[PATCH 00/21] np/pack-v4 updates

This contains fixups for some of my patches, some of Nico's, adds v4 support to unpack-objects because the test suite needs it. With these, when force generating pack v4 unconditionally, the remaining failed tests are:

 - t5300-pack-object: ofs-delta tests fail (not surprising).
   core.packsizelimit also fails. Kinda expected, but not my top
   priority.

 - t5302-pack-index: mainly to test .idx v2, expected

 - t5303-pack-corruption-resilience: if I force generating .idx v2
   with .pack v4, I could get to 1/3 of it. Need a deeper look.

So v4 code is in pretty good shape in terms of correctness and near function complete. Brave souls should try it out.

Nguyễn Thái Ngọc Duy (21):
  fixup! pack-objects: prepare SHA-1 table in v4
  fixup! pack-objects: support writing pack v4
  fixup! pack v4: support "end-of-pack" indicator in index-pack and pack-objects
  fixup! index-pack: parse v4 header and dictionaries
  fixup! index-pack: record all delta bases in v4 (tree and ref-delta)
  pack v4: lift dict size check in load_dict()
  pack v4: move pv4 objhdr parsing code to packv4-parse.c
  pack-objects: respect compression level in v4
  pack-objects: recognize v4 as pack source
  pack v4: add a note that streaming does not support OBJ_PV4_*
  unpack-objects: report missing object name
  unpack-objects: recognize end-of-pack in v4 thin pack
  unpack-objects: read v4 dictionaries
  unpack-objects: decode v4 object header
  unpack-objects: decode v4 ref-delta
  unpack-objects: decode v4 commits
  unpack-objects: allow to save processed bytes to a buffer
  unpack-objects: decode v4 trees
  index-pack, pack-objects: allow creating .idx v2 with .pack v4
  show-index: acknowledge that it does not read .idx v3
  t1050, t5500: replace the use of "show-index|wc -l" with verify-pack

 builtin/index-pack.c     |  19 ++-
 builtin/pack-objects.c   |  60 +++++--
 builtin/unpack-objects.c | 395 ++++++++++++++++++++++++++++++++++++++++++++---
 packv4-create.c          |  17 +-
 packv4-create.h          |   6 +-
 packv4-parse.c           |  16 +-
 packv4-parse.h           |   7 +
 sha1_file.c              |   9 +-
 show-index.c             |   4 +-
 streaming.c              |   2 +-
 t/t1050-large.sh         |   9 +-
 t/t5500-fetch-pack.sh    |   4 +-
 test-packv4.c            |   9 +-
 13 files changed, 480 insertions(+), 77 deletions(-)