The docs do mention the index values are inclusive:

http://code.google.com/appengine/docs/python/blobstore/functions.html

"Byte indexes are inclusive, with the first byte having an index of 0.
For example, a start_index of 9 and an end_index of 19 will return up
to 11 bytes, starting from the 10th byte (index 9) in the value."

Robin

On Mar 30, 5:21 pm, Ikai Lan <i...@google.com> wrote:
> I've reproduced the off-by-one error. Thanks for bringing this up.
>
> On Mar 27, 8:32 am, "jacek.ambroziak" <jacek.ambroz...@gmail.com>
> wrote:
>
>
>
> > fetchData is very useful. At the moment its implementation seems to
> > suffer from an off-by-one bug.
> > For instance, fetchData(key, 0, 1024) returns an array of length 1025
> > and
> > blobstoreService.fetchData(blobKey, 0,
> > BlobstoreService.MAX_BLOB_FETCH_SIZE)
> > will, I guess, attempt to read one byte too many and it fails with
>
> >   com.google.appengine.api.blobstore.BlobstoreFailureException: An
> > unexpected error occurred.
>
> > On Mar 25, 8:48 pm, "Ikai L (Google)" <ika...@google.com> wrote:
>
> > > Check it out!
>
> > >http://googleappengine.blogspot.com/2010/03/app-engine-sdk-132-releas...
>
> > > Blog post:
>
> > > App Engine SDK 1.3.2
> > > Released<http://googleappengine.blogspot.com/2010/03/app-engine-sdk-132-releas...>
>
> > > Today we are excited to announce the release of version 1.3.2 of the App
> > > Engine SDK for both the Java and Python runtimes. 1.3.2 includes a number 
> > > of
> > > changes and bug fixes.
>
> > > For this release, we have concentrated on removing a number of limitations
> > > that have been affecting developers:
>
> > >    - Blobstore API - A new method
> > > (fetch_data<http://code.google.com/appengine/docs/python/blobstore/functions.html>
> > > for
> > >    Python, 
> > > fetchData<http://code.google.com/appengine/docs/java/javadoc/com/google/appengi...>
> > > for
> > >    Java) allows your application to request the contents of a Blob from 
> > > within
> > >    your application’s code.
> > >    - URLFetch API - We’ve expanded the number of ports you can access with
> > >    the URLFetch API. You can now access ports 80-90, 440-450, and 
> > > 1024-65535.
> > >    - Mail API - We’ve expanded the allowed mail attachments to include
> > >    common document extensions including .doc, .ppt, and .xls.
> > >    - Task Queue API - We’ve increased the maximum total Task Queue refill
> > >    rate to 50 per second.
>
> > > We’re also happy to announce, based on your feedback, a new Denial of
> > > Service (DoS) blocking system in App Engine. This system allows you to
> > > blacklist specific IP addresses from accessing your application, and to
> > > prevent them from costing your application money or eating up your quota.
> > > You can also view the top IPs that have accessed your application in the
> > > Admin Console, to help you figure out what IPs you may want to block. More
> > > information on this feature is available for
> > > Python<http://code.google.com/appengine/docs/python/config/dos.html>
> > > and Java <http://code.google.com/appengine/docs/java/config/dos.html>.
>
> > > There’s a lot of other changes and fixes in this release, including a new
> > > Java version of the Appstats profiling tool, so read the release notes (
> > > Python <http://code.google.com/p/googleappengine/wiki/SdkReleaseNotes>,
> > > Java<http://code.google.com/p/googleappengine/wiki/SdkForJavaReleaseNotes>)
> > > for a complete list of changes and download the new versions of the
> > > SDK<http://code.google.com/appengine/downloads.html>
> > > .
>
> > > Release Notes:
>
> > > Version 1.3.2 - March 25, 2010
>
> > >    - New API to read the contents of uploaded Blobs (fetch_data)
> > >    -http://code.google.com/p/googleappengine/issues/detail?id=2536
>
> > >    - URLFetch now supports accessing ports 80-90, 440-450, and 1024-65535
> > >    - Mail API now allows common document formats as attachments
> > >       -http://code.google.com/p/googleappengine/issues/detail?id=494
> > >    - The Task Queue API now supports adding multiple tasks in a single 
> > > call
> > >    to Queue.add()
> > >    - Fixed charset handling for inbound emails
> > >       -http://code.google.com/p/googleappengine/issues/detail?id=2326
> > >    - Fixed issue with compositing background colors in dev_appserver
> > >    - New feature in the datastore to specify whether to use strong or
> > >    eventually consistent reads (the default is strong)
> > >    - New datastore feature allows setting deadlines for operations
> > >    - Increased the maximum Task Queue refill rate from 20/s to 50/s
> > >    - Support for IP blacklisting to prevent denial of service (DoS) 
> > > attacks
> > >    - Fix an issue with Mac Launcher in Mac OSX 10.5.5
> > >       -http://code.google.com/p/googleappengine/issues/detail?id=778
> > >    - Fix issue with slow updates when there are many skipped files
> > >       -http://code.google.com/p/googleappengine/issues/detail?id=2492
> > >    - Fix issue with cursor not updating when using a
> > > GqlQuery?<http://code.google.com/p/googleappengine/w/edit/GqlQuery>
> > >       -http://code.google.com/p/googleappengine/issues/detail?id=2757
>
> > > You might also want to note that we've updated the public roadmap:
>
> > >http://code.google.com/appengine/docs/roadmap.html
>
> > > Features on Deck
>
> > >    - SSL for third-party domains
> > >    - Background servers capable of running for longer than 30s
> > >    - Ability to reserve instances to reduce application loading overhead
> > >    - Ability to select different availability vs. latency options for
> > >    Datastore
> > >    - Support for mapping operations across datasets
> > >    - Datastore dump and restore facility
> > >    - Raise request/response size limits for some APIs
> > >    - Improved monitoring and alerting of application serving
> > >    - Support for Browser Push (Comet) communication
> > >    - Built-in support for OAuth & OpenID
>
> > > --
> > > Ikai Lan
> > > Developer Programs Engineer, Google App 
> > > Enginehttp://googleappengine.blogspot.com|http://twitter.com/app_engine

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