compression

I'm trying to create a ZIP archive with multiple text files as follows: Dictionary<string, string> Values = new Dictionary<string, string>(); using (var memoryStream = new MemoryStream()) { string zip = @"C:\Temp\ZipFile.zip"; foreach (var item in Values) { using (var archive = new ZipArchive(memoryStream, ZipArchiveMode.Create, true)) { var file = archive.CreateEntry(item.Key + ".txt"); using (var entryStream = file.Open()) using (var streamWriter = new StreamWriter(entryStream)) { streamWriter.Write(item.Value); } } } using (var fileStream = new FileStream(zip, FileMode.Create)) {

I am writing a utility class which converts strings from one alphabet to another, this is useful in situations where you have a target alphabet you wish to use, with a restriction on the number of characters available. For example, if you can use lower case letters and numbers, but only 12 characters its possible to compress a timestamp from the alphabet 01234567989 -: into abcdefghijklmnopqrstuvwxyz01234567989 so 2010-10-29 13:14:00 might become 5hhyo9v8mk6avy (19 charaters reduced to 16). The class is designed to convert back and forth between alphabets, and also calculate the longest source

How can I determine whether a string was compressed with gzcompress (aparts from comparing sizes of string before/after calling gzuncompress , or would that be the proper way of doing it) ? A string and a compressed string are both simply sequences of bytes. You cannot really distinguish one sequence of bytes from another sequence of bytes. You should know whether a blob of bytes represents a compressed format or not from accompanying metadata. If you really need to guess programmatically, you have several things you can try: Try to uncompress the string and see if the uncompress operation

Let’s say I had three scripts. Main.py (has all imports), 1.py (random script), 2.py (random script). pyinstaller -F --onedir Main.py (80mb) pyinstaller -F --onedir 1.py (80mb) pyinstaller -F --onedir 2.py (80mb) This creates 3 folders I then copy 1.exe and 2.exe to Main folder with all dependencies and this runs fine. Two issues are present: The issue is the size. One file reduces this to 30mb, one folder keeps it at 80mb More importantly, the exe’s are unable to leave that folder. I’ve had to resort to using shortcuts in Python. I am following this , which supposedly is a workaround. My

I have the first contiguous 2/3rds of a file that was compressed with zlib's deflate() function. The last 1/3 was lost in transmission. The original uncompressed file was 600KB. Deflate was called multiple times by the transmitter while chopping the original file into chunk sizes of 2KB and passing Z_NO_FLUSH until the end of file when Z_FINISH was passed. The resulting complete compressed file was transmitted, but partially lost as described. Is it possible to recover part of the original file? If so, any suggestions on how? I'm using both the plain C implementation of ZLIB, and/or the Python

I have a PNG image and got its Base64 PNG string representation. It's still quite large and i'd like to know if it can be significantly further compressed. Is that even possible? Background I am using Selenium 2 (Java) to create a screenshot of the current web page, convert it as base64 string and send that string to the JavaScript executor to recreate that image and do some image processing. But if that string size is too large, the server returns an Exception. The simple answer: No - not without loosing the "printable string" nature Usually PNG already uses sophisticated compression like it