87 lines
1.9 KiB
C++
87 lines
1.9 KiB
C++
/*
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*
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* (C) Copyright IBM Corp. 1998-2010 - All Rights Reserved
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*
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*/
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#ifndef __LESWAPS_H
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#define __LESWAPS_H
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#include "LETypes.h"
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/**
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* \file
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* \brief C++ API: Endian independent access to data for LayoutEngine
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*/
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U_NAMESPACE_BEGIN
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/**
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* A convenience macro which invokes the swapWord member function
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* from a concise call.
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*
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* @stable ICU 2.8
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*/
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#define SWAPW(value) LESwaps::swapWord((le_uint16)(value))
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/**
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* A convenience macro which invokes the swapLong member function
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* from a concise call.
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*
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* @stable ICU 2.8
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*/
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#define SWAPL(value) LESwaps::swapLong((le_uint32)(value))
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/**
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* This class is used to access data which stored in big endian order
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* regardless of the conventions of the platform.
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*
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* All methods are static and inline in an attempt to induce the compiler
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* to do most of the calculations at compile time.
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*
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* @stable ICU 2.8
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*/
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class U_LAYOUT_API LESwaps /* not : public UObject because all methods are static */ {
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public:
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/**
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* This method does the byte swap required on little endian platforms
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* to correctly access a (16-bit) word.
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*
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* @param value - the word to be byte swapped
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*
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* @return the byte swapped word
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*
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* @stable ICU 2.8
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*/
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static le_uint16 swapWord(le_uint16 value)
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{
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return (le_uint16)((value << 8) | (value >> 8));
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};
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/**
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* This method does the byte swapping required on little endian platforms
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* to correctly access a (32-bit) long.
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*
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* @param value - the long to be byte swapped
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*
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* @return the byte swapped long
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*
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* @stable ICU 2.8
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*/
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static le_uint32 swapLong(le_uint32 value)
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{
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return (le_uint32)(
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(value << 24) |
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((value << 8) & 0xff0000) |
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((value >> 8) & 0xff00) |
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(value >> 24));
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};
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private:
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LESwaps() {} // private - forbid instantiation
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};
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U_NAMESPACE_END
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#endif
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