Class: Zlib::GzipReader
- Includes:
- Enumerable
- Defined in:
- ext/rubysl/zlib/zlib.c,
ext/rubysl/zlib/zlib.c
Overview
Zlib::GzipReader is the class for reading a gzipped file. GzipReader should be used an IO, or -IO-lie, object.
Zlib::GzipReader.open('hoge.gz') {|gz|
print gz.read
}
File.open('hoge.gz') do |f|
gz = Zlib::GzipReader.new(f)
print gz.read
gz.close
end
# TODO: test these. Are they equivalent? Can GzipReader.new take a
# block?
Method Catalogue
The following methods in Zlib::GzipReader are just like their counterparts in IO, but they raise Zlib::Error or Zlib::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 Zlib::GzipFile::NoFooter
, Zlib::GzipFile::CRCError
, or Zlib::GzipFile::LengthError
exception.
-
When an reading request is received beyond the end of file (the end of compressed data). That is, when Zlib::GzipReader#read, Zlib::GzipReader#gets, or some other methods for reading returns nil.
-
When Zlib::GzipFile#close method is called after the object reaches the end of file.
-
When Zlib::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
-
.Zlib::GzipReader.open(filename) {|gz| ... } ⇒ Object
Opens a file specified by
filename
as a gzipped file, and returns a GzipReader object associated with that file.
Instance Method Summary collapse
-
#each ⇒ Object
See Zlib::GzipReader documentation for a description.
-
#each_byte ⇒ Object
See Zlib::GzipReader documentation for a description.
-
#each_line ⇒ Object
See Zlib::GzipReader documentation for a description.
-
#eof ⇒ Object
???.
-
#eof? ⇒ Boolean
???.
-
#getc ⇒ Object
See Zlib::GzipReader documentation for a description.
-
#gets ⇒ Object
See Zlib::GzipReader documentation for a description.
-
#Zlib::GzipReader.new(io) ⇒ Object
constructor
Creates a GzipReader object associated with
io
. -
#lineno ⇒ Object
???.
-
#lineno= ⇒ Object
???.
-
#pos ⇒ Object
???.
-
#read ⇒ Object
See Zlib::GzipReader documentation for a description.
-
#readchar ⇒ Object
See Zlib::GzipReader documentation for a description.
-
#readline ⇒ Object
See Zlib::GzipReader documentation for a description.
-
#readlines ⇒ Object
See Zlib::GzipReader documentation for a description.
-
#rewind ⇒ Object
Resets the position of the file pointer to the point created the GzipReader object.
-
#tell ⇒ Object
???.
-
#ungetc ⇒ Object
See Zlib::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
#Zlib::GzipReader.new(io) ⇒ Object
Creates a GzipReader object associated with io
. The GzipReader object reads gzipped data from io
, and parses/decompresses them. At least, io
must have a read
method that behaves same as the read
method in IO class.
If the gzip file header is incorrect, raises an Zlib::GzipFile::Error exception.
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# File 'ext/rubysl/zlib/zlib.c', line 2929 static VALUE rb_gzreader_initialize(obj, io) VALUE obj, io; |
Class Method Details
.Zlib::GzipReader.open(filename) {|gz| ... } ⇒ Object
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 Zlib::GzipReader.new and ZLib::GzipReader.wrap.
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# File 'ext/rubysl/zlib/zlib.c', line 2910 static VALUE rb_gzreader_s_open(argc, argv, klass) int argc; |
Instance Method Details
#each ⇒ Object
See Zlib::GzipReader documentation for a description.
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# File 'ext/rubysl/zlib/zlib.c', line 3220 static VALUE rb_gzreader_each(argc, argv, obj) int argc; |
#each_byte ⇒ Object
See Zlib::GzipReader documentation for a description.
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# File 'ext/rubysl/zlib/zlib.c', line 3036 static VALUE rb_gzreader_each_byte(obj) VALUE obj; |
#each_line ⇒ Object
See Zlib::GzipReader documentation for a description.
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# File 'ext/rubysl/zlib/zlib.c', line 3220 static VALUE rb_gzreader_each(argc, argv, obj) int argc; |
#eof ⇒ Object
???
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# File 'ext/rubysl/zlib/zlib.c', line 2606 static VALUE rb_gzfile_eof_p(obj) VALUE obj; |
#eof? ⇒ Boolean
???
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# File 'ext/rubysl/zlib/zlib.c', line 2606 static VALUE rb_gzfile_eof_p(obj) VALUE obj; |
#getc ⇒ Object
See Zlib::GzipReader documentation for a description.
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# File 'ext/rubysl/zlib/zlib.c', line 3004 static VALUE rb_gzreader_getc(obj) VALUE obj; |
#gets ⇒ Object
See Zlib::GzipReader documentation for a description.
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# File 'ext/rubysl/zlib/zlib.c', line 3186 static VALUE rb_gzreader_gets(argc, argv, obj) int argc; |
#lineno ⇒ Object
???
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# File 'ext/rubysl/zlib/zlib.c', line 2469 static VALUE rb_gzfile_lineno(obj) VALUE obj; |
#lineno= ⇒ Object
???
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# File 'ext/rubysl/zlib/zlib.c', line 2479 static VALUE rb_gzfile_set_lineno(obj, lineno) VALUE obj, lineno; |
#pos ⇒ Object
???
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# File 'ext/rubysl/zlib/zlib.c', line 2659 static VALUE rb_gzfile_total_out(obj) VALUE obj; |
#read ⇒ Object
See Zlib::GzipReader documentation for a description.
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# File 'ext/rubysl/zlib/zlib.c', line 2979 static VALUE rb_gzreader_read(argc, argv, obj) int argc; |
#readchar ⇒ Object
See Zlib::GzipReader documentation for a description.
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# File 'ext/rubysl/zlib/zlib.c', line 3021 static VALUE rb_gzreader_readchar(obj) VALUE obj; |
#readline ⇒ Object
See Zlib::GzipReader documentation for a description.
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# File 'ext/rubysl/zlib/zlib.c', line 3203 static VALUE rb_gzreader_readline(argc, argv, obj) int argc; |
#readlines ⇒ Object
See Zlib::GzipReader documentation for a description.
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# File 'ext/rubysl/zlib/zlib.c', line 3236 static VALUE rb_gzreader_readlines(argc, argv, obj) int argc; |
#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/rubysl/zlib/zlib.c', line 2954 static VALUE rb_gzreader_rewind(obj) VALUE obj; |
#tell ⇒ Object
???
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# File 'ext/rubysl/zlib/zlib.c', line 2659 static VALUE rb_gzfile_total_out(obj) VALUE obj; |
#ungetc ⇒ Object
See Zlib::GzipReader documentation for a description.
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# File 'ext/rubysl/zlib/zlib.c', line 3050 static VALUE rb_gzreader_ungetc(obj, ch) VALUE obj, ch; |
#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/rubysl/zlib/zlib.c', line 2967 static VALUE rb_gzreader_unused(obj) VALUE obj; |