IETF Logo Mail Archive

Re: [quicwg/base-drafts] QPACK encoding requires two passes (#1138)

Mike Bishop <notifications@github.com> Thu, 21 June 2018 20:51 UTC

Return-Path: <noreply@github.com>
X-Original-To: quic-issues@ietfa.amsl.com
Delivered-To: quic-issues@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9F9C2130DC2 for <quic-issues@ietfa.amsl.com>; Thu, 21 Jun 2018 13:51:52 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -8.009
X-Spam-Level:
X-Spam-Status: No, score=-8.009 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, MAILING_LIST_MULTI=-1, RCVD_IN_DNSWL_HI=-5, SPF_PASS=-0.001, T_DKIMWL_WL_HIGH=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=github.com
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id p4NXFboWEI9j for <quic-issues@ietfa.amsl.com>; Thu, 21 Jun 2018 13:51:51 -0700 (PDT)
Received: from out-5.smtp.github.com (out-5.smtp.github.com [192.30.252.196]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CD9271294D0 for <quic-issues@ietf.org>; Thu, 21 Jun 2018 13:51:50 -0700 (PDT)
Date: Thu, 21 Jun 2018 13:51:49 -0700
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=github.com; s=pf2014; t=1529614309; bh=VOc3j9lZBf4Xfw4pNj7psp/jS8la1Wyn5/jQwBe1D7U=; h=Date:From:Reply-To:To:Cc:In-Reply-To:References:Subject:List-ID: List-Archive:List-Post:List-Unsubscribe:From; b=XJOWEBKn/tbjEwpI6fZh9Ts/HrFolxeyNgq2cwuwkql87QnJEkaMwffyblSp2Os2U hYMWiM2oKudtO8i5nxGSSc1fX19THUqmrhkUhfLE9+jcs1zuPF9iJgemfFXb7N0Mgo F52f2U+uLylPLT3KCpSSOgl7pBLHCYyB+VDXaAek=
From: Mike Bishop <notifications@github.com>
Reply-To: quicwg/base-drafts <reply+0166e4ab2e7bb0f3a3c7136331c7ec888c8525d62cd6479b92cf000000011743d1e592a169ce11dea75a@reply.github.com>
To: quicwg/base-drafts <base-drafts@noreply.github.com>
Cc: Subscribed <subscribed@noreply.github.com>
Message-ID: <quicwg/base-drafts/issues/1138/399239646@github.com>
In-Reply-To: <quicwg/base-drafts/issues/1138@github.com>
References: <quicwg/base-drafts/issues/1138@github.com>
Subject: Re: [quicwg/base-drafts] QPACK encoding requires two passes (#1138)
Mime-Version: 1.0
Content-Type: multipart/alternative; boundary="--==_mimepart_5b2c0fe5d21c8_ffa2b17033b0f5c6165a"; charset="UTF-8"
Content-Transfer-Encoding: 7bit
Precedence: list
X-GitHub-Sender: MikeBishop
X-GitHub-Recipient: quic-issues
X-GitHub-Reason: subscribed
X-Auto-Response-Suppress: All
X-GitHub-Recipient-Address: quic-issues@ietf.org
Archived-At: <https://mailarchive.ietf.org/arch/msg/quic-issues/0tSzfZK15ltRA7Get9voerrLb7k>
X-BeenThere: quic-issues@ietf.org
X-Mailman-Version: 2.1.26
List-Id: Notification list for GitHub issues related to the QUIC WG <quic-issues.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/quic-issues>, <mailto:quic-issues-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/quic-issues/>
List-Post: <mailto:quic-issues@ietf.org>
List-Help: <mailto:quic-issues-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/quic-issues>, <mailto:quic-issues-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 21 Jun 2018 20:51:53 -0000

Yes, they would be illegal because they would by definition be referring to values greater than the Largest Reference.  That doesn't mean it's nonsensical -- a single-pass encoder will pick a Base Index before it knows what references it will make; if it doesn't insert any entries, then it won't need to make post-base references.

A two-pass encoder will probably make them always equal and never make post-base references.

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/quicwg/base-drafts/issues/1138#issuecomment-399239646

v2.39.1 | Report a Bug | By Email | System Status