From patchwork Wed Jun 27 10:34:13 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Orit Wasserman X-Patchwork-Id: 167621 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 4B0CFB7004 for ; Wed, 27 Jun 2012 21:09:42 +1000 (EST) Received: from localhost ([::1]:55447 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SjpbP-0005xf-5M for incoming@patchwork.ozlabs.org; Wed, 27 Jun 2012 06:36:03 -0400 Received: from eggs.gnu.org ([208.118.235.92]:47118) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SjpaI-0003uf-PM for qemu-devel@nongnu.org; Wed, 27 Jun 2012 06:35:02 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1SjpaD-0006pO-VP for qemu-devel@nongnu.org; Wed, 27 Jun 2012 06:34:54 -0400 Received: from mx1.redhat.com ([209.132.183.28]:40141) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SjpaD-0006p1-N6 for qemu-devel@nongnu.org; Wed, 27 Jun 2012 06:34:49 -0400 Received: from int-mx12.intmail.prod.int.phx2.redhat.com (int-mx12.intmail.prod.int.phx2.redhat.com [10.5.11.25]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id q5RAYisP024335 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Wed, 27 Jun 2012 06:34:44 -0400 Received: from dhcp-1-120.tlv.redhat.com (vpn-200-91.tlv.redhat.com [10.35.200.91]) by int-mx12.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id q5RAYHqJ013602; Wed, 27 Jun 2012 06:34:40 -0400 From: Orit Wasserman To: qemu-devel@nongnu.org Date: Wed, 27 Jun 2012 13:34:13 +0300 Message-Id: <1340793261-11400-6-git-send-email-owasserm@redhat.com> In-Reply-To: <1340793261-11400-1-git-send-email-owasserm@redhat.com> References: <1340793261-11400-1-git-send-email-owasserm@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.25 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 209.132.183.28 Cc: peter.maydell@linaro.org, aliguori@us.ibm.com, quintela@redhat.com, stefanha@gmail.com, mdroth@linux.vnet.ibm.com, blauwirbel@gmail.com, Orit Wasserman , chegu_vinod@hp.com, avi@redhat.com, pbonzini@redhat.com, eblake@redhat.com Subject: [Qemu-devel] [PATCH v13 05/13] Add uleb encoding/decoding functions X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Implement Unsigned Little Endian Base 128. Signed-off-by: Orit Wasserman --- cutils.c | 32 ++++++++++++++++++++++++++++++++ qemu-common.h | 8 ++++++++ 2 files changed, 40 insertions(+), 0 deletions(-) diff --git a/cutils.c b/cutils.c index af308cd..3f81d53 100644 --- a/cutils.c +++ b/cutils.c @@ -549,3 +549,35 @@ int qemu_sendv(int sockfd, struct iovec *iov, int len, int iov_offset) return do_sendv_recvv(sockfd, iov, len, iov_offset, 1); } +/* + * Implementation of ULEB128 (http://en.wikipedia.org/wiki/LEB128) + * Input is limited to 14-bit numbers + */ +int uleb128_encode_small(uint8_t *out, uint32_t n) +{ + g_assert(n <= 0x3fff); + if (n < 0x80) { + *out++ = n; + return 1; + } else { + *out++ = (n & 0x7f) | 0x80; + *out++ = n >> 7; + return 2; + } +} + +int uleb128_decode_small(const uint8_t *in, uint32_t *n) +{ + if (!(*in & 0x80)) { + *n = *in++; + return 1; + } else { + *n = *in++ & 0x7f; + /* we exceed 14 bit number */ + if (*in & 0x80) { + return -1; + } + *n |= *in++ << 7; + return 2; + } +} diff --git a/qemu-common.h b/qemu-common.h index 45b1d97..f7875ae 100644 --- a/qemu-common.h +++ b/qemu-common.h @@ -429,4 +429,12 @@ static inline bool is_power_of_2(int64_t value) #include "module.h" +/* + * Implementation of ULEB128 (http://en.wikipedia.org/wiki/LEB128) + * Input is limited to 14-bit numbers + */ + +int uleb128_encode_small(uint8_t *out, uint32_t n); +int uleb128_decode_small(const uint8_t *in, uint32_t *n); + #endif