use C++ wrappers around DirectFB API for easier use

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

diff --git a/src/common/gifdecod.cpp b/src/common/gifdecod.cpp
index f49f473d3baa03e1522ee55ee101b17ca7b9b621..4b3e6ddc87660a5747cff14f5c4e03d3fc38e6b3 100644 (file)
--- a/src/common/gifdecod.cpp
+++ b/src/common/gifdecod.cpp
@@ -1,5 +1,5 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        gifdecod.cpp
+// Name:        src/common/gifdecod.cpp

 // Purpose:     wxGIFDecoder, GIF reader for wxImage and wxAnimation
 // Author:      Guillermo Rodriguez Garcia <guille@iies.es>
 // Version:     3.04
 // Purpose:     wxGIFDecoder, GIF reader for wxImage and wxAnimation
 // Author:      Guillermo Rodriguez Garcia <guille@iies.es>
 // Version:     3.04


@@ -8,24 +8,19 @@
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 

-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-#pragma implementation "gifdecod.h"
-#endif
-

 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__

-#  pragma hdrstop
+    #pragma hdrstop

 #endif
 
 #endif
 

+#if wxUSE_STREAMS && wxUSE_GIF
+

 #ifndef WX_PRECOMP
 #ifndef WX_PRECOMP

-#  include "wx/defs.h"
-#  include "wx/palette.h"
+    #include "wx/palette.h"

 #endif
 
 #endif
 

-#if wxUSE_STREAMS && wxUSE_GIF
-

 #include <stdlib.h>
 #include <string.h>
 #include "wx/gifdecod.h"
 #include <stdlib.h>
 #include <string.h>
 #include "wx/gifdecod.h"


@@ -146,21 +141,18 @@ bool wxGIFDecoder::ConvertToImage(wxImage *image) const
         image->SetMask(false);
 
 #if wxUSE_PALETTE
         image->SetMask(false);
 
 #if wxUSE_PALETTE

-    if (pal)
-    {
-        unsigned char r[256];
-        unsigned char g[256];
-        unsigned char b[256];
+    unsigned char r[256];
+    unsigned char g[256];
+    unsigned char b[256];

 
 

-        for (i = 0; i < 256; i++)
-        {
-            r[i] = pal[3*i + 0];
-            g[i] = pal[3*i + 1];
-            b[i] = pal[3*i + 2];
-        }
-
-        image->SetPalette(wxPalette(256, r, g, b));
+    for (i = 0; i < 256; i++)
+    {
+        r[i] = pal[3*i + 0];
+        g[i] = pal[3*i + 1];
+        b[i] = pal[3*i + 2];

     }
     }

+
+    image->SetPalette(wxPalette(256, r, g, b));

 #endif // wxUSE_PALETTE
 
     /* copy image data */
 #endif // wxUSE_PALETTE
 
     /* copy image data */


@@ -474,6 +466,25 @@ int wxGIFDecoder::dgif(GIFImage *img, int interl, int bits)
         /* make new entry in alphabet (only if NOT just cleared) */
         if (lastcode != -1)
         {
         /* make new entry in alphabet (only if NOT just cleared) */
         if (lastcode != -1)
         {

+            // Normally, after the alphabet is full and can't grow any
+            // further (ab_free == 4096), encoder should (must?) emit CLEAR
+            // to reset it. This checks whether we really got it, otherwise
+            // the GIF is damaged.
+            if (ab_free > ab_max)
+            {
+                delete[] ab_prefix;
+                delete[] ab_tail;
+                delete[] stack;
+                return wxGIF_INVFORMAT;
+            }
+
+            // This assert seems unnecessary since the condition above
+            // eliminates the only case in which it went false. But I really
+            // don't like being forced to ask "Who in .text could have
+            // written there?!" And I wouldn't have been forced to ask if
+            // this line had already been here.
+            wxASSERT(ab_free < allocSize);
+

             ab_prefix[ab_free] = lastcode;
             ab_tail[ab_free]   = code;
             ab_free++;
             ab_prefix[ab_free] = lastcode;
             ab_tail[ab_free]   = code;
             ab_free++;


@@ -509,7 +520,7 @@ int wxGIFDecoder::dgif(GIFImage *img, int interl, int bits)
                     /* loop until a valid y coordinate has been
                     found, Or if the maximum number of passes has
                     been reached, exit the loop, and stop image
                     /* loop until a valid y coordinate has been
                     found, Or if the maximum number of passes has
                     been reached, exit the loop, and stop image

-                    decoding (At this point the image is succesfully
+                    decoding (At this point the image is successfully

                     decoded).
                     If we don't loop, but merely set y to some other
                     value, that new value might still be invalid depending
                     decoded).
                     If we don't loop, but merely set y to some other
                     value, that new value might still be invalid depending


@@ -679,6 +690,11 @@ int wxGIFDecoder::ReadGIF()
     m_screenw = buf[0] + 256 * buf[1];
     m_screenh = buf[2] + 256 * buf[3];
 
     m_screenw = buf[0] + 256 * buf[1];
     m_screenh = buf[2] + 256 * buf[3];
 

+    if ((m_screenw == 0) || (m_screenh == 0))
+    {
+        return wxGIF_INVFORMAT;
+    }
+

     /* load global color map if available */
     if ((buf[4] & 0x80) == 0x80)
     {
     /* load global color map if available */
     if ((buf[4] & 0x80) == 0x80)
     {


@@ -705,7 +721,7 @@ int wxGIFDecoder::ReadGIF()
 
     bool done = false;
 
 
     bool done = false;
 

-    while(!done)
+    while (!done)

     {
         type = (unsigned char)m_f->GetC();
 
     {
         type = (unsigned char)m_f->GetC();
 


@@ -801,7 +817,7 @@ int wxGIFDecoder::ReadGIF()
             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 (pimg->w == 0 || pimg->h == 0)
+            if ((pimg->w == 0) || (pimg->w > m_screenw) || (pimg->h == 0) || (pimg->h > m_screenh))

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


@@ -847,6 +863,11 @@ int wxGIFDecoder::ReadGIF()
 
             /* get initial code size from first byte in raster data */
             bits = (unsigned char)m_f->GetC();
 
             /* get initial code size from first byte in raster data */
             bits = (unsigned char)m_f->GetC();

+            if (bits == 0)
+            {
+                Destroy();
+                return wxGIF_INVFORMAT;
+            }

 
             /* decode image */
             int result = dgif(pimg, interl, bits);
 
             /* decode image */
             int result = dgif(pimg, interl, bits);


@@ -863,7 +884,7 @@ int wxGIFDecoder::ReadGIF()
         }
     }
 
         }
     }
 

-    if (m_nimages == 0)
+    if (m_nimages <= 0)

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