src/fileops.h

   1 /*
   2  * fileops.h - OS agnostic disk io operations
   3  *
   4  * This header describes the strictly internal part of the api
   5  */
   6 #ifndef INCLUDE_fileops_h__
   7 #define INCLUDE_fileops_h__
   8
   9 #include "common.h"
  10 #include "map.h"
  11 #include "dir.h"
  12 #include <fcntl.h>
  13 #include <time.h>
  14
  15 #ifdef GIT_WIN32
  16 GIT_INLINE(int) link(const char *GIT_UNUSED(old), const char *GIT_UNUSED(new))
  17 {
  18         GIT_UNUSED_ARG(old)
  19         GIT_UNUSED_ARG(new)
  20         errno = ENOSYS;
  21         return -1;
  22 }
  23
  24 GIT_INLINE(int) git__mkdir(const char *path, int GIT_UNUSED(mode))
  25 {
  26         GIT_UNUSED_ARG(mode)
  27         return mkdir(path);
  28 }
  29
  30 extern int git__unlink(const char *path);
  31 extern int git__mkstemp(char *template);
  32 extern int git__fsync(int fd);
  33
  34 # ifndef GIT__WIN32_NO_HIDE_FILEOPS
  35 #  define unlink(p) git__unlink(p)
  36 #  define mkstemp(t) git__mkstemp(t)
  37 #  define mkdir(p,m) git__mkdir(p, m)
  38 #  define fsync(fd) git__fsync(fd)
  39 # endif
  40 #endif  /* GIT_WIN32 */
  41
  42
  43 #if !defined(O_BINARY)
  44 #define O_BINARY 0
  45 #endif
  46
  47 #define GITFO_BUF_INIT {NULL, 0}
  48
  49 typedef int git_file;
  50 typedef struct gitfo_cache gitfo_cache;
  51
  52 typedef struct {  /* file io buffer  */
  53         void *data;  /* data bytes   */
  54         size_t len;  /* data length  */
  55 } gitfo_buf;
  56
  57 extern int gitfo_exists(const char *path);
  58 extern int gitfo_open(const char *path, int flags);
  59 extern int gitfo_creat(const char *path, int mode);
  60 extern int gitfo_isdir(const char *path);
  61 #define gitfo_close(fd) close(fd)
  62
  63 extern int gitfo_read(git_file fd, void *buf, size_t cnt);
  64 extern int gitfo_write(git_file fd, void *buf, size_t cnt);
  65 #define gitfo_lseek(f,n,w) lseek(f, n, w)
  66 extern off_t gitfo_size(git_file fd);
  67
  68 extern int gitfo_read_file(gitfo_buf *obj, const char *path);
  69 extern void gitfo_free_buf(gitfo_buf *obj);
  70 extern int gitfo_move_file(char *from, char *to);
  71
  72 #define gitfo_stat(p,b) stat(p, b)
  73 #define gitfo_fstat(f,b) fstat(f, b)
  74
  75 #define gitfo_unlink(p) unlink(p)
  76 #define gitfo_rmdir(p) rmdir(p)
  77 #define gitfo_chdir(p) chdir(p)
  78 #define gitfo_mkdir(p,m) mkdir(p, m)
  79
  80 #define gitfo_mkstemp(t) mkstemp(t)
  81 #define gitfo_fsync(fd) fsync(fd)
  82 #define gitfo_chmod(p,m) chmod(p, m)
  83
  84 /**
  85  * Read-only map all or part of a file into memory.
  86  * When possible this function should favor a virtual memory
  87  * style mapping over some form of malloc()+read(), as the
  88  * data access will be random and is not likely to touch the
  89  * majority of the region requested.
  90  *
  91  * @param out buffer to populate with the mapping information.
  92  * @param fd open descriptor to configure the mapping from.
  93  * @param begin first byte to map, this should be page aligned.
  94  * @param end number of bytes to map.
  95  * @return
  96  * - GIT_SUCCESS on success;
  97  * - GIT_EOSERR on an unspecified OS related error.
  98  */
  99 extern int gitfo_map_ro(
 100         git_map *out,
 101         git_file fd,
 102         off_t begin,
 103         size_t len);
 104
 105 /**
 106  * Release the memory associated with a previous memory mapping.
 107  * @param map the mapping description previously configured.
 108  */
 109 extern void gitfo_free_map(git_map *map);
 110
 111 /**
 112  * Walk each directory entry, except '.' and '..', calling fn(state).
 113  *
 114  * @param pathbuf buffer the function reads the initial directory
 115  *              path from, and updates with each successive entry's name.
 116  * @param pathmax maximum allocation of pathbuf.
 117  * @param fn function to invoke with each entry.  The first arg is
 118  *              the input state and the second arg is pathbuf.  The function
 119  *              may modify the pathbuf, but only by appending new text.
 120  * @param state to pass to fn as the first arg.
 121  */
 122 extern int gitfo_dirent(
 123         char *pathbuf,
 124         size_t pathmax,
 125         int (*fn)(void *, char *),
 126         void *state);
 127
 128 extern gitfo_cache *gitfo_enable_caching(git_file fd, size_t cache_size);
 129 extern int gitfo_write_cached(gitfo_cache *ioc, void *buf, size_t len);
 130 extern int gitfo_flush_cached(gitfo_cache *ioc);
 131 extern int gitfo_close_cached(gitfo_cache *ioc);
 132
 133 #endif /* INCLUDE_fileops_h__ */