Don't crash on malformed HTML in wxHTML font tag handler.

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

diff --git a/src/common/imagbmp.cpp b/src/common/imagbmp.cpp
index 93288ddab1b3999b4a3bc2dc856d58629014c36c..bc6f47c85841979209d41b42b59e2d9b4d6782a0 100644 (file)
--- a/src/common/imagbmp.cpp
+++ b/src/common/imagbmp.cpp
@@ -39,6 +39,16 @@
 // For memcpy
 #include <string.h>
 
 // For memcpy
 #include <string.h>
 

+// ----------------------------------------------------------------------------
+// private functions
+// ----------------------------------------------------------------------------
+
+#if wxUSE_ICO_CUR
+
+static bool CanReadICOOrCUR(wxInputStream *stream, wxUint16 resourceType);
+
+#endif // wxUSE_ICO_CUR
+

 //-----------------------------------------------------------------------------
 // wxBMPHandler
 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
 // wxBMPHandler
 //-----------------------------------------------------------------------------


@@ -79,7 +89,7 @@ bool wxBMPHandler::SaveDib(wxImage *image,
                            bool IsMask)
 
 {
                            bool IsMask)
 
 {

-    wxCHECK_MSG( image, false, _T("invalid pointer in wxBMPHandler::SaveFile") );
+    wxCHECK_MSG( image, false, wxT("invalid pointer in wxBMPHandler::SaveFile") );

 
     if ( !image->Ok() )
     {
 
     if ( !image->Ok() )
     {


@@ -188,7 +198,7 @@ bool wxBMPHandler::SaveDib(wxImage *image,
     switch ( GetResolutionFromOptions(*image, &hres, &vres) )
     {
         default:
     switch ( GetResolutionFromOptions(*image, &hres, &vres) )
     {
         default:

-            wxFAIL_MSG( _T("unexpected image resolution units") );
+            wxFAIL_MSG( wxT("unexpected image resolution units") );

             // fall through
 
         case wxIMAGE_RESOLUTION_NONE:
             // fall through
 
         case wxIMAGE_RESOLUTION_NONE:


@@ -599,7 +609,7 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height,
     {
         if ( comp == BI_BITFIELDS )
         {
     {
         if ( comp == BI_BITFIELDS )
         {

-            int bit = 0;
+            int bit;

             stream.Read(dbuf, 4 * 3);
             rmask = wxINT32_SWAP_ON_BE(dbuf[0]);
             gmask = wxINT32_SWAP_ON_BE(dbuf[1]);
             stream.Read(dbuf, 4 * 3);
             rmask = wxINT32_SWAP_ON_BE(dbuf[0]);
             gmask = wxINT32_SWAP_ON_BE(dbuf[1]);


@@ -661,8 +671,10 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height,
     {
         // NOTE: seeking a positive amount in wxFromCurrent mode allows us to
         //       load even non-seekable streams (see wxInputStream::SeekI docs)!
     {
         // NOTE: seeking a positive amount in wxFromCurrent mode allows us to
         //       load even non-seekable streams (see wxInputStream::SeekI docs)!

-        if (stream.SeekI(bmpOffset, wxFromCurrent) == wxInvalidOffset)
-            return false;
+        const wxFileOffset pos = stream.TellI();
+        if (pos != wxInvalidOffset && bmpOffset > pos)
+            if (stream.SeekI(bmpOffset - pos, wxFromCurrent) == wxInvalidOffset)
+                return false;

         //else: icon, just carry on
     }
 
         //else: icon, just carry on
     }
 


@@ -682,6 +694,14 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height,
 
     int linesize = ((width * bpp + 31) / 32) * 4;
 
 
     int linesize = ((width * bpp + 31) / 32) * 4;
 

+    // flag indicating if we have any not fully transparent alpha values: this
+    // is used to account for the bitmaps which use 32bpp format (normally
+    // meaning that they have alpha channel) but have only zeroes in it so that
+    // without this hack they appear fully transparent -- and as this is
+    // unlikely intentional, we consider that they don't have alpha at all in
+    // this case (see #10915)
+    bool hasValidAlpha = false;
+

     /* BMPs are stored upside down */
     for ( int line = (height - 1); line >= 0; line-- )
     {
     /* BMPs are stored upside down */
     for ( int line = (height - 1); line >= 0; line-- )
     {


@@ -776,7 +796,7 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height,
                     {
                         for (int nibble = 0; nibble < 2 && column < width; nibble++)
                         {
                     {
                         for (int nibble = 0; nibble < 2 && column < width; nibble++)
                         {

-                            int index = ((aByte & (0xF0 >> nibble * 4)) >> (!nibble * 4));
+                            int index = ((aByte & (0xF0 >> (nibble * 4))) >> (!nibble * 4));

                             if ( index >= 16 )
                                 index = 15;
                             ptr[poffset] = cmap[index].r;
                             if ( index >= 16 )
                                 index = 15;
                             ptr[poffset] = cmap[index].r;


@@ -865,15 +885,15 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height,
                 stream.Read(&aWord, 2);
                 aWord = wxUINT16_SWAP_ON_BE(aWord);
                 linepos += 2;
                 stream.Read(&aWord, 2);
                 aWord = wxUINT16_SWAP_ON_BE(aWord);
                 linepos += 2;

-                /* use the masks and calculated amonut of shift
+                /* Use the masks and calculated amount of shift

                    to retrieve the color data out of the word.  Then
                    shift it left by (8 - number of bits) such that
                    the image has the proper dynamic range */
                    to retrieve the color data out of the word.  Then
                    shift it left by (8 - number of bits) such that
                    the image has the proper dynamic range */

-                temp = (unsigned char)((aWord & rmask) >> rshift << (8-rbits));
+                temp = (unsigned char)(((aWord & rmask) >> rshift) << (8-rbits));

                 ptr[poffset] = temp;
                 ptr[poffset] = temp;

-                temp = (unsigned char)((aWord & gmask) >> gshift << (8-gbits));
+                temp = (unsigned char)(((aWord & gmask) >> gshift) << (8-gbits));

                 ptr[poffset + 1] = temp;
                 ptr[poffset + 1] = temp;

-                temp = (unsigned char)((aWord & bmask) >> bshift << (8-bbits));
+                temp = (unsigned char)(((aWord & bmask) >> bshift) << (8-bbits));

                 ptr[poffset + 2] = temp;
                 column++;
             }
                 ptr[poffset + 2] = temp;
                 column++;
             }


@@ -893,6 +913,9 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height,
                 {
                     temp = (unsigned char)((aDword & amask) >> ashift);
                     alpha[line * width + column] = temp;
                 {
                     temp = (unsigned char)((aDword & amask) >> ashift);
                     alpha[line * width + column] = temp;

+
+                    if ( temp != wxALPHA_TRANSPARENT )
+                        hasValidAlpha = true;

                 }
                 column++;
             }
                 }
                 column++;
             }


@@ -908,6 +931,13 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height,
 
     image->SetMask(false);
 
 
     image->SetMask(false);
 

+    // check if we had any valid alpha values in this bitmap
+    if ( alpha && !hasValidAlpha )
+    {
+        // we didn't, so finally discard the alpha channel completely
+        image->ClearAlpha();
+    }
+

     const wxStreamError err = stream.GetLastError();
     return err == wxSTREAM_NO_ERROR || err == wxSTREAM_EOF;
 }
     const wxStreamError err = stream.GetLastError();
     return err == wxSTREAM_NO_ERROR || err == wxSTREAM_EOF;
 }


@@ -1222,7 +1252,9 @@ bool wxICOHandler::SaveFile(wxImage *image,
         if ( !cStream.Ok() )
         {
             if ( verbose )
         if ( !cStream.Ok() )
         {
             if ( verbose )

+            {

                 wxLogError(_("ICO: Error writing the image file!"));
                 wxLogError(_("ICO: Error writing the image file!"));

+            }

             return false;
         }
 #endif // 0
             return false;
         }
 #endif // 0


@@ -1316,7 +1348,7 @@ bool wxICOHandler::DoLoadFile(wxImage *image, wxInputStream& stream,
 
     stream.Read(&IconDir, sizeof(IconDir));
     wxUint16 nIcons = wxUINT16_SWAP_ON_BE(IconDir.idCount);
 
     stream.Read(&IconDir, sizeof(IconDir));
     wxUint16 nIcons = wxUINT16_SWAP_ON_BE(IconDir.idCount);

-    
+

     // nType is 1 for Icons, 2 for Cursors:
     wxUint16 nType = wxUINT16_SWAP_ON_BE(IconDir.idType);
 
     // nType is 1 for Icons, 2 for Cursors:
     wxUint16 nType = wxUINT16_SWAP_ON_BE(IconDir.idType);
 


@@ -1329,11 +1361,11 @@ bool wxICOHandler::DoLoadFile(wxImage *image, wxInputStream& stream,
 
     // remember how many bytes we read from the stream:
     wxFileOffset alreadySeeked = sizeof(IconDir);
 
     // remember how many bytes we read from the stream:
     wxFileOffset alreadySeeked = sizeof(IconDir);

-    
+

     for (unsigned int i = 0; i < nIcons; i++ )
     {
         alreadySeeked += stream.Read(pCurrentEntry, sizeof(ICONDIRENTRY)).LastRead();
     for (unsigned int i = 0; i < nIcons; i++ )
     {
         alreadySeeked += stream.Read(pCurrentEntry, sizeof(ICONDIRENTRY)).LastRead();

-        
+

         // bHeight and bColorCount are wxUint8
         if ( pCurrentEntry->bWidth >= wMax )
         {
         // bHeight and bColorCount are wxUint8
         if ( pCurrentEntry->bWidth >= wMax )
         {


@@ -1347,7 +1379,7 @@ bool wxICOHandler::DoLoadFile(wxImage *image, wxInputStream& stream,
                 colmax = pCurrentEntry->bColorCount;
             }
         }
                 colmax = pCurrentEntry->bColorCount;
             }
         }

-        
+

         pCurrentEntry++;
     }
 
         pCurrentEntry++;
     }
 


@@ -1367,13 +1399,13 @@ bool wxICOHandler::DoLoadFile(wxImage *image, wxInputStream& stream,
     {
         // seek to selected icon:
         pCurrentEntry = pIconDirEntry + iSel;
     {
         // seek to selected icon:
         pCurrentEntry = pIconDirEntry + iSel;

-        
+

         // NOTE: seeking a positive amount in wxFromCurrent mode allows us to
         //       load even non-seekable streams (see wxInputStream::SeekI docs)!
         wxFileOffset offset = wxUINT32_SWAP_ON_BE(pCurrentEntry->dwImageOffset) - alreadySeeked;
         if (offset != 0 && stream.SeekI(offset, wxFromCurrent) == wxInvalidOffset)
             return false;
         // NOTE: seeking a positive amount in wxFromCurrent mode allows us to
         //       load even non-seekable streams (see wxInputStream::SeekI docs)!
         wxFileOffset offset = wxUINT32_SWAP_ON_BE(pCurrentEntry->dwImageOffset) - alreadySeeked;
         if (offset != 0 && stream.SeekI(offset, wxFromCurrent) == wxInvalidOffset)
             return false;

-        
+

         bResult = LoadDib(image, stream, true, IsBmp);
         bool bIsCursorType = (this->GetType() == wxBITMAP_TYPE_CUR) || (this->GetType() == wxBITMAP_TYPE_ANI);
         if ( bResult && bIsCursorType && nType == 2 )
         bResult = LoadDib(image, stream, true, IsBmp);
         bool bIsCursorType = (this->GetType() == wxBITMAP_TYPE_CUR) || (this->GetType() == wxBITMAP_TYPE_ANI);
         if ( bResult && bIsCursorType && nType == 2 )


@@ -1383,9 +1415,9 @@ bool wxICOHandler::DoLoadFile(wxImage *image, wxInputStream& stream,
             image->SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y, wxUINT16_SWAP_ON_BE(pCurrentEntry->wBitCount));
         }
     }
             image->SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y, wxUINT16_SWAP_ON_BE(pCurrentEntry->wBitCount));
         }
     }

-    
+

     delete [] pIconDirEntry;
     delete [] pIconDirEntry;

-    
+

     return bResult;
 }
 
     return bResult;
 }
 


@@ -1396,18 +1428,14 @@ int wxICOHandler::DoGetImageCount(wxInputStream& stream)
     if (stream.Read(&IconDir, sizeof(IconDir)).LastRead() != sizeof(IconDir))
              // it's ok to modify the stream position here
         return 0;
     if (stream.Read(&IconDir, sizeof(IconDir)).LastRead() != sizeof(IconDir))
              // it's ok to modify the stream position here
         return 0;

-    
+

     return (int)wxUINT16_SWAP_ON_BE(IconDir.idCount);
 }
 
 bool wxICOHandler::DoCanRead(wxInputStream& stream)
 {
     return (int)wxUINT16_SWAP_ON_BE(IconDir.idCount);
 }
 
 bool wxICOHandler::DoCanRead(wxInputStream& stream)
 {

-    unsigned char hdr[4];
-    if ( !stream.Read(hdr, WXSIZEOF(hdr)) )     // it's ok to modify the stream position here
-        return false;
+    return CanReadICOOrCUR(&stream, 1 /*for identifying an icon*/);

 
 

-    // hdr[2] is one for an icon and two for a cursor
-    return hdr[0] == '\0' && hdr[1] == '\0' && hdr[2] == '\1' && hdr[3] == '\0';

 }
 
 #endif // wxUSE_STREAMS
 }
 
 #endif // wxUSE_STREAMS


@@ -1423,12 +1451,7 @@ IMPLEMENT_DYNAMIC_CLASS(wxCURHandler, wxICOHandler)
 
 bool wxCURHandler::DoCanRead(wxInputStream& stream)
 {
 
 bool wxCURHandler::DoCanRead(wxInputStream& stream)
 {

-    unsigned char hdr[4];
-    if ( !stream.Read(hdr, WXSIZEOF(hdr)) )     // it's ok to modify the stream position here
-        return false;
-
-    // hdr[2] is one for an icon and two for a cursor
-    return hdr[0] == '\0' && hdr[1] == '\0' && hdr[2] == '\2' && hdr[3] == '\0';
+    return CanReadICOOrCUR(&stream, 2 /*for identifying a cursor*/);

 }
 
 #endif // wxUSE_STREAMS
 }
 
 #endif // wxUSE_STREAMS


@@ -1467,6 +1490,19 @@ int wxANIHandler::DoGetImageCount(wxInputStream& stream)
     return decoder.GetFrameCount();
 }
 
     return decoder.GetFrameCount();
 }
 

+static bool CanReadICOOrCUR(wxInputStream *stream, wxUint16 resourceType)
+{
+    ICONDIR iconDir;
+    if ( !stream->Read(&iconDir, sizeof(iconDir)) )     // it's ok to modify the stream position here
+    {
+        return false;
+    }
+
+    return !iconDir.idReserved // reserved, must be 0
+        && wxUINT16_SWAP_ON_BE(iconDir.idType) == resourceType // either 1 or 2
+        && iconDir.idCount; // must contain at least one image
+}
+

 #endif // wxUSE_STREAMS
 
 #endif // wxUSE_ICO_CUR
 #endif // wxUSE_STREAMS
 
 #endif // wxUSE_ICO_CUR