十六进制字符串

// Copyright (c) 
// All rights reserved.
//
//Describe : Hex string
//Author   : Qing
//Date     : 2014-08-14

#ifndef __HEX_STRING_H__
#define __HEX_STRING_H__

#include <string>

namespace Qing
{
    class HexString
    {
    public:

        HexString(void);
        ~HexString(void);

        int HexCharToInt(char ch) const;
        std::string AddSpace(const std::string &SourcesString, int Interval) const;

        void HexToString(const unsigned char* HexCharArray, int ArraySize, unsigned char* TargetBuffer, int BufferSize) const;
        void StringToHex(std::string &MyString, const unsigned char* SourcesCharArray, int ArraySize, bool IsLowerCase) const;
    };
}

#endif

#include "StdAfx.h"
#include "HexString.h"

namespace Qing
{
    HexString::HexString(void)
    {
    }

    HexString::~HexString(void)
    {
    }

    int HexString::HexCharToInt(char Ch) const
    {
        if(Ch >= '0' && Ch <= '9') return (Ch - '0');
        if(Ch >= 'A' && Ch <= 'F') return (Ch - 'A' + 10);
        if(Ch >= 'a' && Ch <= 'f') return (Ch - 'a' + 10);

        return 0;
    }

    std::string HexString::AddSpace(const std::string &SourcesString, int Interval) const
    {
        std::string Space(" ");
        std::string TempString = SourcesString;

        for(std::string::size_type Index = Interval; Index < TempString.size(); Index += Interval)
        {
            TempString.insert(Index, Space);
            ++Index;
        }

        return TempString;
    }

    void HexString::HexToString(const unsigned char* HexCharArray, int ArraySize, unsigned char* TargetBuffer, int BufferSize) const
    {
        memset(TargetBuffer, 0, BufferSize);

        for(int Index = 0; Index < ArraySize; Index+=2)
        {
            TargetBuffer[Index/2] = static_cast<char>(((HexCharToInt(HexCharArray[Index]) << 4) | HexCharToInt(HexCharArray[Index+1])));
        }
    }

    void HexString::StringToHex(std::string &MyString, const unsigned char* SourcesCharArray, int ArraySize, bool IsLowerCase) const
    {
        MyString.clear();
        std::string FlagString(IsLowerCase ? "0123456789abcdef" : "0123456789ABCDEF");

        int b = 0;
        for(int i = 0; i < ArraySize; i++)
        {
            b = 0x0f & (SourcesCharArray[i] >> 4);
            MyString.append(1, FlagString.at(b));

            b = 0x0f & SourcesCharArray[i];
            MyString.append(1, FlagString.at(b));
        }
    }
}