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 //
 // Provides support for FastCGI via C++ iostreams.
 //
 // $Id: fcgio.h,v 1.15 2002/02/25 13:16:11 robs Exp $
 //
 // This work is based on routines written by George Feinberg. They
 // have been mostly re-written and extensively changed by
 // Michael Richards.
 //
 // Rewritten again with bug fixes and numerous enhancements by
 // Michael Shell.
 // 
 // And rewritten again by Rob Saccoccio. 
 //
 // Special Thanks to Dietmar Kuehl for his help and the numerous custom
 // streambuf examples on his web site.
 //
 // Copyright (c) 2000 Tux the Linux Penguin
 // Copyright (c) 2001 Rob Saccoccio and Chelsea Networks
 //
 // You are free to use this software without charge or royalty
 // as long as this notice is not removed or altered, and recognition
 // is given to the author(s)
 //
 // This code is offered as-is without any warranty either expressed or
 // implied; without even the implied warranty of MERCHANTABILITY or
 // FITNESS FOR A PARTICULAR PURPOSE.  If it breaks, you get to keep 
 // both halves.
 
 #ifndef FCGIO_H
 #define FCGIO_H
 
 #include <iostream>
 
 #include "fcgiapp.h"
 
 #ifndef DLLAPI
 #if defined (_WIN32) && defined (_MSC_VER)
 #define DLLAPI __declspec(dllimport)
 #else
 #define DLLAPI
 #endif
 #endif
 
 #if ! HAVE_STREAMBUF_CHAR_TYPE
 typedef char char_type;
 #endif
 
 /*
  *  fcgi_streambuf
  */
 class DLLAPI fcgi_streambuf : public std::streambuf
 {
 public:
 
     // Note that if no buf is assigned (the default), iostream methods
     // such as peek(), unget() and putback() will fail.  If a buf is
     // assigned, I/O is a bit less efficient and output streams will
     // have to be flushed (or the streambuf destroyed) before the next 
     // call to "accept".
     fcgi_streambuf(FCGX_Stream * fcgx, char * buf, int len);
     
     fcgi_streambuf(char_type * buf, std::streamsize len);
     
     fcgi_streambuf(FCGX_Stream * fcgx = 0);
 
     ~fcgi_streambuf(void);
 
     int attach(FCGX_Stream * fcgx);
 
 protected:
 
     // Consume the put area (if buffered) and c (if c is not EOF).
     virtual int overflow(int);
 
     // Flush the put area (if buffered) and the FCGX buffer to the client.
     virtual int sync();
 
     // Remove and return the current character.
     virtual int uflow();
 
     // Fill the get area (if buffered) and return the current character.
     virtual int underflow();
 
     // Use a buffer.  The only reasons that a buffer would be useful is
     // to support the use of the unget()/putback() or seek() methods.  Using
     // a buffer will result in less efficient I/O.  Note: the underlying
     // FastCGI library (FCGX) maintains its own input and output buffers.  
     virtual std::streambuf * setbuf(char_type * buf, std::streamsize len);
 
     virtual std::streamsize xsgetn(char_type * s, std::streamsize n);
     virtual std::streamsize xsputn(const char_type * s, std::streamsize n);
 
 private:
 
     FCGX_Stream * fcgx;
 
     // buf is just handy to have around
     char_type * buf;
 
     // this isn't kept by the base class
     std::streamsize bufsize;
     
     void init(FCGX_Stream * fcgx, char_type * buf, std::streamsize bufsize);
 
     void reset(void);
 };
 
 /*
  *  fcgi_istream - deprecated
  */
 class DLLAPI fcgi_istream : public std::istream
 {
 public:
 
     // deprecated
     fcgi_istream(FCGX_Stream * fcgx = 0);
     
     // deprecated
     ~fcgi_istream(void) {}
 
     // deprecated
     virtual void attach(FCGX_Stream * fcgx);
 
 private:
 
     fcgi_streambuf fcgi_strmbuf;
 };
 
 /*
  *  fcgi_ostream - deprecated
  */
 class DLLAPI fcgi_ostream : public std::ostream
 {
 public:
     
     // deprecated
     fcgi_ostream(FCGX_Stream * fcgx = 0);
     
     // deprecated
     ~fcgi_ostream(void) {}
 
     // deprecated
     virtual void attach(FCGX_Stream *fcgx);
 
 private:
 
     fcgi_streambuf fcgi_strmbuf;
 };
 
 #endif /* FCGIO_H */

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