murmur | Pure Java implementations of Murmur hash algorithms | Hashing library

 by   sangupta Java Version: 1.0.0 License: Apache-2.0

kandi X-RAY | murmur Summary

kandi X-RAY | murmur Summary

murmur is a Java library typically used in Security, Hashing applications. murmur has no bugs, it has no vulnerabilities, it has build file available, it has a Permissive License and it has low support. You can download it from GitHub, Maven.

murmur is a pure Java implementation of all Murmur hashes, namely, Murmur1, Murmur2 and Murmur3. The library is a direct Java implementation of the C++ source code. Hash generation has been 100% unit tested against the hashes generated using the C++ code. The library should help in building out bloom filters, or to just compute the hash for checking sanity of data, as Murmur3 is much faster than MD5 and SHA computations.

            kandi-support Support

              murmur has a low active ecosystem.
              It has 63 star(s) with 21 fork(s). There are 5 watchers for this library.
              It had no major release in the last 12 months.
              There are 3 open issues and 2 have been closed. On average issues are closed in 719 days. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of murmur is 1.0.0

            kandi-Quality Quality

              murmur has 0 bugs and 0 code smells.

            kandi-Security Security

              murmur has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              murmur code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              murmur is licensed under the Apache-2.0 License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              murmur releases are not available. You will need to build from source code and install.
              Deployable package is available in Maven.
              Build file is available. You can build the component from source.
              Installation instructions are not available. Examples and code snippets are available.

            Top functions reviewed by kandi - BETA

            kandi has reviewed murmur and discovered the below as its top functions. This is intended to give you an instant insight into murmur implemented functionality, and help decide if they suit your requirements.
            • Returns the Murmur3 hash of the data
            • Mix of 64 bits
            • Multiply the k1 of the k1
            • Mix k2
            • Returns a Murmur3 hash of the data
            • Modify a 64 - bit hash function
            • Rotate left bits
            Get all kandi verified functions for this library.

            murmur Key Features

            No Key Features are available at this moment for murmur.

            murmur Examples and Code Snippets

            Javadot img1Lines of Code : 33dot img1License : Permissive (Apache-2.0)
            copy iconCopy
             * Convert a given long value to byte-array.
             * @param x the long value
             * @return the byte[] array representation of it
            public static byte[] longToBytes(long x) {
            	ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES);
            	// The ByteOrd  
            Javadot img2Lines of Code : 18dot img2License : Permissive (Apache-2.0)
            copy iconCopy
            murmur - Pure Java implementation of the Murmur Hash algorithms
            Copyright (c) 2014-2018, Sandeep Gupta
            The project uses various other libraries that are subject to their
            own license terms. See the distribution libraries or the project
            Javadot img3Lines of Code : 13dot img3License : Permissive (Apache-2.0)
            copy iconCopy
            Intel i7-2660 CPU @ 3.40Ghz
            16-GB RAM
            Windows 7, 64-bit, Service Pack 1
            Oracle JDK 1.7.0_51 build 13, 64-bit Server VM
            OS X
            Intel i7-4870HQ CPU @ 2.50GHz
            16-GB RAM
            macOS Sierra 10.12.1
            Oracle JDK 1.8.0_101 build 13, 64-bit Serve  

            Community Discussions


            Can not create ReadWrite filesystem in kubernetes (ReadOnly mount)
            Asked 2021-Dec-31 at 04:17

            I currently am in the process of learning kubernetes, as such I have decided to start with an application that is simple (Mumble).


            My setup is simple, I have one node (the master) where I have removed the taint so mumble can be deployed on it. This single node is running CentOS Stream but SELinux is disabled.

            The issue

            The /srv/mumble directory appears to be ReadOnly, and at this point I have tried creating an init container to chown the directory but that fails due to the issue above. This issue appears in both containers, and I am unsure at this point how to change this to allow the mumble application to create files in said directory. The mumble application user runs as user 1000. What am I missing here?

            Configs ...


            Answered 2021-Dec-31 at 04:17

            command: ["sh", "-c", "chown -R 1000:1000 /srv/mumble"]

            Not the volume that is mounted as read-only, the ConfigMap is always mounted as read-only. Change the command to:

            command: ["sh", "-c", "chown 1000:1000 /srv/mumble"] will work.



            Google Translate web gives two different translations (chrome browser vs Selenium/chromedriver)
            Asked 2021-Dec-19 at 21:41

            I'm having a similar issue to this question, but with German. When I use a Chrome browser on my pc I get one translation (from, but with Selenium (in headless mode) I get a different translation.

            As an example, the following text gives two different results:

            • "Im Studienzimmer herrscht ein leises Murmeln der Studenten und ein etwas lauteres zischen der Chemikalien."
            1. Using Chrome browser:

              • "In the study room there is a soft murmur from the students and a somewhat louder hiss of the chemicals."
            2. Using Selenium:

              • "In the study room there is a quiet marbles of the students and a slightly louder hiss of the chemicals."

            Why does German "Murmeln" get translated as 'murmur' by the translation using Chrome browser, but as 'marbles' when accessing the same page using Selenium?



            Answered 2021-Dec-19 at 21:41

            Observing the HTML DOM the only difference I can see is in the value of jsdata

            With manual chrome browser:



            How to access json file data from js file
            Asked 2021-Jul-06 at 15:03

            I'm developing a discord bot and i wanted to send a random sentence from my dactylo.json file when the user sends a specific message. However, when trying to access data from this file, I get an "undefined" error like it couldn't read my json file. I looked over many previous questions but couldn't find an answer that helped me, even though it helped other people. I'm sure I'm missing something but I can't seem to find what...

            Here's my code from dactylo.json :



            Answered 2021-Jul-06 at 15:03

            You can simply import json file on the beginning:



            Implement a "Find all" algorithm that displays matched lines in a table, and jumps to line when table cell clicked
            Asked 2021-Mar-13 at 15:14

            I would like to implement functionality for being able to search a QPlainTextEdit for a query string, and display all matched lines in a table. Selecting a row in the table should move the cursor to the correct line in the document.

            Below is a working example that finds all matches and displays them in a table. How can I get to the selected line number in the string that the plaintextedit holds? I could instead use the match.capturedEnd() and match.capturedStart() to show the matches, but line numbers are a more intuitive thing to think of, rather than the character index matches.

            MWE (rather long sample text for fun) ...


            Answered 2021-Mar-13 at 15:14

            In order to move the cursor to a specified position, it's necessary to use the underlying QTextDocument using document().
            Through findBlockByLineNumber you can construct a QTextCursor and use setTextCursor() to "apply" that cursor (including the actual caret position) to the plain text.



            Parsing a .txt file and writing to excel in python
            Asked 2020-Dec-08 at 15:29

            I have a .txt file in the sample as below



            Answered 2020-Dec-08 at 13:06


            Best performing way to emulate integer overflow?
            Asked 2020-Sep-02 at 00:00

            I'm mucking about with hash functions, porting some classics like murmur or fnv families and creating my own, for fun, really. I know js isn't exactly an ideal environment for this but whatever.

            The biggest obstacle I run into is the fact that js uses doubles for most arithmetics. Almost every single hash function I've ever seen exploits integer overflow by multiplication. For example, I take the input of 7 and multiply it by some big prime like 0x5bd1e995, this multiplication amplifies the significance of that little input into every single bit of the result which is really neat for hash functions.

            Unfortunately this falls totally flat when using doubles to do the math because doubles won't overflow like integers (preserving least significant bits) but instead attempt to preserve the magnitude of the result (preserving most significant bits) and that screws with the design of almost any hash function.

            The few ways I've found to deal with this are to

            1. Modulo the input before multiplying to make sure the result doesn't exceed Number.MAX_SAFE_INTEGER
            2. Do the multiplication after splitting the input into two 16 bit values and recombine
            3. Use a variety of magic numbers depending on the input to make sure I stay in doubles range of integers

            Problem is though, none of these are fast and cut the performance into shreds. So, question time: Is there a well performing way to emulate integer overflow behavior in js in case of a multiplication that will almost definitely exceed Number.MAX_SAFE_INTEGER?



            Answered 2020-Sep-02 at 00:00

            Please look into Math.imul.

            This multiplies numbers as 32bit ints and simply truncates the overflow bits.



            ghc error: hidden package, but it's actually exposed
            Asked 2020-Aug-05 at 18:57

            I'm trying to use the package Parsec. When I run ghc Main.hs I get the error message:



            Answered 2020-Aug-05 at 18:57

            This looks like an issue with global vs local installs. Oh, and there it is in your ghc-pkg list output. You've got a multiuser ghc install and a single-user list of packages you've installed. Things work when you run ghc as a superuser because they won't see your local (per-user) installs.

            This is going to cause problems unless you use a tool to manage your environment for you. Both cabal and stack can handle this fine. I prefer cabal because it doesn't need coaxing to work with your preinstalled GHC, but this is a matter that has caused religious wars in the past. I won't argue against stack if you have a good resource for using it instead.



            PSET5 Speller Segmentation Fault
            Asked 2020-Jun-29 at 15:35
            // Implements a dictionary's functionality
            #include "dictionary.h"
            #define BASE 256
            //No of words in dicionary
            unsigned int SIZE = 0;
            // Represents a node in a hash table
            typedef struct node
                char word[LENGTH + 1];
                struct node *next;
            // Number of buckets in hash table
            const unsigned int N = 100800;
            // Hash table
            node *table[N];
            // Returns true if word is in dictionary else false
            bool check(const char *word)
                node *temp = NULL;
                char new_word[strlen(word) +1];
                strcpy(new_word, word);
                //Lowercase all words from the text to be spellchecked
                for(int i = 0; i < strlen(word); i++)
                    new_word[i] = tolower(new_word[i]);
                int n = hash(new_word);
                if( n > N)
                    n = n % N;
                temp = table[n];
                if (temp != NULL){
                //Traverse and check word
                while(temp != NULL)
                    if(strcasecmp(temp->word, new_word) == 0)
                        return true;
                    temp = temp->next;
                if (temp->next == NULL && strcasecmp(temp->word, new_word) == 0)
                    return true;
                return false;
            // Hashes word to a number
            unsigned int hash(const char *word)
                unsigned long h;
                unsigned const char *us;
                /* cast s to unsigned const char * */
                /* this ensures that elements of s will be treated as having values >= 0 */
                us = (unsigned const char *) word;
                h = 0;
                while(*us != '\0')
                    h = (h * BASE + *us) % N;
                return h;
            // Loads dictionary into memory, returning true if successful else false
            bool load(const char *dictionary)
                char w[LENGTH+1];
                FILE *file;
                file = fopen(dictionary, "r");
                if (file == NULL)
                    return false;
                while(fscanf(file, "%s\n", w) != EOF)
                    int n = hash(w);
                    if (n > N)
                        n = n % N;
                    //Incremet in the no of words
                    //Creating a new node to assign the word
                    node *nod = malloc(sizeof(node));
                    if(nod == NULL){
                        return false;
                    strcpy(nod->word, w);
                    //Adding the new node to main node
                    nod->next = table[n];
                    table[n] = nod;
                return true;
            // Returns number of words in dictionary if loaded else 0 if not yet loaded
            unsigned int size(void)
                //No of words from load function
                return SIZE;
            // Unloads dictionary from memory, returning true if successful else false
            bool unload(void)
                //Loopin through the array of linked ist
                for(int i = 0; i < N; i++)
                    node *temp = NULL;
                    node *cursor = NULL;
                    cursor = table[i];
                    while(cursor->next != NULL)
                        temp = cursor;
                        cursor = cursor->next;
                return true;


            Answered 2020-Jun-29 at 15:35

            This line in unload while(cursor->next != NULL) provokes the seg fault when table[i] is not populated. If no words are in that index, there is no such thing as cursor->next.



            Fastest Way to Find the Dot Product of a Large Matrix of Vectors
            Asked 2020-Jun-26 at 23:23

            I am looking for suggestions on the most efficient way to solve the following problem:

            I have two arrays called A and B. They are both of shape NxNx3. They represent two 2D matrix of positions, where each position is a vector of x, y, and z coordinates.

            I want to create a new array, called C, of shape NxN, where C[i, j] is the dot product of the vectors A[i, j] and B[i, j].

            Here are the solutions I've come up with so far. The first uses the numpy's einsum function (which is beautifully described here). The second uses numpy's broadcasting rules along with its sum function.



            Answered 2020-Jun-26 at 23:23

            With a bit of reshaping, we can use matmul. The idea is to treat the first 2 dimensions as the 'batch' dimensions, and to the dot on the last:



            Node.js application works on heroku but not if downloaded from github
            Asked 2020-Jun-01 at 15:14

            I have this project:

            This project is pushed via git from my local computer to Github. The project is able to run on Heroku if I deploy the local files. The problem is that when I download the Github project and try the exact same deploy strategy the result is different. The downloaded files are running fine locally, but Heroku don't like them. Is Github adding something I don't know of? Or what do you think could be the problem?

            This is the Heroku logs from the project when its downloaded via github:



            Answered 2020-Jun-01 at 12:53

            This is likely caused by case sensitivity. On line 7 of UserController.js you require ./User but the file is titled user.js. Heroku is likely case insensitive, whereas your file system is not. I imagine capitalizing the file name, or changing the require to all lowercase should resolve your issue here.


            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install murmur

            You can download it from GitHub, Maven.
            You can use murmur like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the murmur component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer For Gradle installation, please refer .


            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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