FreeBSD/Linux Kernel Cross Reference
sys/contrib/dev/acpica/common/acfileio.c

     /******************************************************************************
      *
      * Module Name: acfileio - Get ACPI tables from file
      *
      *****************************************************************************/
     
     /******************************************************************************
      *
      * 1. Copyright Notice
     *
     * Some or all of this work - Copyright (c) 1999 - 2022, Intel Corp.
     * All rights reserved.
     *
     * 2. License
     *
     * 2.1. This is your license from Intel Corp. under its intellectual property
     * rights. You may have additional license terms from the party that provided
     * you this software, covering your right to use that party's intellectual
     * property rights.
     *
     * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
     * copy of the source code appearing in this file ("Covered Code") an
     * irrevocable, perpetual, worldwide license under Intel's copyrights in the
     * base code distributed originally by Intel ("Original Intel Code") to copy,
     * make derivatives, distribute, use and display any portion of the Covered
     * Code in any form, with the right to sublicense such rights; and
     *
     * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
     * license (with the right to sublicense), under only those claims of Intel
     * patents that are infringed by the Original Intel Code, to make, use, sell,
     * offer to sell, and import the Covered Code and derivative works thereof
     * solely to the minimum extent necessary to exercise the above copyright
     * license, and in no event shall the patent license extend to any additions
     * to or modifications of the Original Intel Code. No other license or right
     * is granted directly or by implication, estoppel or otherwise;
     *
     * The above copyright and patent license is granted only if the following
     * conditions are met:
     *
     * 3. Conditions
     *
     * 3.1. Redistribution of Source with Rights to Further Distribute Source.
     * Redistribution of source code of any substantial portion of the Covered
     * Code or modification with rights to further distribute source must include
     * the above Copyright Notice, the above License, this list of Conditions,
     * and the following Disclaimer and Export Compliance provision. In addition,
     * Licensee must cause all Covered Code to which Licensee contributes to
     * contain a file documenting the changes Licensee made to create that Covered
     * Code and the date of any change. Licensee must include in that file the
     * documentation of any changes made by any predecessor Licensee. Licensee
     * must include a prominent statement that the modification is derived,
     * directly or indirectly, from Original Intel Code.
     *
     * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
     * Redistribution of source code of any substantial portion of the Covered
     * Code or modification without rights to further distribute source must
     * include the following Disclaimer and Export Compliance provision in the
     * documentation and/or other materials provided with distribution. In
     * addition, Licensee may not authorize further sublicense of source of any
     * portion of the Covered Code, and must include terms to the effect that the
     * license from Licensee to its licensee is limited to the intellectual
     * property embodied in the software Licensee provides to its licensee, and
     * not to intellectual property embodied in modifications its licensee may
     * make.
     *
     * 3.3. Redistribution of Executable. Redistribution in executable form of any
     * substantial portion of the Covered Code or modification must reproduce the
     * above Copyright Notice, and the following Disclaimer and Export Compliance
     * provision in the documentation and/or other materials provided with the
     * distribution.
     *
     * 3.4. Intel retains all right, title, and interest in and to the Original
     * Intel Code.
     *
     * 3.5. Neither the name Intel nor any other trademark owned or controlled by
     * Intel shall be used in advertising or otherwise to promote the sale, use or
     * other dealings in products derived from or relating to the Covered Code
     * without prior written authorization from Intel.
     *
     * 4. Disclaimer and Export Compliance
     *
     * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
     * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
     * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
     * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
     * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
     * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
     * PARTICULAR PURPOSE.
     *
     * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
     * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
     * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
     * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
     * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
     * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
     * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
     * LIMITED REMEDY.
     *
     * 4.3. Licensee shall not export, either directly or indirectly, any of this
    * software or system incorporating such software without first obtaining any
    * required license or other approval from the U. S. Department of Commerce or
    * any other agency or department of the United States Government. In the
    * event Licensee exports any such software from the United States or
    * re-exports any such software from a foreign destination, Licensee shall
    * ensure that the distribution and export/re-export of the software is in
    * compliance with all laws, regulations, orders, or other restrictions of the
    * U.S. Export Administration Regulations. Licensee agrees that neither it nor
    * any of its subsidiaries will export/re-export any technical data, process,
    * software, or service, directly or indirectly, to any country for which the
    * United States government or any agency thereof requires an export license,
    * other governmental approval, or letter of assurance, without first obtaining
    * such license, approval or letter.
    *
    *****************************************************************************
    *
    * Alternatively, you may choose to be licensed under the terms of the
    * following license:
    *
    * Redistribution and use in source and binary forms, with or without
    * modification, are permitted provided that the following conditions
    * are met:
    * 1. Redistributions of source code must retain the above copyright
    *    notice, this list of conditions, and the following disclaimer,
    *    without modification.
    * 2. Redistributions in binary form must reproduce at minimum a disclaimer
    *    substantially similar to the "NO WARRANTY" disclaimer below
    *    ("Disclaimer") and any redistribution must be conditioned upon
    *    including a substantially similar Disclaimer requirement for further
    *    binary redistribution.
    * 3. Neither the names of the above-listed copyright holders nor the names
    *    of any contributors may be used to endorse or promote products derived
    *    from this software without specific prior written permission.
    *
    * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    *
    * Alternatively, you may choose to be licensed under the terms of the
    * GNU General Public License ("GPL") version 2 as published by the Free
    * Software Foundation.
    *
    *****************************************************************************/
   
   #include <contrib/dev/acpica/include/acpi.h>
   #include <contrib/dev/acpica/include/accommon.h>
   #include <contrib/dev/acpica/include/actables.h>
   #include <contrib/dev/acpica/include/acutils.h>
   #include <contrib/dev/acpica/include/acapps.h>
   
   #define _COMPONENT          ACPI_UTILITIES
           ACPI_MODULE_NAME    ("acfileio")
   
   
   /* Local prototypes */
   
   static ACPI_STATUS
   AcGetOneTableFromFile (
       char                    *Filename,
       FILE                    *File,
       UINT8                   GetOnlyAmlTables,
       ACPI_TABLE_HEADER       **Table);
   
   static ACPI_STATUS
   AcCheckTextModeCorruption (
       ACPI_TABLE_HEADER       *Table);
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcDeleteTableList
    *
    * PARAMETERS:  ListHead            - List to delete
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Delete a list of tables. This is useful for removing memory
    *              allocated by AcGetAllTablesFromFile
    *
    ******************************************************************************/
   
   void
   AcDeleteTableList (
       ACPI_NEW_TABLE_DESC     *ListHead)
   {
       ACPI_NEW_TABLE_DESC     *Current = ListHead;
       ACPI_NEW_TABLE_DESC     *Previous = Current;
   
   
       while (Current)
       {
           Current = Current->Next;
           AcpiOsFree (Previous);
           Previous = Current;
       }
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcGetAllTablesFromFile
    *
    * PARAMETERS:  Filename            - Table filename
    *              GetOnlyAmlTables    - TRUE if the tables must be AML tables
    *              ReturnListHead      - Where table list is returned
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Get all ACPI tables from within a single file.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcGetAllTablesFromFile (
       char                    *Filename,
       UINT8                   GetOnlyAmlTables,
       ACPI_NEW_TABLE_DESC     **ReturnListHead)
   {
       ACPI_NEW_TABLE_DESC     *ListHead = NULL;
       ACPI_NEW_TABLE_DESC     *ListTail = NULL;
       ACPI_NEW_TABLE_DESC     *TableDesc;
       FILE                    *File;
       ACPI_TABLE_HEADER       *Table = NULL;
       UINT32                  FileSize;
       ACPI_STATUS             Status = AE_OK;
   
   
       File = fopen (Filename, "rb");
       if (!File)
       {
           fprintf (stderr, "Could not open input file: %s\n", Filename);
           if (errno == ENOENT)
           {
               return (AE_NOT_EXIST);
           }
   
           return (AE_ERROR);
       }
   
       /* Get the file size */
   
       FileSize = CmGetFileSize (File);
       if (FileSize == ACPI_UINT32_MAX)
       {
           Status = AE_ERROR;
           goto Exit;
       }
   
       fprintf (stderr,
           "Input file %s, Length 0x%X (%u) bytes\n",
           Filename, FileSize, FileSize);
   
       /* We must have at least one ACPI table header */
   
       if (FileSize < sizeof (ACPI_TABLE_HEADER))
       {
           Status = AE_BAD_HEADER;
           goto Exit;
       }
   
       /* Check for an non-binary file */
   
       if (!AcIsFileBinary (File))
       {
           fprintf (stderr,
               "    %s: File does not appear to contain a valid AML table\n",
               Filename);
           Status = AE_TYPE;
           goto Exit;
       }
   
       /* Read all tables within the file */
   
       while (ACPI_SUCCESS (Status))
       {
           /* Get one entire ACPI table */
   
           Status = AcGetOneTableFromFile (
               Filename, File, GetOnlyAmlTables, &Table);
   
           if (Status == AE_CTRL_TERMINATE)
           {
               Status = AE_OK;
               break;
           }
           else if (Status == AE_TYPE)
           {
               Status = AE_OK;
               goto Exit;
           }
           else if (ACPI_FAILURE (Status))
           {
               goto Exit;
           }
   
           /* Print table header for iASL/disassembler only */
   
   #ifdef ACPI_ASL_COMPILER
   
           AcpiTbPrintTableHeader (0, Table);
   #endif
   
           /* Allocate and link a table descriptor */
   
           TableDesc = AcpiOsAllocate (sizeof (ACPI_NEW_TABLE_DESC));
           if (!TableDesc)
           {
               AcpiOsFree (Table);
               Status = AE_NO_MEMORY;
               goto Exit;
           }
   
           TableDesc->Table = Table;
           TableDesc->Next = NULL;
   
           /* Link at the end of the local table list */
   
           if (!ListHead)
           {
               ListHead = TableDesc;
               ListTail = TableDesc;
           }
           else
           {
               ListTail->Next = TableDesc;
               ListTail = TableDesc;
           }
       }
   
       /* Add the local table list to the end of the global list */
   
       if (*ReturnListHead)
       {
           ListTail = *ReturnListHead;
           while (ListTail->Next)
           {
               ListTail = ListTail->Next;
           }
   
           ListTail->Next = ListHead;
       }
       else
       {
           *ReturnListHead = ListHead;
       }
   
   Exit:
       fclose(File);
       return (Status);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcGetOneTableFromFile
    *
    * PARAMETERS:  Filename            - File where table is located
    *              File                - Open FILE pointer to Filename
    *              GetOnlyAmlTables    - TRUE if the tables must be AML tables.
    *              ReturnTable         - Where a pointer to the table is returned
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Read the next ACPI table from a file. Implements support
    *              for multiple tables within a single file. File must already
    *              be open.
    *
    * Note: Loading an RSDP is not supported.
    *
    ******************************************************************************/
   
   static ACPI_STATUS
   AcGetOneTableFromFile (
       char                    *Filename,
       FILE                    *File,
       UINT8                   GetOnlyAmlTables,
       ACPI_TABLE_HEADER       **ReturnTable)
   {
       ACPI_STATUS             Status = AE_OK;
       ACPI_TABLE_HEADER       TableHeader;
       ACPI_TABLE_HEADER       *Table;
       INT32                   Count;
       UINT32                  TableLength;
       UINT32                  HeaderLength;
       long                    TableOffset = 0;
   
       *ReturnTable = NULL;
   
       /* Get the table header to examine signature and length */
       /*
        * Special handling for the CDAT table (both the Length field
        * and the Checksum field are not in the standard positions).
        * (The table header is non-standard).
        */
       if (AcpiGbl_CDAT)
       {
           HeaderLength = sizeof (ACPI_TABLE_CDAT);
       }
       else
       {
           HeaderLength = sizeof (ACPI_TABLE_HEADER);
       }
   
       Status = AcValidateTableHeader (File, TableOffset);
       if (ACPI_FAILURE (Status))
       {
           return (Status);
       }
   
       TableOffset = ftell (File);
       Count = fread (&TableHeader, 1, HeaderLength, File);
       if (Count != (INT32) HeaderLength)
       {
           return (AE_CTRL_TERMINATE);
       }
   
       if (GetOnlyAmlTables)
       {
           /* Validate the table signature/header (limited ASCII chars) */
   
           /*
            * Table must be an AML table (DSDT/SSDT).
            * Used for iASL -e option only.
            */
           if (!AcpiUtIsAmlTable (&TableHeader))
           {
               fprintf (stderr,
                   "    %s: Table [%4.4s] is not an AML table - ignoring\n",
                   Filename, TableHeader.Signature);
   
               return (AE_TYPE);
           }
       }
   
       /*
        * Special handling for the CDAT table (both the Length field
        * and the Checksum field are not in the standard positions).
        */
       if (AcpiGbl_CDAT)
       {
           TableLength = ACPI_CAST_PTR (ACPI_TABLE_CDAT, &TableHeader)->Length;
       }
       else
       {
           TableLength = TableHeader.Length;
       }
   
       /* Allocate a buffer for the entire table */
   
       Table = AcpiOsAllocate ((ACPI_SIZE) TableLength);
       if (!Table)
       {
           return (AE_NO_MEMORY);
       }
   
       /* Read the entire ACPI table, including header */
   
       fseek (File, TableOffset, SEEK_SET);
       Count = fread (Table, 1, TableLength, File);
   
       /*
        * Checks for data table headers happen later in the execution. Only verify
        * for Aml tables at this point in the code.
        */
       if (GetOnlyAmlTables && Count != (INT32) TableLength)
       {
           Status = AE_ERROR;
           goto ErrorExit;
       }
   
       /*
        * Validate the checksum (just issue a warning if incorrect).
        * Note: CDAT is special cased here because the table does
        * not have the checksum field in the standard position.
        */
       if (AcpiGbl_CDAT)
       {
           Status = AcpiUtVerifyCdatChecksum ((ACPI_TABLE_CDAT *) Table, TableLength);
       } else
       {
           Status = AcpiUtVerifyChecksum (Table, TableLength);
       }
   
       if (ACPI_FAILURE (Status))
       {
           Status = AcCheckTextModeCorruption (Table);
           if (ACPI_FAILURE (Status))
           {
               goto ErrorExit;
           }
       }
   
       *ReturnTable = Table;
       return (AE_OK);
   
   
   ErrorExit:
       AcpiOsFree (Table);
       return (Status);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcIsFileBinary
    *
    * PARAMETERS:  File                - Open input file
    *
    * RETURN:      TRUE if file appears to be binary
    *
    * DESCRIPTION: Scan a file for any non-ASCII bytes.
    *
    * Note: Maintains current file position.
    *
    ******************************************************************************/
   
   BOOLEAN
   AcIsFileBinary (
       FILE                    *File)
   {
       UINT8                   Byte;
       BOOLEAN                 IsBinary = FALSE;
       long                    FileOffset;
   
   
       /* Scan entire file for any non-ASCII bytes */
   
       FileOffset = ftell (File);
       while (fread (&Byte, 1, 1, File) == 1)
       {
           if (!isprint (Byte) && !isspace (Byte))
           {
               IsBinary = TRUE;
               goto Exit;
           }
       }
   
   Exit:
       fseek (File, FileOffset, SEEK_SET);
       return (IsBinary);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcValidateTableHeader
    *
    * PARAMETERS:  File                - Open input file
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Determine if a file seems to contain one or more binary ACPI
    *              tables, via the
    *              following checks on what would be the table header:
    *              1) File must be at least as long as an ACPI_TABLE_HEADER
    *              2) There must be enough room in the file to hold entire table
    *              3) Signature, OemId, OemTableId, AslCompilerId must be ASCII
    *
    * Note: There can be multiple definition blocks per file, so we cannot
    * expect/compare the file size to be equal to the table length. 12/2015.
    *
    * Note: Maintains current file position.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcValidateTableHeader (
       FILE                    *File,
       long                    TableOffset)
   {
       ACPI_TABLE_HEADER       TableHeader;
       ACPI_TABLE_CDAT         *CdatTableHeader = ACPI_CAST_PTR (ACPI_TABLE_CDAT, &TableHeader);
       UINT32                  HeaderLength;
       ACPI_SIZE               Actual;
       long                    OriginalOffset;
       UINT32                  FileSize;
       UINT32                  i;
   
   
       ACPI_FUNCTION_TRACE (AcValidateTableHeader);
   
       /* Determine the type of table header */
   
       if (AcpiGbl_CDAT)
       {
           HeaderLength = sizeof (ACPI_TABLE_CDAT);
       }
       else
       {
           HeaderLength = sizeof (ACPI_TABLE_HEADER);
       }
   
       /* Read a potential table header */
   
       OriginalOffset = ftell (File);
       if (fseek (File, TableOffset, SEEK_SET))
       {
           fprintf (stderr, "SEEK error\n");
       }
       Actual = fread (&TableHeader, 1, HeaderLength, File);
       if (fseek (File, OriginalOffset, SEEK_SET))
       {
           fprintf (stderr, "SEEK error\n");
       }
   
       if (Actual < HeaderLength)
       {
           fprintf (stderr,
               "Could not read entire table header: Actual %u, Requested %u\n",
               (UINT32) Actual, HeaderLength);
           return (AE_ERROR);
       }
   
       /* Validate the signature (limited ASCII chars) */
   
       if (!AcpiGbl_CDAT && !AcpiUtValidNameseg (TableHeader.Signature))
       {
           /*
            * The "-ds cdat" option was not used, and the signature is not valid.
            *
            * For CDAT we are assuming that there should be at least one non-ASCII
            * byte in the (normally) 4-character Signature field (at least the
            * high-order byte should be zero). Otherwise, this is OK.
            */
           fprintf (stderr,
               "\nTable appears to be a CDAT table, which has no signature.\n"
               "If this is in fact a CDAT table, use the -ds option on the\n"
               "command line to specify the table type (signature):\n"
               "\"iasl -d -ds CDAT <file>\" or \"iasl -ds CDAT -T CDAT\"\n\n");
   
           return (AE_BAD_SIGNATURE);
       }
   
       /* Validate table length against bytes remaining in the file */
   
       FileSize = CmGetFileSize (File);
       if (!AcpiGbl_CDAT)
       {
           /* Standard ACPI table header */
   
           if (TableHeader.Length > (UINT32) (FileSize - TableOffset))
           {
               fprintf (stderr, "Table [%4.4s] is too long for file - "
                   "needs: 0x%.2X, remaining in file: 0x%.2X\n",
                   TableHeader.Signature, TableHeader.Length,
                   (UINT32) (FileSize - TableOffset));
               return (AE_BAD_HEADER);
           }
       }
       else if (CdatTableHeader->Length > (UINT32) (FileSize - TableOffset))
       {
           /* Special header for CDAT table */
   
           fprintf (stderr, "Table [CDAT] is too long for file - "
               "needs: 0x%.2X, remaining in file: 0x%.2X\n",
               CdatTableHeader->Length,
               (UINT32) (FileSize - TableOffset));
           return (AE_BAD_HEADER);
       }
   
       /* For CDAT table, there are no ASCII fields in the header, we are done */
   
       if (AcpiGbl_CDAT)
       {
           return (AE_OK);
       }
   
       /*
        * These standard fields must be ASCII: OemId, OemTableId, AslCompilerId.
        * We allow a NULL terminator in OemId and OemTableId.
        */
       for (i = 0; i < ACPI_NAMESEG_SIZE; i++)
       {
           if (!ACPI_IS_ASCII ((UINT8) TableHeader.AslCompilerId[i]))
           {
               goto BadCharacters;
           }
       }
   
       for (i = 0; (i < ACPI_OEM_ID_SIZE) && (TableHeader.OemId[i]); i++)
       {
           if (!ACPI_IS_ASCII ((UINT8) TableHeader.OemId[i]))
           {
               goto BadCharacters;
           }
       }
   
       for (i = 0; (i < ACPI_OEM_TABLE_ID_SIZE) && (TableHeader.OemTableId[i]); i++)
       {
           if (!ACPI_IS_ASCII ((UINT8) TableHeader.OemTableId[i]))
           {
               goto BadCharacters;
           }
       }
   
       return (AE_OK);
   
   
   BadCharacters:
   
       ACPI_WARNING ((AE_INFO,
           "Table header for [%4.4s] has invalid ASCII character(s)",
           TableHeader.Signature));
       return (AE_OK);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcCheckTextModeCorruption
    *
    * PARAMETERS:  Table           - Table buffer starting with table header
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Check table for text mode file corruption where all linefeed
    *              characters (LF) have been replaced by carriage return linefeed
    *              pairs (CR/LF).
    *
    ******************************************************************************/
   
   static ACPI_STATUS
   AcCheckTextModeCorruption (
       ACPI_TABLE_HEADER       *Table)
   {
       UINT32                  i;
       UINT32                  Pairs = 0;
       UINT8                   *Buffer = ACPI_CAST_PTR (UINT8, Table);
   
   
       /* Scan entire table to determine if each LF has been prefixed with a CR */
   
       for (i = 1; i < Table->Length; i++)
       {
           if (Buffer[i] == 0x0A)
           {
               if (Buffer[i - 1] != 0x0D)
               {
                   /* The LF does not have a preceding CR, table not corrupted */
   
                   return (AE_OK);
               }
               else
               {
                   /* Found a CR/LF pair */
   
                   Pairs++;
               }
   
               i++;
           }
       }
   
       if (!Pairs)
       {
           return (AE_OK);
       }
   
       /*
        * Entire table scanned, each CR is part of a CR/LF pair --
        * meaning that the table was treated as a text file somewhere.
        *
        * NOTE: We can't "fix" the table, because any existing CR/LF pairs in the
        * original table are left untouched by the text conversion process --
        * meaning that we cannot simply replace CR/LF pairs with LFs.
        */
       AcpiOsPrintf ("Table has been corrupted by text mode conversion\n");
       AcpiOsPrintf ("All LFs (%u) were changed to CR/LF pairs\n", Pairs);
       AcpiOsPrintf ("Table cannot be repaired!\n");
   
       return (AE_BAD_VALUE);
   }

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