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b=O1Jm8Gp7lf1MKkTsOteGqLB6iDnMIkwLwXOCcjSPdjyR/nVjRVoN19Ha6jvXkNYT hhd3rN3cPV7z3lHj7gV/OJ1Aap3Pj8Cj12QO5Yq5RI+78abugEkiCJ76xUVI2iuw4r7 n/jtDZpwfiyEcRhjb/OxLfM4I0gwle9VzTlFRktQ= Received: from lchch (124.133.18.218 [124.133.18.218]) by mx.zohomail.com with SMTPS id 15839850993281022.4933947360275; Wed, 11 Mar 2020 20:51:39 -0700 (PDT) Date: Thu, 12 Mar 2020 11:51:38 +0800 From: "movead.li@highgo.ca" To: pgsql-hackers Subject: A bug when use get_bit() function for a long bytea string X-Priority: 3 X-GUID: 0FDE034A-613B-464C-9CEC-A1CF67554687 X-Has-Attach: yes X-Mailer: Foxmail 7.2.14.410[cn] Mime-Version: 1.0 Message-ID: <20200312115135445367128@highgo.ca> Content-Type: multipart/mixed; boundary="----=_001_NextPart534303620088_=----" X-Zoho-Virus-Status: 1 X-ZohoMailClient: External List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Precedence: bulk This is a multi-part message in MIME format. ------=_001_NextPart534303620088_=---- Content-Type: multipart/alternative; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable =0A
Hello hackers,

=0A
I found an issue about get_bit() and set_bit() functi= on,here it is:
################################
postgres=3D# select get_bit(p= g_read_binary_file('/home/movead/temp/file_seek/f_512M'), 0);
20= 20-03-12 10:05:23.296 CST [10549] ERROR:  index 0 out of valid range,= 0..-1
2020-03-12 10:05:23.296 CST [10549] STATEMENT:  sele= ct get_bit(pg_read_binary_file('/home/movead/temp/file_seek/f_512M'), 0);<= /div>
ERROR:  index 0 out of valid range, 0..-1
postgre= s=3D# select set_bit(pg_read_binary_file('/home/movead/temp/file_seek/f_51= 2M'), 0,1);
2020-03-12 10:05:27.959 CST [10549] ERROR:  ind= ex 0 out of valid range, 0..-1
2020-03-12 10:05:27.959 CST [1054= 9] STATEMENT:  select set_bit(pg_read_binary_file('/home/movead/temp/= file_seek/f_512M'), 0,1);
ERROR:  index 0 out of valid rang= e, 0..-1
postgres=3D#
################
Postgr= eSQL can handle bytea size nearby 1G, but now it reports an
erro= r when 512M. And I research it and found it is byteaSetBit() and
byteaGetBit(), it uses an 'int32 len' to hold bit numbers for the long
bytea data, and obvious 512M * 8bit is an overflow = for an int32. 
So I fix it and test ok, as= below.
###############= #################
postgres=3D# select get_bit(set_bit(pg_read_binar= y_file('/home/movead/temp/file_seek/f_512M'), 0,1),0);=0A get_bit =0A-----= ----=0A 1=0A(1 row)=0Apostgres=3D# select get_bit(set_bit(pg_read_bi= nary_file('/home/movead/temp/file_seek/f_512M'), 0,0),0);=0A get_bit =0A--= -------=0A 0=0A(1 row)=0Apostgres=3D#
#######= #########################


And I do a che= ck about if anything else related bytea has this issue, several=0Acodes ha= ve the same issue:
=0A1. byteaout()=0AWhen formatting bytea as an escape, the = 'len' variable should be int64, or
it may use an overflowing number.=0A2. esc_= enc_len()=0ASame as above, the 'len' variable should be int64, and the re= turn type
should change as int64.=0ADue to esc_enc_len() has same call struct = with pg_base64_enc_len() and=0Ahex_enc_len(), so I want to change the retu= rn value of the two function.=0AAnd the opposite function esc_dec_len() se= em nothing wrong.=0A3. binary_encode() and binary_decode()=0AHere use an '= int32 resultlen' to accept an 'unsigned int' function return,=0Awhich seem= unfortable.
=0AI fix all mentioned above, and patch attachments.
=
How do you think= about that?


=0A
Highgo Software (Canada/China/Pakistan)
URL : <= /span>www.highgo.ca
EMAIL: mailto:movead(dot)li(at)highgo(dot)ca
<= /span>
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