Timothy Beight / Mbed 2 deprecated 6_songs-from-the-cloud

This is a fork due to permission issues

Dependencies:   mbed Socket lwip-eth lwip-sys lwip

Fork of 6_songs-from-the-cloud by MakingMusicWorkshop

mbed-client/nanostack-libservice/source/libBits/common_functions.c@1:0ddbe2d3319c, 2016-05-19 (annotated)

Committer:
timbeight
Date:
Thu May 19 16:02:10 2016 +0000
Revision:
1:0ddbe2d3319c
Parent:
0:f7c60d3e7b8a 
This is my first commit while in the class.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
maclobdell 0:f7c60d3e7b8a 1 /*
maclobdell 0:f7c60d3e7b8a 2 * Copyright (c) 2014-2015 ARM Limited. All rights reserved.
maclobdell 0:f7c60d3e7b8a 3 * SPDX-License-Identifier: Apache-2.0
maclobdell 0:f7c60d3e7b8a 4 * Licensed under the Apache License, Version 2.0 (the License); you may
maclobdell 0:f7c60d3e7b8a 5 * not use this file except in compliance with the License.
maclobdell 0:f7c60d3e7b8a 6 * You may obtain a copy of the License at
maclobdell 0:f7c60d3e7b8a 7 *
maclobdell 0:f7c60d3e7b8a 8 * http://www.apache.org/licenses/LICENSE-2.0
maclobdell 0:f7c60d3e7b8a 9 *
maclobdell 0:f7c60d3e7b8a 10 * Unless required by applicable law or agreed to in writing, software
maclobdell 0:f7c60d3e7b8a 11 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
maclobdell 0:f7c60d3e7b8a 12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
maclobdell 0:f7c60d3e7b8a 13 * See the License for the specific language governing permissions and
maclobdell 0:f7c60d3e7b8a 14 * limitations under the License.
maclobdell 0:f7c60d3e7b8a 15 */
maclobdell 0:f7c60d3e7b8a 16
maclobdell 0:f7c60d3e7b8a 17 /*
maclobdell 0:f7c60d3e7b8a 18 * Most functions can be inlined, and definitions are in common_functions.h.
maclobdell 0:f7c60d3e7b8a 19 * Define COMMON_FUNCTIONS_FN before including it to generate external definitions.
maclobdell 0:f7c60d3e7b8a 20 */
maclobdell 0:f7c60d3e7b8a 21 #define COMMON_FUNCTIONS_FN extern
maclobdell 0:f7c60d3e7b8a 22
maclobdell 0:f7c60d3e7b8a 23 #include "common_functions.h"
maclobdell 0:f7c60d3e7b8a 24
maclobdell 0:f7c60d3e7b8a 25 #include <string.h>
maclobdell 0:f7c60d3e7b8a 26
maclobdell 0:f7c60d3e7b8a 27 /* Returns mask for <split_value> (0-8) most-significant bits of a byte */
maclobdell 0:f7c60d3e7b8a 28 static inline uint8_t context_split_mask(uint_fast8_t split_value)
maclobdell 0:f7c60d3e7b8a 29 {
maclobdell 0:f7c60d3e7b8a 30 return (uint8_t) - (0x100u >> split_value);
maclobdell 0:f7c60d3e7b8a 31 }
maclobdell 0:f7c60d3e7b8a 32
maclobdell 0:f7c60d3e7b8a 33 bool bitsequal(const uint8_t *a, const uint8_t *b, uint_fast8_t bits)
maclobdell 0:f7c60d3e7b8a 34 {
maclobdell 0:f7c60d3e7b8a 35 uint_fast8_t bytes = bits / 8;
maclobdell 0:f7c60d3e7b8a 36 bits %= 8;
maclobdell 0:f7c60d3e7b8a 37
maclobdell 0:f7c60d3e7b8a 38 if (memcmp(a, b, bytes)) {
maclobdell 0:f7c60d3e7b8a 39 return false;
maclobdell 0:f7c60d3e7b8a 40 }
maclobdell 0:f7c60d3e7b8a 41
maclobdell 0:f7c60d3e7b8a 42 if (bits) {
maclobdell 0:f7c60d3e7b8a 43 uint_fast8_t split_bit = context_split_mask(bits);
maclobdell 0:f7c60d3e7b8a 44 if ((a[bytes] & split_bit) != (b[bytes] & split_bit)) {
maclobdell 0:f7c60d3e7b8a 45 return false;
maclobdell 0:f7c60d3e7b8a 46 }
maclobdell 0:f7c60d3e7b8a 47 }
maclobdell 0:f7c60d3e7b8a 48
maclobdell 0:f7c60d3e7b8a 49 return true;
maclobdell 0:f7c60d3e7b8a 50 }
maclobdell 0:f7c60d3e7b8a 51
maclobdell 0:f7c60d3e7b8a 52 uint8_t *bitcopy(uint8_t *restrict dst, const uint8_t *restrict src, uint_fast8_t bits)
maclobdell 0:f7c60d3e7b8a 53 {
maclobdell 0:f7c60d3e7b8a 54 uint_fast8_t bytes = bits / 8;
maclobdell 0:f7c60d3e7b8a 55 bits %= 8;
maclobdell 0:f7c60d3e7b8a 56
maclobdell 0:f7c60d3e7b8a 57 if (bytes) {
maclobdell 0:f7c60d3e7b8a 58 dst = (uint8_t *) memcpy(dst, src, bytes) + bytes;
maclobdell 0:f7c60d3e7b8a 59 src += bytes;
maclobdell 0:f7c60d3e7b8a 60 }
maclobdell 0:f7c60d3e7b8a 61
maclobdell 0:f7c60d3e7b8a 62 if (bits) {
maclobdell 0:f7c60d3e7b8a 63 uint_fast8_t split_bit = context_split_mask(bits);
maclobdell 0:f7c60d3e7b8a 64 *dst = (*src & split_bit) | (*dst & ~ split_bit);
maclobdell 0:f7c60d3e7b8a 65 }
maclobdell 0:f7c60d3e7b8a 66
maclobdell 0:f7c60d3e7b8a 67 return dst;
maclobdell 0:f7c60d3e7b8a 68 }
maclobdell 0:f7c60d3e7b8a 69
maclobdell 0:f7c60d3e7b8a 70 uint8_t *bitcopy0(uint8_t *restrict dst, const uint8_t *restrict src, uint_fast8_t bits)
maclobdell 0:f7c60d3e7b8a 71 {
maclobdell 0:f7c60d3e7b8a 72 uint_fast8_t bytes = bits / 8;
maclobdell 0:f7c60d3e7b8a 73 bits %= 8;
maclobdell 0:f7c60d3e7b8a 74
maclobdell 0:f7c60d3e7b8a 75 if (bytes) {
maclobdell 0:f7c60d3e7b8a 76 dst = (uint8_t *) memcpy(dst, src, bytes) + bytes;
maclobdell 0:f7c60d3e7b8a 77 src += bytes;
maclobdell 0:f7c60d3e7b8a 78 }
maclobdell 0:f7c60d3e7b8a 79
maclobdell 0:f7c60d3e7b8a 80 if (bits) {
maclobdell 0:f7c60d3e7b8a 81 uint_fast8_t split_bit = context_split_mask(bits);
maclobdell 0:f7c60d3e7b8a 82 *dst = (*src & split_bit);
maclobdell 0:f7c60d3e7b8a 83 }
maclobdell 0:f7c60d3e7b8a 84
maclobdell 0:f7c60d3e7b8a 85 return dst;
maclobdell 0:f7c60d3e7b8a 86 }