岡本 陸 / splitData

test

splitData.cpp@0:44e295c34728, 2019-02-15 (annotated)

Committer:
yuto17320508
Date:
Fri Feb 15 09:57:11 2019 +0000
Revision:
0:44e295c34728
bit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
yuto17320508 0:44e295c34728 1 /*intの数をchar型の欲しいbyte数に変換*/
yuto17320508 0:44e295c34728 2 #include "splitData.h"
yuto17320508 0:44e295c34728 3 #include <cstdlib>
yuto17320508 0:44e295c34728 4 #include "math.h"
yuto17320508 0:44e295c34728 5
yuto17320508 0:44e295c34728 6
yuto17320508 0:44e295c34728 7 //////////////Intobyte内の関数
yuto17320508 0:44e295c34728 8 void limitDataForByte(int data,int byte);//指定のbyteで送れる量に制限.
yuto17320508 0:44e295c34728 9 void SplitToAbsData(int wannaChange,int byte,char *candata,int firstElement);//絶対値をcharに分解
yuto17320508 0:44e295c34728 10 void PutSignInTheLeft(int wannaChange,int byte,char *candata,int firstElement);
yuto17320508 0:44e295c34728 11 int Intsign(int num);//int型の数の符号を返す関数。正なら1,負なら-1
yuto17320508 0:44e295c34728 12
yuto17320508 0:44e295c34728 13
yuto17320508 0:44e295c34728 14 void Intobyte(int wannaChange,int byte,char *candata,int firstElement)//指定されたbyte数のchar型に分解.一番左に符号
yuto17320508 0:44e295c34728 15 {
yuto17320508 0:44e295c34728 16 limitDataForByte(wannaChange, byte);
yuto17320508 0:44e295c34728 17 SplitToAbsData(wannaChange,byte,candata,firstElement);
yuto17320508 0:44e295c34728 18 PutSignInTheLeft(wannaChange,byte,candata,firstElement);
yuto17320508 0:44e295c34728 19 }
yuto17320508 0:44e295c34728 20
yuto17320508 0:44e295c34728 21
yuto17320508 0:44e295c34728 22 void limitDataForByte(int data,int byte)//指定のbyteで送れる量に制限.
yuto17320508 0:44e295c34728 23 {
yuto17320508 0:44e295c34728 24 int limit=1<<(8*byte-1); //一番左に1
yuto17320508 0:44e295c34728 25 if( abs(data) >= limit) {
yuto17320508 0:44e295c34728 26 data=Intsign(data)*(limit-1);
yuto17320508 0:44e295c34728 27 }
yuto17320508 0:44e295c34728 28
yuto17320508 0:44e295c34728 29 }
yuto17320508 0:44e295c34728 30
yuto17320508 0:44e295c34728 31 //絶対値をcharに分解
yuto17320508 0:44e295c34728 32 void SplitToAbsData(int wannaChange,int byte,char *candata,int firstElement)
yuto17320508 0:44e295c34728 33 {
yuto17320508 0:44e295c34728 34 int absdata = abs(wannaChange);
yuto17320508 0:44e295c34728 35 for(int i=0; i<byte; i++)
yuto17320508 0:44e295c34728 36 candata[i+firstElement]=(absdata>>8*i)&255;
yuto17320508 0:44e295c34728 37 }
yuto17320508 0:44e295c34728 38 void PutSignInTheLeft(int wannaChange,int byte,char *candata,int firstElement)
yuto17320508 0:44e295c34728 39 {
yuto17320508 0:44e295c34728 40 if(wannaChange<0) {
yuto17320508 0:44e295c34728 41 int lastElement=firstElement+byte-1;
yuto17320508 0:44e295c34728 42 candata[lastElement]+=128;
yuto17320508 0:44e295c34728 43 }
yuto17320508 0:44e295c34728 44 }
yuto17320508 0:44e295c34728 45 int Intsign(int num)//int型の数の符号を返す関数。正なら1,負なら-1
yuto17320508 0:44e295c34728 46 {
yuto17320508 0:44e295c34728 47 return (num>0)-(num<0); //num>0の時(num>0)=1,num<=0で(num>0)=0であることを利用。
yuto17320508 0:44e295c34728 48 }