package lzw

Import Path
	compress/lzw (on go.dev)

Dependency Relation
	imports 4 packages, and imported by one package


Involved Source Files

	
		Package lzw implements the Lempel-Ziv-Welch compressed data format,
		described in T. A. Welch, “A Technique for High-Performance Data
		Compression”, Computer, 17(6) (June 1984), pp 8-19.
		
		In particular, it implements LZW as used by the GIF and PDF file
		formats, which means variable-width codes up to 12 bits and the first
		two non-literal codes are a clear code and an EOF code.
		
		The TIFF file format uses a similar but incompatible version of the LZW
		algorithm. See the [golang.org/x/image/tiff/lzw] package for an
		implementation.

	    writer.go


Package-Level Type Names (total 3)


	/* sort by:  |  */
	
		Order specifies the bit ordering in an LZW data stream.

		
			func NewReader(r io.Reader, order Order, litWidth int) io.ReadCloser
			func NewWriter(w io.Writer, order Order, litWidth int) io.WriteCloser
			func (*Reader).Reset(src io.Reader, order Order, litWidth int)
			func (*Writer).Reset(dst io.Writer, order Order, litWidth int)
		
			const LSB
			const MSB


	
		Reader is an [io.Reader] which can be used to read compressed data in the
		LZW format.

		
			
				Close closes the [Reader] and returns an error for any future read operation.
				It does not close the underlying [io.Reader].

			
				Read implements io.Reader, reading uncompressed bytes from its underlying reader.

			
				Reset clears the [Reader]'s state and allows it to be reused again
				as a new [Reader].

		
			*Reader : io.Closer
			*Reader : io.ReadCloser
			*Reader : io.Reader


	
		Writer is an LZW compressor. It writes the compressed form of the data
		to an underlying writer (see [NewWriter]).

		
			
				Close closes the [Writer], flushing any pending output. It does not close
				w's underlying writer.

			
				Reset clears the [Writer]'s state and allows it to be reused again
				as a new [Writer].

			
				Write writes a compressed representation of p to w's underlying writer.

		
			*Writer : internal/bisect.Writer
			*Writer : io.Closer
			*Writer : io.WriteCloser
			*Writer : io.Writer




Package-Level Functions (total 2)


	
		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
		finished reading.
		The number of bits to use for literal codes, litWidth, must be in the
		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].


	
		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].




Package-Level Constants (total 2)


	
		LSB means Least Significant Bits first, as used in the GIF file format.


	
		MSB means Most Significant Bits first, as used in the TIFF and PDF
		file formats.