Advanced Data Communications and Networks by Dr. William J. Buchanan (auth.) PDF
By Dr. William J. Buchanan (auth.)
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Extra resources for Advanced Data Communications and Networks
2 bytes for the image width (unsigned integer). 2 bytes for the image height (unsigned integer). 1 byte of a packed bit field, with 1 bit for local color table flag, 1 bit for interlace flag, 1 bit for sort flag, 2 bits are reserved and 3 bits for the size of the local color table. 4 is a C program which searches for the image separator (2Ch) and displays the image descriptor data that follows. 4 shows a sample run. It can be seen from this sample run that the image is to be displayed at (0,0), its width is 640 pixels and its height is 480 pixels.
It can store and selectively extract multiple generations of the same file. Data can thus be recovered from damaged archives by skipping the damaged portion and locating undamaged data (using the f i z program). 1 Determine the Huffman coding for the following characters: 'a' 'f ,,    'e' 'g' 'p'    Note that the number of occurrences of the character is given within brackets. 2 The top line of letters of a QWERTY keyboard is QWERTYUIOP, the second line is ASDFGHJKL and the bottom line is ZXCVBNM, ..
When a repeated string is found, the referred item is replaced with a pointer to the original. Since images tends to contain many repeated values, the GIF format is a good compression technique. The format of the data file will be discussed in Chapter 5. 3 UNIX compress/uncompress The UNIX programs compress and uncompress use adaptive Lempel-Ziv coding. They are generally better than pack and unpack which are based on Huffman coding. Where possible, the compress program adds a . Z onto a file when compressed.
Advanced Data Communications and Networks by Dr. William J. Buchanan (auth.)