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Maximum string length (32767 bytes) is not validated [CORE4781] #5080

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firebird-issue-importer opened this issue May 4, 2015 · 7 comments

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firebird-issue-importer commented May 4, 2015

Submitted by: @pavel-zotov

Attachments:
DML-blob-literal-65535-vs-65536-characters.zip

Consider these statements:

recreate table test(
id int,
bf blob
);
commit;
insert into test(id) values(1);
insert into test(id) values(2);
commit;

update test set bf = rpad('',32760, 'ldlkdw89dw89d2kssdjkcsuic3892343kbmvasjhcvsdyucg872348234ejwehsjksi2ljkqwejklwo19ll.ajqa28976a;1kla')
where id = 1;
update test set bf = bf || rpad('',32760, 'ldlkdw89dw89d2kssdjkcsuic3892343kbmvasjhcvsdyucg872348234ejwehsjksi2ljkqwejklwo19ll.ajqa28976a;1kla')
where id = 1;
update test set bf = bf || '1234567890abcdef'
where id = 1;

-- they all works fine, resulting blob will be written so that:
1) it could be displayed later using SET BLOB ALL
2) its octet_length will return proper value (65536).

Now try to continue with following:

update test set bf = ' '
where id = 2;

insert into test(id, bf) values( 3, ' ' );
commit;

set blob all;
set list on;
select
id,
coalesce(bf, '$$$ NULL $$$') blob_content,
iif(bf is null, 'is-null!','not-null') bf_is_null,
octet_length(bf),
char_length(bf)
from test;

Result will be:

ID 1
BLOB_CONTENT ac:f1
' '
OCTET_LENGTH 65536
CHAR_LENGTH 65536

ID 2
BLOB_CONTENT ac:f0

OCTET_LENGTH 0
CHAR_LENGTH 0

ID 3
BLOB_CONTENT ac:f2

OCTET_LENGTH 0
CHAR_LENGTH 0

PS. Scripts for char_len = 65535 and 65536 bytes (and logs) see in attached file.

Commits: 020126e bdbdc30 FirebirdSQL/fbt-repository@b15cfe7 FirebirdSQL/fbt-repository@951b75d

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firebird-issue-importer commented May 4, 2015

Modified by: @pavel-zotov

Attachment: DML-blob-literal-65535-vs-65536-characters.zip [ 12741 ]

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firebird-issue-importer commented May 4, 2015

Modified by: @asfernandes

assignee: Adriano dos Santos Fernandes [ asfernandes ]

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firebird-issue-importer commented May 4, 2015

Modified by: @asfernandes

Component: Engine [ 10000 ]

summary: Blob literal with length >= 65536 bytes can not be displayed or handled correctly after its saving via INSERT or UPDATE statement => Maximum string length (32765 bytes) is not validated

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firebird-issue-importer commented May 4, 2015

Modified by: @asfernandes

Version: 3.0 Beta 1 [ 10332 ]

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firebird-issue-importer commented May 4, 2015

Modified by: @asfernandes

status: Open [ 1 ] => Resolved [ 5 ]

resolution: Fixed [ 1 ]

Fix Version: 3.0 Beta 2 [ 10586 ]

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firebird-issue-importer commented May 27, 2015

Modified by: @pavel-zotov

status: Resolved [ 5 ] => Resolved [ 5 ]

QA Status: Done successfully

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firebird-issue-importer commented Jul 14, 2015

Modified by: @asfernandes

summary: Maximum string length (32765 bytes) is not validated => Maximum string length (32767 bytes) is not validated

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