_state *istate, const char *name, int namelen)
+{
+ unsigned int hash = hash_name(name, namelen);
+ struct cache_entry *ce;
+
+ lazy_init_name_hash(istate);
+ ce = lookup_hash(hash, &istate->name_hash);
+
+ while (ce) {
+ if (!(ce->ce_flags & CE_UNHASHED)) {
+ if (!cache_name_compare(name, namelen, ce->name, ce->ce_flags))
+ return 1;
+ }
+ ce = ce->next;
+ }
+ return 0;
+}