when a file is compressed,what happens to the file?
597335
One scheme for file compression is called Huffman Compression. Essentially, if you think of it as if there are only ascii characters in a file, there are some letters that appear more often than other letters. The letters "a" and "e" are more likely to appear in a file than "j" and "z".\n\nAscii is represented as 8 bits. For example, NULL is represented as 00000000. 3 is represented as 00110011. However, there can be more efficient schemes for representation of these characters. We could make 01 be "a" for example, or 10 be "e". In order for us to be able to decipher such a representation however, each bit pattern that represents a letter cannot be a prefix of another bit pattern representing another letter. We couldn't use 11 to represent one thing and 110 to represent another since if we where to parse 11 in the 110, we would assume it represents what is represented by 11.\n\nTo solve this problem, two schemes are used. One scheme could be to assume a best encoding. In other words, set a to be 10 and e to be 01, setting an encoding that has no prefixs of other values and works best with most files. Another scheme is whats called a huffman tree. Under this scheme, we assemble a tree by taking a set of all of the values in our file. Take the following set of characters and associated number of occurances in a file.\n\na(1) e(15) c(20) d(17)\n\nWe start by taking the two least occuring characters in the file and combine them into a single tree. In other words, there would be some root node, its left child would be a and its right child would be e. We would then add the occurances of these two letters and place it back in the list of characters. Our updated list is - \n\na-e(16) c(20) d(17)\n\nWe would then take a-e and d and combine that into single tree. The a-e tree would be in the left subtree in the tree and d would be in the right. We would take this and place it back into the list. We now have - \n\na-e|d(33) c(20)\n\nWe then take these two and combine them using the same scheme. In the end we could then use the following scheme to represent this file - \n\nc   1\nd   01\na   000\ne   001\n\nThis is because, in our tree, to get to c we traverse right once. To get to d we got left once, then right once. So on and so forth. This produces an optimal bit representation scheme for a file, but is often times an intensive process.\n\nOnce we choose our scheme, the beginning of the file we create is some bit sequence that explains the encoding scheme. It would list what a equals, c equals, etc. After that would be the representation of our file with each character replaced by its appropriate encoding pattern. Although here it was explained with ascii, it can be applied to any representation.\n\nIn short, compression just represents each value by a new bit pattern in the hope to shorten the size of the file.
1122881
You dont need to zip each file. You just need to create ONE zip file and just drag and drop the files into the zip file that you just created.\n\nYou should use http://www.winzip.com\n\nAnd yes, it does compress it A LOT...almost 80%.
136497
You need to load your file into your documents or where ever you load a file, then Zip the file.  The person you are sending the file to will not get the file that size without it being Ziped.  You might have to zip it twice.
611097
ppl!!! plz give complete info, like operating system, and extention of file,\n\nif its windows, just click on the file , then it will give u an option to find the\n\nappropriate program to open that file on the internet,\n\ngo there and download the file, its probably compressed, \n\nand always have a antivirus software installed in case its a virus
319278
7zip, it have higher compression than regular zip file, cause it use a newer and different compression algorithm.
287537
I would try winzip or winrar compression utilities. I am not sure how small it will be able to make it.
1035663
You can compress the file in to a ZIP file by using WINRAR. u need that software to do it. U can download that for free from download.com. click on the below link and download the free trial version :\n\n http://www.download.com/WinRAR/3000-2250_4-10530598.html?tag=pop\n\nit can compress and decrease ur file size to good extent by saving it as WinRar file. its ready to upload or transfer. when u want to use the compressed file, extract the contents back using the same software\n\nGood Luck. bye
527868
you can use WinRar, a good compressing program, you can download it from here
598875
if u transfer a file which is infected from a virus... tht virus iwll affect ur computer...
1052983
Well if you were to send a native file there is always a possibility for file corruption. So I would personally recommend generating a PDF document since they are already compressed and can handle inter or intra net travel. If you also generate a PDF of the document then you can view it with Acrobat Viewer and confirm that it looks like you want it to before you submit it into the email program.
313100
hey dear,\nthe .zip or .rar files are the extension to compressed files to make them easier to donwload as they wud download fast due to small size. they are compressed using softwares called as winzip to make .zip files and winrar to make .rar files. these files can again be decompressed using the same software used to compress them like using winzip to uncompress .zip file and winrar to uncompress .rar files. u can get them from www.winzip.com and www.winrar.com. hope this helps
1132178
after you unzipped it you have to see one or more files. if it's a program duble click the one with the .exe extension
656454
if you have Windows Media Player, just convert it to an MP3 file which is a compressed file.
143066
You can't if data on the file has been written over which is likely the case.
1165995
its all right.the file is chopped into little bits for easy transfer and for max compression.u have to extract the files and delete ra files.(your choice).\nu will have a iso file or mdf as a result.if its iso u can burn using any burning tool but if it is mdf then u should use alcohol 120%.\nits a dvd i think so better check it out.
210167
you mean after unzipping u get a bin file?\nbin&#92;cue is a image\nburn as image,the cue file
495695
The ZIP compression format DOES allow you to read the names of files without decompression. It maintains a manifest of it's internal files. \n\nIt is probably a good idea to use a 3rd party component to handle the decompression routines.\n\nThis one is free:\nhttp://www.icsharpcode.net/OpenSource/SharpZipLib/Default.aspx\n\nhere is some code that demo's how to use it:\nhttp://www.icsharpcode.net/OpenSource/SD/forum/topic.asp?TOPIC_ID=5264\n\nI use this IP*Works! ZipLib. It's not free but it works well:\nhttp://www.nsoftware.com/portal/dotnet/\n\ngood luck!!