From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:52230) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Sm3YN-0005OI-FK for qemu-devel@nongnu.org; Tue, 03 Jul 2012 09:54:13 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Sm3YG-000500-Pr for qemu-devel@nongnu.org; Tue, 03 Jul 2012 09:54:07 -0400 Received: from mx1.redhat.com ([209.132.183.28]:18119) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Sm3YG-0004vx-IT for qemu-devel@nongnu.org; Tue, 03 Jul 2012 09:54:00 -0400 From: Orit Wasserman Date: Tue, 3 Jul 2012 16:52:46 +0300 Message-Id: <1341323574-23206-6-git-send-email-owasserm@redhat.com> In-Reply-To: <1341323574-23206-1-git-send-email-owasserm@redhat.com> References: <1341323574-23206-1-git-send-email-owasserm@redhat.com> Subject: [Qemu-devel] [PATCH v14 05/13] Add uleb encoding/decoding functions List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org 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 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 1ce7023..42e4498 100644 --- a/qemu-common.h +++ b/qemu-common.h @@ -437,4 +437,12 @@ static inline int64_t round2pow2(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 -- 1.7.7.6