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image/jpeg: "fill bytes" not supported #4337

gopherbot opened this issue Nov 3, 2012 · 4 comments

image/jpeg: "fill bytes" not supported #4337

gopherbot opened this issue Nov 3, 2012 · 4 comments


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by jsummers3456:

In a JPEG file, extra 0xff bytes immediately preceding a marker are called "fill
bytes", and are supposed to be ignored. Go fails to decode any file that contains
fill bytes.

Test case: Use jpeg.Decode() to read the attached file.

Expected result: The image is decoded successfully.

Actual result: Error: "unsupported JPEG feature: unknown marker"

Compiler: 6g
OS: Linux
Version: devel +8a65cc8e918e Sat Nov 03 02:22:37 2012 +0800


  1. fbtest.jpg (1243 bytes)
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robpike commented Nov 4, 2012

Comment 1:

Labels changed: added priority-later, removed priority-triage.

Owner changed to @nigeltao.

Status changed to Accepted.

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nigeltao commented Nov 5, 2012

Comment 2:

Can you describe how that test image was generated?

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Comment 3 by jsummers3456:

I don't know of any applications that write fill bytes, if that's what you're asking. I
created it artificially.

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nigeltao commented Nov 7, 2012

Comment 4:

This issue was closed by revision 64b3e59.

Status changed to Fixed.

@rsc rsc added this to the Go1.1 milestone Apr 14, 2015
@rsc rsc removed the go1.1 label Apr 14, 2015
@golang golang locked and limited conversation to collaborators Jun 24, 2016
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4 participants