compression

We have an original zip library which uses the SharpZipLib and .NET 2.0. We need to research what is now possible in .NET 4.5 using System.IO.Compression and System.IO.Compression.ZipArchive. Should we use .NET 4.5 libraries or use a 3rd party open source library? Also, we need to be able to zip/unzip files larger than 4GB. Samples, blogs, any help is welcomed. Thank you Suresh 4GB is the maximum addressible size for a 32-bit pointer, hence it will not work for larger file. But you can try Zip64 which will work for larger files. This post might help you. Hope this will help! Thanks Suresh 3rd

I'm having trouble coming up with a way too decompress a String in Java. This is a basic Java class I'm taking so it only requires basic commands, nothing too fancy. The objective it to able to type C:\>java Compress -c aaaabbbbbcc in the command prompt and it will print a4b5c2 (like it is compress the argument string). The other objective is to type C:\>java Compress -d a5b7c4 and it will print aaaaabbbbbbbcccc (like it will decompress the argument String). The decompression is the issue I'm having. Here is my code, any help I get is much appreciated. import java.util.*; public class Compress

I've coded a small application that should uncompress data encoded in the gzip/deflate format. In order to accomplish this,I'm using the ZLIB library, using the uncompress function. The problem is that the function doesn't work! In orher words, data is not uncompressed! I post here the code: int (*decompress)(PBYTE,PULONG,PBYTE,ULONG); void DecodeData(PBYTE data,ULONG dataSize){ LoadLibrary("C:\\zlib1.dll"); decompress=(int(*)(PBYTE,PULONG,PBYTE,ULONG))GetProcAddress( GetModuleHandle("zlib1.dll"),"uncompress"); // Yeah I know the size is hardcoded and it's not right, but it's just a test, //

I am trying to figure out how GOP works Consider the uncoded frame sequence: I B B P B B P B B P B B I B B P B B P B I understand what The N(GOP) is, it's 12 if I am counting from Iframe to Iframe. I know what the predicted span is, it's 2. What is the reordered sequence for decoding for these frames? How would you increase random access? How would you increase compression? How do errors creep in? could someone explain it to me the 4 questions. thank you Check out this MPEG compression FAQ , particularly the section "Q. So is each frame predicted from the last frame?" for a more detailed

I've built a Windows Phone class to convert some WriteableBitmap into a AVI Full Frame (Uncompressed). Videos are really huge. Is there a simple codec implementation existing, like a codec that just zip images, or something that is making a next/previous XOR then zip it in jpeg? Windows Phone doesn't allow any unsafe code and most DLL cannot be wrapped into a C# WP library. So that's why I'm coding something from scratch. Note that I'm more efficient at coding from scratch than in studying C++ existing sources (I'm not a C++ coder), so what I'm searching is infos about a compressed AVI format

I'm a bit confused by zlib compressing an input of a string of type char . Below I have the output from the code as posted and what I noticed was that the input string was shorter in bytes compared to the output. The uncompressed size was 8 bytes and the compressed is 12 ? Am I not seeing this correctly instead? Here's the code. #include <stdio.h> #include <string.h> #include <assert.h> #include <iostream> #include "zlib.h" void print( char *array, int length) { for(int index = 0; index < length; index++) std::cout<<array[index]; std::cout<<std::endl; } void clear( char *array, int length) {