From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on dcvr.yhbt.net X-Spam-Level: X-Spam-Status: No, score=-3.7 required=3.0 tests=AWL,BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,RCVD_IN_DNSWL_BLOCKED, SPF_HELO_PASS,SPF_PASS shortcircuit=no autolearn=ham autolearn_force=no version=3.4.2 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by dcvr.yhbt.net (Postfix) with ESMTP id A25E21F8C4 for ; Fri, 5 Feb 2021 22:03:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233002AbhBEWBL (ORCPT ); Fri, 5 Feb 2021 17:01:11 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49206 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232970AbhBEO5n (ORCPT ); Fri, 5 Feb 2021 09:57:43 -0500 Received: from mail-wm1-x32a.google.com (mail-wm1-x32a.google.com [IPv6:2a00:1450:4864:20::32a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 72909C06121E for ; Fri, 5 Feb 2021 08:28:40 -0800 (PST) Received: by mail-wm1-x32a.google.com with SMTP id u14so6353519wmq.4 for ; Fri, 05 Feb 2021 08:28:40 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=message-id:in-reply-to:references:from:date:subject:fcc :content-transfer-encoding:mime-version:to:cc; bh=FESohs3eVG/Vtak1cJSjlpSe3VyQTAQuJDbcHz3Ibp8=; b=pLwXNUiq8fNt7rjt7OrDo1fI3amhyhC49xPMMIH2XoKREnVg2AZ1cABK7ztRWAVq3k 5JGNNu/ZF3lrH1T9G0sb7s/1gPC0BksgDZS7gCgLLMO1XihYGWcGyjImaMsUeSYJglKw o/95mVT5DTHRFv0VHDS6big6qc0I5UG32gHf0RaMFdm/ryPFRjc2o2wZw0QF7pWik1s5 lu42JN2EixLKTxnxw3FkMD00GDw4+JPY5zzk3+K/2H8F0jeyVXAt853kNs7zVDl/btZA kdk5tRhKVi7TDU/w94TT/gBbzk7XKKL6LNOacR7wV9tcMzCblYxXaQ7GPw0oeikbI0lg Pvwg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:message-id:in-reply-to:references:from:date :subject:fcc:content-transfer-encoding:mime-version:to:cc; bh=FESohs3eVG/Vtak1cJSjlpSe3VyQTAQuJDbcHz3Ibp8=; b=awJe0lMoboDgf90TEaMRnMYxz7Yy04uS7ua6lmb0nOaSBeE18LdCgdMygJk6LZ8M90 6ApcEfedMXvGO03ueu7ePHVCIpmAfzu/WY4B+g0x2sez5aX+2cZslAbC/Umm4w3wqXkX 6JfDI4fZe/bAFfRv/He9BG0fcxRd8ul1ycV8nR9bDHGQrDE7d3+ab/p8Muymy/drj17G 8iy3LFdfmenEUhCjRuCAvl2Oei5SkY7KaWQ040IQoee2o/EYIUul85iixTjW7g+xG/rN 8iN45vld5GK3RLitkQ+clrEQHBtRJwuxsTPYcGljIU8B7/Ju36Y0t//m/d2tg3ANBm3v dSSw== X-Gm-Message-State: AOAM530EF11OgW6Sg0k422CqUz6aOSqF4E9wxi4EFhqPBFq16QoxYsJf ZrxPzF+VISZTGOXJWIo/vsHOvWAp8oA= X-Google-Smtp-Source: ABdhPJxkh4nyD5a9ia2nvNDegEdgfBJcqXm3IHeYtl4FG1GB+I3of7kiezL/Jc0brtsqtyLoLd+Wyg== X-Received: by 2002:a05:600c:20f:: with SMTP id 15mr3883348wmi.148.1612535456551; Fri, 05 Feb 2021 06:30:56 -0800 (PST) Received: from [127.0.0.1] ([13.74.141.28]) by smtp.gmail.com with ESMTPSA id i6sm11491851wrs.71.2021.02.05.06.30.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 05 Feb 2021 06:30:55 -0800 (PST) Message-Id: <16c37d2370cf4fd5fc309ac6dc8aa6443ffcf3d7.1612535453.git.gitgitgadget@gmail.com> In-Reply-To: References: From: "Derrick Stolee via GitGitGadget" Date: Fri, 05 Feb 2021 14:30:37 +0000 Subject: [PATCH v3 02/17] chunk-format: create chunk format write API Fcc: Sent Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit MIME-Version: 1.0 To: git@vger.kernel.org Cc: me@ttaylorr.com, gitster@pobox.com, l.s.r@web.de, szeder.dev@gmail.com, Chris Torek , Derrick Stolee , Derrick Stolee , Derrick Stolee Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org From: Derrick Stolee In anticipation of combining the logic from the commit-graph and multi-pack-index file formats, create a new chunk-format API. Use a 'struct chunkfile' pointer to keep track of data that has been registered for writes. This struct is anonymous outside of chunk-format.c to ensure no user attempts to interfere with the data. The next change will use this API in commit-graph.c, but the general approach is: 1. initialize the chunkfile with init_chunkfile(f). 2. add chunks in the intended writing order with add_chunk(). 3. write any header information to the hashfile f. 4. write the chunkfile data using write_chunkfile(). 5. free the chunkfile struct using free_chunkfile(). Helped-by: Taylor Blau Helped-by: Junio C Hamano Signed-off-by: Derrick Stolee --- Makefile | 1 + chunk-format.c | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++ chunk-format.h | 19 +++++++++++ 3 files changed, 111 insertions(+) create mode 100644 chunk-format.c create mode 100644 chunk-format.h diff --git a/Makefile b/Makefile index 7b64106930a6..50a7663841e9 100644 --- a/Makefile +++ b/Makefile @@ -854,6 +854,7 @@ LIB_OBJS += bundle.o LIB_OBJS += cache-tree.o LIB_OBJS += chdir-notify.o LIB_OBJS += checkout.o +LIB_OBJS += chunk-format.o LIB_OBJS += color.o LIB_OBJS += column.o LIB_OBJS += combine-diff.o diff --git a/chunk-format.c b/chunk-format.c new file mode 100644 index 000000000000..6e0f1900213e --- /dev/null +++ b/chunk-format.c @@ -0,0 +1,91 @@ +#include "cache.h" +#include "chunk-format.h" +#include "csum-file.h" +#define CHUNK_LOOKUP_WIDTH 12 + +/* + * When writing a chunk-based file format, collect the chunks in + * an array of chunk_info structs. The size stores the _expected_ + * amount of data that will be written by write_fn. + */ +struct chunk_info { + uint32_t id; + uint64_t size; + chunk_write_fn write_fn; +}; + +struct chunkfile { + struct hashfile *f; + + struct chunk_info *chunks; + size_t chunks_nr; + size_t chunks_alloc; +}; + +struct chunkfile *init_chunkfile(struct hashfile *f) +{ + struct chunkfile *cf = xcalloc(1, sizeof(*cf)); + cf->f = f; + return cf; +} + +void free_chunkfile(struct chunkfile *cf) +{ + if (!cf) + return; + free(cf->chunks); + free(cf); +} + +int get_num_chunks(struct chunkfile *cf) +{ + return cf->chunks_nr; +} + +void add_chunk(struct chunkfile *cf, + uint32_t id, + size_t size, + chunk_write_fn fn) +{ + ALLOC_GROW(cf->chunks, cf->chunks_nr + 1, cf->chunks_alloc); + + cf->chunks[cf->chunks_nr].id = id; + cf->chunks[cf->chunks_nr].write_fn = fn; + cf->chunks[cf->chunks_nr].size = size; + cf->chunks_nr++; +} + +int write_chunkfile(struct chunkfile *cf, void *data) +{ + int i; + uint64_t cur_offset = hashfile_total(cf->f); + + /* Add the table of contents to the current offset */ + cur_offset += (cf->chunks_nr + 1) * CHUNK_LOOKUP_WIDTH; + + for (i = 0; i < cf->chunks_nr; i++) { + hashwrite_be32(cf->f, cf->chunks[i].id); + hashwrite_be64(cf->f, cur_offset); + + cur_offset += cf->chunks[i].size; + } + + /* Trailing entry marks the end of the chunks */ + hashwrite_be32(cf->f, 0); + hashwrite_be64(cf->f, cur_offset); + + for (i = 0; i < cf->chunks_nr; i++) { + off_t start_offset = hashfile_total(cf->f); + int result = cf->chunks[i].write_fn(cf->f, data); + + if (result) + return result; + + if (hashfile_total(cf->f) - start_offset != cf->chunks[i].size) + BUG("expected to write %"PRId64" bytes to chunk %"PRIx32", but wrote %"PRId64" instead", + cf->chunks[i].size, cf->chunks[i].id, + hashfile_total(cf->f) - start_offset); + } + + return 0; +} diff --git a/chunk-format.h b/chunk-format.h new file mode 100644 index 000000000000..9a1d770accec --- /dev/null +++ b/chunk-format.h @@ -0,0 +1,19 @@ +#ifndef CHUNK_FORMAT_H +#define CHUNK_FORMAT_H + +#include "git-compat-util.h" + +struct hashfile; +struct chunkfile; + +struct chunkfile *init_chunkfile(struct hashfile *f); +void free_chunkfile(struct chunkfile *cf); +int get_num_chunks(struct chunkfile *cf); +typedef int (*chunk_write_fn)(struct hashfile *f, void *data); +void add_chunk(struct chunkfile *cf, + uint32_t id, + size_t size, + chunk_write_fn fn); +int write_chunkfile(struct chunkfile *cf, void *data); + +#endif -- gitgitgadget