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Commits on Jul 13, 2006
  1. Remove TYPE_* constant macros and use object_type enums consistently.

    Linus Torvalds committed with Junio C Hamano Jul 11, 2006
    This updates the type-enumeration constants introduced to reduce
    the memory footprint of "struct object" to match the type bits
    already used in the packfile format, by removing the former
    (i.e. TYPE_* constant macros) and using the latter (i.e. enum
    object_type) throughout the code for consistency.
    Eventually we can stop passing around the "type strings"
    entirely, and this will help - no confusion about two different
    integer enumeration.
    Signed-off-by: Linus Torvalds <>
    Signed-off-by: Junio C Hamano <>
Commits on Feb 17, 2006
  1. pack-objects: reuse data from existing packs.

    Junio C Hamano committed Feb 15, 2006
    When generating a new pack, notice if we have already needed
    objects in existing packs.  If an object is stored deltified,
    and its base object is also what we are going to pack, then
    reuse the existing deltified representation unconditionally,
    bypassing all the expensive find_deltas() and try_deltas()
    Also, notice if what we are going to write out exactly match
    what is already in an existing pack (either deltified or just
    compressed).  In such a case, we can just copy it instead of
    going through the usual uncompressing & recompressing cycle.
    Without this patch, in linux-2.6 repository with about 1500
    loose objects and a single mega pack:
        $ git-rev-list --objects v2.6.16-rc3 >RL
        $ wc -l RL
        184141 RL
        $ time git-pack-objects p <RL
        Generating pack...
        Done counting 184141 objects.
        Packing 184141 objects....................
        real    12m4.323s
        user    11m2.560s
        sys     0m55.950s
    With this patch, the same input:
        $ time ../git.junio/git-pack-objects q <RL
        Generating pack...
        Done counting 184141 objects.
        Packing 184141 objects.....................
        Total 184141, written 184141, reused 182441
        real    1m2.608s
        user    0m55.090s
        sys     0m1.830s
    Signed-off-by: Junio C Hamano <>
Commits on Feb 10, 2006
  1. remove delta-against-self bit

    Nicolas Pitre committed with Junio C Hamano Feb 9, 2006
    After experimenting with code to add the ability to encode a delta
    against part of the deltified file, it turns out that resulting packs
    are _bigger_ than when this ability is not used.  The raw delta output
    might be smaller, but it doesn't compress as well using gzip with a
    negative net saving on average.
    Said bit would in fact be more useful to allow for encoding the copying
    of chunks larger than 64KB providing more savings with large files.
    This will correspond to packs version 3.
    While the current code still produces packs version 2, it is made future
    proof so pack versions 2 and 3 are accepted.  Any pack version 2 are
    compatible with version 3 since the redefined bit was never used before.
    When enough time has passed, code to use that bit to produce version 3
    packs could be added.
    Signed-off-by: Nicolas Pitre <>
    Signed-off-by: Junio C Hamano <>
Commits on Jul 1, 2005
  1. [PATCH] verify-pack updates.

    Junio C Hamano committed with Linus Torvalds Jun 30, 2005
    Nico pointed out that having verify_pack.c and verify-pack.c was
    confusing.  Rename verify_pack.c to pack-check.c as suggested,
    and enhances the verification done quite a bit.
     - Built-in sha1_file unpacking knows that a base object of a
       deltified object _must_ be in the same pack, and takes
       advantage of that fact.
     - Earlier verify-pack command only checked the SHA1 sum for the
       entire pack file and did not look into its contents.  It now
       checks everything idx file claims to have unpacks correctly.
     - It now has a hook to give more detailed information for
       objects contained in the pack under -v flag.
    Signed-off-by: Junio C Hamano <>
    Signed-off-by: Linus Torvalds <>
Commits on Jun 29, 2005
  1. [PATCH] Add git-verify-pack command.

    Junio C Hamano committed with Linus Torvalds Jun 29, 2005
    Given a list of <pack>.idx files, this command validates the
    index file and the corresponding .pack file for consistency.
    This patch also uses the same validation mechanism in fsck-cache
    when the --full flag is used.
    During normal operation, sha1_file.c verifies that a given .idx
    file matches the .pack file by comparing the SHA1 checksum
    stored in .idx file and .pack file as a minimum sanity check.
    We may further want to check the pack signature and version when
    we map the pack, but that would be a separate patch.
    Earlier, errors to map a pack file was not flagged fatal but led
    to a random fatal error later.  This version explicitly die()s
    when such an error is detected.
    Signed-off-by: Junio C Hamano <>
    Signed-off-by: Linus Torvalds <>
  2. Make git pack files use little-endian size encoding

    Linus Torvalds committed Jun 28, 2005
    This makes it match the new delta encoding, and admittedly makes the
    code easier to follow.
    This also updates the PACK file version to 2, since this (and the delta
    encoding change in the previous commit) are incompatible with the old
Commits on Jun 28, 2005
  1. Change pack file format. Hopefully for the last time.

    Linus Torvalds committed Jun 28, 2005
    This also adds a header with a signature, version info, and the number
    of objects to the pack file.  It also encodes the file length and type
    more efficiently.
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