fix Purpose comment

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

diff --git a/src/common/imagtga.cpp b/src/common/imagtga.cpp
index bf99b1af4cff216455598bc86f3a7e7a10fd99c3..fc7373822bb0090ac06b3751027ebeb3d70538d2 100644 (file)
--- a/src/common/imagtga.cpp
+++ b/src/common/imagtga.cpp
@@ -30,6 +30,7 @@
 
 #include "wx/imagtga.h"
 #include "wx/log.h"
+#include "wx/scopeguard.h"
 
 // ----------------------------------------------------------------------------
 // constants
@@ -38,9 +39,10 @@
 // TGA error codes.
 enum
 {
-    wxTGA_OK = 0,
-    wxTGA_INVFORMAT = 1,
-    wxTGA_MEMERR = 2
+    wxTGA_OK,
+    wxTGA_INVFORMAT,
+    wxTGA_MEMERR,
+    wxTGA_IOERR
 };
 
 // TGA header bytes.
@@ -99,8 +101,9 @@ void FlipTGA(unsigned char* imageData, int width, int height, short pixelSize)
     }
 }
 
+// return wxTGA_OK or wxTGA_IOERR
 static
-void DecodeRLE(unsigned char* imageData, unsigned long imageSize,
+int DecodeRLE(unsigned char* imageData, unsigned long imageSize,
                short pixelSize, wxInputStream& stream)
 {
     unsigned long index = 0;
@@ -110,7 +113,11 @@ void DecodeRLE(unsigned char* imageData, unsigned long imageSize,
 
     while (index < imageSize)
     {
-        current = stream.GetC();
+        int ch = stream.GetC();
+        if ( ch == wxEOF )
+            return wxTGA_IOERR;
+
+        current = ch;
 
         // RLE packet.
         if ( current & 0x80 )
@@ -125,7 +132,8 @@ void DecodeRLE(unsigned char* imageData, unsigned long imageSize,
             index += current * pixelSize;
 
             // Repeat the pixel length times.
-            stream.Read(buf, pixelSize);
+            if ( !stream.Read(buf, pixelSize) )
+                return wxTGA_IOERR;
 
             for (unsigned int i = 0; i < length; i++)
             {
@@ -144,11 +152,14 @@ void DecodeRLE(unsigned char* imageData, unsigned long imageSize,
             index += length;
 
             // Write the next length pixels directly to the image data.
-            stream.Read(imageData, length);
+            if ( !stream.Read(imageData, length) )
+                return wxTGA_IOERR;
 
             imageData += length;
         }
     }
+
+    return wxTGA_OK;
 }
 
 static
@@ -187,6 +198,8 @@ int ReadTGA(wxImage* image, wxInputStream& stream)
         return wxTGA_MEMERR;
     }
 
+    wxON_BLOCK_EXIT1(free, imageData);
+
     unsigned char *dst = image->GetData();
 
     unsigned char* alpha = NULL;
@@ -218,13 +231,10 @@ int ReadTGA(wxImage* image, wxInputStream& stream)
             b[i] = buf[0];
         }
 
-        #if wxUSE_PALETTE
-
+#if wxUSE_PALETTE
         // Set the palette of the image.
-
         image->SetPalette(wxPalette(paletteLength, r, g, b));
-
-        #endif // wxUSE_PALETTE
+#endif // wxUSE_PALETTE
 
         delete[] r;
         delete[] g;
@@ -235,6 +245,7 @@ int ReadTGA(wxImage* image, wxInputStream& stream)
 
     switch (imageType)
     {
+#if wxUSE_PALETTE
         // Raw indexed.
 
         case 1:
@@ -296,6 +307,7 @@ int ReadTGA(wxImage* image, wxInputStream& stream)
             }
         }
         break;
+#endif // wxUSE_PALETTE
 
         // Raw RGB.
 
@@ -428,6 +440,7 @@ int ReadTGA(wxImage* image, wxInputStream& stream)
         }
         break;
 
+#if wxUSE_PALETTE
         // RLE indexed.
 
         case 9:
@@ -439,7 +452,9 @@ int ReadTGA(wxImage* image, wxInputStream& stream)
 
             // Decode the RLE data.
 
-            DecodeRLE(imageData, imageSize, pixelSize, stream);
+            int rc =  DecodeRLE(imageData, imageSize, pixelSize, stream);
+            if ( rc != wxTGA_OK )
+                return rc;
 
             // If orientation == 0, then the image is stored upside down.
             // We need to store it right side up.
@@ -489,6 +504,7 @@ int ReadTGA(wxImage* image, wxInputStream& stream)
             }
         }
         break;
+#endif // wxUSE_PALETTE
 
         // RLE RGB.
 
@@ -496,7 +512,9 @@ int ReadTGA(wxImage* image, wxInputStream& stream)
         {
             // Decode the RLE data.
 
-            DecodeRLE(imageData, imageSize, pixelSize, stream);
+            int rc = DecodeRLE(imageData, imageSize, pixelSize, stream);
+            if ( rc != wxTGA_OK )
+                return rc;
 
             // If orientation == 0, then the image is stored upside down.
             // We need to store it right side up.
@@ -574,7 +592,9 @@ int ReadTGA(wxImage* image, wxInputStream& stream)
         {
             // Decode the RLE data.
 
-            DecodeRLE(imageData, imageSize, pixelSize, stream);
+            int rc = DecodeRLE(imageData, imageSize, pixelSize, stream);
+            if ( rc != wxTGA_OK )
+                return rc;
 
             // If orientation == 0, then the image is stored upside down.
             // We need to store it right side up.
@@ -625,8 +645,6 @@ int ReadTGA(wxImage* image, wxInputStream& stream)
             return wxTGA_INVFORMAT;
     }
 
-    free(imageData);
-
     return wxTGA_OK;
 }
 
@@ -672,6 +690,10 @@ bool wxTGAHandler::LoadFile(wxImage* image,
                     wxLogError(wxT("TGA: couldn't allocate memory."));
                     break;
 
+                case wxTGA_IOERR:
+                    wxLogError(wxT("TGA: couldn't read image data."));
+                    break;
+
                 default:
                     wxLogError(wxT("TGA: unknown error!"));
             }