| /* |
| * 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 */ |