GNU logs - #78799, boring messages


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Zip created by pigz[1] is deemed to be corrupted even though it is consider=
ed valid by unzip et alli [2].   I do not claim pigz&#39;s zip is correct b=
ut other un/zippers think so. Apparently it is mentioned in paragraph 4.3.9=
.3 of ZIP File Format Specification [3][4].   4.3.9.3 Although not original=
ly assigned a signature, the value=C2=A0  0x08074b50 has commonly been adop=
ted as a signature value=C2=A0  for the data descriptor record.=C2=A0 Imple=
menters SHOULD be=C2=A0  aware that ZIP files MAY be encountered with or wi=
thout this=C2=A0  signature marking data descriptors and SHOULD account for=
  either case when reading ZIP files to ensure compatibility.   Also made a=
 script that shows that in practice (attached).   If you find this zip corr=
ect make gzip aware of it, if otherwise you find it incorrect else let me k=
now, I may raise in pigz issues.   Regards.   --   1.  github.com https://g=
ithub.com/madler/pigz   2. unzip, doublecmd, totalcmd, 7zip, winrar, and li=
kely others   3.  pkware.cachefly.net https://pkware.cachefly.net/webdocs/c=
asestudies/APPNOTE.TXT   4.  sourceforge.net https://sourceforge.net/p/seve=
nzip/bugs/2416/#84d4=0D

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<div><span style=3D"color: var(--newhope-colors-gray-100); font-size: var(-=
-font-sizes-md); font-weight: var(--font-weights-normal); letter-spacing: v=
ar(--letter-spacings-base);">Zip created by pigz[1] is deemed to be corrupt=
ed even though it is considered valid by unzip et alli [2].</span><br></div=
><div><br></div><div>I do not claim pigz's zip is correct but other un/zipp=
ers think so. Apparently it is mentioned in paragraph 4.3.9.3 of ZIP File F=
ormat Specification [3][4].<br></div><div><br></div><div>4.3.9.3 Although n=
ot originally assigned a signature, the value&nbsp;<br></div><div>0x08074b5=
0 has commonly been adopted as a signature value&nbsp;<br></div><div>for th=
e data descriptor record.&nbsp; Implementers SHOULD be&nbsp;<br></div><div>=
aware that ZIP files MAY be encountered with or without this&nbsp;<br></div=
><div>signature marking data descriptors and SHOULD account for<br></div><d=
iv>either case when reading ZIP files to ensure compatibility.<br></div><di=
v><br></div><div>Also made a script that shows that in practice (attached).=
<br></div><div><br></div><div>If you find this zip correct make gzip aware =
of it, if otherwise you find it incorrect else let me know, I may raise in =
pigz issues.<br></div><div><br></div><div>Regards.<br></div><div><br></div>=
<div>--<br></div><div><br></div><div>1. <a href=3D"https://github.com/madle=
r/pigz">https://github.com/madler/pigz</a><br></div><div><br></div><div>2. =
unzip, doublecmd, totalcmd, 7zip, winrar, and likely others<br></div><div><=
br></div><div>3. <a href=3D"https://pkware.cachefly.net/webdocs/casestudies=
/APPNOTE.TXT">https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT</=
a><br></div><div><br></div><div>4. <a href=3D"https://sourceforge.net/p/sev=
enzip/bugs/2416/#84d4">https://sourceforge.net/p/sevenzip/bugs/2416/#84d4</=
a><br></div><div><br></div><div><br></div><br><div><br></div>
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X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: oset <oset@HIDDEN>
Subject: bug#78799: Acknowledgement (Zip created by pigz is deemed to be
 corrupted)
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Date: Sun, 15 Jun 2025 14:00:05 +0000

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From: "Adler, Mark" <madler@HIDDEN>
Thread-Topic: bug#78799: Zip created by pigz is deemed to be corrupted
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--_000_1DBF83ECD7F54FB992ECE8E65C8CEFD7alumnicaltechedu_--

--_004_1DBF83ECD7F54FB992ECE8E65C8CEFD7alumnicaltechedu_
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--_004_1DBF83ECD7F54FB992ECE8E65C8CEFD7alumnicaltechedu_--




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Zip created by pigz[1] is deemed to be corrupted even though it is consider=
ed valid by unzip et alli [2].   I do not claim pigz&#39;s zip is correct b=
ut other un/zippers think so. Apparently it is mentioned in paragraph 4.3.9=
.3 of ZIP File Format Specification [3][4].   4.3.9.3 Although not original=
ly assigned a signature, the value=C2=A0  0x08074b50 has commonly been adop=
ted as a signature value=C2=A0  for the data descriptor record.=C2=A0 Imple=
menters SHOULD be=C2=A0  aware that ZIP files MAY be encountered with or wi=
thout this=C2=A0  signature marking data descriptors and SHOULD account for=
  either case when reading ZIP files to ensure compatibility.   Also made a=
 script that shows that in practice (attached).   If you find this zip corr=
ect make gzip aware of it, if otherwise you find it incorrect else let me k=
now, I may raise in pigz issues.   Regards.   --   1.  github.com https://g=
ithub.com/madler/pigz   2. unzip, doublecmd, totalcmd, 7zip, winrar, and li=
kely others   3.  pkware.cachefly.net https://pkware.cachefly.net/webdocs/c=
asestudies/APPNOTE.TXT   4.  sourceforge.net https://sourceforge.net/p/seve=
nzip/bugs/2416/#84d4=0D

--10CQFFLJRGIMUUSIFECPSMnhgwp
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<div><span style=3D"color: var(--newhope-colors-gray-100); font-size: var(-=
-font-sizes-md); font-weight: var(--font-weights-normal); letter-spacing: v=
ar(--letter-spacings-base);">Zip created by pigz[1] is deemed to be corrupt=
ed even though it is considered valid by unzip et alli [2].</span><br></div=
><div><br></div><div>I do not claim pigz's zip is correct but other un/zipp=
ers think so. Apparently it is mentioned in paragraph 4.3.9.3 of ZIP File F=
ormat Specification [3][4].<br></div><div><br></div><div>4.3.9.3 Although n=
ot originally assigned a signature, the value&nbsp;<br></div><div>0x08074b5=
0 has commonly been adopted as a signature value&nbsp;<br></div><div>for th=
e data descriptor record.&nbsp; Implementers SHOULD be&nbsp;<br></div><div>=
aware that ZIP files MAY be encountered with or without this&nbsp;<br></div=
><div>signature marking data descriptors and SHOULD account for<br></div><d=
iv>either case when reading ZIP files to ensure compatibility.<br></div><di=
v><br></div><div>Also made a script that shows that in practice (attached).=
<br></div><div><br></div><div>If you find this zip correct make gzip aware =
of it, if otherwise you find it incorrect else let me know, I may raise in =
pigz issues.<br></div><div><br></div><div>Regards.<br></div><div><br></div>=
<div>--<br></div><div><br></div><div>1. <a href=3D"https://github.com/madle=
r/pigz">https://github.com/madler/pigz</a><br></div><div><br></div><div>2. =
unzip, doublecmd, totalcmd, 7zip, winrar, and likely others<br></div><div><=
br></div><div>3. <a href=3D"https://pkware.cachefly.net/webdocs/casestudies=
/APPNOTE.TXT">https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT</=
a><br></div><div><br></div><div>4. <a href=3D"https://sourceforge.net/p/sev=
enzip/bugs/2416/#84d4">https://sourceforge.net/p/sevenzip/bugs/2416/#84d4</=
a><br></div><div><br></div><div><br></div><br><div><br></div>
--10CQFFLJRGIMUUSIFECPSMnhgwp--

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Date: Sun, 15 Jun 2025 09:37:56 -0700
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Subject: Re: bug#78799: Zip created by pigz is deemed to be corrupted
To: "Adler, Mark" <madler@HIDDEN>
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On 2025-06-15 08:25, Adler, Mark wrote:
> The problem is with the =E2=80=9Cother un/zippers=E2=80=9D which per th=
e linked report on sourceforge is actually just 7-Zip.

Thanks for diagnosing; closing the gzip bug report.


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To: oset <oset@HIDDEN>
Subject: bug#78799: closed (Re: bug#78799: Zip created by pigz is deemed
 to be corrupted)
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Your bug report

#78799: Zip created by pigz is deemed to be corrupted

which was filed against the gzip package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 78799 <at> debbugs.gnu.org.

--=20
78799: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D78799
GNU Bug Tracking System
Contact help-debbugs@HIDDEN with problems

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Subject: Re: bug#78799: Zip created by pigz is deemed to be corrupted
To: "Adler, Mark" <madler@HIDDEN>
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 <1DBF83EC-D7F5-4FB9-92EC-E8E65C8CEFD7@HIDDEN>
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From: Paul Eggert <eggert@HIDDEN>
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On 2025-06-15 08:25, Adler, Mark wrote:
> The problem is with the =E2=80=9Cother un/zippers=E2=80=9D which per th=
e linked report on sourceforge is actually just 7-Zip.

Thanks for diagnosing; closing the gzip bug report.


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Zip created by pigz[1] is deemed to be corrupted even though it is consider=
ed valid by unzip et alli [2].   I do not claim pigz&#39;s zip is correct b=
ut other un/zippers think so. Apparently it is mentioned in paragraph 4.3.9=
.3 of ZIP File Format Specification [3][4].   4.3.9.3 Although not original=
ly assigned a signature, the value=C2=A0  0x08074b50 has commonly been adop=
ted as a signature value=C2=A0  for the data descriptor record.=C2=A0 Imple=
menters SHOULD be=C2=A0  aware that ZIP files MAY be encountered with or wi=
thout this=C2=A0  signature marking data descriptors and SHOULD account for=
  either case when reading ZIP files to ensure compatibility.   Also made a=
 script that shows that in practice (attached).   If you find this zip corr=
ect make gzip aware of it, if otherwise you find it incorrect else let me k=
now, I may raise in pigz issues.   Regards.   --   1.  github.com https://g=
ithub.com/madler/pigz   2. unzip, doublecmd, totalcmd, 7zip, winrar, and li=
kely others   3.  pkware.cachefly.net https://pkware.cachefly.net/webdocs/c=
asestudies/APPNOTE.TXT   4.  sourceforge.net https://sourceforge.net/p/seve=
nzip/bugs/2416/#84d4=0D

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<div><span style=3D"color: var(--newhope-colors-gray-100); font-size: var(-=
-font-sizes-md); font-weight: var(--font-weights-normal); letter-spacing: v=
ar(--letter-spacings-base);">Zip created by pigz[1] is deemed to be corrupt=
ed even though it is considered valid by unzip et alli [2].</span><br></div=
><div><br></div><div>I do not claim pigz's zip is correct but other un/zipp=
ers think so. Apparently it is mentioned in paragraph 4.3.9.3 of ZIP File F=
ormat Specification [3][4].<br></div><div><br></div><div>4.3.9.3 Although n=
ot originally assigned a signature, the value&nbsp;<br></div><div>0x08074b5=
0 has commonly been adopted as a signature value&nbsp;<br></div><div>for th=
e data descriptor record.&nbsp; Implementers SHOULD be&nbsp;<br></div><div>=
aware that ZIP files MAY be encountered with or without this&nbsp;<br></div=
><div>signature marking data descriptors and SHOULD account for<br></div><d=
iv>either case when reading ZIP files to ensure compatibility.<br></div><di=
v><br></div><div>Also made a script that shows that in practice (attached).=
<br></div><div><br></div><div>If you find this zip correct make gzip aware =
of it, if otherwise you find it incorrect else let me know, I may raise in =
pigz issues.<br></div><div><br></div><div>Regards.<br></div><div><br></div>=
<div>--<br></div><div><br></div><div>1. <a href=3D"https://github.com/madle=
r/pigz">https://github.com/madler/pigz</a><br></div><div><br></div><div>2. =
unzip, doublecmd, totalcmd, 7zip, winrar, and likely others<br></div><div><=
br></div><div>3. <a href=3D"https://pkware.cachefly.net/webdocs/casestudies=
/APPNOTE.TXT">https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT</=
a><br></div><div><br></div><div>4. <a href=3D"https://sourceforge.net/p/sev=
enzip/bugs/2416/#84d4">https://sourceforge.net/p/sevenzip/bugs/2416/#84d4</=
a><br></div><div><br></div><div><br></div><br><div><br></div>
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On 2025-06-15 09:46, Adler, Mark wrote:
> It was not clear, but this is a gzip report, not a pigz report.

Ah, thanks for letting me know. I reopened the gzip bug report.

Maybe someday somebody can get around to looking into the issue on the 
gzip side.




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