X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/7d7b3f69f2b8ab29b3cb8ceb6e2923018cf96562..6f3f38980f10a935f3b47dbf0d3b4643e96a4be2:/src/common/imagpng.cpp

diff --git a/src/common/imagpng.cpp b/src/common/imagpng.cpp
index 474221ae11..32845b9afe 100644
--- a/src/common/imagpng.cpp
+++ b/src/common/imagpng.cpp
@@ -25,6 +25,7 @@
 #if wxUSE_IMAGE && wxUSE_LIBPNG
 
 #include "wx/imagpng.h"
+#include "wx/versioninfo.h"
 
 #ifndef WX_PRECOMP
     #include "wx/log.h"
@@ -165,7 +166,9 @@ PNGLINKAGEMODE wx_png_warning(png_structp png_ptr, png_const_charp message)
 {
     wxPNGInfoStruct *info = png_ptr ? WX_PNG_INFO(png_ptr) : NULL;
     if ( !info || info->verbose )
+    {
         wxLogWarning( wxString::FromAscii(message) );
+    }
 }
 
 // from pngerror.c
@@ -302,7 +305,7 @@ bool wxPNGHandler::DoCanRead( wxInputStream& stream )
 {
     unsigned char hdr[4];
 
-    if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
+    if ( !stream.Read(hdr, WXSIZEOF(hdr)) )     // it's ok to modify the stream position here
         return false;
 
     return memcmp(hdr, "\211PNG", WXSIZEOF(hdr)) == 0;
@@ -385,7 +388,7 @@ void CopyDataFromPNG(wxImage *image,
 
                         // must be opaque then as otherwise we shouldn't be
                         // using the mask at all
-                        wxASSERT_MSG( IsOpaque(a), _T("logic error") );
+                        wxASSERT_MSG( IsOpaque(a), wxT("logic error") );
 
                         // fall through
 
@@ -453,7 +456,7 @@ void CopyDataFromPNG(wxImage *image,
                         {
                             // must be opaque then as otherwise we shouldn't be
                             // using the mask at all
-                            wxASSERT_MSG( IsOpaque(a), _T("logic error") );
+                            wxASSERT_MSG( IsOpaque(a), wxT("logic error") );
 
                             // if we couldn't find a unique colour for the
                             // mask, we can have real pixels with the same
@@ -558,18 +561,16 @@ wxPNGHandler::LoadFile(wxImage *image,
     if (!image->Ok())
         goto error;
 
-    lines = (unsigned char **)malloc( (size_t)(height * sizeof(unsigned char *)) );
+    // initialize all line pointers to NULL to ensure that they can be safely
+    // free()d if an error occurs before all of them could be allocated
+    lines = (unsigned char **)calloc(height, sizeof(unsigned char *));
     if ( !lines )
         goto error;
 
     for (i = 0; i < height; i++)
     {
         if ((lines[i] = (unsigned char *)malloc( (size_t)(width * (sizeof(unsigned char) * 4)))) == NULL)
-        {
-            for ( unsigned int n = 0; n < i; n++ )
-                free( lines[n] );
             goto error;
-        }
     }
 
     png_read_image( png_ptr, lines );
@@ -610,7 +611,9 @@ wxPNGHandler::LoadFile(wxImage *image,
 
 error:
     if (verbose)
+    {
        wxLogError(_("Couldn't load a PNG image - file is corrupted or not enough memory."));
+    }
 
     if ( image->Ok() )
     {
@@ -659,7 +662,9 @@ bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbos
     if (!png_ptr)
     {
         if (verbose)
+        {
            wxLogError(_("Couldn't save PNG image."));
+        }
         return false;
     }
 
@@ -668,7 +673,9 @@ bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbos
     {
         png_destroy_write_struct( &png_ptr, (png_infopp)NULL );
         if (verbose)
+        {
            wxLogError(_("Couldn't save PNG image."));
+        }
         return false;
     }
 
@@ -676,7 +683,9 @@ bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbos
     {
         png_destroy_write_struct( &png_ptr, (png_infopp)NULL );
         if (verbose)
+        {
            wxLogError(_("Couldn't save PNG image."));
+        }
         return false;
     }
 
@@ -691,9 +700,6 @@ bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbos
                             ? image->GetOptionInt(wxIMAGE_OPTION_PNG_BITDEPTH)
                             : 8;
 
-    wxASSERT_MSG( iBitDepth == 8 || iBitDepth == 16,
-                    _T("PNG bit depth must be 8 or 16") );
-
     bool bHasAlpha = image->HasAlpha();
     bool bHasMask = image->HasMask();
     bool bUseAlpha = bHasAlpha || bHasMask;
@@ -776,7 +782,7 @@ bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbos
             break;
 
         default:
-            wxFAIL_MSG( _T("unsupported image resolution units") );
+            wxFAIL_MSG( wxT("unsupported image resolution units") );
     }
 
     if ( resX && resY )
@@ -823,7 +829,7 @@ bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbos
             switch ( iColorType )
             {
                 default:
-                    wxFAIL_MSG( _T("unknown wxPNG_TYPE_XXX") );
+                    wxFAIL_MSG( wxT("unknown wxPNG_TYPE_XXX") );
                     // fall through
 
                 case wxPNG_TYPE_COLOUR:
@@ -897,4 +903,18 @@ bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbos
 
 #endif  // wxUSE_STREAMS
 
+/*static*/ wxVersionInfo wxPNGHandler::GetLibraryVersionInfo()
+{
+    // The version string seems to always have a leading space and a trailing
+    // new line, get rid of them both.
+    wxString str = png_get_header_version(NULL) + 1;
+    str.Replace("\n", "");
+
+    return wxVersionInfo("libpng",
+                         PNG_LIBPNG_VER_MAJOR,
+                         PNG_LIBPNG_VER_MINOR,
+                         PNG_LIBPNG_VER_RELEASE,
+                         str);
+}
+
 #endif  // wxUSE_LIBPNG