add http_client library, using libcurl

take out common http entities to http_common dir

libs/main/http_client/pihttpclient.h

@@ -0,0 +1,61 @@
+#ifndef pihttpclient_h
+#define pihttpclient_h
+
+#include "pihttptypes.h"
+#include "pip_http_client_export.h"
+
+
+class PIHTTPClientBase {
+public:
+	int __infoFunc(ssize_t dltotal, ssize_t dlnow, ssize_t ultotal, ssize_t ulnow);
+	int __debugFunc(int type, char * data, size_t size);
+};
+
+
+class PIP_HTTP_CLIENT_EXPORT PIHTTPClient: private PIHTTPClientBase {
+	friend class PIHTTPClientBase;
+	friend class CurlThreadPool;
+
+public:
+	static PIHTTPClient * create(const PIString & url, PIHTTP::Method method = PIHTTP::Method::Get, const PIHTTP::MessageConst & req = {});
+
+	PIHTTPClient * onFinish(std::function<void()> f);
+	PIHTTPClient * onFinish(std::function<void(const PIHTTP::MessageConst &)> f);
+	PIHTTPClient * onError(std::function<void()> f);
+	PIHTTPClient * onError(std::function<void(const PIHTTP::MessageConst &)> f);
+	PIHTTPClient * onAbort(std::function<void()> f);
+	PIHTTPClient * onAbort(std::function<void(const PIHTTP::MessageConst &)> f);
+
+	void start();
+	void abort();
+
+	PIString lastError() const { return last_error; }
+
+private:
+	NO_COPY_CLASS(PIHTTPClient)
+	PIHTTPClient();
+	virtual ~PIHTTPClient();
+
+	PRIVATE_DECLARATION(PIP_HTTP_CLIENT_EXPORT)
+
+	bool init();
+	void perform();
+	void procHeaderLine(PIString & line);
+
+	static size_t writeMemoryFunc(void * contents, size_t size, size_t nmemb, void * ptr);
+	static size_t readMemoryFunc(void * contents, size_t size, size_t nmemb, void * ptr);
+	static size_t headerFunc(char * contents, size_t size, size_t nmemb, void * ptr);
+	int infoFunc(ssize_t dltotal, ssize_t dlnow, ssize_t ultotal, ssize_t ulnow);
+	int debugFunc(int type, char * data, size_t size);
+
+	PIString url;
+	PIString last_error;
+	PIByteArray buffer_out;
+	PIHTTP::MessageMutable request, reply;
+	std::atomic_bool is_cancel = {false};
+	ssize_t read_pos           = 0;
+	std::function<void(const PIHTTP::MessageConst &)> on_finish, on_error, on_abort;
+};
+
+
+#endif