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compress/lzw: add commentary that TIFF's LZW differs from the standard 

algorithm.

See https://golang.org/cl/105750045/ for an implementation of
TIFF's LZW.

LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/102940043
This commit is contained in:
Nigel Tao 2014-06-13 17:44:29 +10:00
parent eb788045d8
commit 9f08c5c383
1 changed files with 6 additions and 2 deletions
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8
src/pkg/compress/lzw/reader.go
View File

@ -6,12 +6,16 @@
// 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, TIFF and PDF file
// 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 code.google.com/p/go.image/tiff/lzw package for an
// implementation.
package lzw
// TODO(nigeltao): check that TIFF and PDF use LZW in the same way as GIF,
// TODO(nigeltao): check that PDF uses LZW in the same way as GIF,
// modulo LSB/MSB packing order.
import (