slidingwindow's Introduction
Sliding window protocol with "selective repeat" Sender (send.c): Calculates the window size according to the formula, then divides the file size into packages. Sends the first number of packages and packages that fit in the first window (all the file if it fits in one window), then wait for a response from the Receiver that will send you NACK (id) -> resends the selected frame and keeps track that a it was necessary to send it again in the "toresend" variable. Otherwise, the Receiver will send the ACK (id), in which case we will check if it is the ack corresponding to the frame representing the beginning of the sliding window. If it is the expected ack we send the following frame, increasing the upperedge (id corresponding to the end of the sliding window), otherwise we read the following frame from the file and send it and we updated the expected ack id with the received id. Thus we send the entire file storing it in frames, we do so to be able to send back the lost frames if needed. After we finish sending the whole file, we wait to see if the program has received ack for the rest of the packages. The sender will stop when all ack's have been received. Receiver (recv.c): We test each received frame to see if it is the expected frame (ackexpected - the beginning of the sliding window). We check if the id is corrupt, otherwise we check if the package is corrupt (checksum check), if it has corrupted, we send NACK (N), with the respective id. If the received package is good, we store the frames in the frame buffer. We check if it is a frame corresponding to the window limits. If it is a frame inside the window we check if we have lost frames, if so we restart the counter because the ack / nacks for the losses have already been registered, otherwise we write in the file the frame. The receiver will stop when all packets have been received. Remarks: The verification of corruption is done by checksum (byte that stores the modulo 2 amount of all the bytes in the package) The reordering and the loss will be realized with the help of "ackexpected" in the Receiver, who remembers which package (the corresponding id) will have to be received and written to the file in the next step, so you will also notice the loss of a package. It will also use the auxiliary function setFrame, which sets the data of a package (id, checksum and payload).
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
๐ Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. ๐๐๐
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google โค๏ธ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.