Initial

test/imaps/node_modules/mailparser/lib/stream-hash.js

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+'use strict';
+
+const crypto = require('crypto');
+const Transform = require('stream').Transform;
+
+class StreamHash extends Transform {
+    constructor(attachment, algo) {
+        super();
+        this.attachment = attachment;
+        this.algo = (algo || 'md5').toLowerCase();
+        this.hash = crypto.createHash(algo);
+        this.byteCount = 0;
+    }
+
+    _transform(chunk, encoding, done) {
+        this.hash.update(chunk);
+        this.byteCount += chunk.length;
+        done(null, chunk);
+    }
+
+    _flush(done) {
+        this.attachment.checksum = this.hash.digest('hex');
+        this.attachment.size = this.byteCount;
+        done();
+    }
+}
+
+module.exports = StreamHash;