Zip Bit
Software and data compression for 64 bits in easy steps
What is compression?
The compression the conversion process to reduce the size of a file by encoding its information data, performed so that data can be stored or transmitted more efficiently. This compression can be performed on the data, but also on a particular type of data: the binary file. This binary file can be in the form of an executable or dynamic link library (DLL) or another type of binary files. Anyway, the result is a reduction in the number of bits and bytes, leading to a smaller file size. The size of the data in a compressed relative to its size of origin is known as the compression ratio. The ratios may vary depending upon the general algorithm and depending on the type of file to compress.
Why compression?
It is all too often short of disk space, although modern PCs tend to be equipped relatively large hard drives. A similar problem arises when sending or receiving files over the Internet. It may take a really long time to send a large file, and even very long on a slow connection. So what can we do to remedy? The answer is to compress the files so they take less space and time of sending.
How to use compression?
One way is to use programs that are specifically created to compress and decompress files. Once compressed, the files of most can not be used until they are again decompressed. Thus, the compression is good for archiving or to send an email. A well known example of a ZIP compression technology is a common standard for file compression. For binary, the path is not possible because the executable file compressed lose all opportunities premise, for it must be autonomous (see below how this is resolved in binaries). Compression is also used in many cases, without the user noticing. A modem uses a form of compression if it sends and receives data. Another example is an image in JPEG format.
How does compression work?
When you have a file containing text, it can be repetitive simple words, combinations of words and expressions that use too much storage space to be productive. The same thing applies to binaries with repetitive songs and bytes. There may be media such as images which the information is of far more space than necessary. However, the document or file can be compressed to reduce this inefficiency electronically.
How to get a compression?
The compression is done using compression algorithms (formulas) that reorganize and rearrange the information so that data can be stored so more economical. The information coding, data can be stored using fewer bits. This is done by using a compression / decompression which modifies the data structure temporarily. Compression reduces the information using different ways and more efficient to represent information. The methods may include simply removing spaces, using two characters to represent a string repeated or replaced by more sequences of bits with the smallest. Some compression algorithms go so far as to delete information quite reach a smaller file size. According to the algorithm used, the files can be sufficiently limited in terms of their original size.
Are there different systems?
If the opposite of compression, decompression, produces an exact replica of the original data, then the compression is lossless. The other type, the lossy compression, usually applied to the image data does not allow the reproduction of a exact replica of the original image, but has a higher compression ratio. Thus, lossy compression allows only one approximation of the original must be regenerated.
What is lossy compression?
Lossy compression reduces file by removing bits data that we hope are not necessary. MP3 is such a system, it relies on how the brain interprets sound and uses various tricks to produce something that sounds almost the same, but is in fact as much as 90% missing data. Another dissipative system is JPG. It is designed to provide compression ratio for images. For example, in an image containing a landscape with a blue sky, all slightly different shades of green and blue are eliminated. The essential nature of the data is not lost because the basic colors are always present. Much of the image will also be colored lines perhaps some or all surfaces, but the image will remain the same for the human eye.
What is lossless compression?
Lossless compression is a type of compression that can reduce the file size without losing information. The original file can be recreated exactly the same thing when unzipped. To do this, algorithms to create benchmarks for models, storing them in a table and Send the table with the encoded file is now smaller. Dencompressed When the file is "re-generated" by the substitution of reference points with the original information.
When to use lossless compression?
Lossless compression is ideal for text documents and data digital case information loss can be tolerated. ZIP compression, for example, is a lossless compression which detects patterns and replaces by one character (plus a indicator). This is based on the fact that most files contain large amounts of space or repetitive data. For example, note that in this text you are reading right now, the compression of the word "appears again and again, each taking 11 bytes of storage (a for each letter). A compression system and notes that after the first occurrence, rather than storing the word itself, it stores an indicator of byte to indicate that it is a word again, plus one byte to indicate which word it is. The result is that each occurrence of "compression" now needs 2 bytes rather than 11, a saving of 9 bytes and more than 80% of the space of this word. If repeating this process for the 256 most common means that it can make a difference in file size. During decompression of the file, the decompression program is repeated words of these codes and restores full words in their place restoring the document at its original size and content.
What are the results?
The success of compression data depends largely on the data itself because some data types are inherently more compressible than others. Speaking general, some elements in the data are more frequent than others and most compression algorithms exploit this property, known as redundancy. The greater the redundancy in the data, the most successful data compression will be. In this regard, the digital video has a high redundancy which makes it very suitable for compression.
A device (software or hardware) that compresses data is often known as a encoder or encoder, then a device which decompresses the data is called a decoder. A device that serves as both an encoder and decoder is known under the name of a codec. Many compression techniques have been developed and some techniques can be applied without loss to any type data. In recent years the development of technical loss, specifically for image data, has greatly contributed to the achievement digital video applications. Well, as for the compression in general, but what about compression of binaries?
Software compression
As mentioned above, a compressed executable file (or DLL) must be independent. Therefore, there must be an archive self-extracting compressed data which is packed with the decompression code in an executable file. In this way, there is no program necessary to run a separate executable file compressed. The decompression code that is added to the data compression is often called heel relief. Running an executable compressed essentially means that the heel of decompression unpacks the executable code home before ordering the recomposition original binaries. The effect is the same as if the original executable was executed. For the casual user, compressed and uncompressed executables are indistinguishable.
What packaging?
The act of compressing an executable file or DLL is often referred to as "packaging", a typical name for an executable compression becomes a compression software. decompress executables Most packaged directly into memory and do not need the file space external system to boot. However, some linked decompressor are known to write the executable file uncompressed file system to to start it.
Why packers use?
Distributors use compression software executable to a variety of reasons, mainly reduce the storage requirements of the software. Executable compressors are specifically designed to compress executable code, so they often compression ratios of better than standard data compression programs. Software compression allows distributors to stay within the limits of their distribution media chosen (CD, DVD, …), or to reduce the time and customers require bandwidth to access software distributed via the Internet. There There Another reason for the compression: compression executable is also frequently used to deter reverse engineering or hide content executable by proprietary methods of compression and / or add encryption. Malware is known to be compressed in many cases, to conceal their presence from antivirus scanners. compression of the executable can be used to prevent the dismantling direct signatures of literals string mask and change. However, compression executable does not eliminate the possibility of reverse engineering, it can slow the process. In general, compression alone is totally insufficient to overcome the cracking, much more reliable protectors for this purpose.
Is executable compressed slower?
A software compression requires less storage space in the file system, thus taking less time for the sound card data file system in memory. On the other hand, it takes some time to decompress the data before the execution begins. However, the speed of various storage media has not followed up with processor speeds on average, so that storage is often the bottleneck. Thus compressed executable load faster on most common systems. It's sort of theory that modern desktop computers, which is rarely seen unless the executable is unusually large, if the loading rate is not a primary reason for or against compress an executable file. Software compression can store more software in the same space without the hassle of having to manually unpack the archive file whenever the user wants to use the software.
And for 64-bit (x64) systems?
Data compression for 32 bits or 64 bits is obviously exactly the same for both systems. In addition, compression of 32 and 64-bit executable results in comparable proportions. In fact, everything that is said in general is also true in particular for 64-bit software. Although the sizes between 32 and 64 bit software for the original executable differ slightly in favor of 32-bit system, there is often a better value for the compression software 64 bits because there are more of the same model in the software (Only the same number of bits and bytes are available for both). This makes it even more desirable to compress 64-bit software for reasons of reduction of space and time compared to a 32-bit software.
About the Author
Jose Sogiros is a developer with 5 years of experience in the software compression business but he’s also a developer creating smart, renovating and user-friendly developer tools to help efficiently produce better program protection software. Continue reading with 64 bit software compression for x64 related study on the topic or for specific and more indepth information about 64 bit software protection
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