Akinori Hashimoto / CheckSum

Calculate checksum(hex) of string with ASCII(unsigned int). Use to detected communication error.

Dependencies:   StrLib

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Show/hide line numbers CheckSum.cpp Source File

CheckSum.cpp

00001 #include "CheckSum.h"
00002 
00003 
00004 string CheckSum::calc(string str, int Byte)
00005 {
00006     // calculate SUM.
00007     int sum= 0;
00008     int size= str.size();
00009 
00010     for(int idx= 0; idx < size; idx++)
00011         sum += str[idx];
00012 
00013     // convert HEX. REWRITE/REUSE.
00014     str= I2A(sum, 16, (Byte* 2)); // Hex, over 2chars(ex. 0x0f).
00015 
00016     // N[B] with the end of the hex checksum.
00017     size= str.size();
00018     if(size > (Byte* 2))        // cut tail from str.
00019         return str.substr(size- (Byte* 2));
00020 
00021     if(size == (Byte* 2))    // return 
00022         return str;
00023         
00024     // size < Byte
00025     return "ERR";
00026 }
00027 
00028 bool CheckSum::compare(string str, string sum)
00029 {
00030     int Byte= sum.size()/ 2;
00031     return strCompareComplete(CheckSum::calc(str, Byte), sum);
00032 }
00033 
00034 // EOF
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