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123 lines
4.3 KiB
123 lines
4.3 KiB
4 years ago
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/*
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* nghttp2 - HTTP/2 C Library
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*
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* Copyright (c) 2012 Tatsuhiro Tsujikawa
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef NGHTTP2_HELPER_H
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#define NGHTTP2_HELPER_H
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif /* HAVE_CONFIG_H */
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#include <string.h>
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#include <stddef.h>
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#include <nghttp2/nghttp2.h>
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#include "nghttp2_mem.h"
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#define nghttp2_min(A, B) ((A) < (B) ? (A) : (B))
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#define nghttp2_max(A, B) ((A) > (B) ? (A) : (B))
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#define lstreq(A, B, N) ((sizeof((A)) - 1) == (N) && memcmp((A), (B), (N)) == 0)
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#define nghttp2_struct_of(ptr, type, member) \
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((type *)(void *)((char *)(ptr)-offsetof(type, member)))
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/*
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* Copies 2 byte unsigned integer |n| in host byte order to |buf| in
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* network byte order.
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*/
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void nghttp2_put_uint16be(uint8_t *buf, uint16_t n);
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/*
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* Copies 4 byte unsigned integer |n| in host byte order to |buf| in
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* network byte order.
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*/
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void nghttp2_put_uint32be(uint8_t *buf, uint32_t n);
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/*
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* Retrieves 2 byte unsigned integer stored in |data| in network byte
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* order and returns it in host byte order.
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*/
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uint16_t nghttp2_get_uint16(const uint8_t *data);
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/*
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* Retrieves 4 byte unsigned integer stored in |data| in network byte
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* order and returns it in host byte order.
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*/
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uint32_t nghttp2_get_uint32(const uint8_t *data);
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void nghttp2_downcase(uint8_t *s, size_t len);
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/*
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* Adjusts |*local_window_size_ptr|, |*recv_window_size_ptr|,
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* |*recv_reduction_ptr| with |*delta_ptr| which is the
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* WINDOW_UPDATE's window_size_increment sent from local side. If
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* |delta| is strictly larger than |*recv_window_size_ptr|,
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* |*local_window_size_ptr| is increased by delta -
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* *recv_window_size_ptr. If |delta| is negative,
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* |*local_window_size_ptr| is decreased by delta.
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*
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* This function returns 0 if it succeeds, or one of the following
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* negative error codes:
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*
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* NGHTTP2_ERR_FLOW_CONTROL
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* local_window_size overflow or gets negative.
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*/
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int nghttp2_adjust_local_window_size(int32_t *local_window_size_ptr,
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int32_t *recv_window_size_ptr,
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int32_t *recv_reduction_ptr,
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int32_t *delta_ptr);
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/*
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* This function works like nghttp2_adjust_local_window_size(). The
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* difference is that this function assumes *delta_ptr >= 0, and
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* *recv_window_size_ptr is not decreased by *delta_ptr.
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*
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* This function returns 0 if it succeeds, or one of the following
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* negative error codes:
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*
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* NGHTTP2_ERR_FLOW_CONTROL
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* local_window_size overflow or gets negative.
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*/
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int nghttp2_increase_local_window_size(int32_t *local_window_size_ptr,
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int32_t *recv_window_size_ptr,
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int32_t *recv_reduction_ptr,
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int32_t *delta_ptr);
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/*
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* Returns non-zero if the function decided that WINDOW_UPDATE should
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* be sent.
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*/
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int nghttp2_should_send_window_update(int32_t local_window_size,
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int32_t recv_window_size);
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/*
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* Copies the buffer |src| of length |len| to the destination pointed
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* by the |dest|, assuming that the |dest| is at lest |len| bytes long
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* . Returns dest + len.
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*/
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uint8_t *nghttp2_cpymem(uint8_t *dest, const void *src, size_t len);
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#endif /* NGHTTP2_HELPER_H */
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