pack-revindex: remove unused 'find_revindex_position()'

Now that all 'find_revindex_position()' callers have been removed (and
converted to the more descriptive 'offset_to_pack_pos()'), it is almost
safe to get rid of 'find_revindex_position()' entirely. Almost, except
for the fact that 'offset_to_pack_pos()' calls
'find_revindex_position()'.

Inline 'find_revindex_position()' into 'offset_to_pack_pos()', and
then remove 'find_revindex_position()' entirely.

This is a straightforward refactoring with one minor snag.
'offset_to_pack_pos()' used to load the index before calling
'find_revindex_position()'. That means that by the time
'find_revindex_position()' starts executing, 'p->num_objects' can be
safely read. After inlining, be careful to not read 'p->num_objects'
until _after_ 'load_pack_revindex()' (which loads the index as a
side-effect) has been called.

Another small fix that is included is converting the upper- and
lower-bounds to be unsigned's instead of ints. This dates back to
92e5c77 (revindex: export new APIs, 2013-10-24)--ironically, the last
time we introduced new APIs here--but this unifies the types.

Signed-off-by: Taylor Blau <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: ttaylorr

pack-revindex.c

@@ -169,16 +169,23 @@ int load_pack_revindex(struct packed_git *p)
 	return 0;
 }
 
-int find_revindex_position(struct packed_git *p, off_t ofs)
+int offset_to_pack_pos(struct packed_git *p, off_t ofs, uint32_t *pos)
 {
-	int lo = 0;
-	int hi = p->num_objects + 1;
-	const struct revindex_entry *revindex = p->revindex;
+	unsigned lo, hi;
+	const struct revindex_entry *revindex;
+
+	if (load_pack_revindex(p) < 0)
+		return -1;
+
+	lo = 0;
+	hi = p->num_objects + 1;
+	revindex = p->revindex;
 
 	do {
 		const unsigned mi = lo + (hi - lo) / 2;
 		if (revindex[mi].offset == ofs) {
-			return mi;
+			*pos = mi;
+			return 0;
 		} else if (ofs < revindex[mi].offset)
 			hi = mi;
 		else
@@ -189,20 +196,6 @@ int find_revindex_position(struct packed_git *p, off_t ofs)
 	return -1;
 }
 
-int offset_to_pack_pos(struct packed_git *p, off_t ofs, uint32_t *pos)
-{
-	int ret;
-
-	if (load_pack_revindex(p) < 0)
-		return -1;
-
-	ret = find_revindex_position(p, ofs);
-	if (ret < 0)
-		return ret;
-	*pos = ret;
-	return 0;
-}
-
 uint32_t pack_pos_to_index(struct packed_git *p, uint32_t pos)
 {
 	if (!p->revindex)

pack-revindex.h

@@ -28,7 +28,6 @@ struct revindex_entry {
  * given pack, returning zero on success and a negative value otherwise.
  */
 int load_pack_revindex(struct packed_git *p);
-int find_revindex_position(struct packed_git *p, off_t ofs);
 
 /*
  * offset_to_pack_pos converts an object offset to a pack position. This