1 files changed, 62 insertions, 0 deletions
diff --git a/lib/nghttp3_range.c b/lib/nghttp3_range.c
new file mode 100644
index 0000000..0ce7148
--- /dev/null
+++ b/lib/nghttp3_range.c
@@ -0,0 +1,62 @@
+/*
+ * nghttp3
+ *
+ * Copyright (c) 2019 nghttp3 contributors
+ * 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 "nghttp3_range.h"
+#include "nghttp3_macro.h"
+
+void nghttp3_range_init(nghttp3_range *r, uint64_t begin, uint64_t end) {
+  r->begin = begin;
+  r->end = end;
+}
+
+nghttp3_range nghttp3_range_intersect(const nghttp3_range *a,
+                                      const nghttp3_range *b) {
+  nghttp3_range r = {0, 0};
+  uint64_t begin = nghttp3_max(a->begin, b->begin);
+  uint64_t end = nghttp3_min(a->end, b->end);
+  if (begin < end) {
+    nghttp3_range_init(&r, begin, end);
+  }
+  return r;
+}
+
+uint64_t nghttp3_range_len(const nghttp3_range *r) { return r->end - r->begin; }
+
+int nghttp3_range_eq(const nghttp3_range *a, const nghttp3_range *b) {
+  return a->begin == b->begin && a->end == b->end;
+}
+
+void nghttp3_range_cut(nghttp3_range *left, nghttp3_range *right,
+                       const nghttp3_range *a, const nghttp3_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 nghttp3_range_not_after(const nghttp3_range *a, const nghttp3_range *b) {
+  return a->end <= b->end;
+}