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| author | Florian Dold <florian.dold@gmail.com> | 2016-10-10 03:43:44 +0200 |
|---|---|---|
| committer | Florian Dold <florian.dold@gmail.com> | 2016-10-10 03:43:44 +0200 |
| commit | abd94a7f5a50f43c797a11b53549ae48fff667c3 (patch) | |
| tree | ab8ed457f65cdd72e13e0571d2975729428f1551 /node_modules/crc32-stream/lib/crc32-stream.js | |
| parent | a0247c6a3fd6a09a41a7e35a3441324c4dcb58be (diff) | |
| download | wallet-core-abd94a7f5a50f43c797a11b53549ae48fff667c3.tar.xz | |
add node_modules to address #4364
Diffstat (limited to 'node_modules/crc32-stream/lib/crc32-stream.js')
| -rw-r--r-- | node_modules/crc32-stream/lib/crc32-stream.js | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/node_modules/crc32-stream/lib/crc32-stream.js b/node_modules/crc32-stream/lib/crc32-stream.js new file mode 100644 index 000000000..42cb45400 --- /dev/null +++ b/node_modules/crc32-stream/lib/crc32-stream.js @@ -0,0 +1,42 @@ +/**
+ * 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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