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string_conversion.cpp
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string_conversion.cpp
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#include "string_conversion.h"
#include <limits.h>
using namespace std;
size_t str_to_uint32_t(const string &m_str)
{
size_t ret = 0;
size_t power = 1;
if( (m_str.size() > 2) && (m_str[0] == '0') && ( toupper(m_str[1]) == 'X') ){
const string tmp = m_str.substr(2, m_str.size() - 2);
// Read as a hexadecimal number
for(string::const_reverse_iterator i = tmp.rbegin();i != tmp.rend();++i){
switch(*i){
case '0':
break;
case '1':
ret += power;
break;
case '2':
ret += power*2;
break;
case '3':
ret += power*3;
break;
case '4':
ret += power*4;
break;
case '5':
ret += power*5;
break;
case '6':
ret += power*6;
break;
case '7':
ret += power*7;
break;
case '8':
ret += power*8;
break;
case '9':
ret += power*9;
break;
case 'A': case 'a':
ret += power*10;
break;
case 'B': case 'b':
ret += power*11;
break;
case 'C': case 'c':
ret += power*12;
break;
case 'D': case 'd':
ret += power*13;
break;
case 'E': case 'e':
ret += power*14;
break;
case 'F': case 'f':
ret += power*15;
break;
default:
throw __FILE__ ":str_to_uint32_t: Illegal character in hex form";
};
power *= 16;
}
}
else{ // Parse as a decimal number
for(string::const_reverse_iterator i = m_str.rbegin();i != m_str.rend();++i){
if( (*i < '0') || (*i > '9') ){
throw __FILE__ ":str_to_uint32_t: Illegal character in decimal form";
}
ret += power*(*i - '0');
power *= 10;
}
}
if(ret > UINT_MAX){
throw __FILE__ ":str_to_uint32_t: Overflow!";
}
return uint32_t(ret);
}
size_t str_to_size_t(const string &m_str)
{
size_t ret = 0;
size_t power = 1;
if( (m_str.size() > 2) && (m_str[0] == '0') && ( toupper(m_str[1]) == 'X') ){
const string tmp = m_str.substr(2, m_str.size() - 2);
// Read as a hexadecimal number
for(string::const_reverse_iterator i = tmp.rbegin();i != tmp.rend();++i){
switch(*i){
case '0':
break;
case '1':
ret += power;
break;
case '2':
ret += power*2;
break;
case '3':
ret += power*3;
break;
case '4':
ret += power*4;
break;
case '5':
ret += power*5;
break;
case '6':
ret += power*6;
break;
case '7':
ret += power*7;
break;
case '8':
ret += power*8;
break;
case '9':
ret += power*9;
break;
case 'A': case 'a':
ret += power*10;
break;
case 'B': case 'b':
ret += power*11;
break;
case 'C': case 'c':
ret += power*12;
break;
case 'D': case 'd':
ret += power*13;
break;
case 'E': case 'e':
ret += power*14;
break;
case 'F': case 'f':
ret += power*15;
break;
default:
throw __FILE__ ":str_to_size_t: Illegal character in hex form";
};
power *= 16;
}
}
else{ // Parse as a decimal number
for(string::const_reverse_iterator i = m_str.rbegin();i != m_str.rend();++i){
if( (*i < '0') || (*i > '9') ){
throw __FILE__ ":str_to_size_t: Illegal character in decimal form";
}
ret += power*(*i - '0');
power *= 10;
}
}
return ret;
}