#include "utils.h"
#include <string.h>

void base64_encode(const unsigned char *str, int str_len, unsigned char *res, int *res_len)
{
    long len;

    int i,j;
    //定义base64编码表
    unsigned char base64_table[128]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

    //计算经过base64编码后的字符串长度
    if(str_len % 3 == 0)
        len=str_len/3*4;
    else
        len=(str_len/3+1)*4;

    *res_len = len;
    res[len]='\0';

    //以3个8位字符为一组进行编码
    for(i=0,j=0;i<len-2;j+=3,i+=4)
    {
        res[i]=base64_table[str[j]>>2]; //取出第一个字符的前6位并找出对应的结果字符
        res[i+1]=base64_table[(str[j]&0x3)<<4 | (str[j+1]>>4)]; //将第一个字符的后位与第二个字符的前4位进行组合并找到对应的结果字符
        res[i+2]=base64_table[(str[j+1]&0xf)<<2 | (str[j+2]>>6)]; //将第二个字符的后4位与第三个字符的前2位组合并找出对应的结果字符
        res[i+3]=base64_table[str[j+2]&0x3f]; //取出第三个字符的后6位并找出结果字符
    }

    switch(str_len % 3)
    {
    case 1:
        res[i-2]='=';
        res[i-1]='=';
        break;
    case 2:
        res[i-1]='=';
        break;
    }
}

void base64_decode(const unsigned char *code, int code_len, unsigned char *res, int *res_len)
{
    //根据base64表，以字符找到对应的十进制数据
    int table[]={0,0,0,0,0,0,0,0,0,0,0,0,
        0,0,0,0,0,0,0,0,0,0,0,0,
        0,0,0,0,0,0,0,0,0,0,0,0,
        0,0,0,0,0,0,0,62,0,0,0,
        63,52,53,54,55,56,57,58,
        59,60,61,0,0,0,0,0,0,0,0,
        1,2,3,4,5,6,7,8,9,10,11,12,
        13,14,15,16,17,18,19,20,21,
        22,23,24,25,0,0,0,0,0,0,26,
        27,28,29,30,31,32,33,34,35,
        36,37,38,39,40,41,42,43,44,
        45,46,47,48,49,50,51
    };
    long len;
    long str_len;

    int i,j;

    //计算解码后的字符串长度
    len = code_len;
    //判断编码后的字符串后是否有=
    if(strstr((char*)code,"=="))
        str_len=len/4*3-2;
    else if(strstr((char*)code,"="))
        str_len=len/4*3-1;
    else
        str_len=len/4*3;

    res[str_len]='\0';
    *res_len = str_len;
    //以4个字符为一位进行解码
    for(i=0,j=0;i < len-2;j+=3,i+=4)
    {
        res[j]=((unsigned char)table[code[i]])<<2 | (((unsigned char)table[code[i+1]])>>4); //取出第一个字符对应base64表的十进制数的前6位与第二个字符对应base64表的十进制数的后2位进行组合
        res[j+1]=(((unsigned char)table[code[i+1]])<<4) | (((unsigned char)table[code[i+2]])>>2); //取出第二个字符对应base64表的十进制数的后4位与第三个字符对应bas464表的十进制数的后4位进行组合
        res[j+2]=(((unsigned char)table[code[i+2]])<<6) | ((unsigned char)table[code[i+3]]); //取出第三个字符对应base64表的十进制数的后2位与第4个字符进行组合
    }
}

QStringList extractParaList(const QString &msg)
{
    QStringList paraList;
    QString data = msg.simplified();
    if(data.startsWith("$") && data.contains("*")){
        data = data.left(data.indexOf("*"));
        data = data.right(data.size()-data.indexOf(",")-1);
        paraList = data.split(",");
    }
    return paraList;
}

double degreeSecond2degree(double degreeSecond)
{
    double degree = floor(degreeSecond/100);
    double second = degreeSecond - degree*100;
    double result = degree + second/60;
    return result;
}