By default when you compress a file or folder using the gzip command it will have the same file name as it did before but with the extension. The screenshots below apply to Ubuntu specifically, but the gzip command works on other Unix-like OSs, too.
The simplest way to compress a single file using gzip is to run the following command:. Some files compress better than others. Other file types such as JPEG images and MP3 audio files do not compress at all well and the file may actually increase in size after running the gzip command against it.
JPEG images and MP3 audio files are already compressed and therefore the gzip command simply adds to it rather than compressing it. Sometimes a file cannot be compressed. To force the gzip command to do its stuff simply run the following command:. By default when you compress a file using the gzip command you end up with a new file with the extension. To compress the file and keep the original file must specify the -k flag:. I you run the following command you would end up with a file called mydocument.
The whole point of compressing files is about saving disk space or to reduce the size of a file prior to sending it over a network. The gzip command provides the kind of statistics you require when checking for compression performance.
This process doesn't create one file called foldername. Instead, it traverses the directory structure and compresses each file in that folder structure. To compress the folder structure as one file you are better off creating a tar file and then gzipping the tar file.
Example Uses of the Linux gzip Command
You can compress a file in different ways. For example, you can go for a smaller compression which will work faster or you can go for maximum compression which has the tradeoff of taking longer to run. The gzip command should not be used when working with standard zip files. You can use the zip command and unzip command for handling those files. Linux Switching from Windows.
Tweet Share Email. The gzip command is a common way of compressing files within Linux.Plenum chamber vw
To compress a file called mydocument. If the file name contains spaces, surround it by quotes:. The gzip command only attempts to compress regular files and folders. Use the following command to decompress a gzip archive:. To decompress the mydocument. To get the list of statistics run the following command:.For applications that require data compression, the functions in this module allow compression and decompression, using the zlib library.
There are known incompatibilities between the Python module and versions of the zlib library earlier than 1. For reading and writing. Computes an Adler checksum of data. An Adler checksum is almost as reliable as a CRC32 but can be computed much more quickly.
The result is an unsigned bit integer. If value is present, it is used as the starting value of the checksum; otherwise, a default value of 1 is used. Passing in value allows computing a running checksum over the concatenation of several inputs. The algorithm is not cryptographically strong, and should not be used for authentication or digital signatures. Since the algorithm is designed for use as a checksum algorithm, it is not suitable for use as a general hash algorithm. Changed in version 3.
Compresses the bytes in datareturning a bytes object containing compressed data. Raises the error exception if any error occurs. Larger values produce better compression at the expense of greater memory usage.
The resulting output will include a zlib-specific header and trailer. The memLevel argument controls the amount of memory used for the internal compression state. Valid values range from 1 to 9.
Higher values use more memory, but are faster and produce smaller output. This is a sequence of bytes such as a bytes object containing subsequences that are expected to occur frequently in the data that is to be compressed. Those subsequences that are expected to be most common should come at the end of the dictionary.This doesn't work on very large strings k. I modified the decompress method a bit in that case.
Using apache commons io utils to get the bytes out. Decompress logic assumes that the base64 encoded byte array was a UTF-8 encoded unicode character string. Or event better using java. ZipException: invalid code lengths set at java. I have following following String to decompress. This string was first Base64 encoded and compressed. I have stored the byte array as a string. How do I tweak the compress and decompress in such a way that, compress takes a String and returns a compressed string not byte arraydecompress take the above compressed string and return a decompressed string?
The moment I convert the byte array to a string in compress and return it, the decompress fail to convert the compressed string back to byte array for decompressing. Your solution worked.Asus k42n schematic diagram diagram base website schematic
Thanks mate. Skip to content. Instantly share code, notes, and snippets. Code Revisions 2 Stars 54 Forks Embed What would you like to do? Embed Embed this gist in your website. Share Copy sharable link for this gist.
Learn more about clone URLs. Download ZIP. BufferedReader ; import java. ByteArrayInputStream ; import java. ByteArrayOutputStream ; import java. IOException ; import java. InputStreamReader ; import java.This function compresses the given string using the ZLIB data format.
Note : This is not the same as gzip compression, which includes some header data. See gzencode for gzip compression. The level of compression. Can be given as 0 for no compression up to 9 for maximum compression. If -1 is used, the default compression of the zlib library is used which is 6. Example 1 gzcompress example. Version Description 5. Edit Report a Bug. Parameters data The data to compress. Changelog Version Description 5. See Also gzdeflate - Deflate a string gzinflate - Inflate a deflated string gzuncompress - Uncompress a compressed string gzencode - Create a gzip compressed string.
Get start microtime 2. Call gzcompress 3. Get end microtime 4. Report average duration of cycles The Running some rough calculations, the time it takes to compress the data at level 9 will never be larger than the time it takes to transmit slightly-less compressed data at levels 6 or lower. In other words, in our application, we have no reason not to fully-compress each PHP script's output. Netscape 4 on all platforms[? Email me if you want to know more.Line speed calculation formula
No, it doesn't return gzip compressed data -- specifically, the CRC is messed up.Tip: Compressing files in memory in this way is faster than using an external program 7-Zip but the compression ratio is poorer. Then: The MemoryStream is converted to a byte array. Finally the File. WriteAllBytes method outputs the data to the file compress. Write the compressed data to the disk. Compress data. Calling a GZIP method should be simple. In the.
NET Framework, no simple method is available by default. We develop one that compresses any byte array in memory and returns that GZIP data. We implement a static compression method.Union in java
You will need the System. IO, System. Compression, and System. Text namespaces. First, a new string is created with 10, X characters. This is converted to a byte array in GetBytes. C program that implements Compress method using System. IO; using System. Compression; using System. WriteAllBytes "compress. Write raw, 0, raw.This article presents two methods to compress and decompress string s using System.
After converting code from VB. NET 1. NET 3. Code samples found on the web or on VS help were presenting solutions dealing with FileStream but in this case, a string is given as an input parameter. So the little challenge was to go from a string to a byte array byte and vice versa without losing a char nor changing its encoding because I ended up finding that System.
Deflate and Gzip compress and decompress functions
Plus the Flush method on GZipStream with the compression option doesn't flush everything So as I found no method transforming a string into a byte and vice versa without involving encoding specifications, I ended up with a loop and a cast. If you have a better idea, please tell me so. And I found out, if you only flush a GZipStream instance and retrieve the data from the underlying stream without closing this GZipStream instance, you miss part of the data.
Well, if you haven't dealt with a lot of streams like me, hopefully this will avoid loss of time!I recently had a scenario where my application was sending raw json data to send to the browser in string format. This data was used as a viewstate by using hidden input element.
When the app started to run in production environment, we realised that this raw data is very big in size and needs to be compressed. So, the only solution available here was to compress the raw data and decompress it when app wants to access the data. Both needs to happen server-side. My app uses. NET v4. Net ASP. NET C Featured. Siddharth specializes in building, managing on-premise, cloud based real-time standard, single page web applications SPAs. He has successfully delivered applications in health-care, finance, insurance, e-commerce sectors for major brands in the UK.
How to build a custom Kafka Consumer application? How to build a custom Kafka Producer application? How to set up multi-broker Kafka cluster? How to set up Apache Kafka locally? How to test Pipes in Angular? Software Design Patterns. Introduction to Dependency Inversion Principle.
A beginners guide to Dependency Injection. How to upload any file to Azure Blob storage service? When to use Dependency Inversion Principle in application? How to compress, decompress a string in c using GZipStream? Write buffer, 0, buffer. Length]; memoryStream. Read compressed, 0, compressed. BlockCopy compressed, 0, gZipBuffer, 4, compressed.Tournament os
Length ; Buffer. BlockCopy BitConverter. GetBytes buffer. Length0, gZipBuffer, 0, 4 ; return Convert.
C# Compress Data: GZIP
ToInt32 gZipBuffer, 0 ; memoryStream. Write gZipBuffer, 4, gZipBuffer. Read buffer, 0, buffer.
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