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# Javascript implementation of xxHash ## Synopsis xxHash is a very fast hashing algorithm (see the details [here](https://code.google.com/p/xxhash/)). xxhashjs is a Javascript implementation of it, written in 100% Javascript. Although not as fast as the C version, it does perform pretty well given the current Javascript limitations in handling unsigned 32 bits integers. ## Installation In nodejs: npm install xxhashjs In the browser, include the following, and access the constructor with _XXH_: ```javascript <script src="/your/path/to/xxhash.js"></script> ``` ## Examples * In one step: ```javascript var h = XXH.h32( 'abcd', 0xABCD ).toString(16) // seed = 0xABCD ``` > 0xCDA8FAE4 * In several steps (useful in conjunction of NodeJS streams): ```javascript var H = XXH.h32( 0xABCD ) // seed = 0xABCD var h = H.update( 'abcd' ).digest().toString(16) ``` > 0xCDA8FAE4 * More examples in the examples directory: * Compute xxHash from a file data * Use xxHashjs in the browser ## Usage * XXH makes 2 functions available for 32 bits XXH and 64 bits XXH respectively, with the same signature: * XXH.h32 * XXH.h64 * In one step: `XXH.h32(<data>, <seed>)` The data can either be a string, an ArrayBuffer or a NodeJS Buffer object. The seed can either be a number or a UINT32 object. * In several steps: * instantiate a new XXH object H: `XXH.h32(<seed>)` or `XXH.h32()` The seed can be set later on with the `init` method * add data to the hash calculation: `H.update(<data>)` * finish the calculations: `H.digest()` The object returned can be converted to a string with `toString(<radix>)` or a number `toNumber()`. Once `digest()` has been called, the object can be reused. The same seed will be used or it can be changed with `init(<seed>)`. ## Methods * `XXH.h32()` * `.init(<seed>)` Initialize the XXH object with the given seed. The seed can either be a number or a UINT32 object. * `.update(<data>)` Add data for hashing. The data can either be a string, an ArrayBuffer or a NodeJS Buffer object. * `digest()` (_UINT32_) Finalize the hash calculations and returns an UINT32 object. The hash value can be retrieved with toString(<radix>). * `XXH.h64()` * `.init(<seed>)` Initialize the XXH object with the given seed. The seed can either be a number or a UINT64 object. * `.update(<data>)` Add data for hashing. The data can either be a string, an ArrayBuffer or a NodeJS Buffer object. * `.digest()` (_UINT64_) Finalize the hash calculations and returns an UINT64 object. The hash value can be retrieved with toString(<radix>). ## License MIT