From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: AS31976 209.132.180.0/23 X-Spam-Status: No, score=-4.0 required=3.0 tests=AWL,BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI shortcircuit=no autolearn=ham autolearn_force=no version=3.4.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by dcvr.yhbt.net (Postfix) with ESMTP id 364F11F453 for ; Sun, 4 Nov 2018 23:45:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729898AbeKEJBz (ORCPT ); Mon, 5 Nov 2018 04:01:55 -0500 Received: from injection.crustytoothpaste.net ([192.241.140.119]:53212 "EHLO injection.crustytoothpaste.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729686AbeKEJBy (ORCPT ); Mon, 5 Nov 2018 04:01:54 -0500 Received: from genre.crustytoothpaste.net (unknown [IPv6:2001:470:b978:101:941b:b2ff:ecfe:7f28]) (using TLSv1.2 with cipher ECDHE-RSA-CHACHA20-POLY1305 (256/256 bits)) (No client certificate requested) by injection.crustytoothpaste.net (Postfix) with ESMTPSA id 75B506077B; Sun, 4 Nov 2018 23:45:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=crustytoothpaste.net; s=default; t=1541375109; bh=oJvQgvoTxof4lF82L/GM3/DdTPxmny0e8JzRlxvKggc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From:Reply-To: Subject:Date:To:CC:Resent-Date:Resent-From:Resent-To:Resent-Cc: In-Reply-To:References:Content-Type:Content-Disposition; b=vP69NudicByoz3VGc/t9xWT1yCY+/EkFM+pBhLoljEt7/FH88Sx/NvYQ4dyHOQLg3 q11DMHLTlKhYor3FvnQ979O13KrIlXICK1yaW/YXKT0TzFqZJD1UyNau0Crtz8jmfd G6yAJhUcVO736WEnQG652jVFAyLgg52uVQGSgoBgtSMIS7QAMnpMVywX7xs7qCXRbV ljh4aJ7tIRIgwySCo70c3b9hPWEEWCz6sPBDGU3CmNOwJvgzIk2aohiLml4IGMMYt4 3OFwarn5UTIIA8C6SOfKR+d0tqmRL9T641cPSQAOwPFYdXWdMfX7gccqED0i4TRuLh zwiBMutTekvVcyrfrBtaRmkxOc48yLNjkKECpKiWCApCU+bcJVylflFC/9w4oRdCGJ vS0KdgHvCqyDW5lb0acAUCIpcp5nYs8TegqGnr9LkRsKXAHobQCE6qPd5Dm0kWtQMI CLGtpicdNrkluUmskhfK41WY4d+Zq+nIsVyndxNHlyOcSLJGeCE From: "brian m. carlson" To: git@vger.kernel.org Cc: Derrick Stolee , =?UTF-8?q?=C3=86var=20Arnfj=C3=B6r=C3=B0=20Bjarmason?= , Duy Nguyen , =?UTF-8?q?SZEDER=20G=C3=A1bor?= , Jakub Narebski , Christian Couder Subject: [PATCH v5 02/12] sha1-file: provide functions to look up hash algorithms Date: Sun, 4 Nov 2018 23:44:48 +0000 Message-Id: <20181104234458.139223-3-sandals@crustytoothpaste.net> X-Mailer: git-send-email 2.19.1.930.g4563a0d9d0 In-Reply-To: <20181104234458.139223-1-sandals@crustytoothpaste.net> References: <20181025024005.154208-1-sandals@crustytoothpaste.net> <20181104234458.139223-1-sandals@crustytoothpaste.net> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 127.0.1.1 Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org There are several ways we might refer to a hash algorithm: by name, such as in the config file; by format ID, such as in a pack; or internally, by a pointer to the hash_algos array. Provide functions to look up hash algorithms based on these various forms and return the internal constant used for them. If conversion to another form is necessary, this internal constant can be used to look up the proper data in the hash_algos array. Signed-off-by: brian m. carlson --- hash.h | 13 +++++++++++++ sha1-file.c | 21 +++++++++++++++++++++ 2 files changed, 34 insertions(+) diff --git a/hash.h b/hash.h index 7c8238bc2e..80881eea47 100644 --- a/hash.h +++ b/hash.h @@ -98,4 +98,17 @@ struct git_hash_algo { }; extern const struct git_hash_algo hash_algos[GIT_HASH_NALGOS]; +/* + * Return a GIT_HASH_* constant based on the name. Returns GIT_HASH_UNKNOWN if + * the name doesn't match a known algorithm. + */ +int hash_algo_by_name(const char *name); +/* Identical, except based on the format ID. */ +int hash_algo_by_id(uint32_t format_id); +/* Identical, except for a pointer to struct git_hash_algo. */ +static inline int hash_algo_by_ptr(const struct git_hash_algo *p) +{ + return p - hash_algos; +} + #endif diff --git a/sha1-file.c b/sha1-file.c index 91311ebb3d..7e9dedc744 100644 --- a/sha1-file.c +++ b/sha1-file.c @@ -122,6 +122,27 @@ const char *empty_blob_oid_hex(void) return oid_to_hex_r(buf, the_hash_algo->empty_blob); } +int hash_algo_by_name(const char *name) +{ + int i; + if (!name) + return GIT_HASH_UNKNOWN; + for (i = 1; i < GIT_HASH_NALGOS; i++) + if (!strcmp(name, hash_algos[i].name)) + return i; + return GIT_HASH_UNKNOWN; +} + +int hash_algo_by_id(uint32_t format_id) +{ + int i; + for (i = 1; i < GIT_HASH_NALGOS; i++) + if (format_id == hash_algos[i].format_id) + return i; + return GIT_HASH_UNKNOWN; +} + + /* * This is meant to hold a *small* number of objects that you would * want read_sha1_file() to be able to return, but yet you do not want