Add helper to read utf-16 encoded files in windows

Windows ini files are UTF-16LE encoded

Author: anjannath

go.mod

@@ -24,6 +24,7 @@ require (
 	github.com/xi2/xz v0.0.0-20171230120015-48954b6210f8
 	golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4
 	golang.org/x/sys v0.0.0-20190712062909-fae7ac547cb7
+	golang.org/x/text v0.3.0
 	gopkg.in/AlecAivazis/survey.v1 v1.8.5
 	howett.net/plist v0.0.0-20181124034731-591f970eefbb
 )

pkg/os/util_windows.go

@@ -0,0 +1,30 @@
+package os
+
+import (
+	"bytes"
+	"io/ioutil"
+
+	"golang.org/x/text/encoding/unicode"
+	"golang.org/x/text/transform"
+)
+
+// ReadFileUTF16LE reads a UTF-16LE file and returns in a []byte
+// ini/inf files in windows are of this format, reading a UTF-16
+// file directly without this would result in malformed texts
+func ReadFileUTF16LE(filename string) ([]byte, error) {
+	// Read the file into a []byte
+	raw, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	// Make an tranformer that converts MS-Win default to UTF8
+	win16le := unicode.UTF16(unicode.LittleEndian, unicode.IgnoreBOM)
+	// Make a transformer that is like win16le, but abides by BOM
+	utf16bom := unicode.BOMOverride(win16le.NewDecoder())
+
+	// Make a Reader that uses utf16bom
+	unicodeReader := transform.NewReader(bytes.NewReader(raw), utf16bom)
+	decoded, err := ioutil.ReadAll(unicodeReader)
+	return decoded, err
+}