Imported from libpng-1.0.7rc1.tar

contrib/visupng/PngFile.c

@@ -228,7 +228,9 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
         if ((pbImageData = (png_byte *) malloc(ulRowBytes * (*piHeight)
                             * sizeof(png_byte))) == NULL)
         {
-            png_error(png_ptr, "Visual PNG: out of memory");
+            png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
+            *ppbImageData = pbImageData = NULL;
+            return FALSE;
         }
         *ppbImageData = pbImageData;
         
@@ -237,7 +239,10 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
         if ((ppbRowPointers = (png_bytepp) malloc((*piHeight)
                             * sizeof(png_bytep))) == NULL)
         {
-            png_error(png_ptr, "Visual PNG: out of memory");
+            png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
+            free(pbImageData);
+            *ppbImageData = pbImageData = NULL;
+            return FALSE;
         }
         
         // set the individual row-pointers to point at the correct offsets
@@ -264,7 +269,6 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
     Catch (msg)
     {
         png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
-
         *ppbImageData = pbImageData = NULL;
         
         if(ppbRowPointers)

contrib/visupng/README.txt

@@ -4,20 +4,13 @@ Microsoft Developer Studio Build File, Format Version 6.00 for VisualPng
 Copyright 2000, Willem van Schaik.  For conditions of distribution and
 use, see the copyright/license/disclaimer notice in png.h
 
-As a PNG .dll demo VisualPng is finished. More features would only hinder
-the program's objective. However, further extensions (like support for other 
-graphics formats) are in development. To get these, or for pre-compiled 
-binaries, go to "http://www.schaik.com/png/visualpng.html".
-
-------------------------------------------------------------------------
-
 Assumes that
 
    libpng DLLs and LIBs are in ..\..\msvc\win32\libpng
-   zlib DLLs and LIBs are in   ..\..\msvc\win32\zlib
-   libpng header files are in  ..\..\..\libpng
-   zlib header files are in    ..\..\..\zlib
-   the pngsuite images are in  ..\pngsuite
+   zlib DLLs and LIBs are in ..\..\msvc\win32\zlib
+   libpng header files are in ..\..\..\libpng
+   zlib header files are in ..\..\..\zlib
+   the pngsuite images are in ..\pngsuite
 
 To build:
 

contrib/visupng/cexcept.h

@@ -1,5 +1,5 @@
 /*===
-cexcept.h 1.0.0 (2000-Jun-21-Wed)
+cexcept.h 0.6.1 (2000-Apr-22-Sat)
 Adam M. Costello <amc@cs.berkeley.edu>
 
 An interface for exception-handling in ANSI C, developed jointly with
@@ -107,15 +107,14 @@ Catch (expression) statement
     confusion with the C++ keywords, which have subtly different
     semantics.
 
-    A Try/Catch statement has a syntax similar to an if/else
-    statement, except that the parenthesized expression goes after
-    the second keyword rather than the first.  As with if/else,
-    there are two clauses, each of which may be a simple statement
-    ending with a semicolon or a brace-enclosed compound statement.
-    But whereas the else clause is optional, the Catch clause is
-    required.  The expression must be a modifiable lvalue (something
-    capable of being assigned to) of the exact same type passed to
-    define_exception_type().
+    A Try/Catch statement has a syntax similar to an if/else statement,
+    except that the parenthesized expression goes after the second
+    keyword rather than the first.  As with if/else, there are two
+    clauses, each of which may be a simple statement ending with a
+    semicolon or a brace-enclosed compound statement.  But whereas
+    the else clause is optional, the Catch clause is required.  The
+    expression must be an lvalue (something capable of being assigned
+    to) of the exact same type passed to define_exception_type().
 
     If a Throw that uses the same exception context as the Try/Catch is
     executed within the Try clause (typically within a function called
@@ -136,17 +135,9 @@ Catch (expression) statement
     return, break, continue, goto, longjmp) is forbidden--the compiler
     will not complain, but bad things will happen at run-time.  Jumping
     into or out of a Catch clause is okay, and so is jumping around
-    inside a Try clause.  In many cases where one is tempted to return
-    from a Try clause, it will suffice to use Throw, and then return
-    from the Catch clause.  Another option is to set a flag variable and
-    use goto to jump to the end of the Try clause, then check the flag
-    after the Try/Catch statement.
-
-    IMPORTANT: The values of any non-volatile automatic variables
-    changed within the Try clause are undefined after an exception is
-    caught.  Therefore, variables modified inside the Try block whose
-    values are needed later outside the Try block must either use static
-    storage or be declared with the "volatile" type qualifier.
+    inside a Try clause.  Also note that the values of any non-volatile
+    automatic variables changed within the Try clause are undefined
+    after an exception is caught.
 
 
 Throw expression;
@@ -158,8 +149,8 @@ Throw expression;
     be compatible with the type passed to define_exception_type().  The
     exception must be caught, otherwise the program may crash.
 
-    Slight limitation:  If the expression is a comma-expression it must
-    be enclosed in parentheses.
+    Slight limitation:  The expression cannot be a comma-expression (but
+    no one would want to use a comma-expression here anyway).
 
 
 Try statement