1 files changed, 129 insertions, 0 deletions
diff --git a/sha1-lookup.c b/sha1-lookup.c
new file mode 100644
index 000000000000..796ab68da83c
--- /dev/null
+++ b/sha1-lookup.c
@@ -0,0 +1,129 @@
+#include "cache.h"
+#include "sha1-lookup.h"
+
+static uint32_t take2(const unsigned char *sha1)
+{
+	return ((sha1[0] << 8) | sha1[1]);
+}
+
+/*
+ * Conventional binary search loop looks like this:
+ *
+ *      do {
+ *              int mi = lo + (hi - lo) / 2;
+ *              int cmp = "entry pointed at by mi" minus "target";
+ *              if (!cmp)
+ *                      return (mi is the wanted one)
+ *              if (cmp > 0)
+ *                      hi = mi; "mi is larger than target"
+ *              else
+ *                      lo = mi+1; "mi is smaller than target"
+ *      } while (lo < hi);
+ *
+ * The invariants are:
+ *
+ * - When entering the loop, lo points at a slot that is never
+ *   above the target (it could be at the target), hi points at a
+ *   slot that is guaranteed to be above the target (it can never
+ *   be at the target).
+ *
+ * - We find a point 'mi' between lo and hi (mi could be the same
+ *   as lo, but never can be the same as hi), and check if it hits
+ *   the target.  There are three cases:
+ *
+ *    - if it is a hit, we are happy.
+ *
+ *    - if it is strictly higher than the target, we update hi with
+ *      it.
+ *
+ *    - if it is strictly lower than the target, we update lo to be
+ *      one slot after it, because we allow lo to be at the target.
+ *
+ * When choosing 'mi', we do not have to take the "middle" but
+ * anywhere in between lo and hi, as long as lo <= mi < hi is
+ * satisfied.  When we somehow know that the distance between the
+ * target and lo is much shorter than the target and hi, we could
+ * pick mi that is much closer to lo than the midway.
+ */
+/*
+ * The table should contain "nr" elements.
+ * The sha1 of element i (between 0 and nr - 1) should be returned
+ * by "fn(i, table)".
+ */
+int sha1_pos(const unsigned char *sha1, void *table, size_t nr,
+	     sha1_access_fn fn)
+{
+	size_t hi = nr;
+	size_t lo = 0;
+	size_t mi = 0;
+
+	if (!nr)
+		return -1;
+
+	if (nr != 1) {
+		size_t lov, hiv, miv, ofs;
+
+		for (ofs = 0; ofs < 18; ofs += 2) {
+			lov = take2(fn(0, table) + ofs);
+			hiv = take2(fn(nr - 1, table) + ofs);
+			miv = take2(sha1 + ofs);
+			if (miv < lov)
+				return -1;
+			if (hiv < miv)
+				return -1 - nr;
+			if (lov != hiv) {
+				/*
+				 * At this point miv could be equal
+				 * to hiv (but sha1 could still be higher);
+				 * the invariant of (mi < hi) should be
+				 * kept.
+				 */
+				mi = (nr - 1) * (miv - lov) / (hiv - lov);
+				if (lo <= mi && mi < hi)
+					break;
+				BUG("assertion failed in binary search");
+			}
+		}
+	}
+
+	do {
+		int cmp;
+		cmp = hashcmp(fn(mi, table), sha1);
+		if (!cmp)
+			return mi;
+		if (cmp > 0)
+			hi = mi;
+		else
+			lo = mi + 1;
+		mi = lo + (hi - lo) / 2;
+	} while (lo < hi);
+	return -lo-1;
+}
+
+int bsearch_hash(const unsigned char *sha1, const uint32_t *fanout_nbo,
+		 const unsigned char *table, size_t stride, uint32_t *result)
+{
+	uint32_t hi, lo;
+
+	hi = ntohl(fanout_nbo[*sha1]);
+	lo = ((*sha1 == 0x0) ? 0 : ntohl(fanout_nbo[*sha1 - 1]));
+
+	while (lo < hi) {
+		unsigned mi = lo + (hi - lo) / 2;
+		int cmp = hashcmp(table + mi * stride, sha1);
+
+		if (!cmp) {
+			if (result)
+				*result = mi;
+			return 1;
+		}
+		if (cmp > 0)
+			hi = mi;
+		else
+			lo = mi + 1;
+	}
+
+	if (result)
+		*result = lo;
+	return 0;
+}