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%%	options

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


%%	header

/**	@file
	Open stream to read 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 read 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 read.
	@param	erp		Error report, may be NULL.
	@return	Pointer to stream on success, NULL on error.
	DK4_E_INVALID_ARGUMENTS		if filename is NULL,
	DK4_E_MATH_OVERFLOW		if ibs or obs is too large,
	DK4_E_MEMORY_ALLOCATION_FAILED	if allocation of input or output buffer
					failed.
*/

dk4_stream_t *
dk4stream_open_file_reader(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 "dk4strmr.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	dk4strmr_co_su[] = {
$!string-table macro=dkT
.gz
.bz2
.svgz
$!end
};



/**	File mode for binary reading.
*/
static const char	dk4strmr_c8_mode[] = { "rb" };

/**	File mode for binary reading.
*/
static const dkChar	dk4strmr_dk_mode[] = { dkT("rb") };


dk4_stream_t *
dk4stream_open_file_reader(const dkChar *filename, dk4_er_t *erp)
{
  dk4_stream_t	*back	= NULL;	/* Function result */
  const dkChar	*p1	= NULL;	/* Suffix pointer */
#if DK4_HAVE_ZLIB_H && (!(DK4_ON_WINDOWS && DK4_WIN_DENY_CRT))
  gzFile	 gzf	= NULL;	/* gzip compressed input file */
#endif
#if DK4_HAVE_BZLIB_H && (!(DK4_ON_WINDOWS && DK4_WIN_DENY_CRT))
  BZFILE	*bzf	= NULL;	/* bzip2 compressed input file */
#endif
  FILE		*fipo	= NULL;	/* Input 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_reader \"%!ds\"", filename
  if (NULL != filename) {
    p1 = dk4path_get_suffix(filename, erp);
    if (NULL != p1) {			$? ". file name suffix \"%!ds\"", p1
      coi = dk4str_array_index(
        dk4strmr_co_su, p1, DK4_HAVE_CASE_INSENSITIVE_PATHNAMES
      );
      if (0 > coi) coi = -1;		$? ". coi = %d", coi
    }
    if (0 != dk4fopen_check(filename, 0, DK4_FOPEN_SC_IS_REGULAR, erp)) {
      $? ". fopen check ok"
      switch (coi) {
        case 1: {
#if DK4_HAVE_BZLIB_H && (!(DK4_ON_WINDOWS && DK4_WIN_DENY_CRT))
#if DK4_CHAR_SIZE > 1
	  /* +++++ bzip2, wchar_t */
	  $? ". bzip2 for wchar_t"
	  fd = dk4fd_wc_open(filename, (DK4_O_RDONLY | DK4_O_BINARY), erp);
	  if (-1 < fd) {
	    bzf = BZ2_bzdopen(fd, dk4strmr_c8_mode);
	    if (NULL != bzf) {
	      back = dk4stream_open_for_bzfile_with_close(
	        bzf, DK4_STREAM_READ, 4096, 1024, erp
	      );
	      if (NULL == back) {
	        BZ2_bzclose(bzf);
	      }
	    } else {
	      dk4error_set_simple_error_code(erp, DK4_E_OPEN_READ_FAILED);
	      (void)dk4fd_close(fd, NULL);
	    }
	  } else {
	    dk4error_set_simple_error_code(erp, DK4_E_OPEN_READ_FAILED);
	  }
	  /* ----- bzip2, wchar_t */
#else
	  /* +++++ bzip2, char */
	  $? ". bzip2 for char"
	  bzf = BZ2_bzopen(filename, dk4strmr_c8_mode);
	  if (NULL != bzf) {
	    back = dk4stream_open_for_bzfile_with_close(
	      bzf, DK4_STREAM_READ, 4096, 1024, erp
	    );
	    if (NULL == back) {
	      BZ2_bzclose(bzf);
	    }
	  } else {
	    dk4error_set_simple_error_code(erp, DK4_E_OPEN_READ_FAILED);
	  }
	  /* ----- bzip2, char */
#endif
#else
	  dk4error_set_simple_error_code(erp, DK4_E_NOT_SUPPORTED);
#endif
        } break;
        case 0: case 2: {			$? ". gzip"
#if DK4_HAVE_ZLIB_H && (!(DK4_ON_WINDOWS && DK4_WIN_DENY_CRT))
#if DK4_CHAR_SIZE > 1
	  $? ". gzip for wide characters"
	  /* +++++ gzip, wchar_t */
	  fd = dk4fd_wc_open(filename, (DK4_O_RDONLY | DK4_O_BINARY), erp);
	  if (-1 < fd) {
	    gzf = gzdopen(fd, dk4strmr_c8_mode);
	    if (NULL != gzf) {
	      back = dk4stream_open_for_gzfile_with_close(
	        gzf, DK4_STREAM_READ, 4096, 1024, erp
	      );
	      if (NULL == back) {
	        gzclose(gzf);
	      }
	    } else {
	      dk4error_set_simple_error_code(erp, DK4_E_OPEN_READ_FAILED);
	      (void)dk4fd_close(fd, NULL);
	    }
	  }
	  /* ----- gzip, wchar_t */
#else
	  $? ". gzip for char"
	  /* +++++ gzip, char */
	  gzf = gzopen(filename, dk4strmr_c8_mode);
	  if (NULL != gzf) {
	    back = dk4stream_open_for_gzfile_with_close(
	      gzf, DK4_STREAM_READ, 4096, 1024, erp
	    );
	    if (NULL == back) {
	      gzclose(gzf);
	    }
	  } else {
	    dk4error_set_simple_error_code(erp, DK4_E_OPEN_READ_FAILED);
	  }
	  /* ----- gzip, char */
#endif
#else
	  dk4error_set_simple_error_code(erp, DK4_E_NOT_SUPPORTED);
#endif
        } break;
        default: {			$? ". simple file"
#if DK4_ON_WINDOWS && DK4_WIN_DENY_CRT
	  dwattr =  FILE_ATTRIBUTE_NORMAL;
	  dwattr |= FILE_FLAG_BACKUP_SEMANTICS;
	  dwattr |= FILE_FLAG_SEQUENTIAL_SCAN;
#if DK4_CHAR_SIZE > 1
	  fha = CreateFileW(
	    filename, GENERIC_READ, FILE_SHARE_READ, NULL,
	    OPEN_EXISTING, dwattr, NULL
	  );
#else
	  fha = CreateFileA(
	    filename, GENERIC_READ, FILE_SHARE_READ, NULL,
	    OPEN_EXISTING, dwattr, NULL
	  );
#endif
	  if (INVALID_HANDLE_VALUE != fha) {
	    back = dk4stream_open_for_windows_handle_with_close(
	      fha, DK4_STREAM_READ, 4096, 1024, erp
	    );
	    if (NULL == back) {
	      (void)CloseHandle(fha);
	    }
	  } else {
	    dk4error_set_simple_error_code(erp, DK4_E_OPEN_READ_FAILED);
	  }
#else
	  fipo = dk4fopen(
	    filename, dk4strmr_dk_mode, DK4_FOPEN_SC_IS_REGULAR, erp
	  );
	  if (NULL != fipo) {		$? ". fopen ok"
	    back = dk4stream_open_for_file_with_close(
	      fipo, DK4_STREAM_READ, 4096, 1024, erp
	    );
	    if (NULL == back) {		$? "! stream open failed"
	      (void)fclose(fipo);
	    }
	  } else {			$? "! fipo"
	  }
#endif
	  $? ". simple file ended"
        } break;
      }
    } else {				$? "! file check failed"
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  } $? "- dk4stream_open_file_reader PTR=%d", TR_IPTR(back)
  return back;
}