1 files changed, 47 insertions, 0 deletions
diff --git a/src/zerror.js b/src/zerror.js
new file mode 100644
index 0000000..1a779de
--- /dev/null
+++ b/src/zerror.js
@@ -0,0 +1,47 @@
+"use strict";
+
+var Zmodem = module.exports;
+
+function _crc_message(got, expected) {
+    this.got = got.slice(0);
+    this.expected = expected.slice(0);
+    return "CRC check failed! (got: " + got.join() + "; expected: " + expected.join() + ")";
+}
+
+function _pass(val) { return val }
+
+const TYPE_MESSAGE = {
+    aborted: "Session aborted",
+    peer_aborted: "Peer aborted session",
+    already_aborted: "Session already aborted",
+    crc: _crc_message,
+    validation: _pass,
+};
+
+function _generate_message(type) {
+    const msg = TYPE_MESSAGE[type];
+    switch (typeof msg) {
+        case "string":
+            return msg;
+        case "function":
+            var args_after_type = [].slice.call(arguments).slice(1);
+            return msg.apply(this, args_after_type);
+    }
+
+    return null;
+}
+
+Zmodem.Error = class ZmodemError extends Error {
+    constructor(msg_or_type) {
+        super();
+
+        var generated = _generate_message.apply(this, arguments);
+        if (generated) {
+            this.type = msg_or_type;
+            this.message = generated;
+        }
+        else {
+            this.message = msg_or_type;
+        }
+    }
+};