Class: Zstdlib::GzipReader
- Includes:
- Enumerable
- Defined in:
- ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c,
ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c,
ext/zstdlib_c/ruby/zlib-3.2/zstdlib.c,
ext/zstdlib_c/ruby/zlib-3.2/zstdlib.c,
ext/zstdlib_c/ruby/zlib-3.1/zstdlib.c,
ext/zstdlib_c/ruby/zlib-3.1/zstdlib.c,
ext/zstdlib_c/ruby/zlib-3.0/zstdlib.c,
ext/zstdlib_c/ruby/zlib-3.0/zstdlib.c,
ext/zstdlib_c/ruby/zlib-2.7/zstdlib.c,
ext/zstdlib_c/ruby/zlib-2.7/zstdlib.c,
ext/zstdlib_c/ruby/zlib-2.6/zstdlib.c,
ext/zstdlib_c/ruby/zlib-2.6/zstdlib.c,
ext/zstdlib_c/ruby/zlib-2.5/zstdlib.c,
ext/zstdlib_c/ruby/zlib-2.5/zstdlib.c,
ext/zstdlib_c/ruby/zlib-2.4/zstdlib.c,
ext/zstdlib_c/ruby/zlib-2.4/zstdlib.c,
ext/zstdlib_c/ruby/zlib-2.3/zstdlib.c,
ext/zstdlib_c/ruby/zlib-2.3/zstdlib.c,
ext/zstdlib_c/ruby/zlib-2.2/zstdlib.c,
ext/zstdlib_c/ruby/zlib-2.2/zstdlib.c
Overview
Zstdlib::GzipReader is the class for reading a gzipped file. GzipReader should be used an IO, or -IO-like, object.
Zstdlib::GzipReader.open('hoge.gz') {|gz| print gz.read }
File.open('hoge.gz') do |f| gz = Zstdlib::GzipReader.new(f) print gz.read gz.close end
== Method Catalogue
The following methods in Zstdlib::GzipReader are just like their counterparts in IO, but they raise Zstdlib::Error or Zstdlib::GzipFile::Error exception if an error was found in the gzip file.
- #each
- #each_line
- #each_byte
- #gets
- #getc
- #lineno
- #lineno=
- #read
- #readchar
- #readline
- #readlines
- #ungetc
Be careful of the footer of the gzip file. A gzip file has the checksum of pre-compressed data in its footer. GzipReader checks all uncompressed data against that checksum at the following cases, and if it fails, raises Zstdlib::GzipFile::NoFooter, Zstdlib::GzipFile::CRCError, or Zstdlib::GzipFile::LengthError exception.
- When an reading request is received beyond the end of file (the end of compressed data). That is, when Zstdlib::GzipReader#read, Zstdlib::GzipReader#gets, or some other methods for reading returns nil.
- When Zstdlib::GzipFile#close method is called after the object reaches the end of file.
- When Zstdlib::GzipReader#unused method is called after the object reaches the end of file.
The rest of the methods are adequately described in their own documentation.
Class Method Summary collapse
-
.open(*args) ⇒ Object
call-seq: Zstdlib::GzipReader.open(filename) {|gz| ... }.
-
.zcat(*args) ⇒ Object
call-seq: Zstdlib::GzipReader.zcat(io, options = {}, &block) => nil Zstdlib::GzipReader.zcat(io, options = {}) => string.
Instance Method Summary collapse
-
#bytes ⇒ Object
This is a deprecated alias for
each_byte
. -
#each(*args) ⇒ Object
See Zstdlib::GzipReader documentation for a description.
-
#each_byte ⇒ Object
See Zstdlib::GzipReader documentation for a description.
-
#each_char ⇒ Object
See Zstdlib::GzipReader documentation for a description.
-
#each_line(*args) ⇒ Object
See Zstdlib::GzipReader documentation for a description.
-
#eof ⇒ Object
Returns +true+ or +false+ whether the stream has reached the end.
-
#eof? ⇒ Boolean
Returns +true+ or +false+ whether the stream has reached the end.
-
#external_encoding ⇒ Object
See Zstdlib::GzipReader documentation for a description.
-
#getbyte ⇒ Object
See Zstdlib::GzipReader documentation for a description.
-
#getc ⇒ Object
See Zstdlib::GzipReader documentation for a description.
-
#gets(*args) ⇒ Object
See Zstdlib::GzipReader documentation for a description.
-
#initialize(*args) ⇒ Object
constructor
call-seq: Zstdlib::GzipReader.new(io, options = {}).
-
#lineno ⇒ Object
The line number of the last row read from this file.
-
#lineno=(lineno) ⇒ Object
Specify line number of the last row read from this file.
-
#lines(*args) ⇒ Object
This is a deprecated alias for
each_line
. -
#pos ⇒ Object
Total number of output bytes output so far.
-
#read(*args) ⇒ Object
See Zstdlib::GzipReader documentation for a description.
-
#readbyte ⇒ Object
See Zstdlib::GzipReader documentation for a description.
-
#readchar ⇒ Object
See Zstdlib::GzipReader documentation for a description.
-
#readline(*args) ⇒ Object
See Zstdlib::GzipReader documentation for a description.
-
#readlines(*args) ⇒ Object
See Zstdlib::GzipReader documentation for a description.
-
#readpartial(*args) ⇒ Object
call-seq: gzipreader.readpartial(maxlen [, outbuf]) => string, outbuf.
-
#rewind ⇒ Object
Resets the position of the file pointer to the point created the GzipReader object.
-
#tell ⇒ Object
Total number of output bytes output so far.
-
#ungetbyte(ch) ⇒ Object
See Zstdlib::GzipReader documentation for a description.
-
#ungetc(s) ⇒ Object
See Zstdlib::GzipReader documentation for a description.
-
#unused ⇒ Object
Returns the rest of the data which had read for parsing gzip format, or +nil+ if the whole gzip file is not parsed yet.
Methods inherited from GzipFile
#close, #closed?, #comment, #crc, #finish, #level, #mtime, #orig_name, #os_code, #sync, #sync=, #to_io, wrap
Constructor Details
#initialize(*args) ⇒ Object
call-seq: Zstdlib::GzipReader.new(io, options = {})
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 Zstdlib::GzipFile::Error exception.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 3960
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;
}
|
Class Method Details
.open(*args) ⇒ Object
call-seq: Zstdlib::GzipReader.open(filename) {|gz| ... }
Opens a file specified by +filename+ as a gzipped file, and returns a GzipReader object associated with that file. Further details of this method are in Zstdlib::GzipReader.new and ZLib::GzipFile.wrap.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 3883
static VALUE
rb_gzreader_s_open(int argc, VALUE *argv, VALUE klass)
{
return gzfile_s_open(argc, argv, klass, "rb");
}
|
.zcat(*args) ⇒ Object
call-seq: Zstdlib::GzipReader.zcat(io, options = {}, &block) => nil Zstdlib::GzipReader.zcat(io, options = {}) => string
Decompresses all gzip data in the +io+, handling multiple gzip streams until the end of the +io+. There should not be any non-gzip data after the gzip streams.
If a block is given, it is yielded strings of uncompressed data, and the method returns +nil+. If a block is not given, the method returns the concatenation of all uncompressed data in all gzip streams.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 3905
static VALUE
rb_gzreader_s_zcat(int argc, VALUE *argv, VALUE klass)
{
VALUE io, unused, obj, buf=0, tmpbuf;
long pos;
rb_check_arity(argc, 1, 2);
io = argv[0];
do {
obj = rb_funcallv(klass, rb_intern("new"), argc, argv);
if (rb_block_given_p()) {
rb_gzreader_each(0, 0, obj);
}
else {
if (!buf) {
buf = rb_str_new(0, 0);
}
tmpbuf = gzfile_read_all(get_gzfile(obj));
rb_str_cat(buf, RSTRING_PTR(tmpbuf), RSTRING_LEN(tmpbuf));
}
rb_gzreader_read(0, 0, obj);
pos = NUM2LONG(rb_funcall(io, rb_intern("pos"), 0));
unused = rb_gzreader_unused(obj);
rb_gzfile_finish(obj);
if (!NIL_P(unused)) {
pos -= NUM2LONG(rb_funcall(unused, rb_intern("length"), 0));
rb_funcall(io, rb_intern("pos="), 1, LONG2NUM(pos));
}
} while (pos < NUM2LONG(rb_funcall(io, rb_intern("size"), 0)));
if (rb_block_given_p()) {
return Qnil;
}
return buf;
}
|
Instance Method Details
#bytes ⇒ Object
This is a deprecated alias for each_byte
.
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# File 'ext/zstdlib_c/ruby/zlib-2.7/zstdlib.c', line 3971
static VALUE
rb_gzreader_bytes(VALUE obj)
{
rb_warn("Zstdlib::GzipReader#bytes is deprecated; use #each_byte instead");
if (!rb_block_given_p())
return rb_enumeratorize(obj, ID2SYM(rb_intern("each_byte")), 0, 0);
return rb_gzreader_each_byte(obj);
}
|
#each(*args) ⇒ Object
See Zstdlib::GzipReader documentation for a description.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 4430
static VALUE
rb_gzreader_each(int argc, VALUE *argv, VALUE obj)
{
VALUE str;
RETURN_ENUMERATOR(obj, 0, 0);
while (!NIL_P(str = gzreader_gets(argc, argv, obj))) {
rb_yield(str);
}
return obj;
}
|
#each_byte ⇒ Object
See Zstdlib::GzipReader documentation for a description.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 4156
static VALUE
rb_gzreader_each_byte(VALUE obj)
{
VALUE c;
RETURN_ENUMERATOR(obj, 0, 0);
while (!NIL_P(c = rb_gzreader_getbyte(obj))) {
rb_yield(c);
}
return Qnil;
}
|
#each_char ⇒ Object
See Zstdlib::GzipReader documentation for a description.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 4138
static VALUE
rb_gzreader_each_char(VALUE obj)
{
VALUE c;
RETURN_ENUMERATOR(obj, 0, 0);
while (!NIL_P(c = rb_gzreader_getc(obj))) {
rb_yield(c);
}
return Qnil;
}
|
#each_line(*args) ⇒ Object
See Zstdlib::GzipReader documentation for a description.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 4430
static VALUE
rb_gzreader_each(int argc, VALUE *argv, VALUE obj)
{
VALUE str;
RETURN_ENUMERATOR(obj, 0, 0);
while (!NIL_P(str = gzreader_gets(argc, argv, obj))) {
rb_yield(str);
}
return obj;
}
|
#eof ⇒ Object
Returns +true+ or +false+ whether the stream has reached the end.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 3513
static VALUE
rb_gzfile_eof_p(VALUE obj)
{
struct gzfile *gz = get_gzfile(obj);
return GZFILE_IS_FINISHED(gz) ? Qtrue : Qfalse;
}
|
#eof? ⇒ Boolean
Returns +true+ or +false+ whether the stream has reached the end.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 3513
static VALUE
rb_gzfile_eof_p(VALUE obj)
{
struct gzfile *gz = get_gzfile(obj);
return GZFILE_IS_FINISHED(gz) ? Qtrue : Qfalse;
}
|
#external_encoding ⇒ Object
See Zstdlib::GzipReader documentation for a description.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 4464
static VALUE
rb_gzreader_external_encoding(VALUE self)
{
return rb_enc_from_encoding(get_gzfile(self)->enc);
}
|
#getbyte ⇒ Object
See Zstdlib::GzipReader documentation for a description.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 4104
static VALUE
rb_gzreader_getbyte(VALUE obj)
{
struct gzfile *gz = get_gzfile(obj);
VALUE dst;
dst = gzfile_read(gz, 1);
if (!NIL_P(dst)) {
dst = INT2FIX((unsigned int)(RSTRING_PTR(dst)[0]) & 0xff);
}
return dst;
}
|
#getc ⇒ Object
See Zstdlib::GzipReader documentation for a description.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 4075
static VALUE
rb_gzreader_getc(VALUE obj)
{
struct gzfile *gz = get_gzfile(obj);
return gzfile_getc(gz);
}
|
#gets(*args) ⇒ Object
See Zstdlib::GzipReader documentation for a description.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 4398
static VALUE
rb_gzreader_gets(int argc, VALUE *argv, VALUE obj)
{
VALUE dst;
dst = gzreader_gets(argc, argv, obj);
if (!NIL_P(dst)) {
rb_lastline_set(dst);
}
return dst;
}
|
#lineno ⇒ Object
The line number of the last row read from this file.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 3352
static VALUE
rb_gzfile_lineno(VALUE obj)
{
return INT2NUM(get_gzfile(obj)->lineno);
}
|
#lineno=(lineno) ⇒ Object
Specify line number of the last row read from this file.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 3363
static VALUE
rb_gzfile_set_lineno(VALUE obj, VALUE lineno)
{
struct gzfile *gz = get_gzfile(obj);
gz->lineno = NUM2INT(lineno);
return lineno;
}
|
#lines(*args) ⇒ Object
This is a deprecated alias for each_line
.
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# File 'ext/zstdlib_c/ruby/zlib-2.7/zstdlib.c', line 4257
static VALUE
rb_gzreader_lines(int argc, VALUE *argv, VALUE obj)
{
rb_warn("Zstdlib::GzipReader#lines is deprecated; use #each_line instead");
if (!rb_block_given_p())
return rb_enumeratorize(obj, ID2SYM(rb_intern("each_line")), argc, argv);
return rb_gzreader_each(argc, argv, obj);
}
|
#pos ⇒ Object
Total number of output bytes output so far.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 3571
static VALUE
rb_gzfile_total_out(VALUE obj)
{
struct gzfile *gz = get_gzfile(obj);
uLong total_out = gz->z.stream.total_out;
long buf_filled = ZSTREAM_BUF_FILLED(&gz->z);
if (total_out >= (uLong)buf_filled) {
return rb_uint2inum(total_out - buf_filled);
} else {
return LONG2FIX(-(buf_filled - (long)total_out));
}
}
|
#read(*args) ⇒ Object
See Zstdlib::GzipReader documentation for a description.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 4021
static VALUE
rb_gzreader_read(int argc, VALUE *argv, VALUE obj)
{
struct gzfile *gz = get_gzfile(obj);
VALUE vlen;
long len;
rb_scan_args(argc, argv, "01", &vlen);
if (NIL_P(vlen)) {
return gzfile_read_all(gz);
}
len = NUM2INT(vlen);
if (len < 0) {
rb_raise(rb_eArgError, "negative length %ld given", len);
}
return gzfile_read(gz, len);
}
|
#readbyte ⇒ Object
See Zstdlib::GzipReader documentation for a description.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 4122
static VALUE
rb_gzreader_readbyte(VALUE obj)
{
VALUE dst;
dst = rb_gzreader_getbyte(obj);
if (NIL_P(dst)) {
rb_raise(rb_eEOFError, "end of file reached");
}
return dst;
}
|
#readchar ⇒ Object
See Zstdlib::GzipReader documentation for a description.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 4088
static VALUE
rb_gzreader_readchar(VALUE obj)
{
VALUE dst;
dst = rb_gzreader_getc(obj);
if (NIL_P(dst)) {
rb_raise(rb_eEOFError, "end of file reached");
}
return dst;
}
|
#readline(*args) ⇒ Object
See Zstdlib::GzipReader documentation for a description.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 4414
static VALUE
rb_gzreader_readline(int argc, VALUE *argv, VALUE obj)
{
VALUE dst;
dst = rb_gzreader_gets(argc, argv, obj);
if (NIL_P(dst)) {
rb_raise(rb_eEOFError, "end of file reached");
}
return dst;
}
|
#readlines(*args) ⇒ Object
See Zstdlib::GzipReader documentation for a description.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 4448
static VALUE
rb_gzreader_readlines(int argc, VALUE *argv, VALUE obj)
{
VALUE str, dst;
dst = rb_ary_new();
while (!NIL_P(str = gzreader_gets(argc, argv, obj))) {
rb_ary_push(dst, str);
}
return dst;
}
|
#readpartial(*args) ⇒ Object
call-seq: gzipreader.readpartial(maxlen [, outbuf]) => string, outbuf
Reads at most maxlen bytes from the gziped stream but
it blocks only if gzipreader has no data immediately available.
If the optional outbuf argument is present,
it must reference a String, which will receive the data.
It raises EOFError
on end of file.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 4052
static VALUE
rb_gzreader_readpartial(int argc, VALUE *argv, VALUE obj)
{
struct gzfile *gz = get_gzfile(obj);
VALUE vlen, outbuf;
long len;
rb_scan_args(argc, argv, "11", &vlen, &outbuf);
len = NUM2INT(vlen);
if (len < 0) {
rb_raise(rb_eArgError, "negative length %ld given", len);
}
if (!NIL_P(outbuf))
Check_Type(outbuf, T_STRING);
return gzfile_readpartial(gz, len, outbuf);
}
|
#rewind ⇒ Object
Resets the position of the file pointer to the point created the GzipReader object. The associated IO object needs to respond to the +seek+ method.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 3994
static VALUE
rb_gzreader_rewind(VALUE obj)
{
struct gzfile *gz = get_gzfile(obj);
gzfile_reader_rewind(gz);
return INT2FIX(0);
}
|
#tell ⇒ Object
Total number of output bytes output so far.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 3571
static VALUE
rb_gzfile_total_out(VALUE obj)
{
struct gzfile *gz = get_gzfile(obj);
uLong total_out = gz->z.stream.total_out;
long buf_filled = ZSTREAM_BUF_FILLED(&gz->z);
if (total_out >= (uLong)buf_filled) {
return rb_uint2inum(total_out - buf_filled);
} else {
return LONG2FIX(-(buf_filled - (long)total_out));
}
}
|
#ungetbyte(ch) ⇒ Object
See Zstdlib::GzipReader documentation for a description.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 4196
static VALUE
rb_gzreader_ungetbyte(VALUE obj, VALUE ch)
{
struct gzfile *gz = get_gzfile(obj);
gzfile_ungetbyte(gz, NUM2CHR(ch));
return Qnil;
}
|
#ungetc(s) ⇒ Object
See Zstdlib::GzipReader documentation for a description.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 4174
static VALUE
rb_gzreader_ungetc(VALUE obj, VALUE s)
{
struct gzfile *gz;
if (FIXNUM_P(s))
return rb_gzreader_ungetbyte(obj, s);
gz = get_gzfile(obj);
StringValue(s);
if (gz->enc2 && gz->enc2 != rb_ascii8bit_encoding()) {
s = rb_str_conv_enc(s, rb_enc_get(s), gz->enc2);
}
gzfile_ungets(gz, (const Bytef*)RSTRING_PTR(s), RSTRING_LEN(s));
RB_GC_GUARD(s);
return Qnil;
}
|
#unused ⇒ Object
Returns the rest of the data which had read for parsing gzip format, or +nil+ if the whole gzip file is not parsed yet.
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# File 'ext/zstdlib_c/ruby/zlib-3.3/zstdlib.c', line 4008
static VALUE
rb_gzreader_unused(VALUE obj)
{
struct gzfile *gz;
TypedData_Get_Struct(obj, struct gzfile, &gzfile_data_type, gz);
return gzfile_reader_get_unused(gz);
}
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