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• Python: Ignore 'Incorrect padding' error when base64 decoding

  - by swisstony

  I have some data that is base64 encoded that I want to convert back to binary even if there is a padding error in it. If I use base64.decodestring(b64_string) it raises an 'Incorrect padding' error. Is there another way?

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• B-trees, databases, sequential inputs, and speed.

  - by IanC

  I know from experience that b-trees have awful performance when data is added to them sequentially (regardless of the direction). However, when data is added randomly, best performance is obtained. This is easy to demonstrate with the likes of an RB-Tree. Sequential writes cause a maximum number of tree balances to be performed. I know very few databases use binary trees, but rather used n-order balanced trees. I logically assume they suffer a similar fate to binary trees when it comes to sequential inputs. This sparked my curiosity. If this is so, then one could deduce that writing sequential IDs (such as in IDENTITY(1,1)) would cause multiple re-balances of the tree to occur. I have seen many posts argue against GUIDs as "these will cause random writes". I never use GUIDs, but it struck me that this "bad" point was in fact a good point. So I decided to test it. Here is my code: SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE TABLE [dbo].[T1]( [ID] [int] NOT NULL CONSTRAINT [T1_1] PRIMARY KEY CLUSTERED ([ID] ASC) ) GO CREATE TABLE [dbo].[T2]( [ID] [uniqueidentifier] NOT NULL CONSTRAINT [T2_1] PRIMARY KEY CLUSTERED ([ID] ASC) ) GO declare @i int, @t1 datetime, @t2 datetime, @t3 datetime, @c char(300) set @t1 = GETDATE() set @i = 1 while @i < 2000 begin insert into T2 values (NEWID(), @c) set @i = @i + 1 end set @t2 = GETDATE() WAITFOR delay '0:0:10' set @t3 = GETDATE() set @i = 1 while @i < 2000 begin insert into T1 values (@i, @c) set @i = @i + 1 end select DATEDIFF(ms, @t1, @t2) AS [Int], DATEDIFF(ms, @t3, getdate()) AS [GUID] drop table T1 drop table T2 Note that I am not subtracting any time for the creation of the GUID nor for the considerably extra size of the row. The results on my machine were as follows: Int: 17,340 ms GUID: 6,746 ms This means that in this test, random inserts of 16 bytes was almost 3 times faster than sequential inserts of 4 bytes. Would anyone like to comment on this? Ps. I get that this isn't a question. It's an invite to discussion, and that is relevant to learning optimum programming.

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• How to insert / retrieve a file stored as a BLOB in a MySQL db using python

  - by Phage

  I want to write a python script that populates a database with some information. One of the columns in my table is a BLOB that I would like to save a file to for each entry. How can I read the file (binary) and insert it into the DB using python? Likewise, how can I retrieve it and write that file back to some arbitrary location on the hard drive?

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• How to tell svn to not manage history for one file

  - by Prabu

  I don't know whether SVN has this feature, How do I tell svn to not maintain the history of changes for a file but it should have only the latest version of the file. Of course this is not the work of a version control, but it will be useful if I want to have some binary files within the repo without versioning.

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• openxml option to be fully in text format ?

  - by asksuperuser

  I have tried to generate "Hello World" with openxml sdk. To my surprise when trying to open the xml document it was not purely text format but it contains some ugly binary stuff. Is there any option to have text format when the content is only text ?

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• PHP Upload file enhance security

  - by mandril

  Hey.. my question is how to prevent someone upload a virus or some malicious code with the extension you pretend for example i have a pdf file uploader, anyone can upload a binary with pdf camouflage there are lots of programs to do that.

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• Can str_replace mangle a UTF-8 encoded string if it's only given valid UTF-8 encoded strings as argu

  - by Manos Dilaverakis

  PHP's str_replace() was intended only for ANSI strings and as such can mangle UTF-8 strings. However, given that it's binary-safe would it have a problem if it was only given valid UTF-8 strings as arguments? Edit: I'm not looking for a replacement function, I would just like to know if this hypothesis is correct.

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• Tool to convert .Glade (or xml) file to C source.

  - by PP

  I am looking for tool that can convert .Glade (or xml) file to C source. I have tried g2c (Glade To C Translator) but i am looking for windows binary. Any one does know any good tool for window. Thanks, PP.

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• [RAILS] Howto to download a file from a http and save it into database

  - by Chris

  Hi, i would like to create a Rails controller that download a serie of jpg files from the web and directly write them into database as binary (I am not trying to do an upload form) Any clue on the way to do that ? Thank you

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• Python's cPickle deserialization from PHP?

  - by Ciantic

  Hi! I have to deserialize a dictionary in PHP that was serialized using cPickle in Python. In this specific case I probably could just regexp the wanted information, but is there a better way? Any extensions for PHP that would allow me to deserialize more natively the whole dictionary? Apparently it is serialized in Python like this: import cPickle as pickle data = { 'user_id' : 5 } pickled = pickle.dumps(data) print pickled Contents of such serialization cannot be pasted easily to here, because it contains binary data.

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• Apple rejected my app due to icons not matching. If I submit a new icon, does the review continue?

  - by dbonneville

  The status says "rejected" in iTunes Connect. I replied to the email I got, left the "line" in there that they apparently use for tracking. Do I just wait to hear back from them or do I reject the entire binary and start over? It's not clear from the email or the site what is supposed to or will happen next.

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• Get Visual Studio to produce the same DLL for the same C# source

  - by JoelFan

  I noticed that when I build a given C# source to produce a DLL, the binary output is different each time. It would be helpful for our build / deployment process if this was not the case. Can I control this?

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• converting 6 bytes hex string to 8 byte raw data

  - by ron

  How can i convert a hex string lenght 6 bytes for example string ='1122aaccddff'; to raw binary data of lenght 8 byes the last 2 bytes shoul be padded with zeros,

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• how to detect if openGL/card supports non power of 2?

  - by Nick

  What is the best way to detect if a graphics card and compiled openGL binary supports textures which are not a power of 2 at run time?

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• How do Hex editors display data so quickly?

  - by user146780

  I'v created a Notepad-like application and if I load a 1MB file into the textbox, it takes about 1 minute. The Visual Studio Binary editor displays lines, Hex, and ascii versions in a fraction of a second. How do they get the data into the textbox so quickly? Thanks

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• MSSQL differential backup to SQL statements

  - by noonex

  Is there any way to convert differential backup to SQL statements which will produce identical results when applied? Or any other solution similar to binary log in MySQL?

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• Are interval, segment, fenwick trees the same?

  - by Luiguis

  Today i listened a lecture about fenwick trees (binary indexed trees) and the teacher says than this tree is a generalization of interval and segment trees, but my implementations of this three data structures are different. Is this afirmation true? and Why?

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• Boost Serialization Library upgrade

  - by Konstantin

  Hello! How do I know that I can safely upgrade Boost Serialization Library on a production system without breaking compatibility with the existing data ? Is there any test that I should perform in order to be sure that all data stored in the binary format by previous version of the library will be successfully read by the new one ? Does Boost Serialization library itself guarantee some sort of compatibility between versions ?

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• How many numbers in an array are smaller than a given number?

  - by Raihan

  The naive one is O(n). Is there a one that is O(log n) or even O(1)? How about a sorted array? How about using binary search tree?

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• ASP.NET MVC image upload store location (db vs filesystem)

  - by adrin

  I am writing web application using ASP.NET MVC + NHibernate + Postres stack. I wonder if images uploaded should be stored in database as binary blobs or on filesystem (and reference only in db). One advantage of db storage I can think of is easy backup/recovery of all data without reverting to filesystem copy tools. On the other hand I suspect that filesystem access may be faster (but is it especially when dealing with many concurrent requests?) What are your suggestions?

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• GDB disas question about address values

  - by user324994

  I'm working with a binary file that I disas'd in gdb. Right now I'm just examining the return value of a function. 0x08048604 <playGame+78>: ret Is the address shown the address where ret is stored in the function? Or is it just the address of the instruction to return the ret value?

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• How do you measure the effect of branch misprediction?

  - by Matt Wamboldt

  I'm currently profiling an implementation of binary search. Using some special instructions to measure this I noticed that the code has about a 20% misprediction rate. I'm curious if there is any way to check how many cycles I'm potentially losing due to this. It's a MIPS based architecture.

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• Hash Table v/s STL map in C++

  - by anon

  Hi, I am trying to learn C++ maps. Was just wondering about the implementation of STL map. I read it employs Binary search tree. Is there a implementation of hash table in STL? How exactly do STL map stores Key Value pairs?

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• Compile JavaScript to Native Code with V8

  - by Alon

  Is it really possible, with Google's V8 Engine, to compile JavaScript into Native Code, save it as a binary file, and execute it whenever I want through my software envorinment, on any machine?

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• C++: Saving the class object in archived format which is having char * attributes and read it back f

  - by Manjunath

  Hi all, Assume I have a class class A { char *attr1,*attr2; public: . . . }; How to save the object of this class to file in a binary format and read it back? Thanks.

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