+static int locate_object_entry_hash(const unsigned char *sha1)
+{
+ int i;
+ unsigned int ui;
+ memcpy(&ui, sha1, sizeof(unsigned int));
+ i = ui % object_ix_hashsz;
+ while (0 < object_ix[i]) {
+ if (!memcmp(sha1, objects[object_ix[i]-1].sha1, 20))
+ return i;
+ if (++i == object_ix_hashsz)
+ i = 0;
+ }
+ return -1 - i;
+}
+
+static struct object_entry *locate_object_entry(const unsigned char *sha1)
+{
+ int i;
+
+ if (!object_ix_hashsz)
+ return NULL;
+
+ i = locate_object_entry_hash(sha1);
+ if (0 <= i)
+ return &objects[object_ix[i]-1];
+ return NULL;
+}
+
+static void rehash_objects(void)
+{
+ int i;
+ struct object_entry *oe;
+
+ object_ix_hashsz = nr_objects * 3;
+ if (object_ix_hashsz < 1024)
+ object_ix_hashsz = 1024;
+ object_ix = xrealloc(object_ix, sizeof(int) * object_ix_hashsz);
+ object_ix = memset(object_ix, 0, sizeof(int) * object_ix_hashsz);
+ for (i = 0, oe = objects; i < nr_objects; i++, oe++) {
+ int ix = locate_object_entry_hash(oe->sha1);
+ if (0 <= ix)
+ continue;
+ ix = -1 - ix;
+ object_ix[ix] = i + 1;
+ }
+}
+
+struct name_path {
+ struct name_path *up;
+ const char *elem;
+ int len;
+};
+
+#define DIRBITS 12
+
+static unsigned name_hash(struct name_path *path, const char *name)
+{
+ struct name_path *p = path;
+ const char *n = name + strlen(name);
+ unsigned hash = 0, name_hash = 0, name_done = 0;
+
+ if (n != name && n[-1] == '\n')
+ n--;
+ while (name <= --n) {
+ unsigned char c = *n;
+ if (c == '/' && !name_done) {
+ name_hash = hash;
+ name_done = 1;
+ hash = 0;
+ }
+ hash = hash * 11 + c;
+ }
+ if (!name_done) {
+ name_hash = hash;
+ hash = 0;
+ }
+ for (p = path; p; p = p->up) {
+ hash = hash * 11 + '/';
+ n = p->elem + p->len;
+ while (p->elem <= --n) {
+ unsigned char c = *n;
+ hash = hash * 11 + c;
+ }
+ }
+ /*
+ * Make sure "Makefile" and "t/Makefile" are hashed separately
+ * but close enough.
+ */
+ hash = (name_hash<<DIRBITS) | (hash & ((1U<<DIRBITS )-1));
+
+ if (0) { /* debug */
+ n = name + strlen(name);
+ if (n != name && n[-1] == '\n')
+ n--;
+ while (name <= --n)
+ fputc(*n, stderr);
+ for (p = path; p; p = p->up) {
+ fputc('/', stderr);
+ n = p->elem + p->len;
+ while (p->elem <= --n)
+ fputc(*n, stderr);
+ }
+ fprintf(stderr, "\t%08x\n", hash);
+ }
+ return hash;
+}
+
+static int add_object_entry(const unsigned char *sha1, unsigned hash, int exclude)