support for huge files (patch 1002226)

[wxWidgets.git] / src / common / xpmdecod.cpp

diff --git a/src/common/xpmdecod.cpp b/src/common/xpmdecod.cpp
index 4b4e47e045eb2abf31da476a0fcfd802427a97ee..18597dd3c17c161df68cadf86f0090ff2ebbde79 100644 (file)
--- a/src/common/xpmdecod.cpp
+++ b/src/common/xpmdecod.cpp
@@ -90,7 +90,7 @@ license is as follows:
  * in this Software without prior written authorization from GROUPE BULL.
  */
 
-#ifdef __GNUG__
+#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
 #pragma implementation "xpmdecod.h"
 #endif
 
@@ -125,7 +125,7 @@ bool wxXPMDecoder::CanRead(wxInputStream& stream)
     unsigned char buf[9];
 
     if ( !stream.Read(buf, WXSIZEOF(buf)) )
-        return FALSE;
+        return false;
 
     stream.SeekI(-(off_t)WXSIZEOF(buf), wxFromCurrent);
 
@@ -178,7 +178,10 @@ wxImage wxXPMDecoder::ReadFile(wxInputStream& stream)
             if ( (*q == '*') && (*(q + 1) == '/') )
                 break;
         }
-        strcpy(p, q + 2);
+
+        // memmove allows overlaps (unlike strcpy):
+        size_t cpylen = strlen(q + 2) + 1;
+        memmove(p, q + 2, cpylen);
     }
 
     /*
@@ -236,11 +239,7 @@ wxImage wxXPMDecoder::ReadFile(wxInputStream& stream)
      */
     wxImage img = ReadData(xpm_lines);
 
-#ifdef __WIN16__
-    delete[] (char**) xpm_lines;
-#else
     delete[] xpm_lines;
-#endif
 
     return img;
 }
@@ -547,8 +546,8 @@ static bool GetRGBFromName(const char *inname, bool *isNone,
         *r = ParseHexadecimal(inname[1], inname[2]);
         *g = ParseHexadecimal(inname[1*ofs+1], inname[1*ofs+2]);
         *b = ParseHexadecimal(inname[2*ofs+1], inname[2*ofs+2]);
-        *isNone = FALSE;
-        return TRUE;
+        *isNone = false;
+        return true;
     }
 
     name = strdup(inname);
@@ -582,12 +581,12 @@ static bool GetRGBFromName(const char *inname, bool *isNone,
     bool found;
     if ( strcmp(name, "none") == 0 )
     {
-        *isNone = TRUE;
-        found = TRUE;
+        *isNone = true;
+        found = true;
     }
     else // not "None"
     {
-        found = FALSE;
+        found = false;
 
         // binary search:
         left = 0;
@@ -602,8 +601,8 @@ static bool GetRGBFromName(const char *inname, bool *isNone,
                 *r = (unsigned char)((rgbVal >> 16) & 0xFF);
                 *g = (unsigned char)((rgbVal >> 8) & 0xFF);
                 *b = (unsigned char)((rgbVal) & 0xFF);
-                *isNone = FALSE;
-                found = TRUE;
+                *isNone = false;
+                found = true;
                 break;
             }
             else if ( cmp < 0 )
@@ -671,11 +670,13 @@ wxImage wxXPMDecoder::ReadData(const char **xpm_data)
     bool hasMask;
     wxXPMColourMapData clr_data;
     wxXPMColourMap clr_tbl;
+    wxXPMColourMap::iterator it;
+    wxString maskKey;
 
     /*
      *  Read hints and initialize structures:
      */
-     
+
     count = sscanf(xpm_data[0], "%u %u %u %u",
                    &width, &height, &colors_cnt, &chars_per_pixel);
     if ( count != 4 || width * height * colors_cnt == 0 )
@@ -692,9 +693,9 @@ wxImage wxXPMDecoder::ReadData(const char **xpm_data)
     img.Create(width, height);
     if ( !img.Ok() ) return img;
 
-    img.SetMask(FALSE);
+    img.SetMask(false);
     key[chars_per_pixel] = wxT('\0');
-    hasMask = FALSE;
+    hasMask = false;
 
     /*
      *  Create colour map:
@@ -707,7 +708,8 @@ wxImage wxXPMDecoder::ReadData(const char **xpm_data)
 
         if ( clr_def == NULL )
         {
-            wxLogError(_("XPM: malformed colour definition '%s'!"), xpm_data[1+i]);
+            wxLogError(_("XPM: malformed colour definition '%s'!"),
+                       xpm_data[1+i]);
             clr_data.R = 255, clr_data.G = 0, clr_data.B = 255;
         }
         else
@@ -716,29 +718,43 @@ wxImage wxXPMDecoder::ReadData(const char **xpm_data)
             if ( !GetRGBFromName(clr_def, &isNone,
                                  &clr_data.R, &clr_data.G, &clr_data.B) )
             {
-                wxLogError(_("XPM: malformed colour definition '%s'!"), xpm_data[1+i]);
+                wxLogError(_("XPM: malformed colour definition '%s'!"),
+                           xpm_data[1+i]);
                 clr_data.R = 255, clr_data.G = 0, clr_data.B = 255;
             }
             else
             {
                 if ( isNone )
                 {
-                    img.SetMask(TRUE);
+                    img.SetMask(true);
                     img.SetMaskColour(255, 0, 255);
-                    hasMask = TRUE;
+                    hasMask = true;
                     clr_data.R = 255, clr_data.G = 0, clr_data.B = 255;
-                }
-                else
-                {
-                    if ( hasMask && clr_data.R == 255 &&
-                                    clr_data.G == 0 && clr_data.B == 255 )
-                        clr_data.B = 254;
+                    maskKey = key;
                 }
             }
         }
         clr_tbl[key] = clr_data;
     }
 
+    /*
+     *  Modify colour entries with RGB = (255,0,255) to (255,0,254) if
+     *  mask colour is present (so that existing pixels with (255,0,255)
+     *  magenta colour are not incorrectly made transparent):
+     */
+    if (hasMask)
+    {
+        for (it = clr_tbl.begin(); it != clr_tbl.end(); it++)
+        {
+            if (it->second.R == 255 && it->second.G == 0 &&
+                it->second.B == 255 &&
+                it->first != maskKey)
+            {
+                it->second.B = 254;
+            }
+        }
+    }
+
     /*
      *  Parse image data:
      */
@@ -746,7 +762,7 @@ wxImage wxXPMDecoder::ReadData(const char **xpm_data)
     unsigned char *img_data = img.GetData();
     wxXPMColourMap::iterator entry;
     wxXPMColourMap::iterator end = clr_tbl.end();
-    
+
     for (j = 0; j < height; j++)
     {
         for (i = 0; i < width; i++, img_data += 3)
@@ -758,6 +774,12 @@ wxImage wxXPMDecoder::ReadData(const char **xpm_data)
             if ( entry == end )
             {
                 wxLogError(_("XPM: Malformed pixel data!"));
+
+                // better return right now as otherwise we risk to flood the
+                // user with error messages as something seems to be seriously
+                // wrong with the file and so we could give this message for
+                // each remaining pixel if we don't bail out
+                return wxNullImage;
             }
             else
             {