X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/55a35cb0c14f75a05624182d08abd97876f7500f..8cbc59fe84f046685b873cf58f6c56debe59de1c:/src/common/imagbmp.cpp?ds=sidebyside

diff --git a/src/common/imagbmp.cpp b/src/common/imagbmp.cpp
index fc67b77313..6f3a298d18 100644
--- a/src/common/imagbmp.cpp
+++ b/src/common/imagbmp.cpp
@@ -33,6 +33,7 @@
 #include "wx/filefn.h"
 #include "wx/wfstream.h"
 #include "wx/quantize.h"
+#include "wx/scopeguard.h"
 #include "wx/anidecod.h"
 
 // For memcpy
@@ -179,9 +180,8 @@ bool wxBMPHandler::SaveDib(wxImage *image,
 
     // get the resolution from the image options  or fall back to 72dpi standard
     // for the BMP format if not specified
-    wxUint32 hres = image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONX),
-             vres = image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONY);
-    switch ( image->GetOptionInt(wxIMAGE_OPTION_RESOLUTION) )
+    int hres, vres;
+    switch ( GetResolutionFromOptions(*image, &hres, &vres) )
     {
         default:
             wxFAIL_MSG( _T("unexpected image resolution units") );
@@ -194,8 +194,8 @@ bool wxBMPHandler::SaveDib(wxImage *image,
 
         case wxIMAGE_RESOLUTION_INCHES:
             // convert resolution in inches to resolution in centimeters
-            hres = (wxUint32)(100*mm2inches*hres);
-            vres = (wxUint32)(100*mm2inches*vres);
+            hres = (int)(10*mm2inches*hres);
+            vres = (int)(10*mm2inches*vres);
             // fall through to convert it to resolution in meters
 
         case wxIMAGE_RESOLUTION_CM:
@@ -469,10 +469,12 @@ bool wxBMPHandler::SaveDib(wxImage *image,
 }
 
 
-typedef struct
+struct BMPPalette
 {
+    static void Free(BMPPalette* pal) { delete [] pal; }
+
     unsigned char r, g, b;
-}  _cmap;
+};
 
 bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height,
                              int bpp, int ncolors, int comp,
@@ -481,18 +483,18 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height,
 {
     wxInt32         aDword, rmask = 0, gmask = 0, bmask = 0, amask = 0;
     int             rshift = 0, gshift = 0, bshift = 0, ashift = 0;
-    int             rbits = 0, gbits = 0, bbits = 0, abits = 0;
+    int             rbits = 0, gbits = 0, bbits = 0;
     wxInt32         dbuf[4];
     wxInt8          bbuf[4];
     wxUint8         aByte;
     wxUint16        aWord;
 
     // allocate space for palette if needed:
-    _cmap *cmap;
+    BMPPalette *cmap;
 
     if ( bpp < 16 )
     {
-        cmap = new _cmap[ncolors];
+        cmap = new BMPPalette[ncolors];
         if ( !cmap )
         {
             if (verbose)
@@ -500,8 +502,12 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height,
             return false;
         }
     }
-    else
+    else // no palette
+    {
         cmap = NULL;
+    }
+
+    wxON_BLOCK_EXIT1(&BMPPalette::Free, cmap);
 
     // destroy existing here instead of:
     image->Destroy();
@@ -513,7 +519,6 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height,
     {
         if ( verbose )
             wxLogError( _("BMP: Couldn't allocate memory.") );
-        delete[] cmap;
         return false;
     }
 
@@ -527,7 +532,6 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height,
         {
             if ( verbose )
                 wxLogError(_("BMP: Couldn't allocate memory."));
-            delete[] cmap;
             return false;
         }
     }
@@ -626,7 +630,6 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height,
             rshift = 16;
             gshift = 8;
             bshift = 0;
-            abits = 8;
             rbits = 8;
             gbits = 8;
             bbits = 8;
@@ -637,7 +640,11 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height,
      * Reading the image data
      */
     if ( IsBmp )
-        stream.SeekI(bmpOffset); // else icon, just carry on
+    {
+        if (stream.SeekI(bmpOffset) == wxInvalidOffset)
+            return false;
+        //else: icon, just carry on
+    }
 
     unsigned char *data = ptr;
 
@@ -879,8 +886,6 @@ bool wxBMPHandler::DoLoadDib(wxImage * image, int width, int height,
         }
     }
 
-    delete[] cmap;
-
     image->SetMask(false);
 
     const wxStreamError err = stream.GetLastError();
@@ -1254,7 +1259,8 @@ bool wxICOHandler::SaveFile(wxImage *image,
 bool wxICOHandler::LoadFile(wxImage *image, wxInputStream& stream,
                             bool verbose, int index)
 {
-    stream.SeekI(0);
+    if (stream.SeekI(0) == wxInvalidOffset)
+        return false;
     return DoLoadFile(image, stream, verbose, index);
 }
 
@@ -1314,7 +1320,8 @@ bool wxICOHandler::DoLoadFile(wxImage *image, wxInputStream& stream,
     {
         // seek to selected icon:
         pCurrentEntry = pIconDirEntry + iSel;
-        stream.SeekI(iPos + wxUINT32_SWAP_ON_BE(pCurrentEntry->dwImageOffset), wxFromStart);
+        if (stream.SeekI(iPos + wxUINT32_SWAP_ON_BE(pCurrentEntry->dwImageOffset), wxFromStart) == 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 )
@@ -1332,16 +1339,20 @@ int wxICOHandler::GetImageCount(wxInputStream& stream)
 {
     ICONDIR IconDir;
     wxFileOffset iPos = stream.TellI();
-    stream.SeekI(0);
-    stream.Read(&IconDir, sizeof(IconDir));
+    if (stream.SeekI(0) == wxInvalidOffset)
+        return 0;
+    if (stream.Read(&IconDir, sizeof(IconDir)).LastRead() != sizeof(IconDir))
+        return 0;
     wxUint16 nIcons = wxUINT16_SWAP_ON_BE(IconDir.idCount);
-    stream.SeekI(iPos);
+    if (stream.SeekI(iPos) == wxInvalidOffset)
+        return 0;
     return (int)nIcons;
 }
 
 bool wxICOHandler::DoCanRead(wxInputStream& stream)
 {
-    stream.SeekI(0);
+    if (stream.SeekI(0) == wxInvalidOffset)
+        return false;
     unsigned char hdr[4];
     if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
         return false;
@@ -1363,7 +1374,8 @@ IMPLEMENT_DYNAMIC_CLASS(wxCURHandler, wxICOHandler)
 
 bool wxCURHandler::DoCanRead(wxInputStream& stream)
 {
-    stream.SeekI(0);
+    if (stream.SeekI(0) == wxInvalidOffset)
+        return false;
     unsigned char hdr[4];
     if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
         return false;