added a way to read a signed int to correctly read the key signature …

…meta event
gasman · Jan 2, 2013 · 18da67a · 18da67a
1 parent ee4a320
commit 18da67a
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Showing 2 changed files with 3 additions and 2 deletions.
diff --git a/midifile.js b/midifile.js
@@ -102,7 +102,7 @@ function MidiFile(data) {
 					case 0x59:
 						event.subtype = 'keySignature';
 						if (length != 2) throw "Expected length for keySignature event is 2, got " + length;
-						event.key = stream.readInt8();
+						event.key = stream.readInt8(true);
 						event.scale = stream.readInt8();
 						return event;
 					case 0x7f:

diff --git a/stream.js b/stream.js
@@ -29,8 +29,9 @@ function Stream(str) {
 	}
 
 	/* read an 8-bit integer */
-	function readInt8() {
+	function readInt8(signed) {
 		var result = str.charCodeAt(position);
+    if (signed && result > 127) result -= 256;
 		position += 1;
 		return result;
 	}