时间优先字符串压缩与解压缩

#include <stdio.h>
#include <stdlib.h>
#include<string.h>
#include<malloc.h>
#include <memory.h>

// 时间优先
char * timefastzip(char *str)
{
    int length = strlen(str);//获取长度
    char *newstr = calloc(length + 1, 1);//分配内存

    char *p = str;
    char *newp = newstr;//备份
    while (*p != '\0')
    {
        char *pis = p;//标识当前指针
        char ch = *pis;//当前字符
        int  strlength = 0;

        while ((*pis) == (*(pis + 1)))//如果相等
        {
            pis++;//指针移动
            strlength++;//计数
        }

        if (strlength == 0)
        {
            /*    
                *newp = *p;
                newp++;
                p++;
            */
            *newp++ = *p++;

        }
        else
        {
            *newp = strlength + 1 + '0';//转化为字符
            *(newp + 1) = *p;//保存字符
            newp += 2;
            p += strlength + 1;//指针往前移动
        }
    }

    length = strlen(newstr);//新的长度

    newstr = _recalloc(newstr, length + 1, 1);//压缩内存

    return newstr;
}

char * timefastunzip(char *str)
{
    char *newstr = calloc(10000, 1);//分配缓冲区
    char *p = str;
    char *newp = newstr;//备份
    while (*p != '\0')
    {
        char *pis = p;
        if (*pis >= '0' && *pis <= '9')
        {
            int length = *pis - '0';//长度
            for (int i = 0; i < length; i++)//拷贝字符
            {
                *newp++ = *(pis + 1);
            }
            p += 2;//指针下移动
        }
        else
        {
            *newp++ = *p++;//常规，直接拷贝
        }
    }

    int  length = strlen(newstr);//新的长度

    newstr = _recalloc(newstr, length + 1, 1);//压缩内存

    return newstr;

}
void main()
{
    char str[1024] = "aaaaabbhelloworldccccccccc";

    printf("压缩之前：%s\n", str);

    printf("压缩之后：%s\n", timefastzip(str));

    printf("解压缩之后：%s\n", timefastunzip(timefastzip(str)));

    system("pause");
}