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83cc70d9fe
This moves some of the odb_backend stuff that is related to the internals of an odb_backend implementation into include/git2/sys. Some of the stuff related to streaming I left in include/git2 because it seemed like it would be reasonably needed by a normal user who wanted to stream objects into and out of the ODB. Also, I added APIs for traversing the list of backends so that some of the tests would not need to access ODB internals.
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/*
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* Copyright (C) the libgit2 contributors. All rights reserved.
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*
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* This file is part of libgit2, distributed under the GNU GPL v2 with
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* a Linking Exception. For full terms see the included COPYING file.
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*/
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#ifndef INCLUDE_sys_git_odb_backend_h__
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#define INCLUDE_sys_git_odb_backend_h__
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#include "git2/common.h"
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#include "git2/types.h"
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#include "git2/oid.h"
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#include "git2/odb.h"
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/**
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* @file git2/sys/backend.h
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* @brief Git custom backend implementors functions
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* @defgroup git_backend Git custom backend APIs
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* @ingroup Git
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* @{
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*/
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GIT_BEGIN_DECL
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/**
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* An instance for a custom backend
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*/
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struct git_odb_backend {
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unsigned int version;
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git_odb *odb;
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/* read and read_prefix each return to libgit2 a buffer which
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* will be freed later. The buffer should be allocated using
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* the function git_odb_backend_malloc to ensure that it can
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* be safely freed later. */
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int (* read)(
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void **, size_t *, git_otype *, git_odb_backend *, const git_oid *);
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/* To find a unique object given a prefix
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* of its oid.
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* The oid given must be so that the
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* remaining (GIT_OID_HEXSZ - len)*4 bits
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* are 0s.
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*/
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int (* read_prefix)(
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git_oid *, void **, size_t *, git_otype *,
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git_odb_backend *, const git_oid *, size_t);
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int (* read_header)(
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size_t *, git_otype *, git_odb_backend *, const git_oid *);
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/* The writer may assume that the object
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* has already been hashed and is passed
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* in the first parameter.
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*/
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int (* write)(
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git_oid *, git_odb_backend *, const void *, size_t, git_otype);
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int (* writestream)(
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git_odb_stream **, git_odb_backend *, size_t, git_otype);
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int (* readstream)(
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git_odb_stream **, git_odb_backend *, const git_oid *);
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int (* exists)(
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git_odb_backend *, const git_oid *);
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int (* refresh)(git_odb_backend *);
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int (* foreach)(
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git_odb_backend *, git_odb_foreach_cb cb, void *payload);
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int (* writepack)(
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git_odb_writepack **, git_odb_backend *,
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git_transfer_progress_callback progress_cb, void *progress_payload);
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void (* free)(git_odb_backend *);
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};
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#define GIT_ODB_BACKEND_VERSION 1
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#define GIT_ODB_BACKEND_INIT {GIT_ODB_BACKEND_VERSION}
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GIT_EXTERN(void *) git_odb_backend_malloc(git_odb_backend *backend, size_t len);
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GIT_END_DECL
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#endif
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