whats exactly going on in file compression with any file compress softwares..?

Question

what is physically going on when compresses a file by any file compression softwares..in wich way the file can be compressed by that.what is internal and external operations done on the fule when compression is going on.?

Answer 1

Sorry you want history in words.

Anyway, whole thing is based on frequency of occurrences of words (huffman), pairs of words (tries), their lengths (run length encoding), etc

Answer 2

File compression software takes identical strings of data and replaces them with pointers to a single copy. So, for example, if you had a string that looked like aaabbbaaaccc, it would replace it with aaabbbccc. That's a very high-level explanation, you can read technical articles that explain exact details.



When the file is uncompressed, it replaces the pointer with a copy of that single string, so that the original file content is replaced.

Answer 3

Too long to explain!

Google "file compression algorythms": each type of compression will take you a few weeks to learn and understand.