memf | Portable scanf/printf-like functions to marshal binary data | Runtime Evironment library

by clausecker C Version: Current License: BSD-2-Clause

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | memf Summary

memf is a C library typically used in Server, Runtime Evironment, Nodejs applications. memf has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

This project contains an experimental set of functions to marshall data from binary files into in-memory structures in an easy and portable way. The interface is similar to that of scanf and printf: Provide a structure you want to marshall your data into and call a function from this family with a pointer to such a structure, a data source / drain and a string describing the fields of the structure and the rest happens automatically. No long-winded marshalling code is needed.

Support

Quality

Security

License

Reuse

Support

memf has a low active ecosystem.

It has 51 star(s) with 4 fork(s). There are 5 watchers for this library.

It had no major release in the last 6 months.

memf has no issues reported. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of memf is current.

Quality

memf has no bugs reported.

Security

memf has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

memf is licensed under the BSD-2-Clause License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

memf releases are not available. You will need to build from source code and install.

Installation instructions, examples and code snippets are available.

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memf Key Features

No Key Features are available at this moment for memf.

memf Examples and Code Snippets

No Code Snippets are available at this moment for memf.

Community Discussions

Trending Discussions on memf

Emscripten: is IDBFS more RAM efficient than MEMFS?

Need help understanding Makefile in xv6

npm run production error : "unknown option no-progress"

Cant use range in golang

How can I load a file from a HTML input into Emscripten's MEMFS file system?

Android Recyclerview not appearing until EditText box touched

Android Firebase addOnChildListener Fatal Exception "print-in needs message" and No setter/field

Add memoization to a recursively defined haskell function

How to get the correct result file data if I use Web Worker on ffmpeg.js?

How to work with memory mapped files (numpy.memmap) in PyFilesystem?

QUESTION

Emscripten: is IDBFS more RAM efficient than MEMFS?

Asked 2021-Jun-01 at 22:01

I am packaging the data for my WebAssembly game using emcc --preload-file command, which puts it into MEMFS and keeps it in RAM until the webpage is closed.

The game typically opens a file, reads it's contents, closes it, and never touches the file again, it is not using mmap.

Would it be more memory efficient to download all game data into IndexedDB / Emscripten IDBFS on first launch? Does the web browser load the whole IndexedDB into RAM, does it free up RAM after the file in IDBFS was closed?

My target hardware is Safari on iPhone XS with 2GB RAM, and the game data is around 60 MB.

...

ANSWER

Answered 2021-Jun-01 at 22:01

As you mentioned, MEMFS is an in-memory "filesystem" and it works in any browser. IndexedDB is a proper database and it's optimal use-case is for storing large amounts of data (more than what can fit in RAM).

Often times when an app or website is loaded for the first time there's a lot of API calls, authentication, and other work that needs to be done. Doing this every time the application opens up is not optimal so IndexedDB can be used as a way to speed up repeated visits. This way, the latest app state could be stored in IndexedDB and the app can then sync in the background (see stale-while-revalidate).

If you think your game could benefit from this, then you could consider using it. If you think you could also do this would MEMFS, however, I would recommend that since IndexedDB has some nuances.

In the specific case of safari on IOS, you can't store blobs in IndexedDB. You can, however, convert the blob into an ArrayBuffer but you'll also have to store the MIME type alongside the buffer in order to do the conversion correctly (since ArrayBuffer doesn't have a MIME type but blob does).

Writing to storage in IndexedDB may also fail. This could happen for a variety of reasons. Maybe the user is using private mode, or maybe they don't have enough disk space.

If the user clears their cache on their phone, the IndexedDB data may be cleared as well. You may need to handle this.

I've run into some of these errors in the past using IndexedDB and it can be a headache. I would recommend Memfs.

As for the implementation details of IDBFS, it may or may not remain constant across browsers and platforms. What I can say for sure, however, is that unless you are saving a lot of data that needs to be computed in your first application, try profiling memfs and if it works well enough, then you can stick with it.

Source https://stackoverflow.com/questions/67436377

QUESTION

Need help understanding Makefile in xv6

Asked 2021-Mar-25 at 21:59

I have been reading the makefile of xv6 project. I want to put all the user programs into a folder to keep the project tidy. I can not find where it compiles the user programs. I know that when i run: make fs.img; it will compile the user programs, but i can not find any commands to do so. I also want all the kernel code to go into a directory called "kernel".
Is there a feature in make that allows automatic compilation or is there just something I'm not seeing. And could anyone suggest any make docs to help me understand this makefile.

My Makefile:

...

ANSWER

Answered 2021-Mar-25 at 12:30

All make systems (as required by POSIX) have a number of built-in rules including rules that know how to compile object files from C files.

For information on GNU make's built-in rules you can review the manual.

Source https://stackoverflow.com/questions/66795490

QUESTION

npm run production error : "unknown option no-progress"

Asked 2021-Jan-31 at 07:24

I am trying to run the command npm run dev or npm run production. But none of them are successful. Once I run the command I am getting an error like in image :

error after running npm run prod

My package.json file is like below :

...

ANSWER

Answered 2021-Jan-31 at 07:24

Laravel Mix 6 removes a number of options from the CLI. You will need to update the scripts section of your package.json file accordingly.

See Update Your NPM Scripts
https://laravel-mix.com/docs/6.0/upgrade#update-your-npm-scripts

Before:

Source https://stackoverflow.com/questions/65976497

QUESTION

Cant use range in golang

Asked 2020-Dec-24 at 15:16

For some reason I cant iterate with range

...

ANSWER

Answered 2020-Dec-24 at 15:16

What I see is that your saving logic is faulty, and I suspect you aren’t able to iterate the map because it is in fact empty.

Here

Source https://stackoverflow.com/questions/65438269

QUESTION

How can I load a file from a HTML input into Emscripten's MEMFS file system?

Asked 2020-May-03 at 19:22

I have an HTML input like this . I want to load the file into Emscripten's MEMFS file system. Looking at the Emscripten file API I have been trying to use FS.mount() to do so.

However, the documentation only gives an example of using mount using WORKERFS, so I tried playing around with it like this.

...

ANSWER

Answered 2020-May-03 at 19:22

Here is what I ended up doing–

input_test.html for file input:

Source https://stackoverflow.com/questions/61496876

QUESTION

Android Recyclerview not appearing until EditText box touched

Asked 2019-Nov-26 at 18:20

Okay. So I'm having a problem that's very similar to the one in this thread (though that solution didn't work for me): RecyclerView not populated until SearchView interaction

I have a recyclerview that's populated by Objects coming from a Firebase listener. The objects are coming in just fine (I see them in the log) but my recyclerview doesn't appear until I touch the "EditText" field. I don't actually even have to send or even type anything... I just touch the box and then the recyclerview appears... but not before.

I've tried a few different things (including the accepted answer on that question and a few others here). And I've tried setting the focus to that box from the very beginning... but nothing seems to help.

Here's the code for the layout:

...

ANSWER

Answered 2019-Sep-15 at 10:04

I will help you! you need to write a function in your MessageListAdapter adapter

Source https://stackoverflow.com/questions/57942898

QUESTION

Android Firebase addOnChildListener Fatal Exception "print-in needs message" and No setter/field

Asked 2019-Sep-13 at 18:43

I believe I have everything setup correctly, in fact, it even works! I get results in the log until it crashes.

I really don't understand what's going on.

In the database:

...

ANSWER

Answered 2019-Sep-13 at 17:45

You getter-setters are missing

When using .getValue(), note that:

This method is used to marshall the data contained in this snapshot into a class of your choosing. The class must fit 2 simple constraints:

The class must have a default constructor that takes no arguments

The class must define public getters for the properties to be assigned. Properties without a public getter will be set to their default value when an instance is deserialized

I suggest that after defining the class variable just do Alt+Insert (Command+N for Mac) in Android Studio to generate the public getters-setters.

Your class should ideally look like:

Source https://stackoverflow.com/questions/57927932

QUESTION

Add memoization to a recursively defined haskell function

Asked 2019-Jul-20 at 21:56

I've solved a dynamic programming problem in Haskell (actually a Project Euler problem) with what boils down to a generalisation of the Fibonacci sequence:

...

ANSWER

Answered 2019-Jul-20 at 21:56

You need another binding to avoid the recursive call to mem d:

Source https://stackoverflow.com/questions/57128819

QUESTION

How to get the correct result file data if I use Web Worker on ffmpeg.js?

Asked 2019-Apr-23 at 17:09

I have tried to use FFMPEG.js (https://github.com/Kagami/ffmpeg.js) to convert mp3 files on the browser/client side, and I followed the usage of the page of Web Worker. However, the worker works well on the converting and it seems the file has been converted, but I cannot get the correct result file data back.

Here my code is:

...

ANSWER

Answered 2019-Apr-23 at 17:09

You should be listening for done message. Something like that would suffice:

Source https://stackoverflow.com/questions/55511382

QUESTION

How to work with memory mapped files (numpy.memmap) in PyFilesystem?

Asked 2019-Mar-13 at 22:55

Can I use PyFilesystem with numpy memory mapped files? The sample code below throws io.UnsupportedOperation: fileno which is due to PyFilesystem throwing the unsupported exception for the fileno operation on the IO Stream object.

...

ANSWER

Answered 2019-Mar-13 at 16:09

It appears memory mapping to a MemoryFS is a bit too abstract. This works fine using a TempFS which writes to the system temp dir on the OS storage medium.

Source https://stackoverflow.com/questions/55134134

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

Vulnerabilities

No vulnerabilities reported

Install memf

To build this project, execute. in the top source directory. This creates a static library libmemf.a in the src directory and then runs the test suite on this library. This process is subject to change.

Support

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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