1 files changed, 70 insertions, 0 deletions
diff --git a/goldap/filter.go b/goldap/filter.go
new file mode 100644
index 0000000..ba045ad
--- /dev/null
+++ b/goldap/filter.go
@@ -0,0 +1,70 @@
+package message
+
+import "fmt"
+
+//
+//        Filter ::= CHOICE {
+//             and             [0] SET SIZE (1..MAX) OF filter Filter,
+//             or              [1] SET SIZE (1..MAX) OF filter Filter,
+//             not             [2] Filter,
+//             equalityMatch   [3] AttributeValueAssertion,
+//
+//
+//
+//Sermersheim                 Standards Track                    [Page 57]
+//
+//
+//RFC 4511                         LDAPv3                        June 2006
+//
+//
+//             substrings      [4] SubstringFilter,
+//             greaterOrEqual  [5] AttributeValueAssertion,
+//             lessOrEqual     [6] AttributeValueAssertion,
+//             present         [7] AttributeDescription,
+//             approxMatch     [8] AttributeValueAssertion,
+//             extensibleMatch [9] MatchingRuleAssertion,
+//             ...  }
+
+func readFilter(bytes *Bytes) (filter Filter, err error) {
+	var tagAndLength TagAndLength
+	tagAndLength, err = bytes.PreviewTagAndLength()
+	if err != nil {
+		err = LdapError{fmt.Sprintf("readFilter:\n%s", err.Error())}
+		return
+	}
+	err = tagAndLength.ExpectClass(classContextSpecific)
+	if err != nil {
+		err = LdapError{fmt.Sprintf("readFilter:\n%s", err.Error())}
+		return
+	}
+	switch tagAndLength.Tag {
+	case TagFilterAnd:
+		filter, err = readFilterAnd(bytes)
+	case TagFilterOr:
+		filter, err = readFilterOr(bytes)
+	case TagFilterNot:
+		filter, err = readFilterNot(bytes)
+	case TagFilterEqualityMatch:
+		filter, err = readFilterEqualityMatch(bytes)
+	case TagFilterSubstrings:
+		filter, err = readFilterSubstrings(bytes)
+	case TagFilterGreaterOrEqual:
+		filter, err = readFilterGreaterOrEqual(bytes)
+	case TagFilterLessOrEqual:
+		filter, err = readFilterLessOrEqual(bytes)
+	case TagFilterPresent:
+		filter, err = readFilterPresent(bytes)
+	case TagFilterApproxMatch:
+		filter, err = readFilterApproxMatch(bytes)
+	case TagFilterExtensibleMatch:
+		filter, err = readFilterExtensibleMatch(bytes)
+	default:
+		err = LdapError{fmt.Sprintf("readFilter: invalid tag value %d for filter", tagAndLength.Tag)}
+		return
+	}
+	if err != nil {
+		err = LdapError{fmt.Sprintf("readFilter:\n%s", err.Error())}
+		return
+	}
+	return
+}