From: Duy Nguyen <pclouds@gmail.com>
To: Luke Robison <robison@arlut.utexas.edu>
Cc: Git Mailing List <git@vger.kernel.org>
Subject: Re: Understanding Binary Deltas within Packfile
Date: Tue, 20 Mar 2018 17:03:50 +0100 [thread overview]
Message-ID: <CACsJy8ABgZy=eJ7niUysb2XZ3qUr3J+jmh_5YWZ1ZDiFCrb0tA@mail.gmail.com> (raw)
In-Reply-To: <f301d093-af93-016b-79b9-3102475260cf@arlut.utexas.edu>
On Tue, Mar 20, 2018 at 4:43 PM, Luke Robison <robison@arlut.utexas.edu> wrote:
> Is there any documentation of the contents of the binary delta datain a
> packfile, and how to interpret them? I found
> https://github.com/git/git/blob/master/Documentation/technical/pack-format.txt
> documenting the packfile itself, but the "compressed delta data" seems
> largely undocumented. The source code of
> https://github.com/git/git/blob/master/diff-delta.c is pretty dense.
The output is consumed by patch_delta() in patch-delta.c if I'm not
mistaken. This function is less than 100 lines, probably much easier
to see the delta format.
> This
> is what I've got so for:
>
> +-------------+
> | Varint src_size
> | Varint trg_size
> | 1-byte inscnt
> | N-bytes up to 16 bytes of trg_buf
> |
> | A series of Operations
> |
> +-------------
>
>
> Any details on how to interpret the opcodes would be greatly appreciated.
>
> Thanks,
> Luke
>
--
Duy
next prev parent reply other threads:[~2018-03-20 16:04 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-20 15:43 Understanding Binary Deltas within Packfile Luke Robison
2018-03-20 16:03 ` Duy Nguyen [this message]
2018-03-20 18:34 ` Luke Robison
2018-03-20 19:12 ` Duy Nguyen
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