تطوير خوارزمية لضغط الملفات النصية

الملخص EN

Data compression is consider a very important field of the various applications of computers.

Besides decreasing the storage capcity needed by the data in order to he saved on a disk , it also decreased the volume of the required package to transmit the data via the digital network, and, hence, decreases the amount of time that is necessary to transmit the data.

Moreover it decreases the errors during the process of transmission .

Due to the importance of text files .

this paper dealt with the compressed text files using compression algorithm called LZW algoritham, after developing and linking it to another suggested method to compress different types of text files.

The proposed method includes two programes .

compression decompression.

The compression passes through two stages: 1) The use of well known LZW algorithm to get a file that is smaller than the orginal one and that contain codes to be compressed later.

2) The use of propose concat algoritham to get ride of the unnecessary bits of the propaget file of the first stage.

The decompression programme works as the apposite to compression programme since it decompressed the file resulted of concat algorithm .and.

then decompressed the compression from LZW algorithm, t he suggest algorithm is a Iossles method, so the file that result from decompression is the same file that compressed in size and contain.

This method has been applied to a number of different text files with different size and data type.