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You ll remember that your project s controllers are inherited from BaseController in your project s lib/base.py file and that BaseController is inherited from pylons.controller.core.WSGIController. This means that when PylonsApp instantiates and calls one of your project s controllers, it is actually calling the WSGIController.__call__() method. The WSGIController.__call__() method proceeds as follows. First, it checks to see whether the controller has a __before__() method. If it does, it calls its _inspect_call() method that itself calls _get_method_args() to find out which arguments the method expects. The __before__() method is then called with those arguments. Next, the controller action itself needs to be called. This is done with a call to the controller s _dispatch_call() method, which finds out which action to call from the routing variables and then calls __inspect_call() itself to find out the arguments the action needs and to call the action with those arguments. Finally, after the action is called, the __call__() method checks to see whether an __after__() method exists. If it does, it will always be run on each request after the action, even if the action raises an exception or issues a redirect. Once again, __after__() is run by a call to the _inspect_call() method. If an action is not found to handle the request, the controller will raise an Action Not Found error in debug mode; otherwise, a 404 Not Found error will be returned.

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These functions assume that the programmer is already doing these checks somewhere else, and trust the programmer not to make the mistake of forgetting to do such checks Similar functions such as strcpy(), strcat(), sprintf(), and scanf() do not check for buffer overflows You should avoid using them directly in your programs You can write safe versions of these functions, as with safe_gets(), and use them instead of the standard C library functions Alternatively, some of the standard C library functions (such as strncpy(), strncat(), etc) are versions that accept buffer lengths, and could help if used properly For instance, the fgets() function can accomplish the same thing that you do with safe_gets() The fgets() function accepts a string buffer and a buffer size as arguments, and does both.

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The textSetting slot is converted in a similar manner and is not shown here. The result from the unit test is also unchanged. Tests are performed (and the results are presented) in the same way.

Once the controller action is finally called, it can perform all manner of operations using the Pylons objects that have just been described. The whole of the first two parts of the book were dedicated to some of the ways Pylons could be used, so I won t repeat them here. The action can do any of the following: Call the abort() or redirect_to() functions to halt the request Trigger an unexpected exception Return a response that requires an error document Return a function to stream content Return a Unicode object or UTF-8 encoded string as a result Let s see how Pylons handles each of these cases.

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boundary checking and null termination When using other standard C library functions, however, strings may not get correctly null terminated, and keeping track of exactly how much room is left in buffers can get tricky Also, identifying all occurrences of calls to the standard C library functions and modifying the code might require a lot of work In the following subsections, we describe some additional approaches that can be used to mitigate buffer overflow vulnerabilities While we have illustrated buffer overflow vulnerabilities in C, you might be wondering if programs in other languages, such as C++ and Java, might be vulnerable The short answer is that in any language that is complied, the compiler usually does not do (and is not capable of doing) the checking required to identify potential buffer overflows and remedy the situation.

During each call to WSGIController s _inspect_call() method when the request was being handled, the call to the method being inspected is wrapped in a try...except block. If a certain type of exception known as an HTTPException occurs, Pylons will turn that exception into a normal HTTP response. This might seem like an odd behavior, but you ll recall that Pylons provides the functions abort() and redirect_to() in pylons.controllers.util. These functions work by raising an HTTPException when they are called, so it is the code in the _inspect_call() method that is responsible for making these functions result in the correct HTTP response. Since the _inspect_call() method is also used to call the __before__ and __after__ actions if they exist, abort() and redirect_to() can also be used in those actions.

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How to generate a valid EAN13 barcode in Java ? - Stack Overflow
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java ean 13 generator

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