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compress/lzw: silently drop implied codes that are too large,

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instead of returning an error.

For example, http://www.w3.org/Graphics/GIF/spec-gif89a.txt
explicitly says that GIF encoders can use a full table as is,
without needing to send a clear code.

R=r, dsymonds, nigeltao_gnome, r2
CC=golang-dev
https://golang.org/cl/4518041
This commit is contained in:
Nigel Tao 2011-05-07 18:57:32 -07:00
parent a4dee3a746
commit f467803dcd
1 changed files with 8 additions and 5 deletions
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13
src/pkg/compress/lzw/reader.go
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@ -165,16 +165,19 @@ func decode1(pw *io.PipeWriter, r io.ByteReader, read func(*decoder) (uint16, os
if _, err := w.Write(buf[i:]); err != nil { if _, err := w.Write(buf[i:]); err != nil {
return err return err
} }
// Save what the hi code expands to. if last != invalidCode {
suffix[hi] = uint8(c) // Save what the hi code expands to.
prefix[hi] = last suffix[hi] = uint8(c)
prefix[hi] = last
}
default: default:
return os.NewError("lzw: invalid code") return os.NewError("lzw: invalid code")
} }
last, hi = code, hi+1 last, hi = code, hi+1
if hi == overflow { if hi >= overflow {
if d.width == maxWidth { if d.width == maxWidth {
return os.NewError("lzw: missing clear code") last = invalidCode
continue
} }
d.width++ d.width++
overflow <<= 1 overflow <<= 1