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node_modules/cbor/vendor/binary-parse-stream/README.md
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# binary-parse-stream
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Painless streaming binary protocol parsers using generators.
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## Installation
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npm install binary-parse-stream
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## Synchronous
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This module uses the exact same generator interface as [binary-parser](https://github.com/nathan7/binary-parser), which presents a synchronous interface to a generator parser.
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## Usage
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```javascript
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var BinaryParseStream = require('binary-parse-stream')
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, One = BinaryParseStream.One // -1
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```
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BinaryParseStream is a TransformStream that consumes buffers and outputs objects on the other end.
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It expects your subclass to implement a `_parse` method that is a generator.
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When your generator yields a number, it'll be fed a buffer of that length from the input.
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If it yields -1, it'll be given the value of the first byte instead of a single-byte buffer.
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When your generator returns, the return value will be pushed to the output side.
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## Example
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The following module parses a protocol that consists of a 32-bit unsigned big-endian type parameter, an unsigned 8-bit length parameter, and a buffer of the specified length.
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It outputs `{type, buf}` objects.
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```js
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var BinaryParseStream = require('binary-parse-stream')
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, inherits = require('util').inherits
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module.exports = SillyProtocolParseStream
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inherits(SillyProtocolParseStream, BinaryParseStream)
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function SillyProtocolParseStream(options) {
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BinaryParseStream.call(this, options)
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}
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SillyProtocolParseStream.prototype._parse = function*() {
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var type = (yield 4).readUInt32BE(0, true)
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, length = yield -1
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, buf = yield length
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return { type: type, buf: buf }
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}
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```
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There is also a shorter syntax for when you don't want to explicitly subclass: `BinaryParseStream.extend(function*())`.
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