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78 views

Different Number Base Systems

I am doing a summer assignment for AP Computer Science. For this I am learning about different number base systems and how to convert them. These topics led to me wondering about why programmers use ...
214 views

What separates text files from binary files, considering they are stored in binary?

There are text files and there are image, video, and music files. Why are image, video, and music files considered binary files, and why are text files not?
117 views

Why directly edit binary files?

This may be a naive question, but I wonder when and why (non-research) developers would directly edit a binary file. It seems like the only good reason to use one is to create a kludge when you need ...
145 views

What is a Relocatable Binary?

What is a Relocatable Binary? I tried doing some search on Google, but I am still confused. Also: what is the difference between an Executable and a Relocatable Binary?
300 views

Optimize a git repo, containing large binary files

Our project is about 11GB, 10 of which are binary data (.png images). Consequently, a git diff or git status operations take up more than a minute. Fortunately all data files are separated into a ...
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Restricted randomization of a binary vector

Suppose I have a binary vector of sample size N with each of the two possible values (e.g., 0 and 1 occurring equally often). For example, if N=10, the binary vector is: 0 0 0 0 0 1 1 1 1 1 Suppose ...
188 views

Representing a number in 12 Bit 2's Complement Fixed Point

The original question is as follows: Consider a 12-bit two's complement fixed point representation, with 8 bits for the integer part and 4 bits for the fraction. What is the binary encoding of ...
67 views

Persisting and manipulating JS ArrayBuffer data on the server

My node.js app has to deal with (sometimes large; a few MB) tables of numerical data. I'm about to use JavaScript's native binary objects for this purpose (i.e. ArrayBuffer and friends), because they'...
78 views

Benefits of this data format

I'm integrating with a bluetooth blood pressure monitor, and I've come across one of the most bizarre data formats I've ever seen. The systolic, diastolic and pulse rate (all ints, should all be ...
532 views

audio file processing in C++

I thought of the following project that I want to pursue: I want to create a C++ program, that can play audiofiles and visualize the amplitudes of individual frequency bands in real time (e.g. with ...
31 views

Generating New Media Content From Binary Patterns

At the most basic level, a digital media file (document, song, video, etc) is just a rather large pattern of 1's and 0's. We can say that for any given piece of digital media, there corresponds a ...
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Are hex dump and binary-to-text encoding related or different things?

Binary-to-text encoding is to represent binary data as characters. Hex dump of binary files seem also do the same for reading binary files. Are they related or different things?
550 views

Data format for binary data transfer

I have to make an oscilloscope. Ideally, the oscilloscope connects to a probe. This probe should be another program, and could get the data locally or from a network. This data are numbers, floats and/...
240 views

Does it really need to convert decimal,string, etc to binary?

I'm very new to programming. Just read some articles about algorithm for converting a decimal or string to binary. But,according to what I know, computers hold these data in binary form. So why don't ...
1k views

How to determine whether two trees (not necessarily binary) are isomorphic

Two ordered trees T' and T'' are said to be isomorphic if one of the following holds: ◦ both T' and T'' consist of a single node ◦ both T' and T'' have the same number k of subtrees, and the ith ...
1k views

Why aren't “fat binaries” more widely used for cross-platform applications?

As far as I know, so-called "fat binaries"--executable files that contain machine code for multiple systems--are only really used on Apple PCs, and even there it seems like they only used them because ...
214 views

Optimal data structure for binary data/Java

I have several input formats mostly restricted to geotiff and some proprietary binary formats. I import them into my program and then need to export them into various other data formats (also binary) ...
126 views

How were assemblers created straight from binary? [duplicate]

How did these earlier programmers know what combinations of binary produced certain results? Is there a way I can create an assembler from binary today?
2k views

Bitwise operation on uppercase ASCII character turns to lowercase. Why?

I came across this in the http_parser library of node.js implementation. When I bitwise-OR an ASCII capitalized character code, it converts into its lowercase version. The lowercase version remains as ...
305 views

When trying to find out if a number is even or odd: AND 1 or OR 0

I recently learned of the trick for finding out if a binary number is odd or even. If the last bit in the number is 0, then the number is even. If it ends in a 1, then the number is odd. In the ...
1k views

Is it allowed to embed an LGPL command-line tool?

I want to sell a closed-application that depends upon a certain command line tool. Am I allowed to distribute my software including this command line tool? For example, as a separate binary ...
168 views

Conveniently sorting and (binary?) searching an array of pairs of numbers?

So I have an array of distinct pairs of positive integers. That is, my array looks something like this (for instance): { (1,5) , (6,4), (5,3), (2,3), (2,4) } And my task is, for a given pair (a,b) ...
2k views

Benefits of Java ByteArrayInputStream vs byte array?

I have a scenario where my Java process will be receiving a stream of binary data: public class DataHandler { public void handleData(DATA data) { // TODO: Do something with data } } ...
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Is it possible to modify a native executable and change (dynamic) library it depends on?

Say I compile a simple application called myproggy that depends on the libfoo dynamic library. Assuming I have another dynamic library libbaz that implements absolutely the same interface (in other ...
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How do you set and check a single bit in a programming language that does not support bitwise operations?

I'm using a programming language (more a scripting language) that does not support any bitwise operators like AND, OR, XOR, NOT (and shift as well). Common arithmetic and logical operations like + - *...
50 views

Using a binary from a project that violates GPL

There is an open source project which uses GPLv2. It had numerous releases that complied with GPL in the past where source code was available for given binaries. The newest source code is about 18 ...
628 views

Why do binary files load quicker than alphanumeric text files?

I've noticed that when I load/store large data files in a binary format, the program runs much faster than if I load data from an ASCII encoded file. Why is this the case? The data in my case is ...
910 views

What are the bytes between the MSB and LSB named? [closed]

I've searched around and can't find anything on what the middle bytes of a >16-bit integer are called, if anything. Are there standard names for these bytes? E.g. the number 0x0D0C0B0A would have: ...
7k views

Is machine language always binary? [duplicate]

I know absolutely nothing in low-level stuff, so this will be a very newbie question. Please excuse my ignorance. Is machine language - the series of numbers to that tell the physical computer ...
539 views

Is byte stuffing required when using a packet field length

I'm involved in a project which involves implementing a binary protocol that will be transmitted over TCP. During our early discussions we have hit a brief snag on deciding whether byte stuffing is ...
5k views

Why can't native machine code be easily decompiled?

With bytecode-based virtual machine languages like Java, VB.NET, C#, ActionScript 3.0, etc., you hear sometimes about how easy it is to just go download some decompiler off the Internet, run the ...
378 views

How exactly does a program (executable image) and library (pre-compiled image) “link” together?

I know very well of the difference of static versus dynamic linking. What I want to know is, when linking statically (with a library like Winmm.lib on Windows), how does the linker "link" the pre-...
775 views

How to safely run random binary codes? [closed]

Okay, so I am looking for a way to safely run a randomly generated binary code. I also need to be able to decompile the code. Any ideas and all programming languages are welcome. BTW it most be ...
447 views

Please give reasons for your answer. As I found, two additions are needed. This is because every number to be add needs to changed to binary. Then addition is done between two binary numbers where ...
4k views

Why does division and multiplication by 2 use the shift operator rather than division operator?

While looking at the code in C for division/multiplication by 2, it is found that shift operator is used rather than division operator. What is the advantage of using shift over division operator?
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What is meant by binary compatibility? What is its importance during serialization/deserialization in a language like Java that deals in byte code?

In computing what is meant by binary compatibility? I read about it in context of serialization/deserialization that this process of serialize/deserialize should be binary compatible. What does it ...
640 views

How should I structure a C# application that reads & writes binary data?

I have to read and write binary "chunks" of approximately 1Mb each. The data can come in the form of a stream or a in-memory byte[]. Normally I would use a Struct with a fixed layout, but there are ...
216 views

Can we create a GPL application that has a payware advertisement on it?

We've been thinking of using GPL components to make a GPL application, and freely give it away. We then want to use that as a loss-leader. In that free application, where even the source code is ...
18k views

Is there something special about the number 65535?

2¹⁶-1 & 2⁵ = 2⁵ (or? obviously ?) A developer asked me today what is bitwise 65535 & 32 i.e. 2¹⁶-1 & 2⁵ = ? I thought at first spontaneously 32 but it seemed to easy whereupon I thought ...
3k views

Extracting color profile information from JPEG files

I'm trying to look up info about reading JPEG's color profile info and to my surprise there's very little open specific how-to information on that regard, but rather lots of general explanation on ...
242 views

Which numeral systems are useful in computer science?

I am wondering which numeral system different programmers are using, or would use if their language has support for them. As an example, in C++ we can use: Octal by prefixing with 0 (e.g. 0377) ...
532 views

How much is modern programming still tied to underyling digital logic? [closed]

First of all: I've got no academic background. I'm working primarily with Java and Spring and I'm also fond of web programming and relational databases. I hope I'm using the right terms and I hope ...
4k views

Compiling vs using pre-built binaries performance?

Will performance be better (quicker) if I manually compile the source for a software component for the actual machine that it will be used on, compared to if the source was compiled on another ...
125 views

What does “windowed streaming” stand for?

So I was asking around the Mercurial development mailing list about binary diffing and patch handling and I got the following examples: whole file approaches (classic diff, bsdiff, Mercurial's ...
136 views

What does it mean “you can pick K to be whatever you want” in Excess-N notation?

I prefer providing an example to explain the following paragraph: However, since excess K representation using N bits has two parameters, K and N, you can pick K to be whatever you want. You can ...
3k views

Understanding binary numbers in terms of real world objects [closed]

When I represent a number in the decimal system, I have an intuitive knowledge of what it amounts to. For example take the number '10': I understand that it means 10 apples or 10 people... i.e I can ...
420 views

How is this number calculated?

I have numbers; A == 0x20000000 B == 18 C == (B/10) D == 0x20000004 == (A + C) A and D are in hex, but I'm not sure what the assumed numeric bases of the others are (although I'd assume base 10 ...
8k views

binary representation in Python and keeping leading zeros

I wanted to use the base64 Python library to encode a sequence of binary digits into base 64. Would it be possible to do it without converting to a string? If not, what is the best way to do it, ...