1 // Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 //

    15 

    16 #include <3gplibrary/mp4config.h>

    17 

    18 /*

    19  * Function:

    20  *

    21  *   mp4_u16 u16endian(mp4_u16 u)

    22  *

    23  * Description:

    24  *

    25  *   This function converts the input parameter u between network byte

    26  *   order (big endian) and current computer byte order.

    27  *

    28  *   Note: Intel based Windows system is little endian.

    29  *         ARM based Symbian OS is little endian.

    30  *

    31  * Parameters:

    32  *

    33  *   u     Input value

    34  *

    35  * Return value:

    36  *

    37  *   Converted value

    38  *

    39  */

    40 mp4_u16 u16endian(mp4_u16 u)

    41 {

    42   mp4_u16 result;

    43 

    44   ((mp4_u8 *)&result)[0] = ((mp4_u8 *)&u)[1];

    45   ((mp4_u8 *)&result)[1] = ((mp4_u8 *)&u)[0];

    46 

    47   return result;

    48 }

    49 

    50 

    51 /*

    52  * Function:

    53  *

    54  *   mp4_u32 u32endian(mp4_u32 u)

    55  *

    56  * Description:

    57  *

    58  *   This function converts the input parameter u between network byte

    59  *   order (big endian) and current computer byte order.

    60  *

    61  *   Note: Intel based Windows system is little endian.

    62  *         ARM based Symbian OS is little endian.

    63  *

    64  * Parameters:

    65  *

    66  *   u     Input value

    67  *

    68  * Return value:

    69  *

    70  *   Converted value

    71  *

    72  */

    73 mp4_u32 u32endian(mp4_u32 u)

    74 {

    75   mp4_u32 result;

    76 

    77   ((mp4_u8 *)&result)[0] = ((mp4_u8 *)&u)[3];

    78   ((mp4_u8 *)&result)[1] = ((mp4_u8 *)&u)[2];

    79   ((mp4_u8 *)&result)[2] = ((mp4_u8 *)&u)[1];

    80   ((mp4_u8 *)&result)[3] = ((mp4_u8 *)&u)[0];

    81 

    82   return result;

    83 }

    84 

    85 

    86 /*

    87  * Function:

    88  *

    89  *   mp4_i32 i32endian(mp4_i32 i)

    90  *

    91  * Description:

    92  *

    93  *   This function converts the input parameter i between network byte

    94  *   order (big endian) and current computer byte order.

    95  *

    96  *   Note: Intel based Windows system is little endian.

    97  *         ARM based Symbian OS is little endian.

    98  *

    99  * Parameters:

   100  *

   101  *   i     Input value

   102  *

   103  * Return value:

   104  *

   105  *   Converted value

   106  *

   107  */

   108 mp4_i32 i32endian(mp4_i32 i)

   109 {

   110   mp4_i32 result;

   111 

   112   ((mp4_u8 *)&result)[0] = ((mp4_u8 *)&i)[3];

   113   ((mp4_u8 *)&result)[1] = ((mp4_u8 *)&i)[2];

   114   ((mp4_u8 *)&result)[2] = ((mp4_u8 *)&i)[1];

   115   ((mp4_u8 *)&result)[3] = ((mp4_u8 *)&i)[0];

   116 

   117   return result;

   118 }

   119 

   120 

   121 /*

   122  * Function:

   123  *

   124  *   mp4_u64 u64endian(mp4_u64 u)

   125  *

   126  * Description:

   127  *

   128  *   This function converts the input parameter u between network byte

   129  *   order (big endian) and current computer byte order.

   130  *

   131  *   Note: Intel based Windows system is little endian.

   132  *         ARM based Symbian OS is little endian.

   133  *

   134  * Parameters:

   135  *

   136  *   u     Input value

   137  *

   138  * Return value:

   139  *

   140  *   Converted value

   141  *

   142  */

   143 mp4_u64 u64endian(mp4_u64 u)

   144 {

   145   mp4_u64 result;

   146 

   147   ((mp4_u8 *)&result)[0] = ((mp4_u8 *)&u)[7];

   148   ((mp4_u8 *)&result)[1] = ((mp4_u8 *)&u)[6];

   149   ((mp4_u8 *)&result)[2] = ((mp4_u8 *)&u)[5];

   150   ((mp4_u8 *)&result)[3] = ((mp4_u8 *)&u)[4];

   151   ((mp4_u8 *)&result)[4] = ((mp4_u8 *)&u)[3];

   152   ((mp4_u8 *)&result)[5] = ((mp4_u8 *)&u)[2];

   153   ((mp4_u8 *)&result)[6] = ((mp4_u8 *)&u)[1];

   154   ((mp4_u8 *)&result)[7] = ((mp4_u8 *)&u)[0];

   155 

   156   return result;

   157 }

   158 

   159 // End of File