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/**
* node-crc32-stream
*
* Copyright (c) 2014 Chris Talkington, contributors.
* Licensed under the MIT license.
* https://github.com/archiverjs/node-crc32-stream/blob/master/LICENSE-MIT
*/
var inherits = require('util').inherits;
var Transform = require('readable-stream').Transform;
var crc32 = require('buffer-crc32');
var CRC32Stream = module.exports = function CRC32Stream(options) {
Transform.call(this, options);
this.checksum = new Buffer(4);
this.checksum.writeInt32BE(0, 0);
this.rawSize = 0;
};
inherits(CRC32Stream, Transform);
CRC32Stream.prototype._transform = function(chunk, encoding, callback) {
if (chunk) {
this.checksum = crc32(chunk, this.checksum);
this.rawSize += chunk.length;
}
callback(null, chunk);
};
CRC32Stream.prototype.digest = function() {
return crc32.unsigned(0, this.checksum);
};
CRC32Stream.prototype.hex = function() {
return this.digest().toString(16).toUpperCase();
};
CRC32Stream.prototype.size = function() {
return this.rawSize;
};
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