- MDEV-11295: developing handling files contained in ZIP file.

A first experimental and limited implementation.
  modified:   storage/connect/CMakeLists.txt
  modified:   storage/connect/filamap.cpp
  new file:   storage/connect/filamzip.cpp
  new file:   storage/connect/filamzip.h
  modified:   storage/connect/ha_connect.cc
  new file:   storage/connect/ioapi.c
  new file:   storage/connect/ioapi.h
  modified:   storage/connect/mycat.cc
  modified:   storage/connect/plgdbsem.h
  modified:   storage/connect/plgdbutl.cpp
  modified:   storage/connect/tabdos.cpp
  modified:   storage/connect/tabdos.h
  modified:   storage/connect/tabfmt.cpp
  modified:   storage/connect/tabfmt.h
  modified:   storage/connect/tabjson.cpp
  modified:   storage/connect/tabjson.h
  new file:   storage/connect/tabzip.cpp
  new file:   storage/connect/tabzip.h
  new file:   storage/connect/unzip.c
  new file:   storage/connect/unzip.h
  new file:   storage/connect/zip.c

storage/connect/tabzip.h

@@ -0,0 +1,100 @@
+/*************** tabzip H Declares Source Code File (.H) ***************/
+/*  Name: tabzip.h   Version 1.0                                       */
+/*                                                                     */
+/*  (C) Copyright to the author Olivier BERTRAND          2016         */
+/*                                                                     */
+/*  This file contains the ZIP classe declares.                        */
+/***********************************************************************/
+#include "osutil.h"
+#include "block.h"
+#include "colblk.h"
+#include "xtable.h"
+#include "unzip.h"
+
+typedef class ZIPDEF *PZIPDEF;
+typedef class TDBZIP *PTDBZIP;
+typedef class ZIPCOL *PZIPCOL;
+
+/***********************************************************************/
+/*  ZIP table: display info about a ZIP file.                          */
+/***********************************************************************/
+class DllExport ZIPDEF : public DOSDEF {          /* Table description */
+	friend class TDBZIP;
+	friend class ZIPFAM;
+public:
+	// Constructor
+	ZIPDEF(void) {}
+
+	// Implementation
+	virtual const char *GetType(void) {return "ZIP";}
+
+	// Methods
+	virtual bool DefineAM(PGLOBAL g, LPCSTR am, int poff);
+	virtual PTDB GetTable(PGLOBAL g, MODE m);
+
+protected:
+	// Members
+	PSZ         target;								 // The inside file to query
+}; // end of ZIPDEF
+
+/***********************************************************************/
+/*  This is the ZIP Access Method class declaration.                   */
+/***********************************************************************/
+class DllExport TDBZIP : public TDBASE {
+	friend class ZIPCOL;
+public:
+	// Constructor
+	TDBZIP(PZIPDEF tdp);
+
+	// Implementation
+	virtual AMT  GetAmType(void) {return TYPE_AM_ZIP;}
+
+	// Methods
+	virtual PCOL MakeCol(PGLOBAL g, PCOLDEF cdp, PCOL cprec, int n);
+	virtual int  Cardinality(PGLOBAL g);
+	virtual int  GetMaxSize(PGLOBAL g);
+	virtual int  GetRecpos(void) {return 0;}
+
+	// Database routines
+	virtual bool OpenDB(PGLOBAL g);
+	virtual int  ReadDB(PGLOBAL g);
+	virtual int  WriteDB(PGLOBAL g);
+	virtual int  DeleteDB(PGLOBAL g, int irc);
+	virtual void CloseDB(PGLOBAL g);
+
+protected:
+	bool open(PGLOBAL g, const char *filename);
+	void close(void);
+
+	// Members
+	unzFile         zipfile;							   // The ZIP container file
+	PSZ             zfn;									   // The ZIP file name
+//PSZ             target;
+	unz_file_info64 finfo;									 // The current file info
+	char            fn[FILENAME_MAX];     	 // The current file name
+	int             nexterr;								 // Next file error
+}; // end of class TDBZIP
+
+/***********************************************************************/
+/*  Class ZIPCOL: ZIP access method column descriptor.                 */
+/***********************************************************************/
+class DllExport ZIPCOL : public COLBLK {
+	friend class TDBZIP;
+public:
+	// Constructors
+	ZIPCOL(PCOLDEF cdp, PTDB tdbp, PCOL cprec, int i, PSZ am = "ZIP");
+
+	// Implementation
+	virtual int  GetAmType(void) { return TYPE_AM_ZIP; }
+
+	// Methods
+	virtual void ReadColumn(PGLOBAL g);
+
+protected:
+	// Default constructor not to be used
+	ZIPCOL(void) {}
+
+	// Members
+	TDBZIP *Tdbz;
+	int     flag;
+}; // end of class ZIPCOL