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[Octave-bug-tracker] [bug #41648] fread not working with skip parameter
From: |
anonymous |
Subject: |
[Octave-bug-tracker] [bug #41648] fread not working with skip parameter |
Date: |
Thu, 20 Feb 2014 18:03:13 +0000 |
User-agent: |
Mozilla/5.0 (Windows NT 6.1; rv:27.0) Gecko/20100101 Firefox/27.0 |
URL:
<http://savannah.gnu.org/bugs/?41648>
Summary: fread not working with skip parameter
Project: GNU Octave
Submitted by: None
Submitted on: Thu 20 Feb 2014 06:03:11 PM UTC
Category: Octave Function
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: Regression
Status: None
Assigned to: None
Originator Name: Tiago Loureiro
Originator Email: address@hidden
Open/Closed: Open
Discussion Lock: Any
Release: 3.8.0
Operating System: Microsoft Windows
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Details:
The fread function is not behaving correctly when skipping after a read.
With the following data in a binary file (attached):
000102030405060708090A0B0C0D0E0F
Reading it with the following commands:
fid=fopen("test.bin","rb","ieee-be");
a=fread(fid, inf, "uint8",1);
a'
should yield (in hex):
ans =
0 2 4 6 8 10 12 14
but returns instead (in hex):
ans =
0 2 3 4 5 6 7 8 9 10 11 12 13 14 15
It is interesting to note that if called sequentially like this with skip=1:
fread(fid, 1, "uint8",1);
the correct sequence is read.
However, if called like this:
fread(fid, inf, "2*uint8",2)
it yields a strange sequence:
ans =
0 1 4 5 6 7 8 9 10 11 12 13 14 15
Note the first two bytes being read correctly, and then the skip is forgotten
and the rest of the file is read. The expected sequence would be instead:
ans =
0 1 4 5 8 9 12 13
Finally, when doing the following:
fread(fid, 1, "2*uint8",2)
octave crashes with the message "Aborted".
It is as if it is getting confused between bytes to read and elements to read,
and that the logic of whether to skip or not is broken.
_______________________________________________________
File Attachments:
-------------------------------------------------------
Date: Thu 20 Feb 2014 06:03:11 PM UTC Name: test.bin Size: 16B By: None
<http://savannah.gnu.org/bugs/download.php?file_id=30618>
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?41648>
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- [Octave-bug-tracker] [bug #41648] fread not working with skip parameter,
anonymous <=
- [Octave-bug-tracker] [bug #41648] fread not working with skip parameter, Rik, 2014/02/20
- [Octave-bug-tracker] [bug #41648] fread not working with skip parameter, John W. Eaton, 2014/02/20
- [Octave-bug-tracker] [bug #41648] fread not working with skip parameter, Rik, 2014/02/20
- [Octave-bug-tracker] [bug #41648] fread not working with skip parameter, John W. Eaton, 2014/02/21
- [Octave-bug-tracker] [bug #41648] fread not working with skip parameter, Rik, 2014/02/22
- [Octave-bug-tracker] [bug #41648] fread not working with skip parameter, John W. Eaton, 2014/02/22
- [Octave-bug-tracker] [bug #41648] fread not working with skip parameter, Rik, 2014/02/22