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Diffstat (limited to 'Build/source/libs/icu/icu-xetex/layout/LESwaps.h')
-rw-r--r-- | Build/source/libs/icu/icu-xetex/layout/LESwaps.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/Build/source/libs/icu/icu-xetex/layout/LESwaps.h b/Build/source/libs/icu/icu-xetex/layout/LESwaps.h new file mode 100644 index 00000000000..5309139d673 --- /dev/null +++ b/Build/source/libs/icu/icu-xetex/layout/LESwaps.h @@ -0,0 +1,87 @@ + +/* + * + * (C) Copyright IBM Corp. 1998-2008 - All Rights Reserved + * + */ + +#ifndef __LESWAPS_H +#define __LESWAPS_H + +#include "LETypes.h" + +/** + * \file + * \brief C++ API: Endian independent access to data for LayoutEngine + */ + +U_NAMESPACE_BEGIN + +/** + * A convenience macro which invokes the swapWord member function + * from a concise call. + * + * @stable ICU 2.8 + */ +#define SWAPW(value) LESwaps::swapWord((const le_uint16 &) (value)) + +/** + * A convenience macro which invokes the swapLong member function + * from a concise call. + * + * @stable ICU 2.8 + */ +#define SWAPL(value) LESwaps::swapLong((const le_uint32 &) (value)) + +/** + * This class is used to access data which stored in big endian order + * regardless of the conventions of the platform. + * + * All methods are static and inline in an attempt to induce the compiler + * to do most of the calculations at compile time. + * + * @stable ICU 2.8 + */ +class U_LAYOUT_API LESwaps /* not : public UObject because all methods are static */ { +public: + + /** + * This method does the byte swap required on little endian platforms + * to correctly access a (16-bit) word. + * + * @param value - the word to be byte swapped + * + * @return the byte swapped word + * + * @stable ICU 2.8 + */ + static le_uint16 swapWord(const le_uint16 &value) + { + const le_uint8 *p = (const le_uint8 *) &value; + + return ((p[0] << 8) + p[1]); + }; + + /** + * This method does the byte swapping required on little endian platforms + * to correctly access a (32-bit) long. + * + * @param value - the long to be byte swapped + * + * @return the byte swapped long + * + * @stable ICU 2.8 + */ + static le_uint32 swapLong(const le_uint32 &value) + { + const le_uint8 *p = (const le_uint8 *) &value; + + return ((p[0] << 24) + (p[1] << 16) + (p[2] << 8) + p[3]); + }; + +private: + LESwaps() {} // private - forbid instantiation +}; + +U_NAMESPACE_END +#endif |