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

diff --git a/src/common/gifdecod.cpp b/src/common/gifdecod.cpp
index 569b3e77ae653b6663bc6f92b43ea98c14bf0685..0a2dad27244465b6811980ccb722e872c247b656 100644 (file)
--- a/src/common/gifdecod.cpp
+++ b/src/common/gifdecod.cpp
@@ -191,7 +191,7 @@ bool wxGIFDecoder::ConvertToImage(unsigned int frame, wxImage *image) const
 
 // Get data for current frame
 
 
 // Get data for current frame
 

-wxSize wxGIFDecoder::GetFrameSize(unsigned int frame) const 
+wxSize wxGIFDecoder::GetFrameSize(unsigned int frame) const

 {
     return wxSize(GetFrame(frame)->w, GetFrame(frame)->h);
 }
 {
     return wxSize(GetFrame(frame)->w, GetFrame(frame)->h);
 }


@@ -580,7 +580,8 @@ bool wxGIFDecoder::CanRead(wxInputStream &stream) const
     if ( !stream.Read(buf, WXSIZEOF(buf)) )
         return false;
 
     if ( !stream.Read(buf, WXSIZEOF(buf)) )
         return false;
 

-    stream.SeekI(-(wxFileOffset)WXSIZEOF(buf), wxFromCurrent);
+    if (stream.SeekI(-(wxFileOffset)WXSIZEOF(buf), wxFromCurrent) == wxInvalidOffset)
+        return false;       // this happens e.g. for non-seekable streams

 
     return memcmp(buf, "GIF", WXSIZEOF(buf)) == 0;
 }
 
     return memcmp(buf, "GIF", WXSIZEOF(buf)) == 0;
 }


@@ -598,7 +599,7 @@ bool wxGIFDecoder::CanRead(wxInputStream &stream) const
 wxGIFErrorCode wxGIFDecoder::LoadGIF(wxInputStream& stream)
 {
     unsigned int  global_ncolors = 0;
 wxGIFErrorCode wxGIFDecoder::LoadGIF(wxInputStream& stream)
 {
     unsigned int  global_ncolors = 0;

-    int           bits, interl, transparent, i;
+    int           bits, interl, i;

     wxAnimationDisposal disposal;
     long          size;
     long          delay;
     wxAnimationDisposal disposal;
     long          size;
     long          delay;


@@ -660,7 +661,7 @@ wxGIFErrorCode wxGIFDecoder::LoadGIF(wxInputStream& stream)
     }
 
     // transparent colour, disposal method and delay default to unused
     }
 
     // transparent colour, disposal method and delay default to unused

-    transparent = -1;
+    int transparent = -1;

     disposal = wxANIM_UNSPECIFIED;
     delay = -1;
 
     disposal = wxANIM_UNSPECIFIED;
     delay = -1;
 


@@ -710,8 +711,7 @@ wxGIFErrorCode wxGIFDecoder::LoadGIF(wxInputStream& stream)
                 delay = 10 * (buf[2] + 256 * buf[3]);
 
                 // read transparent colour index, if used
                 delay = 10 * (buf[2] + 256 * buf[3]);
 
                 // read transparent colour index, if used

-                if (buf[1] & 0x01)
-                    transparent = buf[4];
+                transparent = buf[1] & 0x01 ? buf[4] : -1;

 
                 // read disposal method
                 disposal = (wxAnimationDisposal)(((buf[1] & 0x1C) >> 2) - 1);
 
                 // read disposal method
                 disposal = (wxAnimationDisposal)(((buf[1] & 0x1C) >> 2) - 1);


@@ -721,12 +721,12 @@ wxGIFErrorCode wxGIFDecoder::LoadGIF(wxInputStream& stream)
             {
                 while ((i = (unsigned char)stream.GetC()) != 0)
                 {
             {
                 while ((i = (unsigned char)stream.GetC()) != 0)
                 {

-                    if (stream.Eof() || (stream.LastRead() == 0))
+                    if (stream.Eof() || (stream.LastRead() == 0) ||
+                        stream.SeekI(i, wxFromCurrent) == wxInvalidOffset)

                     {
                         done = true;
                         break;
                     }
                     {
                         done = true;
                         break;
                     }

-                    stream.SeekI(i, wxFromCurrent);

                 }
             }
         }
                 }
             }
         }


@@ -757,8 +757,8 @@ wxGIFErrorCode wxGIFDecoder::LoadGIF(wxInputStream& stream)
             pimg->w = buf[4] + 256 * buf[5];
             pimg->h = buf[6] + 256 * buf[7];
 
             pimg->w = buf[4] + 256 * buf[5];
             pimg->h = buf[6] + 256 * buf[7];
 

-            if ( anim && ((pimg->w == 0) || (pimg->w > (unsigned int)m_szAnimation.GetWidth()) || 
-                            (pimg->h == 0) || (pimg->h > (unsigned int)m_szAnimation.GetHeight())) )
+            if ( anim && ((pimg->w == 0) || (pimg->w > (unsigned int)m_szAnimation.GetWidth()) ||
+                  (pimg->h == 0) || (pimg->h > (unsigned int)m_szAnimation.GetHeight())) )

                 return wxGIF_INVFORMAT;
 
             interl = ((buf[8] & 0x40)? 1 : 0);
                 return wxGIF_INVFORMAT;
 
             interl = ((buf[8] & 0x40)? 1 : 0);


@@ -835,12 +835,12 @@ wxGIFErrorCode wxGIFDecoder::LoadGIF(wxInputStream& stream)
             // skip all data
             while ((i = (unsigned char)stream.GetC()) != 0)
             {
             // skip all data
             while ((i = (unsigned char)stream.GetC()) != 0)
             {

-                if (stream.Eof() || (stream.LastRead() == 0))
+                if (stream.Eof() || (stream.LastRead() == 0) ||
+                    stream.SeekI(i, wxFromCurrent) == wxInvalidOffset)

                 {
                     Destroy();
                     return wxGIF_INVFORMAT;
                 }
                 {
                     Destroy();
                     return wxGIF_INVFORMAT;
                 }

-                stream.SeekI(i, wxFromCurrent);

             }
         }
         else if (type == 0x2C)
             }
         }
         else if (type == 0x2C)


@@ -859,7 +859,11 @@ wxGIFErrorCode wxGIFDecoder::LoadGIF(wxInputStream& stream)
             {
                 unsigned int local_ncolors = 2 << (buf[8] & 0x07);
                 wxFileOffset numBytes = 3 * local_ncolors;
             {
                 unsigned int local_ncolors = 2 << (buf[8] & 0x07);
                 wxFileOffset numBytes = 3 * local_ncolors;

-                stream.SeekI(numBytes, wxFromCurrent);
+                if (stream.SeekI(numBytes, wxFromCurrent) == wxInvalidOffset)
+                {
+                    Destroy();
+                    return wxGIF_INVFORMAT;
+                }

             }
 
             // initial code size
             }
 
             // initial code size


@@ -873,12 +877,12 @@ wxGIFErrorCode wxGIFDecoder::LoadGIF(wxInputStream& stream)
             // skip all data
             while ((i = (unsigned char)stream.GetC()) != 0)
             {
             // skip all data
             while ((i = (unsigned char)stream.GetC()) != 0)
             {

-                if (stream.Eof() || (stream.LastRead() == 0))
+                if (stream.Eof() || (stream.LastRead() == 0) ||
+                    stream.SeekI(i, wxFromCurrent) == wxInvalidOffset)

                 {
                     Destroy();
                     return wxGIF_INVFORMAT;
                 }
                 {
                     Destroy();
                     return wxGIF_INVFORMAT;
                 }

-                stream.SeekI(i, wxFromCurrent);

             }
         }
         else if ((type != 0x3B) && (type != 00)) // testing
             }
         }
         else if ((type != 0x3B) && (type != 00)) // testing