Austin Blackstone / Mbed 2 deprecated mbed-client-classic-example-lwip

mbed client on ethernet with LWIP

Dependencies:   mbed Socket lwip-eth lwip-sys lwip

Fork of mbed-client-classic-example-lwip by sandbox

nanostack-libservice/source/libBits/common_functions.c@11:cada08fc8a70, 2016-06-09 (annotated)

Committer:
mbedAustin
Date:
Thu Jun 09 17:08:36 2016 +0000
Revision:
11:cada08fc8a70
Commit for public Consumption

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbedAustin 11:cada08fc8a70 1 /*
mbedAustin 11:cada08fc8a70 2 * Copyright (c) 2014-2015 ARM Limited. All rights reserved.
mbedAustin 11:cada08fc8a70 3 * SPDX-License-Identifier: Apache-2.0
mbedAustin 11:cada08fc8a70 4 * Licensed under the Apache License, Version 2.0 (the License); you may
mbedAustin 11:cada08fc8a70 5 * not use this file except in compliance with the License.
mbedAustin 11:cada08fc8a70 6 * You may obtain a copy of the License at
mbedAustin 11:cada08fc8a70 7 *
mbedAustin 11:cada08fc8a70 8 * http://www.apache.org/licenses/LICENSE-2.0
mbedAustin 11:cada08fc8a70 9 *
mbedAustin 11:cada08fc8a70 10 * Unless required by applicable law or agreed to in writing, software
mbedAustin 11:cada08fc8a70 11 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
mbedAustin 11:cada08fc8a70 12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbedAustin 11:cada08fc8a70 13 * See the License for the specific language governing permissions and
mbedAustin 11:cada08fc8a70 14 * limitations under the License.
mbedAustin 11:cada08fc8a70 15 */
mbedAustin 11:cada08fc8a70 16
mbedAustin 11:cada08fc8a70 17 /*
mbedAustin 11:cada08fc8a70 18 * Most functions can be inlined, and definitions are in common_functions.h.
mbedAustin 11:cada08fc8a70 19 * Define COMMON_FUNCTIONS_FN before including it to generate external definitions.
mbedAustin 11:cada08fc8a70 20 */
mbedAustin 11:cada08fc8a70 21 #define COMMON_FUNCTIONS_FN extern
mbedAustin 11:cada08fc8a70 22
mbedAustin 11:cada08fc8a70 23 #include "common_functions.h"
mbedAustin 11:cada08fc8a70 24
mbedAustin 11:cada08fc8a70 25 #include <string.h>
mbedAustin 11:cada08fc8a70 26
mbedAustin 11:cada08fc8a70 27 /* Returns mask for <split_value> (0-8) most-significant bits of a byte */
mbedAustin 11:cada08fc8a70 28 static inline uint8_t context_split_mask(uint_fast8_t split_value)
mbedAustin 11:cada08fc8a70 29 {
mbedAustin 11:cada08fc8a70 30 return (uint8_t) - (0x100u >> split_value);
mbedAustin 11:cada08fc8a70 31 }
mbedAustin 11:cada08fc8a70 32
mbedAustin 11:cada08fc8a70 33 bool bitsequal(const uint8_t *a, const uint8_t *b, uint_fast8_t bits)
mbedAustin 11:cada08fc8a70 34 {
mbedAustin 11:cada08fc8a70 35 uint_fast8_t bytes = bits / 8;
mbedAustin 11:cada08fc8a70 36 bits %= 8;
mbedAustin 11:cada08fc8a70 37
mbedAustin 11:cada08fc8a70 38 if (memcmp(a, b, bytes)) {
mbedAustin 11:cada08fc8a70 39 return false;
mbedAustin 11:cada08fc8a70 40 }
mbedAustin 11:cada08fc8a70 41
mbedAustin 11:cada08fc8a70 42 if (bits) {
mbedAustin 11:cada08fc8a70 43 uint_fast8_t split_bit = context_split_mask(bits);
mbedAustin 11:cada08fc8a70 44 if ((a[bytes] & split_bit) != (b[bytes] & split_bit)) {
mbedAustin 11:cada08fc8a70 45 return false;
mbedAustin 11:cada08fc8a70 46 }
mbedAustin 11:cada08fc8a70 47 }
mbedAustin 11:cada08fc8a70 48
mbedAustin 11:cada08fc8a70 49 return true;
mbedAustin 11:cada08fc8a70 50 }
mbedAustin 11:cada08fc8a70 51
mbedAustin 11:cada08fc8a70 52 uint8_t *bitcopy(uint8_t *restrict dst, const uint8_t *restrict src, uint_fast8_t bits)
mbedAustin 11:cada08fc8a70 53 {
mbedAustin 11:cada08fc8a70 54 uint_fast8_t bytes = bits / 8;
mbedAustin 11:cada08fc8a70 55 bits %= 8;
mbedAustin 11:cada08fc8a70 56
mbedAustin 11:cada08fc8a70 57 if (bytes) {
mbedAustin 11:cada08fc8a70 58 dst = (uint8_t *) memcpy(dst, src, bytes) + bytes;
mbedAustin 11:cada08fc8a70 59 src += bytes;
mbedAustin 11:cada08fc8a70 60 }
mbedAustin 11:cada08fc8a70 61
mbedAustin 11:cada08fc8a70 62 if (bits) {
mbedAustin 11:cada08fc8a70 63 uint_fast8_t split_bit = context_split_mask(bits);
mbedAustin 11:cada08fc8a70 64 *dst = (*src & split_bit) | (*dst & ~ split_bit);
mbedAustin 11:cada08fc8a70 65 }
mbedAustin 11:cada08fc8a70 66
mbedAustin 11:cada08fc8a70 67 return dst;
mbedAustin 11:cada08fc8a70 68 }
mbedAustin 11:cada08fc8a70 69
mbedAustin 11:cada08fc8a70 70 uint8_t *bitcopy0(uint8_t *restrict dst, const uint8_t *restrict src, uint_fast8_t bits)
mbedAustin 11:cada08fc8a70 71 {
mbedAustin 11:cada08fc8a70 72 uint_fast8_t bytes = bits / 8;
mbedAustin 11:cada08fc8a70 73 bits %= 8;
mbedAustin 11:cada08fc8a70 74
mbedAustin 11:cada08fc8a70 75 if (bytes) {
mbedAustin 11:cada08fc8a70 76 dst = (uint8_t *) memcpy(dst, src, bytes) + bytes;
mbedAustin 11:cada08fc8a70 77 src += bytes;
mbedAustin 11:cada08fc8a70 78 }
mbedAustin 11:cada08fc8a70 79
mbedAustin 11:cada08fc8a70 80 if (bits) {
mbedAustin 11:cada08fc8a70 81 uint_fast8_t split_bit = context_split_mask(bits);
mbedAustin 11:cada08fc8a70 82 *dst = (*src & split_bit);
mbedAustin 11:cada08fc8a70 83 }
mbedAustin 11:cada08fc8a70 84
mbedAustin 11:cada08fc8a70 85 return dst;
mbedAustin 11:cada08fc8a70 86 }