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path: root/support/dktools/dk4strmh.c
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/*
	WARNING: This file was generated by dkct.
	Changes you make here will be lost if dkct is run again!
	You should modify the original source and run dkct on it.
	Original source: dk4strmh.ctr
*/

/*
Copyright (C) 2015-2017, Dirk Krause

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice,
  this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above opyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.
* Neither the name of the author nor the names of contributors may be used
  to endorse or promote products derived from this software without specific
  prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.
IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

/**	@file dk4strmh.c The dk4strmh module.
*/


#line 112 "dk4strmh.ctr"

#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 */