[英]convert decimal array(str) to binary array(bytes)
Please provide some code for converting char[] array of decimal values to bytes array for big integer value in c. 请提供一些代码,将c的大整数值的十进制值的char []数组转换为bytes数组。
How can I convert this below code for big array of decimal value, such as I get the result as array of long bytes? 如何将下面的代码转换为大的十进制值数组,例如将结果作为长字节数组获取?
static int dec2bin (char inbuf[], int num_convert)
{
char ctemp;
int result, power;
num_convert--; /* index of LS char to convert */
result = 0;
power = 1;
while (num_convert >= 0)
{
ctemp = inbuf[num_convert--]; /* working digit */
if (isdigit(ctemp))
{
result += ((ctemp-'0') * power);
power *= 10;
}
else
return(0); /* error: non-numeric digit detected */
}
return (result);
}
No it is not just long value , it is really a biginteger value , can anyone give a simple dec to byte(binary conversion logic , i will replace the int with my bigint implementations and bigint operators(add, mult) etc., 不,它不仅仅是long值,它实际上是biginteger值,任何人都可以将dec转换为字节(二进制转换逻辑,我将用我的bigint实现和bigint运算符(add,mult)等替换int,
Samuel is correct! 塞缪尔是对的!
Thanks in advance. 提前致谢。
For Example i can replace the above as below 例如我可以替换以下内容
static int dec2bin (char inbuf[], bigint num_convert)
{
char ctemp;
bigint result, power;
num_convert--; /* index of LS char to convert */
result = 0;
power = 1;
while (num_convert >= 0)
{
ctemp = inbuf[num_convert--]; /* working digit */
if (isdigit(ctemp))
{
result = bi_add(result ,(bi_mult((ctemp-'0'), power));
power = bi_mult(power , 10);
}
else
return(0); /* error: non-numeric digit detected */
}
return (result);
}
something like this will work ? 这样的事情会起作用吗?
It sounds like you are looking for a solution where you do the low level arithmetic yourself. 听起来您正在寻找自己进行底层算术的解决方案。
Have you considered using an existing bignum package such as the GNU Multi Precision Arithmetic library ? 您是否考虑过使用现有的bignum软件包,例如GNU Multi Precision Arithmetic库 ? It's pretty easy to convert your existing code once you have that. 拥有现有代码后,转换它非常容易。 For example, this code: 例如,此代码:
result += ((ctemp-'0') * power);
power *= 10;
becomes: 变成:
mpz_t tmp;
mpz_init(tmp);
mpz_mul_ui(tmp, power, ctemp - '0');
mpz_add(result, result, tmp);
mpz_clear(tmp);
mpz_mul_ui(power, power, 10);
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