785093 - Blob constructors are incorrect

Status: RESOLVED INVALID

(Core :: DOM: Core & HTML, defect)

Description

[Dennis Boldt]

My system:

- Ubuntu 10.04 - 64 bit
- Firefox 14.0.1 ( http://download.mozilla.org/?product=firefox-14.0.1&os=linux&lang=en-US )

The spec for the FileAPI says for the Blob-constructor:

 * ArrayBufferView [TypedArrays] array elements
 * Blob array elements
 * DOMString [WebIDL] array elements

  http://www.w3.org/TR/FileAPI/#dfn-blobParts

Due to this, i wrote a simple test (see the console):

  http://localhost/test/blob.html

The Result:

Creating a Blob

 * from String - works correct
 * from Blob - failes with "Illegal value"  nsresult: "0x80070057 (NS_ERROR_ILLEGAL_VALUE)" 
 * from ArrayBufferView (Uint8Array) failes with "An attempt was made to use an object that is not, or is no longer, usable"
 * from ArrayBuffer works, but it shouldn't

Comment 1

[Dennis Boldt]

Whops, localhost will not work:

Here the sample code: 

  http://www.dennis-boldt.de/test/blob

Comment 2

[Dennis Boldt]

C&P from the example from the spec ( http://www.w3.org/TR/FileAPI/#dfn-blobParts ):

  http://www.dennis-boldt.de/test/blob/index2.html

Also not working.

Comment 3

[Boris Zbarsky [:bzbarsky]]

ArrayBufferView will work in Firefox 15; see bug 752402.  This was a recent (after development of Firefox 14 was done) spec change.

I believe the "ArrayBuffer should not work" bit is a spec bug (again, see discussion in bug 752402).  Not sure whether that's filed, though.

Code inspection suggests that passing a Blob should work.  Could you attach a testcase in which it doesn't?  The above localhost link isn't all that usable.  ;)

Comment 4

[:Ms2ger (he/him; ⌚ UTC+1/+2)]

(In reply to Boris Zbarsky (:bz) from comment #3)
> I believe the "ArrayBuffer should not work" bit is a spec bug (again, see
> discussion in bug 752402).  Not sure whether that's filed, though.

It isn't.

Comment 5

[Dennis Boldt]

I forgot the squared brackets in the "from Blob" test case. 

It works now. Thanks.

Comment 6

[Boris Zbarsky [:bzbarsky]]

Thanks for double-checking that!