Description:
Data compression algorithms and theory.
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How to uncompress this file - was compressed using closed source windows library
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I am reading some UDP packets whose payload has been compressed using windows only library "xceed zip verion 4.2" I am trying to uncompress the UDP packets payload on a Linux box. I have no idea what compression algorithm the windows library "xceed zip verion 4.2" is using. How will I go about reverse engineering what compression algorithm was... more »
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Compression as a measurement standard
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So far we got specified standards and entropy encoders that efficiently compress text, images, audio/video. They all reduce the target data by a certain amount depending on the "complexity" of the content. I was individually compressing a couple large text files to cut my dirt-poor friend some slack since his dumb ass is still using... more »
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BALZ - modern LZ compression
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Hi all! Let me introduce my new LZ-based file compressor called BALZ. The main benefit of this compressor is very good balance between: + compression ratio + compression/decompression speed + memory usage It has 64 MB dictionary, and at compression it uses only ~130 MB (about 2N!). This compressor represents a glory of LZ-compressors. Forget about... more »
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Use of Tunstall codes for data compression
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Hi Folks, Consider the source alphabet SIGMAin = {a, b} where P(a) = 0.75 and the output alphabet SIGMAout = {0,1}. If I build a 2bit Tunstall code for this setup I arrive at the following codebook: aaa -> 00 aab -> 01 ab -> 10 b -> 11 In Sayood's "Introduction to data compression" book on pg 67 he says... more »
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generating function algo
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Did anybody experiment with applying generating functions to compression? Clearly, not all sequences will have a power series expansion (ie. sequence of primes) but many do. Also, can anyone recommend an efficient method of compressing timestamps which could be expressed as string or numerically, ie.... more »
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Arithmetic Assistance
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I am trying to learn more of the Arithmetic method of compression. So I laid this model to myself.... I have a 2 in 14 chance to have a compressible result, and a 12 in 14 chance of having a non-compressible result. Statistically speaking of course. Now I figure the cost to determine will be higher than the... more »
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problem with LZO: undefined reference to '__lzo_init2'
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Hi, I need help with LZO. I write a programm in C, with Linux (debian) and I need to use LZO for compress my data. I install LZO and in my code I add: ...and in my 'main': lzo_init(); The answer, when I compiling is: gcc MyProgram.c -o MyProgram /tmp/cc2Lx3eX.o: In function `main': MyProgram.c:(.text+0x19fc): undefined reference to `__lzo_init2'... more »
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