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Consider the small example C program that follows: void get_input() { char buf[1024]; gets(buf); } void main(int argc, char *argv[]) { get_input(); } This program is vulnerable to a buffer overflow attack. It has two functions: a main() function and a get_input() function. When the C program starts executing, it starts with the main() function. The main() function calls get_input(). The get_input() function is called to accept input from the user. The get_input() function has a variable called buf, which is simply an array of characters. It can be used to store up to 1,024 characters1 (bytes of input) from the user. The next line in the get_input() function is a call to the gets() C library function. The gets() function asks the operating system to start accepting input from the user until the user types a carriage return. Then, the gets() function stores that input in the buf variable. What makes this program vulnerable to a buffer overflow attack is that while most users may not enter input that exceeds 1,024 characters, a malicious user might enter more than 1,024 characters before typing the carriage return. The problem is that the buf variable has only been allocated 1,024 bytes of memory. In a perfect world, extra input might be automatically ignored by gets(), or gets() might return with an error. In the real world, unfortunately, because of the way that the gets() function is implemented in the standard C programming library, something much worse can happen. Let s look at a program whose functionality is a bit more significant to give an example of why such an error could be more serious.



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Thus, you have to determine which method you ll use to enforce the business rules application logic or integrity constraints based on the needs of your application In any case, integrity constraints are so fundamental to the operation of relational databases that you are bound to use them in your database By default, Oracle allows null values in all columns If null values are not permissible for some columns in a table, you need to use the NOT NULL constraint when specifying the column Note that you can impose the database constraints on tables either at table creation time or later by using the ALTER TABLE command Obviously, however, if you already have null columns or duplicate data, it is not possible to alter the table to impose a NOT NULL or unique constraint on the table You can enforce several types of constraints in an Oracle table.





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For simplicity s sake, you can divide the constraints into five different types: Primary key constraints NOT NULL constraints Check constraints Unique constraints Referential integrity constraints I discuss each of these types of constraints in the following sections In addition, I also present a brief discussion of integrity constraint states..

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If you need to resize a video, be sure to maintain the video s aspect ratio. When digital video is created for your television, it is created at a 4:3 ratio. This ratio is called the video s aspect ratio and fits most computer monitors. Other common examples would be widescreen television video, which has an aspect ratio of 6:5, and HDTV, which uses a 16:9 aspect ratio. For example, the video you are encoding has a physical size of 320 pixels wide by 240 pixels high. The width is easily divisible by 4, and the height is divisible by 3. By maintaining the aspect ratio, you avoid introducing artifacts (blocky shapes and other nastiness) into the video when it is resized. While we are on the subject of resizing video, never increase the physical size of the video. If you need to change the size, use this area to reduce, not increase, the width and height values. Increasing the physical dimensions of the video from 320 240 to 640 480 will only make the pixels larger, just as it does in Photoshop and Fireworks when you zoom in on an image. The result is pixelated video, and it will also place an increasing strain on the bandwidth, or flow of data into Flash Player. In spite of our having said to never increase the size of a video, Flash Player 9,0,115,0 (and higher) now permits full-screen video playback. We ll review this feature later in the chapter. It changes video size in an exception-to-the-rules way.

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