1 files changed, 122 insertions, 0 deletions
diff --git a/lib/nghttp2_helper.h b/lib/nghttp2_helper.h
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+++ b/lib/nghttp2_helper.h
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+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2012 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 NGHTTP2_HELPER_H
+#define NGHTTP2_HELPER_H
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif /* HAVE_CONFIG_H */
+
+#include <string.h>
+#include <stddef.h>
+
+#include <nghttp2/nghttp2.h>
+#include "nghttp2_mem.h"
+
+#define nghttp2_min(A, B) ((A) < (B) ? (A) : (B))
+#define nghttp2_max(A, B) ((A) > (B) ? (A) : (B))
+
+#define lstreq(A, B, N) ((sizeof((A)) - 1) == (N) && memcmp((A), (B), (N)) == 0)
+
+#define nghttp2_struct_of(ptr, type, member)                                   \
+  ((type *)(void *)((char *)(ptr)-offsetof(type, member)))
+
+/*
+ * Copies 2 byte unsigned integer |n| in host byte order to |buf| in
+ * network byte order.
+ */
+void nghttp2_put_uint16be(uint8_t *buf, uint16_t n);
+
+/*
+ * Copies 4 byte unsigned integer |n| in host byte order to |buf| in
+ * network byte order.
+ */
+void nghttp2_put_uint32be(uint8_t *buf, uint32_t n);
+
+/*
+ * Retrieves 2 byte unsigned integer stored in |data| in network byte
+ * order and returns it in host byte order.
+ */
+uint16_t nghttp2_get_uint16(const uint8_t *data);
+
+/*
+ * Retrieves 4 byte unsigned integer stored in |data| in network byte
+ * order and returns it in host byte order.
+ */
+uint32_t nghttp2_get_uint32(const uint8_t *data);
+
+void nghttp2_downcase(uint8_t *s, size_t len);
+
+/*
+ * Adjusts |*local_window_size_ptr|, |*recv_window_size_ptr|,
+ * |*recv_reduction_ptr| with |*delta_ptr| which is the
+ * WINDOW_UPDATE's window_size_increment sent from local side. If
+ * |delta| is strictly larger than |*recv_window_size_ptr|,
+ * |*local_window_size_ptr| is increased by delta -
+ * *recv_window_size_ptr. If |delta| is negative,
+ * |*local_window_size_ptr| is decreased by delta.
+ *
+ * This function returns 0 if it succeeds, or one of the following
+ * negative error codes:
+ *
+ * NGHTTP2_ERR_FLOW_CONTROL
+ *     local_window_size overflow or gets negative.
+ */
+int nghttp2_adjust_local_window_size(int32_t *local_window_size_ptr,
+                                     int32_t *recv_window_size_ptr,
+                                     int32_t *recv_reduction_ptr,
+                                     int32_t *delta_ptr);
+
+/*
+ * This function works like nghttp2_adjust_local_window_size().  The
+ * difference is that this function assumes *delta_ptr >= 0, and
+ * *recv_window_size_ptr is not decreased by *delta_ptr.
+ *
+ * This function returns 0 if it succeeds, or one of the following
+ * negative error codes:
+ *
+ * NGHTTP2_ERR_FLOW_CONTROL
+ *     local_window_size overflow or gets negative.
+ */
+int nghttp2_increase_local_window_size(int32_t *local_window_size_ptr,
+                                       int32_t *recv_window_size_ptr,
+                                       int32_t *recv_reduction_ptr,
+                                       int32_t *delta_ptr);
+
+/*
+ * Returns non-zero if the function decided that WINDOW_UPDATE should
+ * be sent.
+ */
+int nghttp2_should_send_window_update(int32_t local_window_size,
+                                      int32_t recv_window_size);
+
+/*
+ * Copies the buffer |src| of length |len| to the destination pointed
+ * by the |dest|, assuming that the |dest| is at lest |len| bytes long
+ * . Returns dest + len.
+ */
+uint8_t *nghttp2_cpymem(uint8_t *dest, const void *src, size_t len);
+
+#endif /* NGHTTP2_HELPER_H */