In Files

  • zlib/zlib.c

Zlib::Deflate

Zlib::Deflate is the class for compressing data. See Zlib::ZStream for more information.

Public Class Methods

deflate(string[, level]) click to toggle source
Zlib::Deflate.deflate(string[, level])

Compresses the given string. Valid values of level are Zlib::NO_COMPRESSION, Zlib::BEST_SPEED, Zlib::BEST_COMPRESSION, Zlib::DEFAULT_COMPRESSION, or an integer from 0 to 9 (the default is 6).

This method is almost equivalent to the following code:

def deflate(string, level)
  z = Zlib::Deflate.new(level)
  dst = z.deflate(string, Zlib::FINISH)
  z.close
  dst
end

See also Zlib.inflate

 
               static VALUE
rb_deflate_s_deflate(int argc, VALUE *argv, VALUE klass)
{
    struct zstream z;
    VALUE src, level, dst, args[2];
    int err, lev;

    rb_scan_args(argc, argv, "11", &src, &level);

    lev = ARG_LEVEL(level);
    StringValue(src);
    zstream_init_deflate(&z);
    err = deflateInit(&z.stream, lev);
    if (err != Z_OK) {
        raise_zlib_error(err, z.stream.msg);
    }
    ZSTREAM_READY(&z);

    args[0] = (VALUE)&z;
    args[1] = src;
    dst = rb_ensure(deflate_run, (VALUE)args, zstream_end, (VALUE)&z);

    OBJ_INFECT(dst, src);
    return dst;
}
            
Zlib::Deflate.new(level=DEFAULT_COMPRESSION, window_bits=MAX_WBITS, mem_level=DEF_MEM_LEVEL, strategy=DEFAULT_STRATEGY) click to toggle source

Creates a new deflate stream for compression. If a given argument is nil, the default value of that argument is used.

The level sets the compression level for the deflate stream between 0 (no compression) and 9 (best compression. The following constants have been defined to make code more readable:

  • Zlib::NO_COMPRESSION = 0

  • Zlib::BEST_SPEED = 1

  • Zlib::DEFAULT_COMPRESSION = 6

  • Zlib::BEST_COMPRESSION = 9

The window_bits sets the size of the history buffer and should be between 8 and 15. Larger values of this parameter result in better compression at the expense of memory usage.

The mem_level specifies how much memory should be allocated for the internal compression state. 1 uses minimum memory but is slow and reduces compression ratio while 9 uses maximum memory for optimal speed. The default value is 8. Two constants are defined:

  • Zlib::DEF_MEM_LEVEL

  • Zlib::MAX_MEM_LEVEL

The strategy sets the deflate compression strategy. The following strategies are available:

Zlib::DEFAULT_STRATEGY

For normal data

Zlib::FILTERED

For data produced by a filter or predictor

Zlib::FIXED

Prevents dynamic Huffman codes

Zlib::HUFFMAN_ONLY

Prevents string matching

Zlib::RLE

Designed for better compression of PNG image data

See the constants for further description.

Examples

Basic

open "compressed.file", "w+" do |io|
  io << Zlib::Deflate.new.deflate(File.read("big.file"))
end

Custom compression

open "compressed.file", "w+" do |compressed_io|
  deflate = Zlib::Deflate.new(Zlib::BEST_COMPRESSION,
                              Zlib::MAX_WBITS,
                              Zlib::MAX_MEM_LEVEL,
                              Zlib::HUFFMAN_ONLY)

  begin
    open "big.file" do |big_io|
      until big_io.eof? do
        compressed_io << zd.deflate(big_io.read(16384))
      end
    end
  ensure
    deflate.close
  end
end

While this example will work, for best optimization review the flags for your specific time, memory usage and output space requirements.

 
               static VALUE
rb_deflate_initialize(int argc, VALUE *argv, VALUE obj)
{
    struct zstream *z;
    VALUE level, wbits, memlevel, strategy;
    int err;

    rb_scan_args(argc, argv, "04", &level, &wbits, &memlevel, &strategy);
    Data_Get_Struct(obj, struct zstream, z);

    err = deflateInit2(&z->stream, ARG_LEVEL(level), Z_DEFLATED,
                       ARG_WBITS(wbits), ARG_MEMLEVEL(memlevel),
                       ARG_STRATEGY(strategy));
    if (err != Z_OK) {
        raise_zlib_error(err, z->stream.msg);
    }
    ZSTREAM_READY(z);

    return obj;
}
            

Public Instance Methods

<< string click to toggle source

Inputs string into the deflate stream just like #deflate, but returns the Zlib::Deflate object itself. The output from the stream is preserved in output buffer.

 
               static VALUE
rb_deflate_addstr(VALUE obj, VALUE src)
{
    OBJ_INFECT(obj, src);
    do_deflate(get_zstream(obj), src, Z_NO_FLUSH);
    return obj;
}
            
deflate(string, flush = Zlib::NO_FLUSH) → String click to toggle source
deflate(string, flush = Zlib::NO_FLUSH) { |chunk| ... } → nil

Inputs string into the deflate stream and returns the output from the stream. On calling this method, both the input and the output buffers of the stream are flushed. If string is nil, this method finishes the stream, just like Zlib::ZStream#finish.

If a block is given consecutive deflated chunks from the string are yielded to the block and nil is returned.

The flush parameter specifies the flush mode. The following constants may be used:

Zlib::NO_FLUSH

The default

Zlib::SYNC_FLUSH

Flushes the output to a byte boundary

Zlib::FULL_FLUSH

SYNC_FLUSH + resets the compression state

Zlib::FINISH

Pending input is processed, pending output is flushed.

See the constants for further description.

 
               static VALUE
rb_deflate_deflate(int argc, VALUE *argv, VALUE obj)
{
    struct zstream *z = get_zstream(obj);
    VALUE src, flush;

    rb_scan_args(argc, argv, "11", &src, &flush);
    OBJ_INFECT(obj, src);
    do_deflate(z, src, ARG_FLUSH(flush));

    return zstream_detach_buffer(z);
}
            
flush(flush = Zlib::SYNC_FLUSH) → String click to toggle source
flush(flush = Zlib::SYNC_FLUSH) { |chunk| ... } → nil

This method is equivalent to deflate('', flush). This method is just provided to improve the readability of your Ruby program. If a block is given chunks of deflate output are yielded to the block until the buffer is flushed.

See #deflate for detail on the flush constants NO_FLUSH, SYNC_FLUSH, FULL_FLUSH and FINISH.

 
               static VALUE
rb_deflate_flush(int argc, VALUE *argv, VALUE obj)
{
    struct zstream *z = get_zstream(obj);
    VALUE v_flush;
    int flush;

    rb_scan_args(argc, argv, "01", &v_flush);
    flush = FIXNUMARG(v_flush, Z_SYNC_FLUSH);
    if (flush != Z_NO_FLUSH) {  /* prevent Z_BUF_ERROR */
        zstream_run(z, (Bytef*)"", 0, flush);
    }

    return zstream_detach_buffer(z);
}
            
initialize_copy(p1) click to toggle source

Duplicates the deflate stream.

 
               static VALUE
rb_deflate_init_copy(VALUE self, VALUE orig)
{
    struct zstream *z1, *z2;
    int err;

    Data_Get_Struct(self, struct zstream, z1);
    z2 = get_zstream(orig);

    if (z1 == z2) return self;
    err = deflateCopy(&z1->stream, &z2->stream);
    if (err != Z_OK) {
        raise_zlib_error(err, 0);
    }
    z1->input = NIL_P(z2->input) ? Qnil : rb_str_dup(z2->input);
    z1->buf   = NIL_P(z2->buf)   ? Qnil : rb_str_dup(z2->buf);
    z1->buf_filled = z2->buf_filled;
    z1->flags = z2->flags;

    return self;
}
            
params(level, strategy) click to toggle source

Changes the parameters of the deflate stream to allow changes between different types of data that require different types of compression. Any unprocessed data is flushed before changing the params.

See ::new for a description of level and strategy.

 
               static VALUE
rb_deflate_params(VALUE obj, VALUE v_level, VALUE v_strategy)
{
    struct zstream *z = get_zstream(obj);
    int level, strategy;
    int err;
    uInt n;

    level = ARG_LEVEL(v_level);
    strategy = ARG_STRATEGY(v_strategy);

    n = z->stream.avail_out;
    err = deflateParams(&z->stream, level, strategy);
    z->buf_filled += n - z->stream.avail_out;
    while (err == Z_BUF_ERROR) {
        rb_warning("deflateParams() returned Z_BUF_ERROR");
        zstream_expand_buffer(z);
        n = z->stream.avail_out;
        err = deflateParams(&z->stream, level, strategy);
        z->buf_filled += n - z->stream.avail_out;
    }
    if (err != Z_OK) {
        raise_zlib_error(err, z->stream.msg);
    }

    return Qnil;
}
            
set_dictionary(string) click to toggle source

Sets the preset dictionary and returns string. This method is available just only after ::new or Zlib::ZStream#reset method was called. See zlib.h for details.

Can raise errors of Z_STREAM_ERROR if a parameter is invalid (such as NULL dictionary) or the stream state is inconsistent, Z_DATA_ERROR if the given dictionary doesn’t match the expected one (incorrect adler32 value)

 
               static VALUE
rb_deflate_set_dictionary(VALUE obj, VALUE dic)
{
    struct zstream *z = get_zstream(obj);
    VALUE src = dic;
    int err;

    OBJ_INFECT(obj, dic);
    StringValue(src);
    err = deflateSetDictionary(&z->stream,
                               (Bytef*)RSTRING_PTR(src), RSTRING_LENINT(src));
    if (err != Z_OK) {
        raise_zlib_error(err, z->stream.msg);
    }

    return dic;
}
            

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