#36934 [Opn->Asn]: OCILob->read() doesn't move internal pointer when reading 0's
ID: 36934
Updated by: tony2001@php.net
Reported By: sswpwp at poczta dot onet dot pl
-Status: Open
+Status: Assigned
Bug Type: OCI8 related
Operating System: Windows 2000
PHP Version: 5CVS-2006-03-31 (snap)
-Assigned To:
+Assigned To: tony2001
Previous Comments:
------------------------------------------------------------------------
[2006-03-31 16:51:13] sswpwp at poczta dot onet dot pl
Description:
------------
When using OCILob->read(length) function with BLOBs containing 0's it
reads specified amount of bytes but doesn't move internal pointer
properly. The pointer is moved to the next '0' byte and no further.
I think the possible cause of this bug is line 223 in oci8_lob.c file:
data_len_chars = OCIMultiByteStrnDisplayLength(connection->env, *data,
bytes_total);
Propably the function quits after reaching '\0' character instead of
checking bytes_total bytes and as such should be used only with CLOBs.
Reproduce code:
---------------
First 128 bytes in the BLOB I'm reading are 0's, then there are 5
non-zero bytes followed by some more 0's.
$stmt = oci_parse($auth->conn, "SELECT ZDJT_IMAGE FROM IMAGES WHERE
IMAGE_ID = 1");
oci_execute($stmt);
$row = oci_fetch_assoc($stmt);
$row['ZDJT_IMAGE']->read(128);
echo $row['ZDJT_IMAGE']->tell();
$row['ZDJT_IMAGE']->read(128);
echo $row['ZDJT_IMAGE']->tell();
$row['ZDJT_IMAGE']->seek(128);
echo $row['ZDJT_IMAGE']->tell();
$row['ZDJT_IMAGE']->read(128);
echo $row['ZDJT_IMAGE']->tell();
Expected result:
----------------
The expected result would be:
128
256
128
256
Actual result:
--------------
0
0
128
133
------------------------------------------------------------------------
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