#4 Fix Hash for files of size n * 9728000 bytes

closed-wont-fix
nobody
None
5
2005-11-10
2005-11-08
Dirk Meyer
No

comparing hashes with emule, some files differ.
in eMule0.46c-Sources.zip:
File "KnownFile.cpp" line 454

The lasthash ist added even if the remaining blocksize is 0

The Patch here will make this tool generate the same hashes
as emule, AOM, ed2k.c from: http://www.sdalu.com/software/

mldonkley uses the way 0.4.0 generates it hashes.

edonkey-tool-hash < 0.4.0 will crash for this problem
files.

Discussion

  • Dirk Meyer

    Dirk Meyer - 2005-11-08

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    test:
    dd if=/dev/zero of=zero.img bs=9728000 count=2
    dd if=/dev/zero of=more.img bs=9729000 count=2

    with this patch:

    $ edonkey-tool-hash -v *.img
    hashing file : more.img
    partial hash block 0: d7def262a127cd79096a108e7a9fc138
    partial hash block 1: d7def262a127cd79096a108e7a9fc138
    partial hash block 2: df58e4e45238ce2bd2e0844b3fe3fc4a
    ed2k://|file|more.img|19457800|26a1d9db7cf34b42878c287673e0f02e|
    hashing file : zero.img
    partial hash block 0: d7def262a127cd79096a108e7a9fc138
    partial hash block 1: d7def262a127cd79096a108e7a9fc138
    partial hash block 2: 31d6cfe0d16ae931b73c59d7e0c089c0
    ed2k://|file|zero.img|19456000|114b21c63a74b6ca922291a11177dd5c|

    other tools:

    $ ./ed2k *.img
    |d7def262a127cd79096a108e7a9fc138|/
    |d7def262a127cd79096a108e7a9fc138|/
    |df58e4e45238ce2bd2e0844b3fe3fc4a|/
    ED2K (more.img) = 26a1d9db7cf34b42878c287673e0f02e
    |d7def262a127cd79096a108e7a9fc138|/
    |d7def262a127cd79096a108e7a9fc138|/
    |31d6cfe0d16ae931b73c59d7e0c089c0|/
    ED2K (zero.img) = 114b21c63a74b6ca922291a11177dd5c

     
  • Dirk Meyer

    Dirk Meyer - 2005-11-08

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    user_id=181729

    The patch wworked fine under FreeBSD 4.11
    But with FreeBSD 5.4 mumap fails.
    This updated patch works around it.

     
  • Dirk Meyer

    Dirk Meyer - 2005-11-10

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    user_id=181729

    with clean hash:
    * edonkey2000 v1.4.3
    * mldonkey-2.5.30.17
    * HashCalc Version 2.01
    * edonkey-tool-hash-0.4.0

    with hashing a zero sized block
    * fsum 2.51
    * emule 0.46c
    * AOM 0.5.5.239
    * webaom v1.13
    * ed2k (Stephane D'Alu) 1.4

    So the hashes of thsi tool conforms matches the behaviour
    it was designed for without this patch.

     
  • Dirk Meyer

    Dirk Meyer - 2005-11-10
    • status: open --> closed-wont-fix
     

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