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1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: cfsize - Common get file size function | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
c8100dc4 | 8 | * Copyright (C) 2000 - 2016, Intel Corp. |
e2b9035f LZ |
9 | * All rights reserved. |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * 1. Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions, and the following disclaimer, | |
16 | * without modification. | |
17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
18 | * substantially similar to the "NO WARRANTY" disclaimer below | |
19 | * ("Disclaimer") and any redistribution must be conditioned upon | |
20 | * including a substantially similar Disclaimer requirement for further | |
21 | * binary redistribution. | |
22 | * 3. Neither the names of the above-listed copyright holders nor the names | |
23 | * of any contributors may be used to endorse or promote products derived | |
24 | * from this software without specific prior written permission. | |
25 | * | |
26 | * Alternatively, this software may be distributed under the terms of the | |
27 | * GNU General Public License ("GPL") version 2 as published by the Free | |
28 | * Software Foundation. | |
29 | * | |
30 | * NO WARRANTY | |
31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
41 | * POSSIBILITY OF SUCH DAMAGES. | |
42 | */ | |
43 | ||
44 | #include <acpi/acpi.h> | |
45 | #include "accommon.h" | |
46 | #include "acapps.h" | |
47 | #include <stdio.h> | |
48 | ||
49 | #define _COMPONENT ACPI_TOOLS | |
50 | ACPI_MODULE_NAME("cmfsize") | |
51 | ||
52 | /******************************************************************************* | |
53 | * | |
54 | * FUNCTION: cm_get_file_size | |
55 | * | |
56 | * PARAMETERS: file - Open file descriptor | |
57 | * | |
58 | * RETURN: File Size. On error, -1 (ACPI_UINT32_MAX) | |
59 | * | |
60 | * DESCRIPTION: Get the size of a file. Uses seek-to-EOF. File must be open. | |
3c9349c9 | 61 | * Does not disturb the current file pointer. |
e2b9035f LZ |
62 | * |
63 | ******************************************************************************/ | |
3c9349c9 | 64 | u32 cm_get_file_size(ACPI_FILE file) |
e2b9035f LZ |
65 | { |
66 | long file_size; | |
67 | long current_offset; | |
3c9349c9 | 68 | acpi_status status; |
e2b9035f LZ |
69 | |
70 | /* Save the current file pointer, seek to EOF to obtain file size */ | |
71 | ||
3c9349c9 | 72 | current_offset = acpi_os_get_file_offset(file); |
e2b9035f LZ |
73 | if (current_offset < 0) { |
74 | goto offset_error; | |
75 | } | |
76 | ||
3c9349c9 LZ |
77 | status = acpi_os_set_file_offset(file, 0, ACPI_FILE_END); |
78 | if (ACPI_FAILURE(status)) { | |
e2b9035f LZ |
79 | goto seek_error; |
80 | } | |
81 | ||
3c9349c9 | 82 | file_size = acpi_os_get_file_offset(file); |
e2b9035f LZ |
83 | if (file_size < 0) { |
84 | goto offset_error; | |
85 | } | |
86 | ||
87 | /* Restore original file pointer */ | |
88 | ||
3c9349c9 LZ |
89 | status = acpi_os_set_file_offset(file, current_offset, ACPI_FILE_BEGIN); |
90 | if (ACPI_FAILURE(status)) { | |
e2b9035f LZ |
91 | goto seek_error; |
92 | } | |
93 | ||
94 | return ((u32)file_size); | |
95 | ||
96 | offset_error: | |
3c9349c9 | 97 | acpi_log_error("Could not get file offset"); |
e2b9035f LZ |
98 | return (ACPI_UINT32_MAX); |
99 | ||
100 | seek_error: | |
3c9349c9 | 101 | acpi_log_error("Could not set file offset"); |
e2b9035f LZ |
102 | return (ACPI_UINT32_MAX); |
103 | } |