ruby gzip in web programming

[Logan 2]

Hello guys,

I was something confused if you all knows how to handle GZIP decompression in Ruby? I'm getting some content from the website encoded in GZIP and I need to deflate it. I already got sending and receiving/parsing data done, now I just want to know about the decoding procedure. I heard that Ruby came prepackaged with a copy of the ZLib library but I am unable to find the related documentation on it.

Thanks and regards .
Alisha.

[opaper]

Zlib::GzipReader

Zlib::GzipReader is on of the class through which you can read a gzipped file. GzipReader is necessary to collaborate with an IO, or -IO-lie, object.

This is the implementation of the GzipReader below-

Zlib::GzipReader.open('hoge.gz')
{
|gz|
print gz.read
}

File.open('hoge.gz') do |f|
gz = Zlib::GzipReader.new(f)
print gz.read
gz.close
end

[MindSpace]

Invalid Header in ruby programming -

According to me this is the best way to split the header and content would be to do which would be as follows-

response = @tcp.gets(nil).split("\r\n\r\n")

I will look more into this later. I am also not getting much documentation on how gzip streams are structured. The only thing I seemed to be able to find was this.

[Modifier]

Zlib::Error

This is the superclass for all occurred exceptions during the execution of Ruby/zlib.There are some exceptions which are defined as subclasses for Zlib::Error.These exceptions are raised when zlib library functions return with an error.

The exceptions are as follows-

• Zlib::streamEnd
• Zlib::NeedDict
• Zlib::dataError
• Zlib::streamError
• Zlib::MemError
• Zlib::BufError
• Zlib::VersionError

[Praetor]

I am going to show you an script which can help you to to compress the string. Compress and uncompressing of strings uses the deflate algorithm.

In the following method of compression of a string,first the whole string is converted into the specified character set which would be necessary for programming languages where strings are represented as 2-byte/char Unicode.

require 'chilkat'

gzip = Chilkat::CkGzip.new()


success = gzip.UnlockComponent("Anything for 30-day trial")
if (success != true)
    print gzip.lastErrorText() + "\n"
    exit
end


s = "A friend called me for surfing on the internet "
s = s + " But I was too let to go with him..."
s = s + s
s = s + s

cs = gzip.deflateStringENC(s,"windows-1252","base64")
print cs + "\n";



s2 = gzip.inflateStringENC(cs,"windows-1252","base64")
print s2 + "\n";

[Katty]

Compressing a string into a gzip file

The GzipWriter would be used to compress the string and then can be transport to the file.This is one of the class for writing a gzipped file. GzipWriter should be used to associate with an instance of IO class.

The code representation for the compressing a string into a gzip file would be as follows-

f = open('mine.gz', 'w')
gz = GzipWriter.new(f)
gz.write 'The reservation has been confirmed...'
gz.close