utils.c revision 5ccecfd26d2a7c3a79a139f0118b93ee64be4737 
1/*
2 * Copyright (c) 2009-2013, Google Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *  * Neither the name of Google, Inc. nor the names of its contributors
15 *    may be used to endorse or promote products derived from this
16 *    software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
25 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
28 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31#include <sys/types.h>
32#include <sys/stat.h>
33#include <unistd.h>
34#include <stdio.h>
35#include <sys/ioctl.h>
36#include <linux/fs.h>
37#include <stdlib.h>
38
39#include "utils.h"
40#include "debug.h"
41
42#ifndef BLKDISCARD
43#define BLKDISCARD _IO(0x12,119)
44#endif
45
46#ifndef BLKSECDISCARD
47#define BLKSECDISCARD _IO(0x12,125)
48#endif
49
50
51int get_stream_size(FILE *stream) {
52    int size;
53    fseek(stream, 0, SEEK_END);
54    size = ftell(stream);
55    fseek(stream, 0, SEEK_SET);
56    return size;
57}
58
59uint64_t get_block_device_size(int fd)
60{
61    uint64_t size = 0;
62    int ret;
63
64    ret = ioctl(fd, BLKGETSIZE64, &size);
65
66    if (ret)
67        return 0;
68
69    return size;
70}
71
72uint64_t get_file_size(int fd)
73{
74    struct stat buf;
75    int ret;
76    int64_t computed_size;
77
78    ret = fstat(fd, &buf);
79    if (ret)
80        return 0;
81
82    if (S_ISREG(buf.st_mode))
83        computed_size = buf.st_size;
84    else if (S_ISBLK(buf.st_mode))
85        computed_size = get_block_device_size(fd);
86    else
87        computed_size = 0;
88
89    return computed_size;
90}
91
92uint64_t get_file_size64(int fd)
93{
94    struct stat64 buf;
95    int ret;
96    uint64_t computed_size;
97
98    ret = fstat64(fd, &buf);
99    if (ret)
100        return 0;
101
102    if (S_ISREG(buf.st_mode))
103        computed_size = buf.st_size;
104    else if (S_ISBLK(buf.st_mode))
105        computed_size = get_block_device_size(fd);
106    else
107        computed_size = 0;
108
109    return computed_size;
110}
111
112
113char *strip(char *str)
114{
115    int n;
116
117    n = strspn(str, " \t");
118    str += n;
119    n = strcspn(str, " \t");
120    str[n] = '\0';
121
122    return str;
123}
124
125int wipe_block_device(int fd, int64_t len)
126{
127    uint64_t range[2];
128    int ret;
129
130    range[0] = 0;
131    range[1] = len;
132    ret = ioctl(fd, BLKSECDISCARD, &range);
133    if (ret < 0) {
134        range[0] = 0;
135        range[1] = len;
136        ret = ioctl(fd, BLKDISCARD, &range);
137        if (ret < 0) {
138            D(WARN, "Discard failed\n");
139            return 1;
140        } else {
141            D(WARN, "Wipe via secure discard failed, used discard instead\n");
142            return 0;
143        }
144    }
145
146    return 0;
147}
148
149int create_temp_file() {
150    char tempname[] = "/dev/fastboot_data_XXXXXX";
151    int fd;
152
153    fd = mkstemp(tempname);
154    if (fd < 0)
155        return -1;
156
157    unlink(tempname);
158
159    return fd;
160}
161