thodg/libgit2/src/fileops.h

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• Hash : c3da9f06
  Author :
  Date : 2011-07-21T22:55:20
  

  Add git_futils_readbuffer_updated This extends the git_fuitls_readbuffer function to only read in if the file's modification date is later than the given one. Some code paths want to check a file's modification date in order to decide whether they should read it or not. If they do want to read it, another stat call is done by futils. This function combines these two operations so we avoid one stat call each time we read a new or updated file. The git_futils_readbuffer functions is now a wrapper around the new function. Signed-off-by: Carlos Martín Nieto <cmn@elego.de>

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• src/fileops.h

• /*
   * fileops.h - OS agnostic disk io operations
   *
   * This header describes the strictly internal part of the api
   */
  #ifndef INCLUDE_fileops_h__
  #define INCLUDE_fileops_h__
  
  #include "common.h"
  #include "map.h"
  #include "dir.h"
  #include "posix.h"
  #include "path.h"
  
  /**
   * Filebuffer methods
   *
   * Read whole files into an in-memory buffer for processing
   */
  #define GIT_FBUFFER_INIT {NULL, 0}
  
  typedef struct {  /* file io buffer  */
  	void *data;  /* data bytes   */
  	size_t len;  /* data length  */
  } git_fbuffer;
  
  extern int git_futils_readbuffer(git_fbuffer *obj, const char *path);
  extern int git_futils_readbuffer_updated(git_fbuffer *obj, const char *path, time_t *mtime, int *updated);
  extern void git_futils_freebuffer(git_fbuffer *obj);
  
  /**
   * File utils
   *
   * These are custom filesystem-related helper methods. They are
   * rather high level, and wrap the underlying POSIX methods
   *
   * All these methods return GIT_SUCCESS on success,
   * or an error code on failure and an error message is set.
   */
  
  /**
   * Check if a file exists and can be accessed.
   */
  extern int git_futils_exists(const char *path);
  
  /**
   * Create and open a file, while also
   * creating all the folders in its path
   */
  extern int git_futils_creat_withpath(const char *path, int mode);
  
  /**
   * Create an open a process-locked file
   */
  extern int git_futils_creat_locked(const char *path, int mode);
  
  /**
   * Create an open a process-locked file, while
   * also creating all the folders in its path
   */
  extern int git_futils_creat_locked_withpath(const char *path, int mode);
  
  /**
   * Check if the given path points to a directory
   */
  extern int git_futils_isdir(const char *path);
  
  /**
   * Check if the given path points to a regular file
   */
  extern int git_futils_isfile(const char *path);
  
  /**
   * Create a path recursively
   */
  extern int git_futils_mkdir_r(const char *path, int mode);
  
  /**
   * Create all the folders required to contain
   * the full path of a file
   */
  extern int git_futils_mkpath2file(const char *path);
  
  extern int git_futils_rmdir_r(const char *path, int force);
  
  /**
   * Create and open a temporary file with a `_git2_` suffix
   */
  extern int git_futils_mktmp(char *path_out, const char *filename);
  
  /**
   * Atomically rename a file on the filesystem
   */
  extern int git_futils_mv_atomic(const char *from, const char *to);
  
  /**
   * Move a file on the filesystem, create the
   * destination path if it doesn't exist
   */
  extern int git_futils_mv_withpath(const char *from, const char *to);
  
  
  /**
   * Get the filesize in bytes of a file
   */
  extern git_off_t git_futils_filesize(git_file fd);
  
  /**
   * Read-only map all or part of a file into memory.
   * When possible this function should favor a virtual memory
   * style mapping over some form of malloc()+read(), as the
   * data access will be random and is not likely to touch the
   * majority of the region requested.
   *
   * @param out buffer to populate with the mapping information.
   * @param fd open descriptor to configure the mapping from.
   * @param begin first byte to map, this should be page aligned.
   * @param end number of bytes to map.
   * @return
   * - GIT_SUCCESS on success;
   * - GIT_EOSERR on an unspecified OS related error.
   */
  extern int git_futils_mmap_ro(
  	git_map *out,
  	git_file fd,
  	git_off_t begin,
  	size_t len);
  
  /**
   * Release the memory associated with a previous memory mapping.
   * @param map the mapping description previously configured.
   */
  extern void git_futils_mmap_free(git_map *map);
  
  /**
   * Walk each directory entry, except '.' and '..', calling fn(state).
   *
   * @param pathbuf buffer the function reads the initial directory
   * 		path from, and updates with each successive entry's name.
   * @param pathmax maximum allocation of pathbuf.
   * @param fn function to invoke with each entry.  The first arg is
   *		the input state and the second arg is pathbuf.  The function
   *		may modify the pathbuf, but only by appending new text.
   * @param state to pass to fn as the first arg.
   */
  extern int git_futils_direach(
  	char *pathbuf,
  	size_t pathmax,
  	int (*fn)(void *, char *),
  	void *state);
  
  extern int git_futils_cmp_path(const char *name1, int len1, int isdir1,
  		const char *name2, int len2, int isdir2);
  
  #endif /* INCLUDE_fileops_h__ */
  

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