RSpec
Ruby on Rails
Rubynew
= private
= protected
new(p1 = v1, p2 = v2, p3 = v3, p4 = v4)
public
Arguments
level |
An Integer compression level between BEST_SPEED and BEST_COMPRESSION |
windowBits |
An Integer for the windowBits size. Should be in the range 8..15, larger values of this parameter result in better at the expense of memory usage. |
memlevel |
Specifies how much memory should be allocated for the internal compression state. Between DEF_MEM_LEVEL and MAX_MEM_LEVEL |
strategy |
A parameter to tune the compression algorithm. Use the DEFAULT_STRATEGY for normal data, FILTERED for data produced by a filter (or predictor), HUFFMAN_ONLY to force Huffman encoding only (no string match). |
Description
Creates a new deflate stream for compression. See zlib.h for details of each argument. If an argument is nil, the default value of that argument is used.
examples
basic
f = File.new("compressed.file","w+") #=> #<File:compressed.file> f << Zlib::Deflate.new().deflate(File.read("big.file")) #=> #<File:compressed.file> f.close #=> nil
a little more robust
compressed_file = File.open("compressed.file", "w+") #=> #<File:compressed.file> zd = Zlib::Deflate.new(Zlib::BEST_COMPRESSION, 15, Zlib::MAX_MEM_LEVEL, Zlib::HUFFMAN_ONLY) #=> #<Zlib::Deflate:0x000000008610a0> compressed_file << zd.deflate(File.read("big.file")) #=> "\xD4z\xC6\xDE\b\xA1K\x1Ej\x8A ..." compressed_file.close #=> nil zd.close #=> nil
(while this example will work, for best optimization the flags need to be reviewed for your specific function)
