exstorob.c

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/******************************************************************************
 *
 * Module Name: exstorob - AML Interpreter object store support, store to object
 *
 *****************************************************************************/

/******************************************************************************
 *
 * 1. Copyright Notice
 *
 * Some or all of this work - Copyright (c) 1999 - 2011, 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.
 *
 *****************************************************************************/

#define __EXSTOROB_C__

#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 */

        ACPI_MEMSET (TargetDesc->Buffer.Pointer, 0, TargetDesc->Buffer.Length);
        ACPI_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 */

        ACPI_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
         */
        ACPI_MEMSET (TargetDesc->String.Pointer, 0,
            (ACPI_SIZE) TargetDesc->String.Length + 1);
        ACPI_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;
        ACPI_MEMCPY (TargetDesc->String.Pointer, Buffer, Length);
    }

    /* Set the new target length */

    TargetDesc->String.Length = Length;
    return_ACPI_STATUS (AE_OK);
}