fixed some crashes

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

diff --git a/src/common/gifdecod.cpp b/src/common/gifdecod.cpp
index c746a8574f276eda5a968ca2a562e1cbc76b3a08..c08bf1fdf62a7f4810aff262100a143647ca4277 100644 (file)
--- a/src/common/gifdecod.cpp
+++ b/src/common/gifdecod.cpp
@@ -36,7 +36,7 @@
 
 wxGIFDecoder::wxGIFDecoder(wxInputStream *s, bool anim)
 {
-    m_f = s;
+    m_f    = s;
     m_anim = anim;
 
     m_background = -1;
@@ -69,6 +69,12 @@ void wxGIFDecoder::Destroy()
         delete pimg;
         pimg = paux;
     }
+
+    m_pimage  = NULL;
+    m_pfirst  = NULL;
+    m_plast   = NULL;
+    m_image   = 0;
+    m_nimages = 0;
 }
 
 
@@ -120,6 +126,25 @@ bool wxGIFDecoder::ConvertToImage(wxImage *image) const
     else
         image->SetMask(FALSE);
 
+    // Set the palette
+    // Palette creation not yet implemented on wxGTK
+#ifndef __WXGTK__
+    if (pal)
+    {
+        unsigned char* r = new unsigned char[256];
+        unsigned char* g = new unsigned char[256];
+        unsigned char* b = new unsigned char[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));
+        delete[] r; delete[] g; delete[] b;
+    }
+#endif
+
     /* copy image data */
     for (i = 0; i < (GetWidth() * GetHeight()); i++, src++)
     {
@@ -311,10 +336,15 @@ int wxGIFDecoder::getcode(int bits, int ab_fin)
 //
 int wxGIFDecoder::dgif(GIFImage *img, int interl, int bits)
 {
+#ifdef __WXMAC__
+    int *ab_prefix = new int[4096];        /* alphabet (prefixes) */
+    int *ab_tail = new int[4096];          /* alphabet (tails) */
+    int *stack = new int[4096];            /* decompression stack */
+#else
     int ab_prefix[4096];        /* alphabet (prefixes) */
     int ab_tail[4096];          /* alphabet (tails) */
     int stack[4096];            /* decompression stack */
-
+#endif
     int ab_clr;                 /* clear code */
     int ab_fin;                 /* end of info code */
     int ab_bits;                /* actual symbol width, in bits */
@@ -438,6 +468,11 @@ int wxGIFDecoder::dgif(GIFImage *img, int interl, int bits)
     }
     while (code != ab_fin);
 
+#ifdef __WXMAC__
+    delete [] ab_prefix ;       
+    delete [] ab_tail ;       
+    delete [] stack ;       
+#endif
     return 0;
 }
 
@@ -470,7 +505,7 @@ int wxGIFDecoder::ReadGIF()
     int           ncolors, bits, interl, transparent, disposal, i;
     long          size;
     long          delay;
-    unsigned char type;
+    unsigned char type = 0;
     unsigned char pal[768];
     unsigned char buf[16];
     GIFImage      **ppimg, *pimg, *pprev;
@@ -643,7 +678,7 @@ int wxGIFDecoder::ReadGIF()
             if ((buf[8] & 0x80) == 0x80)
             {
                 ncolors = 2 << (buf[8] & 0x07);
-                m_f->Read(pal, 3 * ncolors);
+                m_f->SeekI(3 * ncolors, wxFromCurrent);
             }
 
             /* initial code size */
@@ -655,7 +690,7 @@ int wxGIFDecoder::ReadGIF()
                 m_f->SeekI(i, wxFromCurrent);
             }
         }
-        else if (type != 0x3B)
+        else if ((type != 0x3B) && (type != 00)) /* testing */
         {
             /* images are OK, but couldn't read to the end of the stream */
             return wxGIF_TRUNCATED;