thodg/got/include/got_object.h

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• Show log

  Commit

• Author : Stefan Sperling
  Date : 2018-07-12 19:05:28
  Hash : dbc6a6b6
  Message : allow going back to previously blamed commits in tog blame

• 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_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 *);
  
  struct got_commit_object {
  	struct got_object_id *tree_id;
  	unsigned int nparents;
  	struct got_object_id_queue parent_ids;
  	char *author;
  	struct tm tm_author;	/* UTC */
  	char *committer;
  	struct tm tm_committer;	/* UTC */
  	char *logmsg;
  
  	int refcnt; /* for internal use only */
  };
  
  /* A generic object. Used as a handle which holds an ID and an object type. */
  struct got_object;
  #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(struct got_object_id *, 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 copy of an object's ID.
   * The caller should dispose of it with free(3).
   */
  struct got_object_id *got_object_get_id(struct got_object *);
  
  /*
   * Get a newly allocated copy of an object's ID string.
   * The caller should dispose of it with free(3).
   */
  const struct got_error *got_object_get_id_str(char **, struct got_object *);
  
  /*
   * Obtain the type of an object.
   * Returns one of the GOT_OBJ_TYPE_x values (see above).
   */
  int got_object_get_type(struct got_object *);
  
  /*
   * Attempt to open the object in a repository with the provided ID.
   * Caller must dispose of it with got_object_close().
   */
  const struct got_error *got_object_open(struct got_object **,
      struct got_repository *, struct got_object_id *);
  
  /*
   * Attempt to map the provided ID string to an object ID and then
   * attempt to open the object in a repository with this ID.
   * The form of an ID string depends on the hash function used by the
   * repository format (currently SHA1).
   * Caller must dispose of the object with got_object_close().
   */
  const struct got_error *got_object_open_by_id_str(struct got_object **,
      struct got_repository *, const char *);
  
  /* Dispose of an object. */
  void got_object_close(struct got_object *);
  
  /*
   * Attempt to open a commit object in a repository.
   * The provided object must be of type GOT_OBJ_TYPE_COMMIT.
   * The caller must dispose of the commit with got_object_commit_close().
   */
  const struct got_error *got_object_commit_open(struct got_commit_object **,
      struct got_repository *, struct got_object *);
  
  /* Dispose of a commit object. */
  void got_object_commit_close(struct got_commit_object *);
  
  /*
   * Attempt to open a tree object in a repository.
   * The provided object must be of type GOT_OBJ_TYPE_TREE.
   * The caller must dispose of the tree with got_object_tree_close().
   */
  const struct got_error *got_object_tree_open(struct got_tree_object **,
      struct got_repository *, struct got_object *);
  
  /* 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 *);
  
  /*
   * Attempt to open a blob object in a repository.
   * The provided object must be of type GOT_OBJ_TYPE_BLOB.
   * 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_blob_open(struct got_blob_object **,
      struct got_repository *, struct got_object *, size_t);
  
  /* Dispose of a blob object. */
  void got_object_blob_close(struct got_blob_object *);
  
  /*
   * Write the string representation of the object ID of a blob to a buffer.
   * The size_t argument speficies the size of the buffer. In the current
   * implementation, it must be at least SHA1_DIGEST_STRING_LENGTH bytes.
   * XXX This is a bad API, use got_object_id_str() instead.
   */
  char *got_object_blob_id_str(struct got_blob_object*, char *, size_t);
  
  /*
   * 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 first size_t output argument, and the number of lines
   * in the file in the second size_t output argument (NULL can be passed
   * for either output argument).
   */
  const struct got_error *got_object_blob_dump_to_file(size_t *, size_t *,
      FILE *, struct got_blob_object *);
  
  const struct got_error *
  got_object_open_as_commit(struct got_commit_object **,
      struct got_repository *, struct got_object_id *);
  const struct got_error *
  got_object_open_as_tree(struct got_tree_object **,
      struct got_repository *, struct got_object_id *);
  const struct got_error *
  got_object_open_as_blob(struct got_blob_object **,
      struct got_repository *, struct got_object_id *, size_t);
  
  const struct got_error *
  got_object_open_by_path(struct got_object **, struct got_repository *,
      struct got_object_id *, const char *);
  
  const struct got_error *got_object_commit_add_parent(struct got_commit_object *,
      const char *);