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 /******************************************************************************
  *
  * Module Name: exstorob - AML object store support, store to object
  *
  *****************************************************************************/
 
 /******************************************************************************
  *
  * 1. Copyright Notice
  *
  * Some or all of this work - Copyright (c) 1999 - 2024, 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 "acpi.h"
 #include "accommon.h"
 #include "acinterp.h"
 
 
 #define _COMPONENT          ACPI_EXECUTER
         ACPI_MODULE_NAME    ("exstorob")
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiExStoreBufferToBuffer
  *
  * PARAMETERS:  SourceDesc          - Source object to copy
  *              TargetDesc          - Destination object of the copy
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Copy a buffer object to another buffer object.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiExStoreBufferToBuffer (
     ACPI_OPERAND_OBJECT     *SourceDesc,
     ACPI_OPERAND_OBJECT     *TargetDesc)
 {
     UINT32                  Length;
     UINT8                   *Buffer;
 
 
     ACPI_FUNCTION_TRACE_PTR (ExStoreBufferToBuffer, SourceDesc);
 
 
     /* If Source and Target are the same, just return */
 
     if (SourceDesc == TargetDesc)
     {
         return_ACPI_STATUS (AE_OK);
     }
 
     /* We know that SourceDesc is a buffer by now */
 
     Buffer = ACPI_CAST_PTR (UINT8, SourceDesc->Buffer.Pointer);
     Length = SourceDesc->Buffer.Length;
 
     /*
      * If target is a buffer of length zero or is a static buffer,
      * allocate a new buffer of the proper length
      */
     if ((TargetDesc->Buffer.Length == 0) ||
         (TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER))
     {
         TargetDesc->Buffer.Pointer = ACPI_ALLOCATE (Length);
         if (!TargetDesc->Buffer.Pointer)
         {
             return_ACPI_STATUS (AE_NO_MEMORY);
         }
 
         TargetDesc->Buffer.Length = Length;
     }
 
     /* Copy source buffer to target buffer */
 
     if (Length <= TargetDesc->Buffer.Length)
     {
         /* Clear existing buffer and copy in the new one */
 
         memset (TargetDesc->Buffer.Pointer, 0, TargetDesc->Buffer.Length);
         memcpy (TargetDesc->Buffer.Pointer, Buffer, Length);
 
 #ifdef ACPI_OBSOLETE_BEHAVIOR
         /*
          * NOTE: ACPI versions up to 3.0 specified that the buffer must be
          * truncated if the string is smaller than the buffer. However, "other"
          * implementations of ACPI never did this and thus became the defacto
          * standard. ACPI 3.0A changes this behavior such that the buffer
          * is no longer truncated.
          */
 
         /*
          * OBSOLETE BEHAVIOR:
          * If the original source was a string, we must truncate the buffer,
          * according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer
          * copy must not truncate the original buffer.
          */
         if (OriginalSrcType == ACPI_TYPE_STRING)
         {
             /* Set the new length of the target */
 
             TargetDesc->Buffer.Length = Length;
         }
 #endif
     }
     else
     {
         /* Truncate the source, copy only what will fit */
 
         memcpy (TargetDesc->Buffer.Pointer, Buffer,
             TargetDesc->Buffer.Length);
 
         ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
             "Truncating source buffer from %X to %X\n",
             Length, TargetDesc->Buffer.Length));
     }
 
     /* Copy flags */
 
     TargetDesc->Buffer.Flags = SourceDesc->Buffer.Flags;
     TargetDesc->Common.Flags &= ~AOPOBJ_STATIC_POINTER;
     return_ACPI_STATUS (AE_OK);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiExStoreStringToString
  *
  * PARAMETERS:  SourceDesc          - Source object to copy
  *              TargetDesc          - Destination object of the copy
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Copy a String object to another String object
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiExStoreStringToString (
     ACPI_OPERAND_OBJECT     *SourceDesc,
     ACPI_OPERAND_OBJECT     *TargetDesc)
 {
     UINT32                  Length;
     UINT8                   *Buffer;
 
 
     ACPI_FUNCTION_TRACE_PTR (ExStoreStringToString, SourceDesc);
 
 
     /* If Source and Target are the same, just return */
 
     if (SourceDesc == TargetDesc)
     {
         return_ACPI_STATUS (AE_OK);
     }
 
     /* We know that SourceDesc is a string by now */
 
     Buffer = ACPI_CAST_PTR (UINT8, SourceDesc->String.Pointer);
     Length = SourceDesc->String.Length;
 
     /*
      * Replace existing string value if it will fit and the string
      * pointer is not a static pointer (part of an ACPI table)
      */
     if ((Length < TargetDesc->String.Length) &&
        (!(TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER)))
     {
         /*
          * String will fit in existing non-static buffer.
          * Clear old string and copy in the new one
          */
         memset (TargetDesc->String.Pointer, 0,
             (ACPI_SIZE) TargetDesc->String.Length + 1);
         memcpy (TargetDesc->String.Pointer, Buffer, Length);
     }
     else
     {
         /*
          * Free the current buffer, then allocate a new buffer
          * large enough to hold the value
          */
         if (TargetDesc->String.Pointer &&
            (!(TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER)))
         {
             /* Only free if not a pointer into the DSDT */
 
             ACPI_FREE (TargetDesc->String.Pointer);
         }
 
         TargetDesc->String.Pointer =
             ACPI_ALLOCATE_ZEROED ((ACPI_SIZE) Length + 1);
 
         if (!TargetDesc->String.Pointer)
         {
             return_ACPI_STATUS (AE_NO_MEMORY);
         }
 
         TargetDesc->Common.Flags &= ~AOPOBJ_STATIC_POINTER;
         memcpy (TargetDesc->String.Pointer, Buffer, Length);
     }
 
     /* Set the new target length */
 
     TargetDesc->String.Length = Length;
     return_ACPI_STATUS (AE_OK);
 }

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