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/src/os/psp/ftk_mmap_psp.c

http://ftk.googlecode.com/
C | 111 lines | 61 code | 21 blank | 29 comment | 14 complexity | 47998e8d591076b3caafb8d1cdf9049a MD5 | raw file
  1/*
  2 * File: ftk_mmap_psp.c
  3 * Author:  Tao Yu <yut616@gmail.com>
  4 * Brief:   psp 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 * 2010-03-11 Tao Yu <yut616@gmail.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	int fd;
 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	ssize_t ret = 0;
 56	return_val_if_fail(filename != NULL, NULL);
 57	
 58	return_val_if_fail(stat(filename, &st) == 0, NULL);
 59	return_val_if_fail(offset < st.st_size, NULL);
 60
 61	size = (offset + size) <= st.st_size ? size : st.st_size - offset;
 62
 63	thiz = FTK_ZALLOC(sizeof(FtkMmap));
 64	return_val_if_fail(thiz != NULL, NULL);
 65
 66	thiz->fd = open(filename, O_RDONLY);
 67	if(thiz->fd > 0)
 68	{
 69		thiz->length = size;
 70		thiz->data = FTK_ZALLOC(size);
 71		ret = read(thiz->fd, thiz->data, size);
 72	}
 73
 74	if(thiz->data == NULL || ret != size)
 75	{
 76		close(thiz->fd);
 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		close(thiz->fd);
103		FTK_ZFREE(thiz->data, thiz->length);
104
105		FTK_ZFREE(thiz, sizeof(*thiz));
106	}
107
108	return;
109}
110
111