Adding upstream version 2.52.6.

Signed-off-by: Daniel Baumann <daniel@debian.org>

utils/strings.go

@@ -0,0 +1,75 @@
+// ⚡️ Fiber is an Express inspired web framework written in Go with ☕️
+// 🤖 Github Repository: https://github.com/gofiber/fiber
+// 📌 API Documentation: https://docs.gofiber.io
+
+package utils
+
+// ToLower converts ascii string to lower-case
+func ToLower(b string) string {
+	res := make([]byte, len(b))
+	copy(res, b)
+	for i := 0; i < len(res); i++ {
+		res[i] = toLowerTable[res[i]]
+	}
+
+	return UnsafeString(res)
+}
+
+// ToUpper converts ascii string to upper-case
+func ToUpper(b string) string {
+	res := make([]byte, len(b))
+	copy(res, b)
+	for i := 0; i < len(res); i++ {
+		res[i] = toUpperTable[res[i]]
+	}
+
+	return UnsafeString(res)
+}
+
+// TrimLeft is the equivalent of strings.TrimLeft
+func TrimLeft(s string, cutset byte) string {
+	lenStr, start := len(s), 0
+	for start < lenStr && s[start] == cutset {
+		start++
+	}
+	return s[start:]
+}
+
+// Trim is the equivalent of strings.Trim
+func Trim(s string, cutset byte) string {
+	i, j := 0, len(s)-1
+	for ; i <= j; i++ {
+		if s[i] != cutset {
+			break
+		}
+	}
+	for ; i < j; j-- {
+		if s[j] != cutset {
+			break
+		}
+	}
+
+	return s[i : j+1]
+}
+
+// TrimRight is the equivalent of strings.TrimRight
+func TrimRight(s string, cutset byte) string {
+	lenStr := len(s)
+	for lenStr > 0 && s[lenStr-1] == cutset {
+		lenStr--
+	}
+	return s[:lenStr]
+}
+
+// EqualFold tests ascii strings for equality case-insensitively
+func EqualFold(b, s string) bool {
+	if len(b) != len(s) {
+		return false
+	}
+	for i := len(b) - 1; i >= 0; i-- {
+		if toUpperTable[b[i]] != toUpperTable[s[i]] {
+			return false
+		}
+	}
+	return true
+}