mono/utils/mono-filemap.c

   1 /*
   2  * mono-filemap.c: Unix/Windows implementation for filemap.
   3  *
   4  * Author:
   5  *   Paolo Molaro (lupus@ximian.com)
   6  *
   7  * Copyright 2008-2008 Novell, Inc.
   8  */
   9
  10 #include "config.h"
  11
  12 #if HAVE_SYS_STAT_H
  13 #include <sys/stat.h>
  14 #endif
  15 #include <fcntl.h>
  16 #include <string.h>
  17 #ifdef HAVE_UNISTD_H
  18 #include <unistd.h>
  19 #endif
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22
  23 #include "mono-mmap.h"
  24
  25 MonoFileMap *
  26 mono_file_map_open (const char* name)
  27 {
  28 #ifdef WIN32
  29         gunichar2 *wname = g_utf8_to_utf16 (name, -1, 0, 0, 0);
  30         MonoFileMap *result;
  31
  32         if (wname == NULL)
  33                 return NULL;
  34         result = (MonoFileMap *) _wfopen ((wchar_t *) wname, L"rb");
  35         g_free (wname);
  36         return result;
  37 #else
  38         return (MonoFileMap *)fopen (name, "rb");
  39 #endif
  40 }
  41
  42 guint64
  43 mono_file_map_size (MonoFileMap *fmap)
  44 {
  45         struct stat stat_buf;
  46         if (fstat (fileno ((FILE*)fmap), &stat_buf) < 0)
  47                 return 0;
  48         return stat_buf.st_size;
  49 }
  50
  51 int
  52 mono_file_map_fd (MonoFileMap *fmap)
  53 {
  54         return fileno ((FILE*)fmap);
  55 }
  56
  57 int
  58 mono_file_map_close (MonoFileMap *fmap)
  59 {
  60         return fclose ((FILE*)fmap);
  61 }
  62
  63 #if !defined (HOST_WIN32)
  64
  65 static mono_file_map_alloc_fn alloc_fn = (mono_file_map_alloc_fn) malloc;
  66 static mono_file_map_release_fn release_fn = (mono_file_map_release_fn) free;
  67
  68 void
  69 mono_file_map_set_allocator (mono_file_map_alloc_fn alloc, mono_file_map_release_fn release)
  70 {
  71         alloc_fn = alloc == NULL     ? (mono_file_map_alloc_fn) malloc : alloc;
  72         release_fn = release == NULL ? (mono_file_map_release_fn) free : release;
  73 }
  74
  75 void *
  76 mono_file_map_fileio (size_t length, int flags, int fd, guint64 offset, void **ret_handle)
  77 {
  78         guint64 cur_offset;
  79         size_t bytes_read;
  80         void *ptr = (*alloc_fn) (length);
  81         if (!ptr)
  82                 return NULL;
  83         cur_offset = lseek (fd, 0, SEEK_CUR);
  84         if (lseek (fd, offset, SEEK_SET) != offset) {
  85                 (*release_fn) (ptr);
  86                 return NULL;
  87         }
  88         bytes_read = read (fd, ptr, length);
  89         if (bytes_read != length)
  90                 return NULL;
  91         lseek (fd, cur_offset, SEEK_SET);
  92         *ret_handle = NULL;
  93         return ptr;
  94 }
  95
  96 int
  97 mono_file_unmap_fileio (void *addr, void *handle)
  98 {
  99         (*release_fn) (addr);
 100         return 0;
 101 }
 102 #if !defined(HAVE_MMAP)
 103 void *
 104 mono_file_map (size_t length, int flags, int fd, guint64 offset, void **ret_handle)
 105 {
 106         return mono_file_map_fileio (length, flags, fd, offset, ret_handle);
 107 }
 108
 109 int
 110 mono_file_unmap (void *addr, void *handle)
 111 {
 112         return mono_file_unmap_fileio(addr, handle);
 113 }
 114 #endif
 115 #endif