仿Hexdump的代码

编码过程中我们有时候需要将数据的十六进制值打出来看看，这里做一下记录

#include <ctype.h>
#include <unistd.h>
#include <sstream>
#include <string>
#include <iomanip>

std::string pretty_string(uint8_t* ret,size_t size)
{
    if(size == 0)
    {
        return "";
    }
    std::stringstream out;
    for (size_t i = 0; i < size; i++)
    {
        size_t c = i;
        out << std::hex << std::setw(2*sizeof(size_t)) << std::setfill('0') << i << "  ";
        for (size_t j = 0; j < 8; j++, c++)
        {
            if (c < size)
            {
                // printf("%02X ", ret[c]);
                out << std::hex << std::setw(2) << std::setfill('0') << (int)ret[c] << " ";
            }
            else
            {
                out << "   ";
            }
        }
        out << " ";
        for (size_t j = 0; j < 8; j++, c++)
        {
            if (c < size)
            {
                out << std::hex << std::setw(2)  << std::setfill('0') << (int)ret[c] << " ";
            }
            else
            {
                out << "   ";
            }
        }
        c = i;
        out << "   |";
        size_t count = 0;
        for (size_t j = 0; j < 16 && c < size; j++, c++, count++)
        {
            if (isprint(ret[c]) && ret[c])
            {
                out << (char)ret[c];
            }
            else
            {
                out << ".";
            }
        }
        i = i + count - 1;
        out <<"|\n";
    }
    out << std::hex << std::setw(2*sizeof(size_t)) << std::setfill('0') << size << std::endl;
    return out.str();
}

void pretty_print(uint8_t* ret,size_t size)
{
    for (size_t i = 0; i < size; i++)
    {
        size_t c = i;
        printf("%0.*zx  ",(int)sizeof(size_t)*2,i);
        for (size_t j = 0; j < 8; j++, c++)
        {
            if (c < size)
            {
                printf("%02X ", ret[c]);
            }
            else
            {
                printf("   ");
            }
        }
        printf(" ");
        for (size_t j = 0; j < 8; j++, c++)
        {
            if (c < size)
            {
                printf("%02X ", ret[c]);
            }
            else
            {
                printf("   ");
            }
        }
        c = i;
        printf("   |");
        size_t count = 0;
        for (size_t j = 0; j < 16 && c < size; j++, c++, count++)
        {
            if (isprint(ret[c]) && ret[c])
            {
                printf("%c", ret[c]);
            }
            else
            {
                printf(".");
            }
        }
        i = i + count - 1;
        printf("|\n");
    }
    printf("%0.*zx\n",(int)sizeof(size_t)*2,size);
}