From 2334f98c6e4d4575e59fb3148eae8918ec42669d Mon Sep 17 00:00:00 2001
From: Jason Crawford <jcrawford@dm78.org>
Date: Wed, 23 Dec 2020 15:04:25 -0800
Subject: [PATCH] Fix for windows-specific syscall

---
 music/tracked/mod/util.go       |  4 +---
 music/tracked/mod/util_linux.go |  8 ++++++++
 music/tracked/mod/util_win.go   | 10 ++++++++++
 3 files changed, 19 insertions(+), 3 deletions(-)
 create mode 100644 music/tracked/mod/util_linux.go
 create mode 100644 music/tracked/mod/util_win.go

diff --git a/music/tracked/mod/util.go b/music/tracked/mod/util.go
index 7604317..dbfd4b2 100644
--- a/music/tracked/mod/util.go
+++ b/music/tracked/mod/util.go
@@ -1,12 +1,10 @@
 package mod
 
-import "syscall"
-
 // WordLength is a count of WORD (uint16) sized values, stored in BigEndian format
 type WordLength uint16
 
 // Value returns the actual length described by this WordLength
 func (m WordLength) Value() int {
-	v := syscall.Ntohs(uint16(m))
+	v := BE16ToLE16(uint16(m))
 	return int(v) << 1
 }
diff --git a/music/tracked/mod/util_linux.go b/music/tracked/mod/util_linux.go
new file mode 100644
index 0000000..40a353d
--- /dev/null
+++ b/music/tracked/mod/util_linux.go
@@ -0,0 +1,8 @@
+// +build linux
+
+package mod
+
+// BE16ToLE16 converts a big-endian uint16 to a little-endian uint16
+func BE16ToLE16(be uint16) uint16 {
+	return uint16(be>>8) | (be << 8)
+}
diff --git a/music/tracked/mod/util_win.go b/music/tracked/mod/util_win.go
new file mode 100644
index 0000000..338789a
--- /dev/null
+++ b/music/tracked/mod/util_win.go
@@ -0,0 +1,10 @@
+// +build windows
+
+package mod
+
+import "syscall"
+
+// BE16ToLE16 converts a big-endian uint16 to a little-endian uint16
+func BE16ToLE16(be uint16) uint16 {
+	return syscall.Ntohs(be)
+}