thodg/libgit2/src/git/odb.h

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• Hash : ec250c6e
  Author :
  Date : 2008-11-23T22:37:55
  

  Remove config.h and make fileops an internal API
  
  Since it doesn't make sense to make the disk access stuff
  portable *AND* public (that's a job for each application
  imo), we can take a shortcut and just support unixy stuff
  for now and get away with coding most of it as macros.
  
  Since we go with an internal API for starters and only
  provide higher-level API's to the libgit users, we'll be
  ok with this approach.
  
  Signed-off-by: Andreas Ericsson <ae@op5.se>
  Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
  

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• src/git/odb.h

• #ifndef INCLUDE_git_odb_h__
  #define INCLUDE_git_odb_h__
  
  #include "common.h"
  #include "oid.h"
  #include <stdlib.h>
  
  /**
   * @file git/odb.h
   * @brief Git object database routines
   * @defgroup git_odb Git object database routines
   * @ingroup Git
   * @{
   */
  GIT_BEGIN_DECL
  
  /** An open object database handle. */
  typedef struct git_odb git_odb;
  
  /**
   * Open an object database for read/write access.
   * @param out location to store the database pointer, if opened.
   *            Set to NULL if the open failed.
   * @param objects_dir path of the database's "objects" directory.
   * @return GIT_SUCCESS if the database opened; otherwise an error
   *         code describing why the open was not possible.
   */
  GIT_EXTERN(int) git_odb_open(git_odb **out, const char *objects_dir);
  
  /**
   * Close an open object database.
   * @param db database pointer to close.  If NULL no action is taken.
   */
  GIT_EXTERN(void) git_odb_close(git_odb *db);
  
  /** Basic type (loose or packed) of any Git object. */
  typedef enum {
  	GIT_OBJ_BAD = -1,       /**< Object is invalid. */
  	GIT_OBJ__EXT1 = 0,      /**< Reserved for future use. */
  	GIT_OBJ_COMMIT = 1,     /**< A commit object. */
  	GIT_OBJ_TREE = 2,       /**< A tree (directory listing) object. */
  	GIT_OBJ_BLOB = 3,       /**< A file revision object. */
  	GIT_OBJ_TAG = 4,        /**< An annotated tag object. */
  	GIT_OBJ__EXT2 = 5,      /**< Reserved for future use. */
  	GIT_OBJ_OFS_DELTA = 6,  /**< A delta, base is given by an offset. */
  	GIT_OBJ_REF_DELTA = 7,  /**< A delta, base is given by object id. */
  } git_otype;
  
  /** A small object read from the database. */
  typedef struct {
  	void *data;          /**< Raw, decompressed object data. */
  	size_t len;          /**< Total number of bytes in data. */
  	git_otype type;      /**< Type of this object. */
  } git_obj;
  
  /**
   * Read a small object from the database.
   *
   * If GIT_ENOTFOUND then out->data is set to NULL.
   *
   * @param out object descriptor to populate upon reading.
   * @param db database to search for the object in.
   * @param id identity of the object to read.
   * @return
   * - GIT_SUCCESS if the object was read;
   * - GIT_ENOTFOUND if the object is not in the database.
   */
  GIT_EXTERN(int) git_odb_read(git_obj *out, git_odb *db, const git_oid *id);
  
  /**
   * Read a small object from the database using only pack files.
   *
   * If GIT_ENOTFOUND then out->data is set to NULL.
   *
   * @param out object descriptor to populate upon reading.
   * @param db database to search for the object in.
   * @param id identity of the object to read.
   * @return
   * - GIT_SUCCESS if the object was read.
   * - GIT_ENOTFOUND if the object is not in the database.
   */
  GIT_EXTERN(int) git_odb__read_packed(git_obj *out, git_odb *db, const git_oid *id);
  
  /**
   * Read a small object from the database using only loose object files.
   *
   * If GIT_ENOTFOUND then out->data is set to NULL.
   *
   * @param out object descriptor to populate upon reading.
   * @param db database to search for the object in.
   * @param id identity of the object to read.
   * @return
   * - GIT_SUCCESS if the object was read.
   * - GIT_ENOTFOUND if the object is not in the database.
   */
  GIT_EXTERN(int) git_odb__read_loose(git_obj *out, git_odb *db, const git_oid *id);
  
  /**
   * Release all memory used by the sobj structure.
   *
   * As a result of this call, obj->data will be set to NULL.
   *
   * If obj->data is already NULL, nothing happens.
   *
   * @param obj object descriptor to free.
   */
  GIT_INLINE(void) git_obj_close(git_obj *obj)
  {
  	free(obj->data);
  	obj->data = NULL;
  }
  
  /** @} */
  GIT_END_DECL
  #endif
  

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