The Tor Browser: gfx/graphite2/src/inc/Endian.h@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /*  GRAPHITE2 LICENSING

     3     Copyright 2011, SIL International

     4     All rights reserved.

     6     This library is free software; you can redistribute it and/or modify

     7     it under the terms of the GNU Lesser General Public License as published

     8     by the Free Software Foundation; either version 2.1 of License, or

     9     (at your option) any later version.

    11     This program is distributed in the hope that it will be useful,

    12     but WITHOUT ANY WARRANTY; without even the implied warranty of

    13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    14     Lesser General Public License for more details.

    16     You should also have received a copy of the GNU Lesser General Public

    17     License along with this library in the file named "LICENSE".

    18     If not, write to the Free Software Foundation, 51 Franklin Street,

    19     Suite 500, Boston, MA 02110-1335, USA or visit their web page on the

    20     internet at http://www.fsf.org/licenses/lgpl.html.

    22 Alternatively, the contents of this file may be used under the terms of the

    23 Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public

    24 License, as published by the Free Software Foundation, either version 2

    25 of the License or (at your option) any later version.

    26 */

    28 /*

    29 Description:

    30     A set of fast template based decoders for decoding values of any C integer

    31     type up to long int size laid out with most significant byte first or least

    32     significant byte first (aka big endian or little endian).  These are CPU

    33     byte order agnostic and will function the same regardless of the CPUs native

    34     byte order.

    36     Being template based means if the either le or be class is not used then

    37     template code of unused functions will not be instantiated by the compiler

    38     and thus shouldn't cause any overhead.

    39 */

    41 #include <cstddef>

    43 #pragma once

    46 class be

    47 {

    48     template<int S>

    49     inline static unsigned long int _peek(const unsigned char * p) {

    50         return _peek<S/2>(p) << (S/2)*8 | _peek<S/2>(p+S/2);

    51     }

    52 public:

    53     template<typename T>

    54     inline static T peek(const void * p) {

    55         return T(_peek<sizeof(T)>(static_cast<const unsigned char *>(p)));

    56     }

    58     template<typename T>

    59     inline static T read(const unsigned char * &p) {

    60         const T r = T(_peek<sizeof(T)>(p));

    61         p += sizeof r;

    62         return r;

    63     }

    65     template<typename T>

    66     inline static T swap(const T x) {

    67         return T(_peek<sizeof(T)>(reinterpret_cast<const unsigned char *>(&x)));

    68     }

    70     template<typename T>

    71     inline static void skip(const unsigned char * &p, size_t n=1) {

    72         p += sizeof(T)*n;

    73     }

    74 };

    76 template<>

    77 inline unsigned long int be::_peek<1>(const unsigned char * p) { return *p; }

    80 class le

    81 {

    82     template<int S>

    83     inline static unsigned long int _peek(const unsigned char * p) {

    84         return _peek<S/2>(p) | _peek<S/2>(p+S/2)  << (S/2)*8;

    85     }

    86 public:

    87     template<typename T>

    88     inline static T peek(const void * p) {

    89         return T(_peek<sizeof(T)>(static_cast<const unsigned char *>(p)));

    90     }

    92     template<typename T>

    93     inline static T read(const unsigned char * &p) {

    94         const T r = T(_peek<sizeof(T)>(p));

    95         p += sizeof r;

    96         return r;

    97     }

    99     template<typename T>

   100     inline static T swap(const T x) {

   101         return T(_peek<sizeof(T)>(reinterpret_cast<const unsigned char *>(&x)));

   102     }

   104     template<typename T>

   105     inline static void skip(const unsigned char * &p, size_t n=1) {

   106         p += sizeof(T)*n;

   107     }

   108 };

   110 template<>

   111 inline unsigned long int le::_peek<1>(const unsigned char * p) { return *p; }

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