thodg/got/include/got_object.h

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• Show log

  Commit

• Author : Stefan Sperling
  Date : 2019-02-01 22:16:47
  Hash : 0bd18d37
  Message : add potentially useful helpers for tag objects and refs

• include/got_object.h

• /*
   * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  struct got_object_id;
  
  struct got_blob_object;
  struct got_tree_object;
  struct got_tag_object;
  struct got_commit_object;
  
  struct got_tree_entry {
  	SIMPLEQ_ENTRY(got_tree_entry) entry;
  	mode_t mode;
  	char *name;
  	struct got_object_id *id;
  };
  
  SIMPLEQ_HEAD(got_tree_entries_queue, got_tree_entry);
  
  struct got_tree_entries {
  	int nentries;
  	struct got_tree_entries_queue head;
  };
  
  struct got_object_qid {
  	SIMPLEQ_ENTRY(got_object_qid) entry;
  	struct got_object_id *id;
  };
  
  SIMPLEQ_HEAD(got_object_id_queue, got_object_qid);
  
  const struct got_error *got_object_qid_alloc(struct got_object_qid **,
      struct got_object_id *);
  void got_object_qid_free(struct got_object_qid *);
  
  /* Object types. */
  #define GOT_OBJ_TYPE_COMMIT		1
  #define GOT_OBJ_TYPE_TREE		2
  #define GOT_OBJ_TYPE_BLOB		3
  #define GOT_OBJ_TYPE_TAG		4
  /* 5 is reserved */
  #define GOT_OBJ_TYPE_OFFSET_DELTA	6
  #define GOT_OBJ_TYPE_REF_DELTA		7
  
  struct got_repository;
  
  /*
   * Obtain a string representation of an object ID. The output depends on
   * the hash function used by the repository format (currently SHA1).
   */
  const struct got_error *got_object_id_str(char **, struct got_object_id *);
  
  /*
   * Compare two object IDs. Return value behaves like memcmp(3).
   */
  int got_object_id_cmp(const struct got_object_id *,
      const struct got_object_id *);
  
  /*
   * Created a newly allocated copy of an object ID.
   * The caller should dispose of it with free(3).
   */
  struct got_object_id *got_object_id_dup(struct got_object_id *);
  
  /*
   * Get a newly allocated ID of the object which resides at the specified
   * path in the tree of the specified commit.
   * The caller should dispose of it with free(3).
   */
  const struct got_error *
  got_object_id_by_path(struct got_object_id **, struct got_repository *,
      struct got_object_id *, const char *);
  
  /*
   * Obtain the type of an object.
   * Returns one of the GOT_OBJ_TYPE_x values (see above).
   */
  const struct got_error *got_object_get_type(int *, struct got_repository *,
      struct got_object_id *);
  
  /*
   * Attempt to resolve the textual representation of an object ID
   * to the ID of an existing object in the repository.
   * The caller should dispose of the ID with free(3).
   */
  const struct got_error *
  got_object_resolve_id_str(struct got_object_id **, struct got_repository *,
      const char *);
  
  /*
   * Attempt to open a commit object in a repository.
   * The caller must dispose of the commit with got_object_commit_close().
   */
  const struct got_error *
  got_object_open_as_commit(struct got_commit_object **,
      struct got_repository *, struct got_object_id *);
  
  /* Dispose of a commit object. */
  void got_object_commit_close(struct got_commit_object *);
  
  /* Obtain the ID of the tree created in a commit. */
  struct got_object_id *got_object_commit_get_tree_id(struct got_commit_object *);
  
  /* Obtain the number of parent commits of a commit. */
  int got_object_commit_get_nparents(struct got_commit_object *);
  
  /* Obtain the list of parent commits of a commit. */
  const struct got_object_id_queue *got_object_commit_get_parent_ids(
      struct got_commit_object *);
  
  /* Get the author's name and email address. */
  const char *got_object_commit_get_author(struct got_commit_object *);
  
  /* Get an author's commit timestamp in UTC. */
  time_t got_object_commit_get_author_time(struct got_commit_object *);
  
  /* Get an author's timezone offset. */
  time_t got_object_commit_get_author_gmtoff(struct got_commit_object *);
  
  /* Get the committer's name and email address. */
  const char *got_object_commit_get_committer(struct got_commit_object *);
  
  /* Get a committer's commit timestamp in UTC. */
  time_t got_object_commit_get_committer_time(struct got_commit_object *);
  
  /* Get a committer's timezone offset. */
  time_t got_object_commit_get_committer_gmtoff(struct got_commit_object *);
  
  /* Get the commit log message. */
  const char *got_object_commit_get_logmsg(struct got_commit_object *);
  
  /*
   * Attempt to open a tree object in a repository.
   * The caller must dispose of the tree with got_object_tree_close().
   */
  const struct got_error *
  got_object_open_as_tree(struct got_tree_object **,
      struct got_repository *, struct got_object_id *);
  
  /* Dispose of a tree object. */
  void got_object_tree_close(struct got_tree_object *);
  
  /* Get the entries of a tree object. */
  const struct got_tree_entries *got_object_tree_get_entries(
      struct got_tree_object *);
  
  /*
   * Compare two trees and indicate whether the entry at the specified path
   * differs between them. The path must not be the root path "/"; the function
   * got_object_id_cmp() should be used instead to compare the tree roots.
   */
  const struct got_error *got_object_tree_path_changed(int *,
      struct got_tree_object *, struct got_tree_object *, const char *,
      struct got_repository *);
  
  /*
   * Attempt to open a blob object in a repository.
   * The size_t argument specifies the block size of an associated read buffer.
   * The caller must dispose of the blob with got_object_blob_close().
   */
  const struct got_error *
  got_object_open_as_blob(struct got_blob_object **,
      struct got_repository *, struct got_object_id *, size_t);
  
  /* Dispose of a blob object. */
  void got_object_blob_close(struct got_blob_object *);
  
  /*
   * Get the length of header data at the beginning of the blob's read buffer.
   * Note that header data is only present upon the first invocation of
   * got_object_blob_read_block() after the blob is opened.
   */
  size_t got_object_blob_get_hdrlen(struct got_blob_object *);
  
  /*
   * Get a pointer to the blob's read buffer.
   * The read buffer is filled by got_object_blob_read_block().
   */
  const uint8_t *got_object_blob_get_read_buf(struct got_blob_object *);
  
  /*
   * Read the next chunk of data from a blob, up to the blob's read buffer
   * block size. The size_t output argument indicates how many bytes have
   * been read into the blob's read buffer. Zero bytes will be reported if
   * all data in the blob has been read.
   */
  const struct got_error *got_object_blob_read_block(size_t *,
      struct got_blob_object *);
  
  /*
   * Read the entire content of a blob and write it to the specified file.
   * Flush and rewind the file as well. Indicate the amount of bytes
   * written in the size_t output argument, and the number of lines in
   * the file in int argument (NULL can be passed for either output argument).
   */
  const struct got_error *got_object_blob_dump_to_file(size_t *, int *,
      FILE *, struct got_blob_object *);
  
  /*
   * Attempt to open a tag object in a repository.
   * The caller must dispose of the tree with got_object_tag_close().
   */
  const struct got_error *got_object_open_as_tag(struct got_tag_object **,
      struct got_repository *, struct got_object_id *);
  
  /* Dispose of a tag object. */
  void got_object_tag_close(struct got_tag_object *);
  
  /* Get type of the object a tag points to. */
  int got_object_tag_get_object_type(struct got_tag_object *);
  
  /*
   * Get ID of the object a tag points to.
   * This must not be freed by the caller. Use got_object_id_dup() if needed.
   */
  struct got_object_id *got_object_tag_get_object_id(struct got_tag_object *);
  
  const struct got_error *got_object_commit_add_parent(struct got_commit_object *,
      const char *);