[Bug find-debuginfo/33771] Use ddpt or gnu dd iflag=skip_bytes,count_bytes for ar member extraction

[mark at klomp dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=33771

Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #3 from Mark Wielaard <mark at klomp dot org> ---
commit 718c9906abe67c7f244ee1ceff2f5759736b9bde
Author: Mark Wielaard <mark@klomp.org>
Date:   Wed Jan 14 00:25:35 2026 +0100

    find-debuginfo: Use 64k buffers to extract ar members with dd

    If the dd implemention support the skip_bytes and count_bytes iflags
    then use them with a blocksize of 64k. skip_bytes will use bytes to
    skip and count_bytes will use bytes for count. Otherwise we have to
    use bs=1 because skip and count would be interpreted as the number of
    blocks (to skip or copy). Using a blocksize of 64k will speed up dd
    processing. Also allow much more members to be extracted if we have a
    fast dd.

    https://sourceware.org/bugzilla/show_bug.cgi?id=33771

    Suggested-by: Ben Beasley <code@musicinmybrain.net>
    Signed-off-by: Mark Wielaard <mark@klomp.org>

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