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cmfsize.c revision 1.1 
      1 /******************************************************************************
      2  *
      3  * Module Name: cfsize - Common get file size function
      4  *
      5  *****************************************************************************/
      6 
      7 /*
      8  * Copyright (C) 2000 - 2014, 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.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  *
     55  * FUNCTION:    CmGetFileSize
     56  *
     57  * PARAMETERS:  File                    - Open file descriptor
     58  *
     59  * RETURN:      File Size. On error, -1 (ACPI_UINT32_MAX)
     60  *
     61  * DESCRIPTION: Get the size of a file. Uses seek-to-EOF. File must be open.
     62  *              Does not disturb the current file pointer.
     63  *
     64  ******************************************************************************/
     65 
     66 UINT32
     67 CmGetFileSize (
     68     ACPI_FILE               File)
     69 {
     70     long                    FileSize;
     71     long                    CurrentOffset;
     72     ACPI_STATUS             Status;
     73 
     74 
     75     /* Save the current file pointer, seek to EOF to obtain file size */
     76 
     77     CurrentOffset = AcpiOsGetFileOffset (File);
     78     if (CurrentOffset < 0)
     79     {
     80         goto OffsetError;
     81     }
     82 
     83     Status = AcpiOsSetFileOffset (File, 0, ACPI_FILE_END);
     84     if (ACPI_FAILURE (Status))
     85     {
     86         goto SeekError;
     87     }
     88 
     89     FileSize = AcpiOsGetFileOffset (File);
     90     if (FileSize < 0)
     91     {
     92         goto OffsetError;
     93     }
     94 
     95     /* Restore original file pointer */
     96 
     97     Status = AcpiOsSetFileOffset (File, CurrentOffset, ACPI_FILE_BEGIN);
     98     if (ACPI_FAILURE (Status))
     99     {
    100         goto SeekError;
    101     }
    102 
    103     return ((UINT32) FileSize);
    104 
    105 
    106 OffsetError:
    107     AcpiLogError ("Could not get file offset");
    108     return (ACPI_UINT32_MAX);
    109 
    110 SeekError:
    111     AcpiLogError ("Could not set file offset");
    112     return (ACPI_UINT32_MAX);
    113 }
    114