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Showing content from https://docs.ruby-lang.org/en/3.4/Zlib/GzipFile.html below:

class Zlib::GzipFile - Documentation for Ruby 3.4

1. Zlib::
2. GzipFile

Zlib::GzipFile is an abstract class for handling a gzip formatted compressed file. The operations are defined in the subclasses, Zlib::GzipReader for reading, and Zlib::GzipWriter for writing.

GzipReader should be used by associating an IO, or IO-like, object.

• ::wrap

• ::open (Zlib::GzipReader::open and Zlib::GzipWriter::open)

• close

• closed?

• comment

• comment= (Zlib::GzipWriter#comment=)

• crc

• eof? (Zlib::GzipReader#eof?)

• finish

• level

• lineno (Zlib::GzipReader#lineno)

• lineno= (Zlib::GzipReader#lineno=)

• mtime

• mtime= (Zlib::GzipWriter#mtime=)

• orig_name

• orig_name (Zlib::GzipWriter#orig_name=)

• os_code

• path (when the underlying IO supports path)

• sync

• sync=

• to_io

(due to internal structure, documentation may appear under Zlib::GzipReader or Zlib::GzipWriter)

static VALUE
rb_gzfile_s_wrap(int argc, VALUE *argv, VALUE klass)
{
    return gzfile_wrap(argc, argv, klass, 0);
}

Creates a GzipReader or GzipWriter associated with io, passing in any necessary extra options, and executes the block with the newly created object just like File.open.

The GzipFile object will be closed automatically after executing the block. If you want to keep the associated IO object open, you may call Zlib::GzipFile#finish method in the block.

static VALUE
rb_gzfile_close(VALUE obj)
{
    struct gzfile *gz;
    VALUE io;

    TypedData_Get_Struct(obj, struct gzfile, &gzfile_data_type, gz);
    if (!ZSTREAM_IS_READY(&gz->z)) {
        return Qnil;
    }
    io = gz->io;
    gzfile_close(gz, 1);
    return io;
}

Closes the GzipFile object. This method calls close method of the associated IO object. Returns the associated IO object.

static VALUE
rb_gzfile_closed_p(VALUE obj)
{
    struct gzfile *gz;
    TypedData_Get_Struct(obj, struct gzfile, &gzfile_data_type, gz);
    return NIL_P(gz->io) ? Qtrue : Qfalse;
}

Same as IO#closed?

static VALUE
rb_gzfile_crc(VALUE obj)
{
    return rb_uint2inum(get_gzfile(obj)->crc);
}

Returns CRC value of the uncompressed data.

static VALUE
rb_gzfile_finish(VALUE obj)
{
    struct gzfile *gz = get_gzfile(obj);
    VALUE io;

    io = gz->io;
    gzfile_close(gz, 0);
    return io;
}

Closes the GzipFile object. Unlike Zlib::GzipFile#close, this method never calls the close method of the associated IO object. Returns the associated IO object.

static VALUE
rb_gzfile_level(VALUE obj)
{
    return INT2FIX(get_gzfile(obj)->level);
}

Returns compression level.

static VALUE
rb_gzfile_mtime(VALUE obj)
{
    return rb_time_new(get_gzfile(obj)->mtime, (time_t)0);
}

Returns last modification time recorded in the gzip file header.

static VALUE
rb_gzfile_orig_name(VALUE obj)
{
    VALUE str = get_gzfile(obj)->orig_name;
    if (!NIL_P(str)) {
        str = rb_str_dup(str);
    }
    return str;
}

Returns original filename recorded in the gzip file header, or nil if original filename is not present.

static VALUE
rb_gzfile_os_code(VALUE obj)
{
    return INT2FIX(get_gzfile(obj)->os_code);
}

Returns OS code number recorded in the gzip file header.

static VALUE
rb_gzfile_sync(VALUE obj)
{
    return (get_gzfile(obj)->z.flags & GZFILE_FLAG_SYNC) ? Qtrue : Qfalse;
}

Same as IO#sync

static VALUE
rb_gzfile_set_sync(VALUE obj, VALUE mode)
{
    struct gzfile *gz = get_gzfile(obj);

    if (RTEST(mode)) {
        gz->z.flags |= GZFILE_FLAG_SYNC;
    }
    else {
        gz->z.flags &= ~GZFILE_FLAG_SYNC;
    }
    return mode;
}

Same as IO. If flag is true, the associated IO object must respond to the flush method. While sync mode is true, the compression ratio decreases sharply.

static VALUE
rb_gzfile_to_io(VALUE obj)
{
    return get_gzfile(obj)->io;
}

Same as IO.

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