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streamsearch
Advanced tools
The streamsearch npm package is primarily used for searching for a specific sequence of bytes in a streaming data source. It is particularly useful for parsing streams to find delimiters or separators, such as in multipart/form-data streams where boundaries need to be identified. This package provides a fast and efficient way to scan through data without buffering the entire stream, making it ideal for handling large volumes of data in real-time.
Byte sequence searching in streams
This feature allows the user to search for a specific byte sequence within a stream. The example code initializes a StreamSearch instance with a needle ('example') and pushes a buffer to it. It listens for 'info' events to detect matches and outputs whether the needle was found in the provided data.
const StreamSearch = require('streamsearch');
let needle = Buffer.from('example');
let s = new StreamSearch(needle);
s.on('info', (isMatch, data, start, end) => {
console.log('Data:', data);
console.log('Match found:', isMatch);
});
// Simulate streaming data
s.push(Buffer.from('some example data containing the needle'));
Similar to streamsearch, buffer-indexof provides functionality to find the index of a buffer within another buffer. However, it does not support streaming data inherently and is used for buffer objects in memory, which might not be as efficient for large or streaming datasets compared to streamsearch.
streamsearch is a module for node.js that allows searching a stream using the Boyer-Moore-Horspool algorithm.
This module is based heavily on the Streaming Boyer-Moore-Horspool C++ implementation by Hongli Lai here.
npm install streamsearch
var StreamSearch = require('streamsearch'),
inspect = require('util').inspect;
var needle = new Buffer([13, 10]), // CRLF
s = new StreamSearch(needle),
chunks = [
new Buffer('foo'),
new Buffer(' bar'),
new Buffer('\r'),
new Buffer('\n'),
new Buffer('baz, hello\r'),
new Buffer('\n world.'),
new Buffer('\r\n Node.JS rules!!\r\n\r\n')
];
s.on('info', function(isMatch, data, start, end) {
if (data)
console.log('data: ' + inspect(data.toString('ascii', start, end)));
if (isMatch)
console.log('match!');
});
for (var i = 0, len = chunks.length; i < len; ++i)
s.push(chunks[i]);
// output:
//
// data: 'foo'
// data: ' bar'
// match!
// data: 'baz, hello'
// match!
// data: ' world.'
// match!
// data: ' Node.JS rules!!'
// match!
// data: ''
// match!
chunk
of data may be available that did not match the needle. Data (if available) is in chunk
between start
(inclusive) and end
(exclusive).maxMatches - < integer > - The maximum number of matches. Defaults to Infinity.
matches - < integer > - The current match count.
(constructor)(< mixed >needle) - Creates and returns a new instance for searching for a Buffer or string needle
.
push(< Buffer >chunk) - integer - Processes chunk
. The return value is the last processed index in chunk
+ 1.
reset() - (void) - Resets internal state. Useful for when you wish to start searching a new/different stream for example.
FAQs
Streaming Boyer-Moore-Horspool searching for node.js
The npm package streamsearch receives a total of 11,526,726 weekly downloads. As such, streamsearch popularity was classified as popular.
We found that streamsearch demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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