If you want to find out only whether or not the files are identical, you can use the Windows &lt;code&gt;fc&lt;/code&gt; command in binary mode:

    fc.exe /b file1 file2

For details, see [the reference for fc](https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/fc)

A few possibilities:

 * [VBinDiff][1] (binary diff, designed for large files)
 * [WinDiff][2]
 * [bsdiff][3]
 * [HexCmp][4]

See also: https://web.archive.org/web/20151122151611/https://stackoverflow.com/questions/688504/binary-diff-tool-for-very-large-files


  [1]: http://www.cjmweb.net/vbindiff/
  [2]: http://en.wikipedia.org/wiki/WinDiff
  [3]: http://www.daemonology.net/bsdiff/
  [4]: http://www.fairdell.com/hexcmp/

[Total Commander][1] also has a binary compare option:
go to: `File \\Compare by content`

ps. I guess some people may alredy be using this tool and may not be aware of the built-in feature.


  [1]: http://www.ghisler.com/

My favorite &quot;swiss knife&quot; is Beyond Compare from http://www.scootersoftware.com/

I prefer to use objcopy to convert to hex, then use diff.

In Cygwin:

`$cmp -bl &lt;file1&gt; &lt;file2&gt;`

diffs binary offsets and values are in decimal and octal respectively.. Vladi.

&gt; **Possible Duplicate:**  
&gt; [JavaScript for detecting browser language preference](https://stackoverflow.com/questions/1043339/javascript-for-detecting-browser-language-preference)  

&lt;!-- End of automatically inserted text --&gt;

I want to detect the language of the browser that is entering my site, if it&#39;s En or Fr. So I can redirect to the En page or the other page.

Also, can I detect mobile language?

How to get the browser language using JavaScript

I am trying to get the whole body from the HttpServletRequest object.

The code I am following looks like this:

    if ( request.getMethod().equals(&quot;POST&quot;) )
    {
    	StringBuffer sb = new StringBuffer();
    	BufferedReader bufferedReader = null;
    	String content = &quot;&quot;;
    	
    	try {
    		//InputStream inputStream = request.getInputStream();
    		//inputStream.available();
    		//if (inputStream != null) {
    		bufferedReader =  request.getReader() ; //new BufferedReader(new InputStreamReader(inputStream));
    		char[] charBuffer = new char[128];
    		int bytesRead;
    		while ( (bytesRead = bufferedReader.read(charBuffer)) != -1 ) {
    			sb.append(charBuffer, 0, bytesRead);
    		}
    		//} else {
    		//        sb.append(&quot;&quot;);
    		//}
    	
    	} catch (IOException ex) {
    		throw ex;
    	} finally {
    		if (bufferedReader != null) {
    			try {
    				bufferedReader.close();
    			} catch (IOException ex) {
    				throw ex;
    			}
    		}
    	}
    	
    	test = sb.toString();
    }



and I am testing the functionality with curl and wget as follows:

    curl --header &quot;MD5: abcd&quot; -F &quot;fileupload=@filename.txt http://localhost:8080/abcd.html&quot;

    wget --header=&quot;MD5: abcd&quot; --post-data=&#39;{&quot;imei&quot;:&quot;351553012623446&quot;,&quot;hni&quot;:&quot;310150&quot;,&quot;wdp&quot;:false}&#39; http://localhost:8080/abcd.html&quot;


But the `while ( (bytesRead = bufferedReader.read(charBuffer)) != -1 )` does not return anything, and so I get nothing appended on StringBuffer.






Get the POST request body from HttpServletRequest

I need a tool to compare 2 binaries. The files are quite large. Some freeware or trial tools I found on the Internet are not convenient to use for large files. Can you recommend me some tools?

Tool for comparing 2 binary files in Windows

<p>I need a tool to compare 2 binaries. The files are quite large. Some freeware or trial tools I found on the Internet are not convenient to use for large files. Can you recommend me some tools?</p>


How can I convert a NodeJS binary buffer into a JavaScript ArrayBuffer?

Convert a binary NodeJS Buffer to JavaScript ArrayBuffer

I need a script/tool which reads a binary file and outputs a C/C++ source code array (which represents the file content). Are there any?

---

(This question was deleted earlier. I put this question back in because it is valuable. I was searching for exactly this on Google and didn&#39;t found anything. Of course it is trivial to code myself but I would have saved some minutes if I would have found such a simple script. Thus it is valuable.

This questions also had a lot of down-votes without much explanation. Please comment before you down-vote why you think this is of no value or of bad value.

This question also caused a lot of confusion about what I am asking about. If something is unclear, please ask. I don&#39;t really know how to make it more clear. See the answers for examples.

Also (after putting the question here), I already have several answers. I just want to put/link them here (again) because I think it might be useful for someone else searching for this.)

script/tool to convert file to C/C++ source code array

I find particularly difficult reading binary file with Python. Can you give me a hand?
I need to read this file, which in Fortran 90 is easily read by

    int*4 n_particles, n_groups
    real*4 group_id(n_particles)
    read (*) n_particles, n_groups
    read (*) (group_id(j),j=1,n_particles)

In detail, the file format is:

    Bytes 1-4 -- The integer 8.
    Bytes 5-8 -- The number of particles, N.
    Bytes 9-12 -- The number of groups.
    Bytes 13-16 -- The integer 8.
    Bytes 17-20 -- The integer 4*N.
    Next many bytes -- The group ID numbers for all the particles.
    Last 4 bytes -- The integer 4*N. 

How can I read this with Python? I tried everything but it never worked. Is there any chance I might use a f90 program in python, reading this binary file and then save the data that I need to use?

Reading a binary file with python



Efficient way to count number of 1s in the binary representation of a number in O(1) if you have enough memory to play with. This is an interview question I found on an online forum, but it had no answer. Can somebody suggest something, I cant think of a way to do it in O(1) time?

Count number of 1&#39;s in binary representation

I would like to convert a binary number writen in a String into its integer value. 

For example: 
 
    string input = &quot;0101&quot;;
    int output = convert(input);

`output` should be equal to `5` 

Convert binary string into integer

I have two objects: `oldObj` and `newObj`. 

The data in `oldObj` was used to populate a form and `newObj` is the result of the user changing data in this form and submitting it.

Both objects are deep, ie. they have properties that are objects or arrays of objects etc - they can be n levels deep, thus the diff algorithm needs to be recursive.

Now I need to not just figure out what was changed (as in added/updated/deleted) from `oldObj` to `newObj`, but also how to best represent it.

So far my thoughts was to just build a `genericDeepDiffBetweenObjects` method that would return an object on the form `{add:{...},upd:{...},del:{...}}` but then I thought: somebody else must have needed this before.

So... does anyone know of a library or a piece of code that will do this and maybe have an even better way of representing the difference (in a way that is still JSON serializable)?

### Update: 

I have thought of a better way to represent the updated data, by using the same object structure as `newObj`, but turning all property values into objects on the form:

    {type: &#39;&lt;update|create|delete&gt;&#39;, data: &lt;propertyValue&gt;}

So if `newObj.prop1 = &#39;new value&#39;` and `oldObj.prop1 = &#39;old value&#39;` it would set `returnObj.prop1 = {type: &#39;update&#39;, data: &#39;new value&#39;}`


### Update 2:

It gets truely hairy when we get to properties that are arrays, since the array `[1,2,3]` should be counted as equal to `[2,3,1]`, which is simple enough for arrays of value based types like string, int &amp; bool, but gets really difficult to handle when it comes to arrays of reference types like objects and arrays.

Example arrays that should be found equal:

    [1,[{c: 1},2,3],{a:&#39;hey&#39;}] and [{a:&#39;hey&#39;},1,[3,{c: 1},2]]

Not only is it quite complex to check for this type of deep value equality, but also to figure out a good way to represent the changes that might be.


Generic deep diff between two objects

I have an array of objects and I want to compare those objects on a specific object property. Here&#39;s my array:

    var myArray = [
        {&quot;ID&quot;: 1, &quot;Cost&quot;: 200},
        {&quot;ID&quot;: 2, &quot;Cost&quot;: 1000},
        {&quot;ID&quot;: 3, &quot;Cost&quot;: 50},
        {&quot;ID&quot;: 4, &quot;Cost&quot;: 500}
    ]

I&#39;d like to zero in on the &quot;cost&quot; specifically and a get a min and maximum value. I realize I can just grab the cost values and push them off into a javascript array and then run the [Fast JavaScript Max/Min][1].

However is there an easier way to do this by bypassing the array step in the middle and going off the objects properties (in this case &quot;Cost&quot;) directly?


  [1]: http://ejohn.org/blog/fast-javascript-maxmin/ &quot;Fast JavaScript Max/Min&quot;





Compare JavaScript Array of Objects to Get Min / Max

I want to design a program that can help me assess between 5 pre-defined colors which one is more similar to a variable color, and with what percentage.  The thing is that I don&#39;t know how to do that manually step by step. So it is even more difficult to think of a program.

More details: The colors are from photographs of tubes with gel that as different colors. I have 5 tubes with different colors were each is representative of 1 of 5 levels. I want to take photographs of other samples and on the computer assess to which level that sample belongs by comparing colors, and I want to know that with a percentage of approximation too. I would like a program that does something like this: http://www.colortools.net/color_matcher.html

If you can tell me what steps to take, even if they are things for me to think and do manually. It would be very helpful. 

How to compare two colors for similarity/difference

How do I check if two objects, e.g. dataframes, are value equal in R?

By value equal, I mean the value of each row of each column of one dataframe is equal to the value of the corresponding row and column in the second dataframe.

Compare if two dataframe objects in R are equal?

I saw many questions about this, and tried to solve the problem, but after one hour of googling and a lots of trial &amp; error, I still can&#39;t fix it. I hope some of you catch the problem.

This is what I get:

&lt;!-- language: none --&gt;

    java.lang.IllegalArgumentException: Comparison method violates its general contract!
    	at java.util.ComparableTimSort.mergeHi(ComparableTimSort.java:835)
    	at java.util.ComparableTimSort.mergeAt(ComparableTimSort.java:453)
    	at java.util.ComparableTimSort.mergeForceCollapse(ComparableTimSort.java:392)
    	at java.util.ComparableTimSort.sort(ComparableTimSort.java:191)
    	at java.util.ComparableTimSort.sort(ComparableTimSort.java:146)
    	at java.util.Arrays.sort(Arrays.java:472)
    	at java.util.Collections.sort(Collections.java:155)
        ...

And this is my comparator:

    @Override
    public int compareTo(Object o) {
        if(this == o){
            return 0;
        }
        
        CollectionItem item = (CollectionItem) o;

        Card card1 = CardCache.getInstance().getCard(cardId);
        Card card2 = CardCache.getInstance().getCard(item.getCardId());

        if (card1.getSet() &lt; card2.getSet()) {
            return -1;
        } else {
            if (card1.getSet() == card2.getSet()) {
                if (card1.getRarity() &lt; card2.getRarity()) {
                    return 1;
                } else {
                    if (card1.getId() == card2.getId()) {
                        if (cardType &gt; item.getCardType()) {
                            return 1;
                        } else {
                            if (cardType == item.getCardType()) {
                                return 0;
                            }
                            return -1;
                        }
                    }
                    return -1;
                }
            }
            return 1;
        }
    }

Any idea?

Content Type	Original Author	Original Content on Stackoverflow
Question	mustafa	View Question on Stackoverflow
Solution 1 - Binary	Mike Woinoski	View Answer on Stackoverflow
Solution 2 - Binary	Polynomial	View Answer on Stackoverflow
Solution 3 - Binary	Dimitry K	View Answer on Stackoverflow
Solution 4 - Binary	Boris Ivanov	View Answer on Stackoverflow
Solution 5 - Binary	BobC	View Answer on Stackoverflow
Solution 6 - Binary	Vladi	View Answer on Stackoverflow

Tool for comparing 2 binary files in Windows

Binary Problem Overview

Binary Solutions

Solution 1 - Binary

Solution 2 - Binary

Solution 3 - Binary

Solution 4 - Binary

Solution 5 - Binary

Solution 6 - Binary

Get the POST request body from HttpServletRequest

How to get the browser language using JavaScript

Attributions