1 files changed, 78 insertions, 0 deletions
diff --git a/src/buffer.h b/src/buffer.h
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+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2014 Tatsuhiro Tsujikawa
+ *
+ * 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.
+ */
+#ifndef BUFFER_H
+#define BUFFER_H
+
+#include "nghttp2_config.h"
+
+#include <cstring>
+#include <algorithm>
+#include <array>
+
+namespace nghttp2 {
+
+template <size_t N> struct Buffer {
+  Buffer() : pos(std::begin(buf)), last(pos) {}
+  // Returns the number of bytes to read.
+  size_t rleft() const { return last - pos; }
+  // Returns the number of bytes this buffer can store.
+  size_t wleft() const { return std::end(buf) - last; }
+  // Writes up to min(wleft(), |count|) bytes from buffer pointed by
+  // |src|.  Returns number of bytes written.
+  size_t write(const void *src, size_t count) {
+    count = std::min(count, wleft());
+    auto p = static_cast<const uint8_t *>(src);
+    last = std::copy_n(p, count, last);
+    return count;
+  }
+  size_t write(size_t count) {
+    count = std::min(count, wleft());
+    last += count;
+    return count;
+  }
+  // Drains min(rleft(), |count|) bytes from start of the buffer.
+  size_t drain(size_t count) {
+    count = std::min(count, rleft());
+    pos += count;
+    return count;
+  }
+  size_t drain_reset(size_t count) {
+    count = std::min(count, rleft());
+    std::copy(pos + count, last, std::begin(buf));
+    last = std::begin(buf) + (last - (pos + count));
+    pos = std::begin(buf);
+    return count;
+  }
+  void reset() { pos = last = std::begin(buf); }
+  uint8_t *begin() { return std::begin(buf); }
+  uint8_t &operator[](size_t n) { return buf[n]; }
+  const uint8_t &operator[](size_t n) const { return buf[n]; }
+  std::array<uint8_t, N> buf;
+  uint8_t *pos, *last;
+};
+
+} // namespace nghttp2
+
+#endif // BUFFER_H