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%%	options

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


%%	header

/**	@file
	Open a stream to write a file.
*/

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

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

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

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

#ifndef DK4STRMF_H_INCLUDED
#include "dk4strmf.h"
#endif

#ifndef DK4STRMG_H_INCLUDED
#include "dk4strmg.h"
#endif

#ifndef DK4STRMB_H_INCLUDED
#include "dk4strmb.h"
#endif



#ifdef __cplusplus
extern "C" {
#endif

/**	Open a stream to write a file.
	CRT on Windows: Optional, disabling CRT reduces functionality
	by disabling the gzip and bzip2 compression libraries.
	@param	filename	File name of file to write.
	@param	erp		Error report, may be NULL.
	@return	Pointer to stream on success, NULL on error.
	- DK4_E_INVALID_ARGUMENTS<br>
	  if filename is NULL,
	- DK4_E_MATH_OVERFLOW<br>
	  if ibs or obs is too large,
	- DK4_E_MEMORY_ALLOCATION_FAILED<br>
	  if allocation of input or output buffer failed.
*/

dk4_stream_t *
dk4stream_open_file_writer(const dkChar *filename, dk4_er_t *erp);

#ifdef __cplusplus
}
#endif



%%	module

#include "dk4conf.h"

#if DK4_ON_WINDOWS && DK4_WIN_DENY_CRT
#ifndef WINDOWS_H_INCLUDED
#include <windows.h>
#define	WINDOWS_H_INCLUDED 1
#endif
#ifndef DK4STRMH_H_INCLUDED
#include "dk4strmh.h"
#endif
#endif

#include "dk4strmw.h"

#ifndef DK4FD_H_INCLUDED
#include "dk4fd.h"
#endif

#ifndef DK4PATH_H_INCLUDED
#include "dk4pathd.h"
#endif

#ifndef DK4STRD_H_INCLUDED
#include "dk4strd.h"
#endif

#ifndef DK4FOPD_H_INCLUDED
#include "dk4fopd.h"
#endif



$!trace-include



/**	Compression suffixes.
*/
static const dkChar * const	dk4strmw_co_su[] = {
$!string-table macro=dkT
.gz
.svgz
.bz2
$!end
};



/**	File mode for binary writing.
*/
static const char	dk4strmw_c8_mode[] = { "wb" };



/**	File mode for binary writing.
*/
static const dkChar	dk4strmw_dk_mode[] = { dkT("wb") };



dk4_stream_t *
dk4stream_open_file_writer(const dkChar *filename, dk4_er_t *erp)
{
  dk4_stream_t	*back	= NULL;	/* Function result */
  dkChar	*p1	= NULL;	/* File name suffix */
#if DK4_HAVE_ZLIB_H && (!(DK4_ON_WINDOWS && DK4_WIN_DENY_CRT))
  gzFile	 gzf	= NULL;	/* gzip compressed output file */
#endif
#if DK4_HAVE_BZLIB_H && (!(DK4_ON_WINDOWS && DK4_WIN_DENY_CRT))
  BZFILE	*bzf	= NULL;	/* bzip2 compressed output file */
#endif
  FILE		*fipo	= NULL;	/* Output file */
#if DK4_ON_WINDOWS && DK4_WIN_DENY_CRT
  HANDLE	 fha	= INVALID_HANDLE_VALUE;
  DWORD		 dwattr	= (DWORD)0UL;
#endif
  int		 coi	= -1;	/* Compression algorithm index */
#if DK4_CHAR_SIZE > 1
  int		 fd	= -1;	/* File descriptor */
#endif

  $? "+ dk4stream_open_file_writer \"%!ds\"", TR_STR(filename)
  if (NULL != filename) {
    p1 = dk4path_get_suffix(filename, erp);
    if (NULL != p1) {				$? ". suffix \"%!ds\"", p1
      coi = dk4str_array_index(
        dk4strmw_co_su, p1, DK4_HAVE_CASE_INSENSITIVE_PATHNAMES
      );
      if (0 > coi) { coi = -1; }
    }
#if	TRACE_DEBUG
    else {					$? ". no suffix"
    }
#endif
    if (0 != dk4fopen_check(filename, 1, DK4_FOPEN_SC_IS_REGULAR, erp)) {
      switch (coi) {
        case 0: case 1: {			$? ". gzip"
#if DK4_HAVE_ZLIB_H && (!(DK4_ON_WINDOWS && DK4_WIN_DENY_CRT))
#if DK4_CHAR_SIZE > 1
	  /* +++++ gzip, wchar_t */
	  $? ". gzip mit wchar_t"
	  fd = dk4fd_wc_open(
	    filename,
	    (DK4_O_WRONLY | DK4_O_BINARY | DK4_O_TRUNC | DK4_O_CREAT),
	    erp
	  );
	  if (-1 < fd) {
	    gzf = gzdopen(fd, dk4strmw_c8_mode);
	    if (NULL != gzf) {
	      back = dk4stream_open_for_gzfile_with_close(
	        gzf, DK4_STREAM_WRITE, 1024, 4096, erp
	      );
	      if (NULL == back) {		$? "! failed to open stream"
	        gzclose(gzf);
	      }
#if	TRACE_DEBUG
	      else {				$? ". stream opened"
	      }
#endif
	    } else {				$? "! failed to open gzf"
	      dk4error_set_simple_error_code(erp, DK4_E_OPEN_WRITE_FAILED);
	      (void)dk4fd_close(fd, NULL);
	    }
	  }
#if TRACE_DEBUG
	  else {				$? "! failed to open fd"
	  }
#endif
	  /* ----- gzip, wchar_t */
#else
	  /* +++++ gzip, char */
	  $? ". gzip char"
	  gzf = gzopen(filename, dk4strmw_c8_mode);
	  if (NULL != gzf) {
	    back = dk4stream_open_for_gzfile_with_close(
	      gzf, DK4_STREAM_WRITE, 1024, 4096, erp
	    );
	    if (NULL == back) {			$? "! failed to open stream"
	      gzclose(gzf);
	    }
#if	TRACE_DEBUG
	    else {				$? ". stream opened"
	    }
#endif
	  } else {				$? "! failed to open gzf"
	    dk4error_set_simple_error_code(erp, DK4_E_OPEN_WRITE_FAILED);
	  }
	  /* ----- gzip, char */
#endif
#else
	  dk4error_set_simple_error_code(erp, DK4_E_NOT_SUPPORTED);
#endif
	} break;
	case 2: {				$? ". bzip"
#if DK4_HAVE_BZLIB_H && (!(DK4_ON_WINDOWS && DK4_WIN_DENY_CRT))
#if DK4_CHAR_SIZE > 1
	  /* +++++ bzip2, wchar_t */
	  $? ". bzip2 wchar_t"
	  fd = dk4fd_wc_open(
	    filename,
	    (DK4_O_WRONLY | DK4_O_BINARY | DK4_O_TRUNC | DK4_O_CREAT),
	    erp
	  );
	  if (-1 < fd) {
	    bzf = BZ2_bzdopen(fd, dk4strmw_c8_mode);
	    if (NULL != bzf) {
	      back = dk4stream_open_for_bzfile_with_close(
	        bzf, DK4_STREAM_WRITE, 1024, 4096, erp
	      );
	      if (NULL == back) {		$? "! failed to open stream"
	        BZ2_bzclose(bzf);
	      }
#if	TRACE_DEBUG
	      else {				$? ". stream opened"
	      }
#endif
	    } else {				$? "! failed to open bzf"
	      dk4error_set_simple_error_code(erp, DK4_E_OPEN_WRITE_FAILED);
	      (void)dk4fd_close(fd, NULL);
	    }
	  } else {				$? "! failed to open fd"
	    dk4error_set_simple_error_code(erp, DK4_E_OPEN_WRITE_FAILED);
	  }
	  /* ----- bzip2, wchar_t */
#else
	  /* +++++ bzip2, char */
	  $? ". bzip2 char"
	  bzf = BZ2_bzopen(filename, dk4strmw_c8_mode);
	  if (NULL != bzf) {
	    back = dk4stream_open_for_bzfile_with_close(
	      bzf, DK4_STREAM_WRITE, 1024, 4096, erp
	    );
	    if (NULL == back) {			$? "! failed to open stream"
	      BZ2_bzclose(bzf);
	    }
#if	TRACE_DEBUG
	    else {				$? ". stream opened"
	    }
#endif
	  } else {				$? "! failed to open bzf"
	    dk4error_set_simple_error_code(erp, DK4_E_OPEN_WRITE_FAILED);
	  }
	  /* ----- bzip2, char */
#endif
#else
	  dk4error_set_simple_error_code(erp, DK4_E_NOT_SUPPORTED);
#endif
	} break;
	default: {				$? ". plain file"
#if DK4_ON_WINDOWS && DK4_WIN_DENY_CRT
	  $? ". Windows without CRT"
	  dwattr =  FILE_ATTRIBUTE_NORMAL;
	  dwattr |= FILE_FLAG_BACKUP_SEMANTICS;
	  dwattr |= FILE_FLAG_SEQUENTIAL_SCAN;
#if DK4_CHAR_SIZE > 1
	  fha = CreateFileW(
	    filename, GENERIC_WRITE, 0, NULL,
	    CREATE_ALWAYS, dwattr, NULL
	  );
#else
	  fha = CreateFileA(
	    filename, GENERIC_WRITE, 0, NULL,
	    CREATE_ALWAYS, dwattr, NULL
	  );
#endif
	  if (INVALID_HANDLE_VALUE != fha) {
	    back = dk4stream_open_for_windows_handle_with_close(
	      fha, DK4_STREAM_WRITE, 1024, 4096, erp
	    );
	    if (NULL == back) {			$? "! failed to open stream"
	      (void)CloseHandle(fha);
	    }
#if	TRACE_DEBUG
	    else {				$? ". stream opened"
	    }
#endif
	  } else {				$? "! CreataeFile failed"
	    dk4error_set_simple_error_code(erp, DK4_E_OPEN_WRITE_FAILED);
	  }
#else
	  $? ". Windows with CRT allowed"
	  fipo = dk4fopen(
	    filename, dk4strmw_dk_mode, DK4_FOPEN_SC_IS_REGULAR, erp
	  );
	  if (NULL != fipo) {
	    back = dk4stream_open_for_file_with_close(
	      fipo, DK4_STREAM_WRITE, 1024, 4096, erp
	    );
	    if (NULL == back) {		$? "! failed to open stream"
	      (void)fclose(fipo);
	    }
#if	TRACE_DEBUG
	    else {			$? ". stream opened"
	    }
#endif
	  } else {			$? "! fipo"
	  }
#endif
	} break;
      }
    } else {				$? "! file check failed"
    }
  } else {				$? "! no filename"
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  $? "- dk4stream_open_file_writer %d", TR_IPTR(back)
  return back;
}