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Net::SSH::Perl::Comp - Compression/Decompression base class
use Net::SSH::Perl::Comp; my $comp = Net::SSH::Perl::Comp->new( $comp_type ); $comp->compress($data);
Net::SSH::Perl::Comp is a base class for compression/decompression classes. Currently the only such class is the Zlib implementation (using Compress::Zlib), which is the class Net::SSH::Perl::Comp::Zlib.
Each compression object generally has its own internal "state"; this state changes when you compress or decompress data. The SSH protocol dictates that you must have two separate objects to compress and decompress data: one for compression, one for decompression. So, for example, you would create two Net::SSH::Perl::Comp objects:
my $in = Net::SSH::Perl::Comp->new('Zlib'); my $inflated = $in->decompress($data); my $out = Net::SSH::Perl::Comp->new('Zlib'); my $deflated = $out->compress($data);
Constructs a new compression object of compression type $comp_type and returns that object.
If @args are provided, the class's init method is called with those arguments, for any post-creation initialization.
Initializes $comp and sets the compression level to $level. This method will be called automatically from new if you've provided @args to new. So, for example, you could write:
my $comp = Net::SSH::Perl::Comp->new('Zlib', 5);
To create a new Zlib compression object and initialize its compression level to 5.
Compresses $data using the underlying compression mechanism; returns the compressed data.
Decompresses $data using the underlying decompression mechanism; returns the decompressed data.
"Enables" the compression object. This is useful in the context of the key exchange (Kex) classes, which create a new compression object during key negotiation, but don't actually turn it on ("enable" it) until receiving/sending the SSH2_MSG_NEWKEYS message.
Net::SSH::Perl::Comp objects (and subclasses) are disabled by default.
Returns the state of the "enabled" flag, ie. whether the compression object is "turned on".
This is used by Net::SSH::Perl::Packet when determining whether data it receives/sends to the server should be decompressed/compressed, respectively.
Please see the Net::SSH::Perl manpage for author, copyright, and license information.