compress: add available godoc link

Change-Id: Ia6e88aec59cb294e8b303a00fcd69f4cbf0dc09a
Reviewed-on: https://go-review.googlesource.com/c/go/+/534759
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Run-TryBot: shuang cui <imcusg@gmail.com>

src/compress/bzip2/bit_reader.go

@@ -32,7 +32,7 @@ func newBitReader(r io.Reader) bitReader {
 
 // ReadBits64 reads the given number of bits and returns them in the
 // least-significant part of a uint64. In the event of an error, it returns 0
-// and the error can be obtained by calling Err().
+// and the error can be obtained by calling [bitReader.Err]().
 func (br *bitReader) ReadBits64(bits uint) (n uint64) {
 	for bits > br.bits {
 		b, err := br.r.ReadByte()

src/compress/flate/deflate.go

@@ -650,13 +650,13 @@ func (d *compressor) close() error {
 	return nil
 }
 
-// NewWriter returns a new Writer compressing data at the given level.
-// Following zlib, levels range from 1 (BestSpeed) to 9 (BestCompression);
+// NewWriter returns a new [Writer] compressing data at the given level.
+// Following zlib, levels range from 1 ([BestSpeed]) to 9 ([BestCompression]);
 // higher levels typically run slower but compress more. Level 0
-// (NoCompression) does not attempt any compression; it only adds the
+// ([NoCompression]) does not attempt any compression; it only adds the
 // necessary DEFLATE framing.
-// Level -1 (DefaultCompression) uses the default compression level.
-// Level -2 (HuffmanOnly) will use Huffman compression only, giving
+// Level -1 ([DefaultCompression]) uses the default compression level.
+// Level -2 ([HuffmanOnly]) will use Huffman compression only, giving
 // a very fast compression for all types of input, but sacrificing considerable
 // compression efficiency.
 //
@@ -670,11 +670,11 @@ func NewWriter(w io.Writer, level int) (*Writer, error) {
 	return &dw, nil
 }
 
-// NewWriterDict is like NewWriter but initializes the new
-// Writer with a preset dictionary. The returned Writer behaves
+// NewWriterDict is like [NewWriter] but initializes the new
+// [Writer] with a preset dictionary. The returned [Writer] behaves
 // as if the dictionary had been written to it without producing
 // any compressed output. The compressed data written to w
-// can only be decompressed by a Reader initialized with the
+// can only be decompressed by a [Reader] initialized with the
 // same dictionary.
 func NewWriterDict(w io.Writer, level int, dict []byte) (*Writer, error) {
 	dw := &dictWriter{w}
@@ -698,7 +698,7 @@ func (w *dictWriter) Write(b []byte) (n int, err error) {
 var errWriterClosed = errors.New("flate: closed writer")
 
 // A Writer takes data written to it and writes the compressed
-// form of that data to an underlying writer (see NewWriter).
+// form of that data to an underlying writer (see [NewWriter]).
 type Writer struct {
 	d    compressor
 	dict []byte
@@ -714,7 +714,7 @@ func (w *Writer) Write(data []byte) (n int, err error) {
 // It is useful mainly in compressed network protocols, to ensure that
 // a remote reader has enough data to reconstruct a packet.
 // Flush does not return until the data has been written.
-// Calling Flush when there is no pending data still causes the Writer
+// Calling Flush when there is no pending data still causes the [Writer]
 // to emit a sync marker of at least 4 bytes.
 // If the underlying writer returns an error, Flush returns that error.
 //
@@ -731,7 +731,7 @@ func (w *Writer) Close() error {
 }
 
 // Reset discards the writer's state and makes it equivalent to
-// the result of NewWriter or NewWriterDict called with dst
+// the result of [NewWriter] or [NewWriterDict] called with dst
 // and w's level and dictionary.
 func (w *Writer) Reset(dst io.Writer) {
 	if dw, ok := w.d.w.writer.(*dictWriter); ok {

src/compress/flate/inflate.go

@@ -65,8 +65,8 @@ func (e *WriteError) Error() string {
 	return "flate: write error at offset " + strconv.FormatInt(e.Offset, 10) + ": " + e.Err.Error()
 }
 
-// Resetter resets a ReadCloser returned by NewReader or NewReaderDict
-// to switch to a new underlying Reader. This permits reusing a ReadCloser
+// Resetter resets a ReadCloser returned by [NewReader] or [NewReaderDict]
+// to switch to a new underlying [Reader]. This permits reusing a ReadCloser
 // instead of allocating a new one.
 type Resetter interface {
 	// Reset discards any buffered data and resets the Resetter as if it was
@@ -255,9 +255,9 @@ func (h *huffmanDecoder) init(lengths []int) bool {
 	return true
 }
 
-// The actual read interface needed by NewReader.
+// The actual read interface needed by [NewReader].
 // If the passed in io.Reader does not also have ReadByte,
-// the NewReader will introduce its own buffering.
+// the [NewReader] will introduce its own buffering.
 type Reader interface {
 	io.Reader
 	io.ByteReader
@@ -800,10 +800,10 @@ func (f *decompressor) Reset(r io.Reader, dict []byte) error {
 // to read the uncompressed version of r.
 // If r does not also implement [io.ByteReader],
 // the decompressor may read more data than necessary from r.
-// The reader returns io.EOF after the final block in the DEFLATE stream has
+// The reader returns [io.EOF] after the final block in the DEFLATE stream has
 // been encountered. Any trailing data after the final block is ignored.
 //
-// The ReadCloser returned by NewReader also implements Resetter.
+// The ReadCloser returned by NewReader also implements [Resetter].
 func NewReader(r io.Reader) io.ReadCloser {
 	fixedHuffmanDecoderInit()
 
@@ -816,13 +816,13 @@ func NewReader(r io.Reader) io.ReadCloser {
 	return &f
 }
 
-// NewReaderDict is like NewReader but initializes the reader
-// with a preset dictionary. The returned Reader behaves as if
+// NewReaderDict is like [NewReader] but initializes the reader
+// with a preset dictionary. The returned [Reader] behaves as if
 // the uncompressed data stream started with the given dictionary,
 // which has already been read. NewReaderDict is typically used
 // to read data compressed by NewWriterDict.
 //
-// The ReadCloser returned by NewReader also implements Resetter.
+// The ReadCloser returned by NewReaderDict also implements [Resetter].
 func NewReaderDict(r io.Reader, dict []byte) io.ReadCloser {
 	fixedHuffmanDecoderInit()
 

src/compress/gzip/gunzip.go

@@ -45,7 +45,7 @@ func noEOF(err error) error {
 }
 
 // The gzip file stores a header giving metadata about the compressed file.
-// That header is exposed as the fields of the Writer and Reader structs.
+// That header is exposed as the fields of the [Writer] and [Reader] structs.
 //
 // Strings must be UTF-8 encoded and may only contain Unicode code points
 // U+0001 through U+00FF, due to limitations of the GZIP file format.
@@ -57,7 +57,7 @@ type Header struct {
 	OS      byte      // operating system type
 }
 
-// A Reader is an io.Reader that can be read to retrieve
+// A Reader is an [io.Reader] that can be read to retrieve
 // uncompressed data from a gzip-format compressed file.
 //
 // In general, a gzip file can be a concatenation of gzip files,
@@ -66,10 +66,10 @@ type Header struct {
 // Only the first header is recorded in the Reader fields.
 //
 // Gzip files store a length and checksum of the uncompressed data.
-// The Reader will return an ErrChecksum when Read
+// The Reader will return an [ErrChecksum] when [Reader.Read]
 // reaches the end of the uncompressed data if it does not
 // have the expected length or checksum. Clients should treat data
-// returned by Read as tentative until they receive the io.EOF
+// returned by [Reader.Read] as tentative until they receive the [io.EOF]
 // marking the end of the data.
 type Reader struct {
 	Header       // valid after NewReader or Reader.Reset
@@ -82,13 +82,13 @@ type Reader struct {
 	multistream  bool
 }
 
-// NewReader creates a new Reader reading the given reader.
+// NewReader creates a new [Reader] reading the given reader.
 // If r does not also implement [io.ByteReader],
 // the decompressor may read more data than necessary from r.
 //
-// It is the caller's responsibility to call Close on the Reader when done.
+// It is the caller's responsibility to call Close on the [Reader] when done.
 //
-// The Reader.Header fields will be valid in the Reader returned.
+// The Reader.Header fields will be valid in the [Reader] returned.
 func NewReader(r io.Reader) (*Reader, error) {
 	z := new(Reader)
 	if err := z.Reset(r); err != nil {
@@ -97,9 +97,9 @@ func NewReader(r io.Reader) (*Reader, error) {
 	return z, nil
 }
 
-// Reset discards the Reader z's state and makes it equivalent to the
-// result of its original state from NewReader, but reading from r instead.
-// This permits reusing a Reader rather than allocating a new one.
+// Reset discards the [Reader] z's state and makes it equivalent to the
+// result of its original state from [NewReader], but reading from r instead.
+// This permits reusing a [Reader] rather than allocating a new one.
 func (z *Reader) Reset(r io.Reader) error {
 	*z = Reader{
 		decompressor: z.decompressor,
@@ -116,7 +116,7 @@ func (z *Reader) Reset(r io.Reader) error {
 
 // Multistream controls whether the reader supports multistream files.
 //
-// If enabled (the default), the Reader expects the input to be a sequence
+// If enabled (the default), the [Reader] expects the input to be a sequence
 // of individually gzipped data streams, each with its own header and
 // trailer, ending at EOF. The effect is that the concatenation of a sequence
 // of gzipped files is treated as equivalent to the gzip of the concatenation
@@ -125,11 +125,11 @@ func (z *Reader) Reset(r io.Reader) error {
 // Calling Multistream(false) disables this behavior; disabling the behavior
 // can be useful when reading file formats that distinguish individual gzip
 // data streams or mix gzip data streams with other data streams.
-// In this mode, when the Reader reaches the end of the data stream,
-// Read returns io.EOF. The underlying reader must implement io.ByteReader
+// In this mode, when the [Reader] reaches the end of the data stream,
+// [Reader.Read] returns [io.EOF]. The underlying reader must implement [io.ByteReader]
 // in order to be left positioned just after the gzip stream.
 // To start the next stream, call z.Reset(r) followed by z.Multistream(false).
-// If there is no next stream, z.Reset(r) will return io.EOF.
+// If there is no next stream, z.Reset(r) will return [io.EOF].
 func (z *Reader) Multistream(ok bool) {
 	z.multistream = ok
 }
@@ -242,7 +242,7 @@ func (z *Reader) readHeader() (hdr Header, err error) {
 	return hdr, nil
 }
 
-// Read implements io.Reader, reading uncompressed bytes from its underlying Reader.
+// Read implements [io.Reader], reading uncompressed bytes from its underlying [Reader].
 func (z *Reader) Read(p []byte) (n int, err error) {
 	if z.err != nil {
 		return 0, z.err
@@ -284,7 +284,7 @@ func (z *Reader) Read(p []byte) (n int, err error) {
 	return n, nil
 }
 
-// Close closes the Reader. It does not close the underlying io.Reader.
+// Close closes the [Reader]. It does not close the underlying [io.Reader].
 // In order for the GZIP checksum to be verified, the reader must be
-// fully consumed until the io.EOF.
+// fully consumed until the [io.EOF].
 func (z *Reader) Close() error { return z.decompressor.Close() }

src/compress/gzip/gzip.go

@@ -38,10 +38,10 @@ type Writer struct {
 	err         error
 }
 
-// NewWriter returns a new Writer.
+// NewWriter returns a new [Writer].
 // Writes to the returned writer are compressed and written to w.
 //
-// It is the caller's responsibility to call Close on the Writer when done.
+// It is the caller's responsibility to call Close on the [Writer] when done.
 // Writes may be buffered and not flushed until Close.
 //
 // Callers that wish to set the fields in Writer.Header must do so before
@@ -51,11 +51,11 @@ func NewWriter(w io.Writer) *Writer {
 	return z
 }
 
-// NewWriterLevel is like NewWriter but specifies the compression level instead
-// of assuming DefaultCompression.
+// NewWriterLevel is like [NewWriter] but specifies the compression level instead
+// of assuming [DefaultCompression].
 //
-// The compression level can be DefaultCompression, NoCompression, HuffmanOnly
-// or any integer value between BestSpeed and BestCompression inclusive.
+// The compression level can be [DefaultCompression], [NoCompression], [HuffmanOnly]
+// or any integer value between [BestSpeed] and [BestCompression] inclusive.
 // The error returned will be nil if the level is valid.
 func NewWriterLevel(w io.Writer, level int) (*Writer, error) {
 	if level < HuffmanOnly || level > BestCompression {
@@ -81,9 +81,9 @@ func (z *Writer) init(w io.Writer, level int) {
 	}
 }
 
-// Reset discards the Writer z's state and makes it equivalent to the
-// result of its original state from NewWriter or NewWriterLevel, but
-// writing to w instead. This permits reusing a Writer rather than
+// Reset discards the [Writer] z's state and makes it equivalent to the
+// result of its original state from [NewWriter] or [NewWriterLevel], but
+// writing to w instead. This permits reusing a [Writer] rather than
 // allocating a new one.
 func (z *Writer) Reset(w io.Writer) {
 	z.init(w, z.level)
@@ -134,8 +134,8 @@ func (z *Writer) writeString(s string) (err error) {
 	return err
 }
 
-// Write writes a compressed form of p to the underlying io.Writer. The
-// compressed bytes are not necessarily flushed until the Writer is closed.
+// Write writes a compressed form of p to the underlying [io.Writer]. The
+// compressed bytes are not necessarily flushed until the [Writer] is closed.
 func (z *Writer) Write(p []byte) (int, error) {
 	if z.err != nil {
 		return 0, z.err
@@ -222,9 +222,9 @@ func (z *Writer) Flush() error {
 	return z.err
 }
 
-// Close closes the Writer by flushing any unwritten data to the underlying
-// io.Writer and writing the GZIP footer.
-// It does not close the underlying io.Writer.
+// Close closes the [Writer] by flushing any unwritten data to the underlying
+// [io.Writer] and writing the GZIP footer.
+// It does not close the underlying [io.Writer].
 func (z *Writer) Close() error {
 	if z.err != nil {
 		return z.err

src/compress/lzw/reader.go

@@ -118,7 +118,7 @@ func (r *Reader) readMSB() (uint16, error) {
 	return code, nil
 }
 
-// Read implements io.Reader, reading uncompressed bytes from its underlying Reader.
+// Read implements io.Reader, reading uncompressed bytes from its underlying [Reader].
 func (r *Reader) Read(b []byte) (int, error) {
 	for {
 		if len(r.toRead) > 0 {
@@ -225,22 +225,22 @@ loop:
 
 var errClosed = errors.New("lzw: reader/writer is closed")
 
-// Close closes the Reader and returns an error for any future read operation.
-// It does not close the underlying io.Reader.
+// Close closes the [Reader] and returns an error for any future read operation.
+// It does not close the underlying [io.Reader].
 func (r *Reader) Close() error {
 	r.err = errClosed // in case any Reads come along
 	return nil
 }
 
-// Reset clears the Reader's state and allows it to be reused again
-// as a new Reader.
+// Reset clears the [Reader]'s state and allows it to be reused again
+// as a new [Reader].
 func (r *Reader) Reset(src io.Reader, order Order, litWidth int) {
 	*r = Reader{}
 	r.init(src, order, litWidth)
 }
 
-// NewReader creates a new io.ReadCloser.
-// Reads from the returned io.ReadCloser read and decompress data from r.
+// NewReader creates a new [io.ReadCloser].
+// Reads from the returned [io.ReadCloser] read and decompress data from r.
 // If r does not also implement [io.ByteReader],
 // the decompressor may read more data than necessary from r.
 // It is the caller's responsibility to call Close on the ReadCloser when
@@ -249,8 +249,8 @@ func (r *Reader) Reset(src io.Reader, order Order, litWidth int) {
 // range [2,8] and is typically 8. It must equal the litWidth
 // used during compression.
 //
-// It is guaranteed that the underlying type of the returned io.ReadCloser
-// is a *Reader.
+// It is guaranteed that the underlying type of the returned [io.ReadCloser]
+// is a *[Reader].
 func NewReader(r io.Reader, order Order, litWidth int) io.ReadCloser {
 	return newReader(r, order, litWidth)
 }

src/compress/lzw/writer.go

@@ -32,7 +32,7 @@ const (
 )
 
 // Writer is an LZW compressor. It writes the compressed form of the data
-// to an underlying writer (see NewWriter).
+// to an underlying writer (see [NewWriter]).
 type Writer struct {
 	// w is the writer that compressed bytes are written to.
 	w writer
@@ -195,7 +195,7 @@ loop:
 	return n, nil
 }
 
-// Close closes the Writer, flushing any pending output. It does not close
+// Close closes the [Writer], flushing any pending output. It does not close
 // w's underlying writer.
 func (w *Writer) Close() error {
 	if w.err != nil {
@@ -238,22 +238,22 @@ func (w *Writer) Close() error {
 	return w.w.Flush()
 }
 
-// Reset clears the Writer's state and allows it to be reused again
-// as a new Writer.
+// Reset clears the[ Writer]'s state and allows it to be reused again
+// as a new [Writer].
 func (w *Writer) Reset(dst io.Writer, order Order, litWidth int) {
 	*w = Writer{}
 	w.init(dst, order, litWidth)
 }
 
-// NewWriter creates a new io.WriteCloser.
-// Writes to the returned io.WriteCloser are compressed and written to w.
+// NewWriter creates a new [io.WriteCloser].
+// Writes to the returned [io.WriteCloser] are compressed and written to w.
 // It is the caller's responsibility to call Close on the WriteCloser when
 // finished writing.
 // The number of bits to use for literal codes, litWidth, must be in the
 // range [2,8] and is typically 8. Input bytes must be less than 1<<litWidth.
 //
-// It is guaranteed that the underlying type of the returned io.WriteCloser
-// is a *Writer.
+// It is guaranteed that the underlying type of the returned [io.WriteCloser]
+// is a *[Writer].
 func NewWriter(w io.Writer, order Order, litWidth int) io.WriteCloser {
 	return newWriter(w, order, litWidth)
 }

src/compress/zlib/reader.go

@@ -55,7 +55,7 @@ type reader struct {
 	scratch      [4]byte
 }
 
-// Resetter resets a ReadCloser returned by NewReader or NewReaderDict
+// Resetter resets a ReadCloser returned by [NewReader] or [NewReaderDict]
 // to switch to a new underlying Reader. This permits reusing a ReadCloser
 // instead of allocating a new one.
 type Resetter interface {
@@ -70,16 +70,16 @@ type Resetter interface {
 // data than necessary from r.
 // It is the caller's responsibility to call Close on the ReadCloser when done.
 //
-// The ReadCloser returned by NewReader also implements Resetter.
+// The ReadCloser returned by NewReader also implements [Resetter].
 func NewReader(r io.Reader) (io.ReadCloser, error) {
 	return NewReaderDict(r, nil)
 }
 
-// NewReaderDict is like NewReader but uses a preset dictionary.
+// NewReaderDict is like [NewReader] but uses a preset dictionary.
 // NewReaderDict ignores the dictionary if the compressed data does not refer to it.
-// If the compressed data refers to a different dictionary, NewReaderDict returns ErrDictionary.
+// If the compressed data refers to a different dictionary, NewReaderDict returns [ErrDictionary].
 //
-// The ReadCloser returned by NewReaderDict also implements Resetter.
+// The ReadCloser returned by NewReaderDict also implements [Resetter].
 func NewReaderDict(r io.Reader, dict []byte) (io.ReadCloser, error) {
 	z := new(reader)
 	err := z.Reset(r, dict)
@@ -119,7 +119,7 @@ func (z *reader) Read(p []byte) (int, error) {
 	return n, io.EOF
 }
 
-// Calling Close does not close the wrapped io.Reader originally passed to NewReader.
+// Calling Close does not close the wrapped io.Reader originally passed to [NewReader].
 // In order for the ZLIB checksum to be verified, the reader must be
 // fully consumed until the io.EOF.
 func (z *reader) Close() error {