/src/os/windows/ftk_mmap_win32.c

  1/*
  2 * File: ftk_mmap_win32.c
  3 * Author:  Li XianJing <xianjimli@hotmail.com>
  4 * Brief:   win32 mmap implemention.
  5 *
  6 * Copyright (c) 2009 - 2010  Li XianJing <xianjimli@hotmail.com>
  7 *
  8 * Licensed under the Academic Free License version 2.1
  9 *
 10 * This program is free software; you can redistribute it and/or modify
 11 * it under the terms of the GNU General Public License as published by
 12 * the Free Software Foundation; either version 2 of the License, or
 13 * (at your option) any later version.
 14 *
 15 * This program is distributed in the hope that it will be useful,
 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 18 * GNU General Public License for more details.
 19 *
 20 * You should have received a copy of the GNU General Public License
 21 * along with this program; if not, write to the Free Software
 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 23 */
 24
 25/*
 26 * History:
 27 * ================================================================
 28 * 2010-01-06 Li XianJing <xianjimli@hotmail.com> created
 29 *
 30 */
 31
 32#include "ftk_log.h"
 33#include "ftk_mmap.h"
 34#include "ftk_allocator.h"

 35
 36struct _FtkMmap
 37{
 38	FILE* fp;
 39	void* data;
 40	size_t length;
 41};
 42
 43int      ftk_mmap_exist(const char* filename)
 44{
 45	struct stat st = {0};
 46	return_val_if_fail(filename != NULL, 0);
 47
 48	return stat(filename, &st) == 0;
 49}
 50
 51FtkMmap* ftk_mmap_create(const char* filename, size_t offset, size_t size)
 52{
 53	FtkMmap* thiz = NULL;
 54	struct stat st = {0};
 55	return_val_if_fail(filename != NULL, NULL);
 56	
 57	return_val_if_fail(stat(filename, &st) == 0, NULL);
 58	return_val_if_fail(offset < (size_t)st.st_size, NULL);
 59
 60	size = (offset + size) <= (size_t)st.st_size ? size : st.st_size - offset;
 61
 62	thiz = FTK_ZALLOC(sizeof(FtkMmap));
 63	return_val_if_fail(thiz != NULL, NULL);
 64
 65	thiz->fp = fopen(filename, "rb");
 66	if(thiz->fp != NULL)
 67	{
 68		thiz->length = size;
 69		thiz->data = FTK_ZALLOC(size+1);
 70		fseek(thiz->fp, offset, SEEK_SET);
 71		fread(thiz->data, thiz->length, 1, thiz->fp);
 72		fclose(thiz->fp);
 73	}
 74
 75	if(thiz->data == NULL || thiz->data == NULL)
 76	{
 77		FTK_ZFREE(thiz, sizeof(*thiz));
 78		ftk_logd("%s mmap %s failed.\n", __func__, filename);
 79	}
 80
 81	return thiz;
 82}
 83
 84void*    ftk_mmap_data(FtkMmap* thiz)
 85{
 86	return_val_if_fail(thiz != NULL, NULL);
 87
 88	return thiz->data;
 89}
 90
 91size_t   ftk_mmap_length(FtkMmap* thiz)
 92{
 93	return_val_if_fail(thiz != NULL, 0);
 94
 95	return thiz->length;
 96}
 97
 98void     ftk_mmap_destroy(FtkMmap* thiz)
 99{
100	if(thiz != NULL)
101	{
102		FTK_FREE(thiz->data);
103		FTK_ZFREE(thiz, sizeof(*thiz));
104	}
105
106	return;
107}
108
109