1 files changed, 61 insertions, 0 deletions
diff --git a/lib/ngtcp2_range.c b/lib/ngtcp2_range.c
new file mode 100644
index 0000000..9379496
--- /dev/null
+++ b/lib/ngtcp2_range.c
@@ -0,0 +1,61 @@
+/*
+ * ngtcp2
+ *
+ * Copyright (c) 2017 ngtcp2 contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#include "ngtcp2_range.h"
+#include "ngtcp2_macro.h"
+
+void ngtcp2_range_init(ngtcp2_range *r, uint64_t begin, uint64_t end) {
+  r->begin = begin;
+  r->end = end;
+}
+
+ngtcp2_range ngtcp2_range_intersect(const ngtcp2_range *a,
+                                    const ngtcp2_range *b) {
+  ngtcp2_range r = {0, 0};
+  uint64_t begin = ngtcp2_max(a->begin, b->begin);
+  uint64_t end = ngtcp2_min(a->end, b->end);
+  if (begin < end) {
+    ngtcp2_range_init(&r, begin, end);
+  }
+  return r;
+}
+
+uint64_t ngtcp2_range_len(const ngtcp2_range *r) { return r->end - r->begin; }
+
+int ngtcp2_range_eq(const ngtcp2_range *a, const ngtcp2_range *b) {
+  return a->begin == b->begin && a->end == b->end;
+}
+
+void ngtcp2_range_cut(ngtcp2_range *left, ngtcp2_range *right,
+                      const ngtcp2_range *a, const ngtcp2_range *b) {
+  /* Assume that b is included in a */
+  left->begin = a->begin;
+  left->end = b->begin;
+  right->begin = b->end;
+  right->end = a->end;
+}
+
+int ngtcp2_range_not_after(const ngtcp2_range *a, const ngtcp2_range *b) {
+  return a->end <= b->end;
+}