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server/vendor/github.com/pion/stun/checks.go

@@ -0,0 +1,53 @@
+// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+//go:build !debug
+// +build !debug
+
+package stun
+
+import (
+	"errors"
+
+	"github.com/pion/stun/internal/hmac"
+)
+
+// CheckSize returns ErrAttrSizeInvalid if got is not equal to expected.
+func CheckSize(_ AttrType, got, expected int) error {
+	if got == expected {
+		return nil
+	}
+	return ErrAttributeSizeInvalid
+}
+
+func checkHMAC(got, expected []byte) error {
+	if hmac.Equal(got, expected) {
+		return nil
+	}
+	return ErrIntegrityMismatch
+}
+
+func checkFingerprint(got, expected uint32) error {
+	if got == expected {
+		return nil
+	}
+	return ErrFingerprintMismatch
+}
+
+// IsAttrSizeInvalid returns true if error means that attribute size is invalid.
+func IsAttrSizeInvalid(err error) bool {
+	return errors.Is(err, ErrAttributeSizeInvalid)
+}
+
+// CheckOverflow returns ErrAttributeSizeOverflow if got is bigger that max.
+func CheckOverflow(_ AttrType, got, max int) error {
+	if got <= max {
+		return nil
+	}
+	return ErrAttributeSizeOverflow
+}
+
+// IsAttrSizeOverflow returns true if error means that attribute size is too big.
+func IsAttrSizeOverflow(err error) bool {
+	return errors.Is(err, ErrAttributeSizeOverflow)
+}