U:RDoc::NormalClass[iI"ZStream:ETI"Zlib::ZStream;TI"Object;To:RDoc::Markup::Document:@parts[o;;[o:RDoc::Markup::Paragraph;[I"JZlib::ZStream is the abstract class for the stream which handles the ;TI"Dcompressed data. The operations are defined in the subclasses: ;TI"HZlib::Deflate for compression, and Zlib::Inflate for decompression.;To:RDoc::Markup::BlankLineo;	;[
I"PAn instance of Zlib::ZStream has one stream (struct zstream in the source) ;TI"Pand two variable-length buffers which associated to the input (next_in) of ;TI"Kthe stream and the output (next_out) of the stream. In this document, ;TI"N"input buffer" means the buffer for input, and "output buffer" means the ;TI"buffer for output.;T@o;	;[I"MData input into an instance of Zlib::ZStream are temporally stored into ;TI"Othe end of input buffer, and then data in input buffer are processed from ;TI"Ithe beginning of the buffer until no more output from the stream is ;TI"Oproduced (i.e. until avail_out > 0 after processing).  During processing, ;TI"Noutput buffer is allocated and expanded automatically to hold all output ;TI"
data.;T@o;	;[I"LSome particular instance methods consume the data in output buffer and ;TI"return them as a String.;T@o;	;[I"/Here is an ascii art for describing above:;T@o:RDoc::Markup::Verbatim;[I"F+================ an instance of Zlib::ZStream ================+
;TI"F||                                                            ||
;TI"F||     +--------+          +-------+          +--------+      ||
;TI"F||  +--| output |<---------|zstream|<---------| input  |<--+  ||
;TI"F||  |  | buffer |  next_out+-------+next_in   | buffer |   |  ||
;TI"F||  |  +--------+                             +--------+   |  ||
;TI"F||  |                                                      |  ||
;TI"F+===|======================================================|===+
;TI"B    |                                                      |
;TI"B    v                                                      |
;TI"H"output data"                                         "input data"
;T:@format0o;	;[I"PIf an error occurs during processing input buffer, an exception which is a ;TI"Msubclass of Zlib::Error is raised.  At that time, both input and output ;TI"Dbuffer keep their conditions at the time when the error occurs.;T@S:RDoc::Markup::Heading:
leveli:	textI"Method Catalogue;T@o;	;[	I"OMany of the methods in this class are fairly low-level and unlikely to be ;TI"Jof interest to users.  In fact, users are unlikely to use this class ;TI"Cdirectly; rather they will be interested in Zlib::Inflate and ;TI"Zlib::Deflate.;T@o;	;[I"/The higher level methods are listed below.;T@o:RDoc::Markup::List:
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