varint - int32數據編碼解碼C程序實現

#include <stdio.h>

/************************************************

*說明：下面代碼沒有糾錯部分。

*請自行添加。

*******************************************************/

int Variant_Encode()
{

          unsigned char data[5]={0} ;
          int count = 0;
          int value=300;
          do
          {
              data[count] = (unsigned char )((value & 0x7F) | 0x80);
              count++;
          } while ((value >>= 7) != 0);
          data[count - 1] &= 0x7F;
        printf("data=%x,%x,%x,%x,%x\n",data[0],data[1],data[2],data[3],data[4]);

        return 0;

}

/*************************************華麗的分割線************************************/
unsigned int Variant_Decode ( )
{
        unsigned char data[5]={ 0xac,0x02,0x00,0x00,0x00 };
        unsigned int value = data[0];
        if ((value & 0x80) == 0) return value;
        value &= 0x7F;
        unsigned int chunk = data[1];
        value |= (chunk & 0x7F) << 7;
        if ((chunk & 0x80) == 0) return value;
        chunk = data[2];
        value |= (chunk & 0x7F) << 14;
        if ((chunk & 0x80) == 0) return value;
        chunk = data[3];
        value |= (chunk & 0x7F) << 21;
        if ((chunk & 0x80) == 0) return value;
        chunk = data[4]; ;
        value |= chunk << 28;
        if ((chunk & 0xF0) == 0) return value;

}