Adding upstream version 2.5.1.

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

search/searcher/search_ip_range.go

@@ -0,0 +1,68 @@
+//  Copyright (c) 2014 Couchbase, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 		http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package searcher
+
+import (
+	"context"
+	"net"
+
+	"github.com/blevesearch/bleve/v2/search"
+	index "github.com/blevesearch/bleve_index_api"
+)
+
+// netLimits returns the lo and hi bounds inside the network.
+func netLimits(n *net.IPNet) (lo net.IP, hi net.IP) {
+	ones, bits := n.Mask.Size()
+	netNum := n.IP
+	if bits == net.IPv4len*8 {
+		netNum = netNum.To16()
+		ones += 8 * (net.IPv6len - net.IPv4len)
+	}
+	mask := net.CIDRMask(ones, 8*net.IPv6len)
+	lo = make(net.IP, net.IPv6len)
+	hi = make(net.IP, net.IPv6len)
+	for i := 0; i < net.IPv6len; i++ {
+		lo[i] = netNum[i] & mask[i]
+		hi[i] = lo[i] | ^mask[i]
+	}
+	return lo, hi
+}
+
+func NewIPRangeSearcher(ctx context.Context, indexReader index.IndexReader, ipNet *net.IPNet,
+	field string, boost float64, options search.SearcherOptions) (
+	search.Searcher, error) {
+
+	lo, hi := netLimits(ipNet)
+	fieldDict, err := indexReader.FieldDictRange(field, lo, hi)
+	if err != nil {
+		return nil, err
+	}
+	defer fieldDict.Close()
+
+	var terms []string
+	tfd, err := fieldDict.Next()
+	for err == nil && tfd != nil {
+		terms = append(terms, tfd.Term)
+		if tooManyClauses(len(terms)) {
+			return nil, tooManyClausesErr(field, len(terms))
+		}
+		tfd, err = fieldDict.Next()
+	}
+	if err != nil {
+		return nil, err
+	}
+
+	return NewMultiTermSearcher(ctx, indexReader, terms, field, boost, options, true)
+}