1 /****************************************************************************** 2 * 3 * Module Name: cfsize - Common get file size function 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2015, Intel Corp. 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. 61 * Does not disturb the current file pointer. 62 * 63 ******************************************************************************/ 64 u32 cm_get_file_size(ACPI_FILE file) 65 { 66 long file_size; 67 long current_offset; 68 acpi_status status; 69 70 /* Save the current file pointer, seek to EOF to obtain file size */ 71 72 current_offset = acpi_os_get_file_offset(file); 73 if (current_offset < 0) { 74 goto offset_error; 75 } 76 77 status = acpi_os_set_file_offset(file, 0, ACPI_FILE_END); 78 if (ACPI_FAILURE(status)) { 79 goto seek_error; 80 } 81 82 file_size = acpi_os_get_file_offset(file); 83 if (file_size < 0) { 84 goto offset_error; 85 } 86 87 /* Restore original file pointer */ 88 89 status = acpi_os_set_file_offset(file, current_offset, ACPI_FILE_BEGIN); 90 if (ACPI_FAILURE(status)) { 91 goto seek_error; 92 } 93 94 return ((u32)file_size); 95 96 offset_error: 97 acpi_log_error("Could not get file offset"); 98 return (ACPI_UINT32_MAX); 99 100 seek_error: 101 acpi_log_error("Could not set file offset"); 102 return (ACPI_UINT32_MAX); 103 } 104