class method
Zlib::GzipReader.new
(::_Reader io, **untyped opts) -> ::Zlib::GzipReader
Zlib::GzipReader.new(io, options = {})
ext/zlib/zlib.c
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static VALUE
rb_gzreader_initialize(int argc, VALUE *argv, VALUE obj)
{
VALUE io, opt = Qnil;
struct gzfile *gz;
int err;
TypedData_Get_Struct(obj, struct gzfile, &gzfile_data_type, gz);
rb_scan_args(argc, argv, "1:", &io, &opt);
/* this is undocumented feature of zlib */
err = inflateInit2(&gz->z.stream, -MAX_WBITS);
if (err != Z_OK) {
raise_zlib_error(err, gz->z.stream.msg);
}
gz->io = io;
ZSTREAM_READY(&gz->z);
gzfile_read_header(gz, Qnil);
rb_gzfile_ecopts(gz, opt);
if (rb_respond_to(io, id_path)) {
/* File#path may raise IOError in case when a path is unavailable */
rb_rescue2(gzfile_initialize_path_partial, obj, NULL, Qnil, rb_eIOError, (VALUE)0);
}
return obj;
}
Creates a GzipReader object associated with io. The GzipReader object reads gzipped data from io, and parses/decompresses it. The io must have a read method that behaves same as the IO#read.
The options hash may be used to set the encoding of the data. :external_encoding, :internal_encoding and :encoding may be set as in IO::new.
If the gzip file header is incorrect, raises an Zlib::GzipFile::Error exception.