First commit

vendor/github.com/tdewolff/minify/cmd/minify/util.go

@@ -0,0 +1,46 @@
+package main
+
+import "io"
+
+type countingReader struct {
+	io.Reader
+	N int
+}
+
+func (r *countingReader) Read(p []byte) (int, error) {
+	n, err := r.Reader.Read(p)
+	r.N += n
+	return n, err
+}
+
+type countingWriter struct {
+	io.Writer
+	N int
+}
+
+func (w *countingWriter) Write(p []byte) (int, error) {
+	n, err := w.Writer.Write(p)
+	w.N += n
+	return n, err
+}
+
+type prependReader struct {
+	io.ReadCloser
+	prepend []byte
+}
+
+func NewPrependReader(r io.ReadCloser, prepend []byte) *prependReader {
+	return &prependReader{r, prepend}
+}
+
+func (r *prependReader) Read(p []byte) (int, error) {
+	if r.prepend != nil {
+		n := copy(p, r.prepend)
+		if n != len(r.prepend) {
+			return n, io.ErrShortBuffer
+		}
+		r.prepend = nil
+		return n, nil
+	}
+	return r.ReadCloser.Read(p)
+}