基于 POCO 框架的 C++ 版搜狗代理程序

搜狗代理服务器程序，网上已经有用 Python 实现的版本。这个版本在某些情况下（例如迅雷下载）性能不够好，于是我用 C++ 实现了一个版本，基于 POCO 框架开发，应当具有不错的可移植性（改一下 _snprintf 函数名）。完整的源代码如下：
[Cpp]
#include <stdio.h>
#include <time.h>
#include <vector>
#include <string>
#include <Poco/ErrorHandler.h>
#include <Poco/Net/Socket.h>
#include <Poco/Net/HTTPServer.h>
#include <Poco/Net/HTTPServerRequest.h>
#include <Poco/Net/HTTPServerRequestImpl.h>
#include <Poco/Net/HTTPServerResponse.h>
#include <Poco/Net/HTTPRequestHandler.h>
#include <Poco/Net/HTTPClientSession.h>

using namespace std;
using namespace Poco;
using namespace Poco::Net;

class EH : public ErrorHandler
{
    virtual void exception(const Exception& exc)
    {
        printf("%s: %s\n", exc.what(), exc.message().c_str());
    }

    virtual void exception(const std::exception& exc)
    {
        printf("%s\n", exc.what());
    }

    virtual void exception()
    {
        printf("Unknown exception\n");
    }
};

const int BUFFER_SIZE = 65536;

class ProxyService : public HTTPRequestHandler
{
    HTTPClientSession client;

    static unsigned int hashTag(const string &s)
    {
        unsigned int code = s.length();
        for (int i = 0; i < s.length() / 4; ++i)
        {
            unsigned int a = (s[i * 4] & 0xffu) + ((s[i * 4 + 1] & 0xffu) << 8);
            unsigned int b = (s[i * 4 + 2] & 0xffu) + ((s[i * 4 + 3] & 0xffu) << 8);
            code += a;
            code ^= ((code << 5) ^ b) << 0xb;
            code += code >> 0xb;
        }
        switch (s.length() % 4)
        {
        case 1:
            code += s[s.length() - 1] & 0xffu;
            code ^= code << 0xa;
            code += code >> 1;
            break;
        case 2:
            code += (s[s.length() - 2] & 0xffu) + ((s[s.length() - 1] & 0xffu) << 8);
            code ^= code << 0xb;
            code += code >> 0x11;
            break;
        case 3:
            code += (s[s.length() - 3] & 0xffu) + ((s[s.length() - 2] & 0xffu) << 8);
            code ^= (code ^ ((s[s.length() - 1] & 0xffu) << 2)) << 0x10;
            code += code >> 0xb;
            break;
        }
        code ^= code << 3;
        code += code >> 5;
        code ^= code << 4;
        code += code >> 0x11;
        code ^= code << 0x19;
        code += code >> 6;
        return code;
    }

    static string hexString(unsigned int x)
    {
        char buff[20];
        _snprintf(buff, 16, "%08x", x);
        return string(buff, buff + 8);
    }

    void write(istream &in, ostream &out)
    {
        char buffer[BUFFER_SIZE];
        streamsize sz;
        while (in.good() && out.good())
        {
            in.read(buffer, sizeof(buffer));
            sz = in.gcount();
            if (sz <= 0)
                break;
            if (out.good())
                out.write(buffer, sz);
        }
    }

public:
    ProxyService()
    {
        static char xid = '0';
        char host[] = "h0.edu.bj.ie.sogou.com";
        char id = xid + 1;
        if (id > '9')
            id = '0';
        host[1] = id;
        xid = id;
        client.setHost(host);
        client.setPort(80);
    }

    virtual void handleRequest(HTTPServerRequest& request, HTTPServerResponse& response)

补充：软件开发 , C++ ,