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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2015-xxxx
license		=	bsd



%%	header

/**	@file
	Generic dk4_stream_t API for input
				from Windows file handle.
*/

#ifndef DK4CONF_H_INCLUDED
#include "dk4conf.h"
#endif

#if DK4_ON_WINDOWS

#ifndef DK4TYPES_H_INCLUDED
#include "dk4types.h"
#endif

#ifndef WINDOWS_H_INCLUDED
#include <windows.h>
#define	WINDOWS_H_INCLUDED 1
#endif

#ifndef DK4ERROR_H_INCLUDED
#include "dk4error.h"
#endif

#ifndef DK4STRM_H_INCLUDED
#include "dk4strm.h"
#endif

#ifndef STDIO_H_INCLUDED
#include <stdio.h>
#define	STDIO_H_INCLUDED 1
#endif

/**	Structure for keeping a HANDLE.
*/
typedef struct {
  HANDLE		ha;	/**< Windows file handle. */
  int			feof;	/**< Flag: Found EOF while reading. */
} dk4_stream_handle_t;

#ifdef __cplusplus
extern "C" {
#endif

/**	Low level function to access a Windows handle.
	@param	api	The stream API structure for arguments and results.
*/
void
dk4stream_windows_handle_function(dk4_stream_api_t *api);

/**	Low level function to access a Windows handle and close it on
	dk4stream_close().
	@param	api	The stream API structure for arguments and results.
*/
void
dk4stream_windows_handle_with_close_function(dk4_stream_api_t *api);

/**	Open a stream for an existing handle.
	@param	ha	Existing file handle, not closed on dk4stream_close().
	@param	fl	Access flag: DK4_STREAM_READ,, DK4_STREAM_WRITE
			or (DK4_STREAM_READ | DK4_STREAM_WRITE).
	@param	ibs	Input buffer size (0 for default).
	@param	obs	Output buffer size (0 for default).
	@param	erp	Error report, may be NULL.
	@return	Pointer to new stream on success, NULL on error.
*/
dk4_stream_t *
dk4stream_open_for_windows_handle(
  HANDLE		 ha,
  int			 fl,
  size_t		 ibs,
  size_t		 obs,
  dk4_er_t		*erp
);

/**	Open a stream for an existing handle.
	@param	ha	Existing file handle, closed on dk4stream_close().
	@param	fl	Access flag: DK4_STREAM_READ,, DK4_STREAM_WRITE
			or (DK4_STREAM_READ | DK4_STREAM_WRITE).
	@param	ibs	Input buffer size (0 for default).
	@param	obs	Output buffer size (0 for default).
	@param	erp	Error report, may be NULL.
	@return	Pointer to new stream on success, NULL on error.
*/
dk4_stream_t *
dk4stream_open_for_windows_handle_with_close(
  HANDLE		 ha,
  int			 fl,
  size_t		 ibs,
  size_t		 obs,
  dk4_er_t		*erp
);

#ifdef __cplusplus
}
#endif


#endif

%%	module

#include "dk4conf.h"

#if DK4_ON_WINDOWS

#include "dk4strmh.h"

#ifndef DK4MEM_H_INCLUDED
#include "dk4mem.h"
#endif

/**	Low level function to access a Windows handle.
	@param	api	The stream API structure for arguments and results.
	@param	wc	Flag: Close handle when closing the stream.
*/
static
void
dk4stream_windows_handle_static_function(dk4_stream_api_t *api, int wc)
{
  dk4_stream_handle_t	*sh;
  DWORD			 dwi;
  DWORD			 dwo;

  if (NULL != api) {
    api->res = 0;
    api->sz_out = 0;
    sh = (dk4_stream_handle_t *)(api->d);
    if (NULL != sh) {
      switch (api->cmd) {
        case DK4_STREAM_API_READ : {
	  if (0 == sh->feof) {
	    if ((dk4_um_t)0xFFFFFFFFUL < (dk4_um_t)(api->sz_in)) {
	      dwi = 0xFFFFFFFFUL;
	    } else {
	      dwi = (DWORD)(api->sz_in);
	    }
	    dwo = (DWORD)0UL;
	    if (ReadFile(sh->ha, api->b, dwi, &dwo, NULL)) {
	      if ((DWORD)0UL == dwo) { sh->feof = 1; }
	      api->sz_out = (size_t)dwo;
	      if ((DWORD)0UL < dwo) {
	        api->res = 1;
	      }
	    }
	  }
	} break;
	case DK4_STREAM_API_WRITE : {
	  if ((dk4_um_t)0xFFFFFFFFUL >= (dk4_um_t)(api->sz_in)) {
	    dwi = (DWORD)(api->sz_in);
	    dwo = (DWORD)0UL;
	    if (WriteFile(sh->ha, api->b, dwi, &dwo, NULL)) {
	      api->sz_out = dwo;
	      if (dwo == dwi) {
	        api->res = 1;
	      }
	    }
	  } else {
	    /* ERROR: Size too large */
	  }
	} break;
	case DK4_STREAM_API_FLUSH : {
	  api->res = 1;		/* Dont know how to flush */
	} break;
	case DK4_STREAM_API_AT_END : {
	  if (0 != sh->feof) {
	    api->res = 1;
	  }
	} break;
	case DK4_STREAM_API_CLOSE : {
	  if (0 != wc) {
	    if (CloseHandle(sh->ha)) {
	      api->res = 1;
	    }
	  } else {
	    api->res = 1;
	  }
	  dk4mem_free(sh);
	} break;
      }
    }
  }
}



void
dk4stream_windows_handle_with_close_function(dk4_stream_api_t *api)
{
  dk4stream_windows_handle_static_function(api, 1);
}



void
dk4stream_windows_handle_function(dk4_stream_api_t *api)
{
  dk4stream_windows_handle_static_function(api, 0);
}



dk4_stream_t *
dk4stream_open_for_windows_handle(
  HANDLE		 ha,
  int			 fl,
  size_t		 ibs,
  size_t		 obs,
  dk4_er_t		*erp
)
{
  dk4_stream_handle_t	*sh	= NULL;
  dk4_stream_t		*back	= NULL;
  
  sh = dk4mem_new(dk4_stream_handle_t,1,erp);
  if (NULL != sh) {
    sh->ha   = ha;
    sh->feof = 0;
    back = dk4stream_open(
      (void *)sh, dk4stream_windows_handle_function, fl, ibs, obs, erp
    );
    if (NULL == back) {
      dk4mem_free(sh);
    }
  }
  return back;
}



dk4_stream_t *
dk4stream_open_for_windows_handle_with_close(
  HANDLE		 ha,
  int			 fl,
  size_t		 ibs,
  size_t		 obs,
  dk4_er_t		*erp
)
{
  dk4_stream_handle_t	*sh	= NULL;
  dk4_stream_t		*back	= NULL;
  
  sh = dk4mem_new(dk4_stream_handle_t,1,erp);
  if (NULL != sh) {
    sh->ha   = ha;
    sh->feof = 0;
    back = dk4stream_open(
      (void *)sh, dk4stream_windows_handle_with_close_function,
      fl, ibs, obs, erp
    );
    if (NULL == back) {
      dk4mem_free(sh);
    }
  }
  return back;
}



#endif
/* if DK4_ON_WINDOWS */