encode 在C++中的用法
最新回答
人不喂鸡天猪地灭
2026-10-22 17:36:55
说明：encode是用来对url中特殊字符进行编码的。
入参：需要进行编码的字符bytes_to_encode ，字符的长度in_len。
std::string encode(unsigned char const* bytes_to_encode, unsigned int in_len) {
std::string ret;
int i = 0;
int j = 0;
unsigned char char_array_3[3];
unsigned char char_array_4[4];
//依次循环处理byte位数，并做移位运算。
while (in_len--) {
char_array_3[i++] = *(bytes_to_encode++);
if (i == 3) {
char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
char_array_4[3] = char_array_3[2] & 0x3f;
for(i = 0; (i <4) ; i++)
ret += base64_chars[char_array_4[i]];
i = 0;
}
}
if (i)
{
for(j = i; j < 3; j++)
char_array_3[j] = '\0';
char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
char_array_4[3] = char_array_3[2] & 0x3f;
for (j = 0; (j < i + 1); j++)
ret += base64_chars[char_array_4[j]];
while((i++ < 3))
ret += '=';
}
//返回结果
return ret;
}
快乐
2026-06-08 12:52:04
std::string UrlEncode(const std::string& szToEncode)
{
std::string src = szToEncode;
char hex[] = "0123456789ABCDEF";
string dst;
for (size_t i = 0; i < src.size(); ++i)
{
unsigned char cc = src[i];
if (isascii(cc))
{
if (cc == ' ')
{
dst += "%20";
}
else
dst += cc;
}
else
{
unsigned char c = static_cast<unsigned char>(src
[i]);
dst += '%';
dst += hex[c / 16];
dst += hex[c % 16];
}
}
return dst;
}
std::string UrlDecode(const std::string& szToDecode)
{
std::string result;
int hex = 0;
for (size_t i = 0; i < szToDecode.length(); ++i)
{
switch (szToDecode[i])
{
case '+':
result += ' ';
break;
case '%':
if (isxdigit(szToDecode[i + 1]) && isxdigit
(szToDecode[i + 2]))
{
std::string hexStr = szToDecode.substr(i + 1,
2);
hex = strtol(hexStr.c_str(), 0, 16);
//字母和数字[0-9a-zA-Z]、一些特殊符号[$-_.+!
*'(),] 、以及某些保留字[$&+,/:;=?@]
//可以不经过编码直接用于URL
if (!((hex >= 48 && hex <= 57) || //0-9
(hex >=97 && hex <= 122) || //a-z
(hex >=65 && hex <= 90) || //A-Z
//一些特殊符号及保留字[$-_.+!*'(),] [$&
+,/:;=?@]
hex == 0x21 || hex == 0x24 || hex == 0x26
|| hex == 0x27 || hex == 0x28 || hex == 0x29
|| hex == 0x2a || hex == 0x2b|| hex == 0x2c
|| hex == 0x2d || hex == 0x2e || hex == 0x2f
|| hex == 0x3A || hex == 0x3B|| hex == 0x3D
|| hex == 0x3f || hex == 0x40 || hex == 0x5f
))
{
result += char(hex);
i += 2;
}
else result += '%';
}else {
result += '%';
}
break;
default:
result += szToDecode[i];
break;
}
}
return result;
}
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