Merge branch 'jk/pack-bitmap'

Borrow the bitmap index into packfiles from JGit to speed up
enumeration of objects involved in a commit range without having to
fully traverse the history.

* jk/pack-bitmap: (26 commits)
  ewah: unconditionally ntohll ewah data
  ewah: support platforms that require aligned reads
  read-cache: use get_be32 instead of hand-rolled ntoh_l
  block-sha1: factor out get_be and put_be wrappers
  do not discard revindex when re-preparing packfiles
  pack-bitmap: implement optional name_hash cache
  t/perf: add tests for pack bitmaps
  t: add basic bitmap functionality tests
  count-objects: recognize .bitmap in garbage-checking
  repack: consider bitmaps when performing repacks
  repack: handle optional files created by pack-objects
  repack: turn exts array into array-of-struct
  repack: stop using magic number for ARRAY_SIZE(exts)
  pack-objects: implement bitmap writing
  rev-list: add bitmap mode to speed up object lists
  pack-objects: use bitmaps when packing objects
  pack-objects: split add_object_entry
  pack-bitmap: add support for bitmap indexes
  documentation: add documentation for the bitmap format
  ewah: compressed bitmap implementation
  ...

1 files changed, 14 insertions, 2 deletions

diff --git a/Makefile b/Makefile
index c3213bd..d4ce53a 100644
--- a/Makefile
+++ b/Makefile
@@ -664,6 +664,8 @@ LIB_H += diff.h
 LIB_H += diffcore.h
 LIB_H += dir.h
 LIB_H += exec_cmd.h
+LIB_H += ewah/ewok.h
+LIB_H += ewah/ewok_rlw.h
 LIB_H += fetch-pack.h
 LIB_H += fmt-merge-msg.h
 LIB_H += fsck.h
@@ -691,8 +693,10 @@ LIB_H += notes-merge.h
 LIB_H += notes-utils.h
 LIB_H += notes.h
 LIB_H += object.h
+LIB_H += pack-objects.h
 LIB_H += pack-revindex.h
 LIB_H += pack.h
+LIB_H += pack-bitmap.h
 LIB_H += parse-options.h
 LIB_H += patch-ids.h
 LIB_H += pathspec.h
@@ -796,6 +800,10 @@ LIB_OBJS += dir.o
 LIB_OBJS += editor.o
 LIB_OBJS += entry.o
 LIB_OBJS += environment.o
+LIB_OBJS += ewah/bitmap.o
+LIB_OBJS += ewah/ewah_bitmap.o
+LIB_OBJS += ewah/ewah_io.o
+LIB_OBJS += ewah/ewah_rlw.o
 LIB_OBJS += exec_cmd.o
 LIB_OBJS += fetch-pack.o
 LIB_OBJS += fsck.o
@@ -827,7 +835,10 @@ LIB_OBJS += notes-cache.o
 LIB_OBJS += notes-merge.o
 LIB_OBJS += notes-utils.o
 LIB_OBJS += object.o
+LIB_OBJS += pack-bitmap.o
+LIB_OBJS += pack-bitmap-write.o
 LIB_OBJS += pack-check.o
+LIB_OBJS += pack-objects.o
 LIB_OBJS += pack-revindex.o
 LIB_OBJS += pack-write.o
 LIB_OBJS += pager.o
@@ -2480,8 +2491,9 @@ profile-clean:
 	$(RM) $(addsuffix *.gcno,$(addprefix $(PROFILE_DIR)/, $(object_dirs)))
 
 clean: profile-clean coverage-clean
-	$(RM) *.o *.res block-sha1/*.o ppc/*.o compat/*.o compat/*/*.o xdiff/*.o vcs-svn/*.o \
-		builtin/*.o $(LIB_FILE) $(XDIFF_LIB) $(VCSSVN_LIB)
+	$(RM) *.o *.res block-sha1/*.o ppc/*.o compat/*.o compat/*/*.o
+	$(RM) xdiff/*.o vcs-svn/*.o ewah/*.o builtin/*.o
+	$(RM) $(LIB_FILE) $(XDIFF_LIB) $(VCSSVN_LIB)
 	$(RM) $(ALL_PROGRAMS) $(SCRIPT_LIB) $(BUILT_INS) git$X
 	$(RM) $(TEST_PROGRAMS) $(NO_INSTALL)
 	$(RM) -r bin-wrappers $(dep_dirs)