class Zlib::GzipFile

Parent:
Object

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.

Method Catalogue

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

Public Class Methods

Zlib::GzipReader.wrap(io, ...) { |gz| ... } Show source
Zlib::GzipWriter.wrap(io, ...) { |gz| ... } 
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.

Public Instance Methods

close() Show source 
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.

closed?() Show source 
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?

comment() Show source 
static VALUE
rb_gzfile_comment(VALUE obj)
{
    VALUE str = get_gzfile(obj)->comment;
    if (!NIL_P(str)) {
        str = rb_str_dup(str);
    }
    return str;
}

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

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

Returns CRC value of the uncompressed data.

finish() Show source 
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.

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

Returns compression level.

mtime() Show source 
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.

orig_name() Show source 
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.

os_code() Show source 
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.

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

Same as IO#sync

sync = flag Show source 
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.

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

Same as IO.

Ruby Core © 1993–2020 Yukihiro Matsumoto
Licensed under the Ruby License.
Ruby Standard Library © contributors
Licensed under their own licenses.