Line data    Source code

       1             : /******************************************************************************
       2             :  * $Id$
       3             :  *
       4             :  * Project:  FIT Driver
       5             :  * Purpose:  Implement FIT Support - not using the SGI iflFIT library.
       6             :  * Author:   Philip Nemec, nemec@keyholecorp.com
       7             :  *
       8             :  ******************************************************************************
       9             :  * Copyright (c) 2001, Keyhole, Inc.
      10             :  *
      11             :  * Permission is hereby granted, free of charge, to any person obtaining a
      12             :  * copy of this software and associated documentation files (the "Software"),
      13             :  * to deal in the Software without restriction, including without limitation
      14             :  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      15             :  * and/or sell copies of the Software, and to permit persons to whom the
      16             :  * Software is furnished to do so, subject to the following conditions:
      17             :  *
      18             :  * The above copyright notice and this permission notice shall be included
      19             :  * in all copies or substantial portions of the Software.
      20             :  *
      21             :  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
      22             :  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      23             :  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
      24             :  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
      25             :  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
      26             :  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
      27             :  * DEALINGS IN THE SOFTWARE.
      28             :  ****************************************************************************/
      29             : 
      30             : #ifndef gstEndian_h_
      31             : #define gstEndian_h_
      32             : 
      33             : // endian swapping tools
      34             : 
      35             : #include <stdio.h>
      36             : #include "cpl_port.h"
      37             : 
      38             : #include "gstTypes.h"
      39             : 
      40             : namespace gstEndian
      41             : {
      42             : 
      43             : // have to do swapping on Linux and Windows
      44             : #ifdef CPL_LSB
      45             : #define swapping
      46             : #else
      47             : #endif
      48             : 
      49             : #ifdef swapping
      50             : size_t swapped_fread(void *ptr, size_t size, size_t nitems, FILE *stream);
      51             : size_t swapped_fwrite(const void *ptr, size_t size, size_t nitems,
      52             :                       FILE *stream);
      53             : 
      54         506 : static inline void gst_swap64(void *value)
      55             : {
      56             :     // 0x1122334455667788 --> 0x8877665544332211
      57             : 
      58         506 :     *(uint64 *)(value) = (((*(uint64 *)(value)&0x00000000000000ff) << 56) |
      59         506 :                           ((*(uint64 *)(value)&0x000000000000ff00) << 40) |
      60         506 :                           ((*(uint64 *)(value)&0x0000000000ff0000) << 24) |
      61         506 :                           ((*(uint64 *)(value)&0x00000000ff000000) << 8) |
      62         506 :                           ((*(uint64 *)(value) >> 8) & 0x00000000ff000000) |
      63         506 :                           ((*(uint64 *)(value) >> 24) & 0x0000000000ff0000) |
      64         506 :                           ((*(uint64 *)(value) >> 40) & 0x000000000000ff00) |
      65         506 :                           ((*(uint64 *)(value) >> 56) & 0x00000000000000ff));
      66         506 : }
      67             : 
      68        1905 : static inline void gst_swap32(void *value)
      69             : {
      70             :     // 0x12 34 56 78 --> 0x78 56 34 12
      71             : 
      72        1905 :     *(uint32 *)(value) = (((*(uint32 *)(value)&0x000000ff) << 24) |
      73        1905 :                           ((*(uint32 *)(value)&0x0000ff00) << 8) |
      74        1905 :                           ((*(uint32 *)(value) >> 8) & 0x0000ff00) |
      75        1905 :                           ((*(uint32 *)(value) >> 24) & 0x000000ff));
      76        1905 : }
      77             : 
      78         800 : static inline void gst_swap16(void *value)
      79             : {
      80         800 :     *(uint16 *)(value) = (((*(uint16 *)(value)&0x00ff) << 8) |
      81         800 :                           ((*(uint16 *)(value) >> 8) & 0x00ff));
      82         800 : }
      83             : 
      84         811 : static inline void gst_swapbytes(void *value, int size)
      85             : {
      86         811 :     switch (size)
      87             :     {
      88           0 :         case 1:
      89             :             // do nothing
      90           0 :             break;
      91           0 :         case 2:
      92           0 :             gst_swap16(value);
      93           0 :             break;
      94         705 :         case 4:
      95         705 :             gst_swap32(value);
      96         705 :             break;
      97         106 :         case 8:
      98         106 :             gst_swap64(value);
      99         106 :             break;
     100           0 :         default:
     101           0 :             fprintf(stderr,
     102             :                     "gst_swapbytes unsupported size %i - not swapping\n", size);
     103           0 :             break;
     104             :     }  // switch
     105         811 : }
     106             : 
     107             : #define gst_swapb(value) gst_swapbytes(&value, sizeof(value))
     108             : 
     109             : #else  // swapping
     110             : 
     111             : #define swapped_fread(ptr, size, nitems, stream)                               \
     112             :     fread(ptr, size, nitems, stream)
     113             : #define swapped_fwrite(ptr, size, nitems, stream)                              \
     114             :     fwrite(ptr, size, nitems, stream)
     115             : 
     116             : #define gst_swap64(value)
     117             : #define gst_swap32(value)
     118             : #define gst_swap16(value)
     119             : #define gst_swapbytes(value, size)
     120             : #define gst_swapb(value)
     121             : 
     122             : #endif  // swapping
     123             : 
     124             : }  // namespace gstEndian
     125             : 
     126             : #endif  // ! gstEndian_h_