0023533: Unitialized variables used, IntTools_TopolTool.cxx

[occt.git] / src / Xw / Xw_load_image.cxx

// Copyright (c) 1999-2012 OPEN CASCADE SAS
//
// The content of this file is subject to the Open CASCADE Technology Public
// License Version 6.5 (the "License"). You may not use the content of this file
// except in compliance with the License. Please obtain a copy of the License
// at http://www.opencascade.org and read it completely before using this file.
//
// The Initial Developer of the Original Code is Open CASCADE S.A.S., having its
// main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France.
//
// The Original Code and all software distributed under the License is
// distributed on an "AS IS" basis, without warranty of any kind, and the
// Initial Developer hereby disclaims all such warranties, including without
// limitation, any warranties of merchantability, fitness for a particular
// purpose or non-infringement. Please see the License for the specific terms
// and conditions governing the rights and limitations under the License.


/*
 * Modified:  zov : 21-Apr-1998  : Reads a BMP/GIF/XWD image from file
 *

   XW_EXT_IMAGEDATA* Xw_load_image (awindow,aimageinfo,filename):
   XW_EXT_WINDOW  *awindow
   XW_USERDATA    *aimageinfo
   char           *filename     - XWD/BMP/GIF file name

   Get an image from a file named filename.

   Returns the image descriptor address if successful,
	         or  NULL if an error occured.

   Note!
   It is strictly recommended to pass the filename with extension.
   Otherwise an extension env(CSF_DefaultImageFormat) is appended.
   In fact, it doesn't matter what extension has been used, because
   file format will be automatically detected. (zov)
*/

#define PRO16753       /* GG 261198
//              1) Don't free pname because this pointer is a
//              static address in Xw_get_filename() space.
//              2) open() C function return a int number < 0
//              when the open failed.
*/

#include <Xw_Extension.h>
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <fcntl.h>
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif

#ifdef TRACE
#define TRACE_LOAD_IMAGE
#endif

#ifdef XW_PROTOTYPE
XW_EXT_IMAGEDATA* Xw_load_xwd_image (void*, void*, char*, int, XColor**, int*);
XW_EXT_IMAGEDATA* Xw_load_bmp_image (void*, void*, char*, int, XColor**, int*);
XW_EXT_IMAGEDATA* Xw_load_gif_image (void*, void*, char*, int, XColor**, int*);

void* Xw_load_image (void *awindow,void *aimageinfo,char *filename)
#else
XW_EXT_IMAGEDATA* Xw_load_xwd_image ();
XW_EXT_IMAGEDATA* Xw_load_bmp_image ();
XW_EXT_IMAGEDATA* Xw_load_gif_image ();

void* Xw_load_image (awindow,aimageinfo,filename)
     void *awindow;
     void *aimageinfo;
     char *filename ;
#endif /*XW_PROTOTYPE*/
{
  XW_EXT_WINDOW *pwindow = (XW_EXT_WINDOW *)awindow;
  XW_EXT_IMAGEDATA *pimage;
  XW_STATUS status;
  XColor *pcolors = NULL;
  int ncolors = 0, fimage = 0;
  //  char *wname = NULL, *pname, *pchDefExt, achHeader[8];
  char *pname, *pchDefExt, achHeader[8];


  if( !Xw_isdefine_window(pwindow) ) {
    /*ERROR*Bad EXT_WINDOW Address*/
    Xw_set_error(24,"Xw_load_image",pwindow) ;
    return (NULL) ;
  }


  /* Append desired extension to the file name if no ext. has been specified */
  pchDefExt = getenv ("CSF_DefaultImageFormat");
  pname = Xw_get_filename (filename,(char*)( pchDefExt? pchDefExt: "xwd"));

  
#ifdef DEBUG
  fprintf (stderr, "\r\nXw_load_image: Loading '%s' (extended name: %s)...",
	   filename, pname? pname: "NULL");
#endif /*DEBUG*/
  

  /* Open the file
   * and detect the image format using signature
   */
  if (pname) {

    static int _bFirstTime = 1;
    if (_bFirstTime) {

      _bFirstTime = 0;

      if (!pchDefExt)
        fprintf (stderr,
		 "\r\nWarning: variable CSF_DefaultImageFormat is undefined!"
		 " Assuming 'xwd'.\r\n");
      else if (strlen (pchDefExt) != 3 ||
	          0 != strcasecmp (pchDefExt, "xwd")
	       && 0 != strcasecmp (pchDefExt, "bmp")
	       && 0 != strcasecmp (pchDefExt, "gif"))
        fprintf (stderr,
		 "\r\nWarning: value '%s' of CSF_DefaultImageFormat "
		 "is incorrect!\r\n", pchDefExt);
    }

    fimage = open (pname, O_RDONLY);

#ifndef PRO16753
    Xw_free (pname);
#endif
  }

#ifdef PRO16753
  if( fimage < 0 ) {
#else
  if (!fimage) {
#endif

    fprintf (stderr, "\r\nXw_load_image: Error: "
	     "Can't open file '%s'!", filename);
    return (NULL);
  }
  if (read (fimage, achHeader,sizeof (achHeader)) != sizeof (achHeader)) {

    fprintf (stderr, "\r\nXw_load_image: Error: "
	     "Can't read file '%s' to determine format!", filename);
    close(fimage);
    return (NULL);
  }

  lseek (fimage, 0, SEEK_SET);


  /*
   * Detect file format; then load the image
   * and obtain array of colors used
   */
  if (0 == strncmp (achHeader, "GIF87a", 6))
    pimage = Xw_load_gif_image (pwindow, aimageinfo, filename,
				fimage, &pcolors, &ncolors);
  else if (0 == strncmp (achHeader, "GIF89a", 6)) {

    fprintf (stderr, 
	     "\r\nXw_load_image: Warning: GIF89a format specified (file %s).",
	     filename);
    pimage = Xw_load_gif_image (pwindow, aimageinfo, filename,
				fimage, &pcolors, &ncolors);
  }
  else if (0 == strncmp (achHeader, "BM", 2))
    pimage = Xw_load_bmp_image (pwindow, aimageinfo, filename,
				fimage, &pcolors, &ncolors);
  else /* Then it must be XWD */
    pimage = Xw_load_xwd_image (pwindow, aimageinfo, filename,
				fimage, &pcolors, &ncolors);

  close (fimage);


  if (! pimage) {

    fprintf (stderr, "\r\nXw_load_image: Error: Failed to read %s!",
	     filename);
    close(fimage);
    return (NULL);
  }


  /* Color relocation:
   * Converse image to what the window format supports.
   */
  status = Xw_convert_image (pwindow, pimage, pcolors, ncolors);

  if (pcolors)
    Xw_free(pcolors);

  if( status == XW_ERROR ) {
    Xw_del_imagedata_structure (pimage) ;
    return (NULL) ;
  }


#ifdef  TRACE_LOAD_IMAGE
  if( Xw_get_trace() ) {
    printf (" %lx = Xw_load_image(%lx,'%s')\n",(long ) pimage,(long ) pwindow,filename);
  }
#endif
  return (pimage);
}