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Diffstat (limited to 'include/git2/object.h')
-rw-r--r-- | include/git2/object.h | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/include/git2/object.h b/include/git2/object.h new file mode 100644 index 0000000..6384aaa --- /dev/null +++ b/include/git2/object.h @@ -0,0 +1,279 @@ +/* + * Copyright (C) the libgit2 contributors. All rights reserved. + * + * This file is part of libgit2, distributed under the GNU GPL v2 with + * a Linking Exception. For full terms see the included COPYING file. + */ +#ifndef INCLUDE_git_object_h__ +#define INCLUDE_git_object_h__ + +#include "common.h" +#include "types.h" +#include "oid.h" +#include "buffer.h" + +/** + * @file git2/object.h + * @brief Git revision object management routines + * @defgroup git_object Git revision object management routines + * @ingroup Git + * @{ + */ +GIT_BEGIN_DECL + +#define GIT_OBJECT_SIZE_MAX UINT64_MAX + +/** + * Lookup a reference to one of the objects in a repository. + * + * The generated reference is owned by the repository and + * should be closed with the `git_object_free` method + * instead of free'd manually. + * + * The 'type' parameter must match the type of the object + * in the odb; the method will fail otherwise. + * The special value 'GIT_OBJECT_ANY' may be passed to let + * the method guess the object's type. + * + * @param object pointer to the looked-up object + * @param repo the repository to look up the object + * @param id the unique identifier for the object + * @param type the type of the object + * @return 0 or an error code + */ +GIT_EXTERN(int) git_object_lookup( + git_object **object, + git_repository *repo, + const git_oid *id, + git_object_t type); + +/** + * Lookup a reference to one of the objects in a repository, + * given a prefix of its identifier (short id). + * + * The object obtained will be so that its identifier + * matches the first 'len' hexadecimal characters + * (packets of 4 bits) of the given 'id'. + * 'len' must be at least GIT_OID_MINPREFIXLEN, and + * long enough to identify a unique object matching + * the prefix; otherwise the method will fail. + * + * The generated reference is owned by the repository and + * should be closed with the `git_object_free` method + * instead of free'd manually. + * + * The 'type' parameter must match the type of the object + * in the odb; the method will fail otherwise. + * The special value 'GIT_OBJECT_ANY' may be passed to let + * the method guess the object's type. + * + * @param object_out pointer where to store the looked-up object + * @param repo the repository to look up the object + * @param id a short identifier for the object + * @param len the length of the short identifier + * @param type the type of the object + * @return 0 or an error code + */ +GIT_EXTERN(int) git_object_lookup_prefix( + git_object **object_out, + git_repository *repo, + const git_oid *id, + size_t len, + git_object_t type); + + +/** + * Lookup an object that represents a tree entry. + * + * @param out buffer that receives a pointer to the object (which must be freed + * by the caller) + * @param treeish root object that can be peeled to a tree + * @param path relative path from the root object to the desired object + * @param type type of object desired + * @return 0 on success, or an error code + */ +GIT_EXTERN(int) git_object_lookup_bypath( + git_object **out, + const git_object *treeish, + const char *path, + git_object_t type); + +/** + * Get the id (SHA1) of a repository object + * + * @param obj the repository object + * @return the SHA1 id + */ +GIT_EXTERN(const git_oid *) git_object_id(const git_object *obj); + +/** + * Get a short abbreviated OID string for the object + * + * This starts at the "core.abbrev" length (default 7 characters) and + * iteratively extends to a longer string if that length is ambiguous. + * The result will be unambiguous (at least until new objects are added to + * the repository). + * + * @param out Buffer to write string into + * @param obj The object to get an ID for + * @return 0 on success, <0 for error + */ +GIT_EXTERN(int) git_object_short_id(git_buf *out, const git_object *obj); + +/** + * Get the object type of an object + * + * @param obj the repository object + * @return the object's type + */ +GIT_EXTERN(git_object_t) git_object_type(const git_object *obj); + +/** + * Get the repository that owns this object + * + * Freeing or calling `git_repository_close` on the + * returned pointer will invalidate the actual object. + * + * Any other operation may be run on the repository without + * affecting the object. + * + * @param obj the object + * @return the repository who owns this object + */ +GIT_EXTERN(git_repository *) git_object_owner(const git_object *obj); + +/** + * Close an open object + * + * This method instructs the library to close an existing + * object; note that git_objects are owned and cached by the repository + * so the object may or may not be freed after this library call, + * depending on how aggressive is the caching mechanism used + * by the repository. + * + * IMPORTANT: + * It *is* necessary to call this method when you stop using + * an object. Failure to do so will cause a memory leak. + * + * @param object the object to close + */ +GIT_EXTERN(void) git_object_free(git_object *object); + +/** + * Convert an object type to its string representation. + * + * The result is a pointer to a string in static memory and + * should not be free()'ed. + * + * @param type object type to convert. + * @return the corresponding string representation. + */ +GIT_EXTERN(const char *) git_object_type2string(git_object_t type); + +/** + * Convert a string object type representation to it's git_object_t. + * + * @param str the string to convert. + * @return the corresponding git_object_t. + */ +GIT_EXTERN(git_object_t) git_object_string2type(const char *str); + +/** + * Determine if the given git_object_t is a valid loose object type. + * + * @param type object type to test. + * @return true if the type represents a valid loose object type, + * false otherwise. + */ +GIT_EXTERN(int) git_object_typeisloose(git_object_t type); + +/** + * Recursively peel an object until an object of the specified type is met. + * + * If the query cannot be satisfied due to the object model, + * GIT_EINVALIDSPEC will be returned (e.g. trying to peel a blob to a + * tree). + * + * If you pass `GIT_OBJECT_ANY` as the target type, then the object will + * be peeled until the type changes. A tag will be peeled until the + * referenced object is no longer a tag, and a commit will be peeled + * to a tree. Any other object type will return GIT_EINVALIDSPEC. + * + * If peeling a tag we discover an object which cannot be peeled to + * the target type due to the object model, GIT_EPEEL will be + * returned. + * + * You must free the returned object. + * + * @param peeled Pointer to the peeled git_object + * @param object The object to be processed + * @param target_type The type of the requested object (a GIT_OBJECT_ value) + * @return 0 on success, GIT_EINVALIDSPEC, GIT_EPEEL, or an error code + */ +GIT_EXTERN(int) git_object_peel( + git_object **peeled, + const git_object *object, + git_object_t target_type); + +/** + * Create an in-memory copy of a Git object. The copy must be + * explicitly free'd or it will leak. + * + * @param dest Pointer to store the copy of the object + * @param source Original object to copy + * @return 0 or an error code + */ +GIT_EXTERN(int) git_object_dup(git_object **dest, git_object *source); + +#ifdef GIT_EXPERIMENTAL_SHA256 +/** + * Analyzes a buffer of raw object content and determines its validity. + * Tree, commit, and tag objects will be parsed and ensured that they + * are valid, parseable content. (Blobs are always valid by definition.) + * An error message will be set with an informative message if the object + * is not valid. + * + * @warning This function is experimental and its signature may change in + * the future. + * + * @param valid Output pointer to set with validity of the object content + * @param buf The contents to validate + * @param len The length of the buffer + * @param object_type The type of the object in the buffer + * @param oid_type The object ID type for the OIDs in the given buffer + * @return 0 on success or an error code + */ +GIT_EXTERN(int) git_object_rawcontent_is_valid( + int *valid, + const char *buf, + size_t len, + git_object_t object_type, + git_oid_t oid_type); +#else +/** + * Analyzes a buffer of raw object content and determines its validity. + * Tree, commit, and tag objects will be parsed and ensured that they + * are valid, parseable content. (Blobs are always valid by definition.) + * An error message will be set with an informative message if the object + * is not valid. + * + * @warning This function is experimental and its signature may change in + * the future. + * + * @param valid Output pointer to set with validity of the object content + * @param buf The contents to validate + * @param len The length of the buffer + * @param object_type The type of the object in the buffer + * @return 0 on success or an error code + */ +GIT_EXTERN(int) git_object_rawcontent_is_valid( + int *valid, + const char *buf, + size_t len, + git_object_t object_type); +#endif + +/** @} */ +GIT_END_DECL + +#endif |