206 lines
2.7 KiB
C
206 lines
2.7 KiB
C
#ifndef MISC_H_INCLUDED
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#define MISC_H_INCLUDED
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//
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// Endian-conversion routines
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//
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// begin_ntddk
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//
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// Bit Scan Reverse - 0x00010100 -> bit set at 16
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//
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__inline LONG
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NTAPI
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RtlGetMostSigBitSet(
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IN LONG Value
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)
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{
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ULONG Mask = 0x80000000;
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UINT Index = 31;
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while ((Value & Mask) == 0)
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{
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Index--;
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Value <<= 1;
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}
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return Index;
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}
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//
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// Bit Scan Forward - 0x00010100 -> bit set at 9
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//
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__inline LONG
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NTAPI
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RtlGetLeastSigBitSet(
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IN LONG Value
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)
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{
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ULONG Mask = 0x00000001;
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UINT Index = 0;
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while ((Value & Mask) == 0)
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{
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Index++;
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Value >>= 1;
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}
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return Index;
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}
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#if (defined(MIDL_PASS) || defined(__cplusplus) || !defined(_M_IX86))
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//
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// Short integer conversion - 0xABCD -> 0xCDAB
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//
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__inline SHORT
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NTAPI
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RtlConvertEndianShort(
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IN SHORT Value
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)
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{
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return (((Value) & 0xFF00) >> 8) | ((UCHAR)(Value) << 8);
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}
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//
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// Long integer conversion - 0x1234ABCD -> 0xCDAB3412
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//
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__inline LONG
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NTAPI
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RtlConvertEndianLong(
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IN LONG Value
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)
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{
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return (((Value) & 0xFF000000) >> 24) |
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(((Value) & 0x00FF0000) >> 8) |
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(((Value) & 0x0000FF00) << 8) |
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(((UCHAR)(Value)) << 24);
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}
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//
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// Bit Scan Reverse - 0x00010100 -> bit set at 16
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//
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__inline LONG
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NTAPI
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RtlGetMostSigBitSetEx(
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IN LONG Value
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)
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{
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ULONG Mask = 0x80000000;
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UINT Index = 31;
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while ((Value & Mask) == 0)
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{
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Index--;
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Value <<= 1;
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}
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return Index;
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}
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//
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// Bit Scan Forward - 0x00010100 -> bit set at 9
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//
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__inline LONG
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NTAPI
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RtlGetLeastSigBitSetEx(
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IN LONG Value
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)
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{
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ULONG Mask = 0x00000001;
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UINT Index = 0;
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while ((Value & Mask) == 0)
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{
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Index++;
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Value >>= 1;
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}
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return Index;
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}
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#else
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#pragma warning(disable:4035) // re-enable below
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//
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// Short integer conversion - 0xABCD -> 0xCDAB
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//
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__inline SHORT
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NTAPI
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RtlConvertEndianShort(
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IN SHORT Value
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)
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{
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__asm {
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mov ax, Value
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xchg ah, al
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}
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}
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//
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// Long integer conversion - 0x1234ABCD -> 0xCDAB3412
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//
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__inline LONG
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NTAPI
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RtlConvertEndianLong(
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IN LONG Value
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)
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{
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__asm {
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mov eax, Value
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bswap eax
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}
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}
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//
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// Bit Scan Reverse - 0x00010100 -> bit set at 16
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//
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__inline LONG
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NTAPI
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RtlGetMostSigBitSetEx(
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IN LONG Value
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)
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{
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__asm {
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bsr eax, Value
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}
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}
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//
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// Bit Scan Forward - 0x00010100 -> bit set at 9
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//
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__inline LONG
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NTAPI
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RtlGetLeastSigBitSetEx(
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IN LONG Value
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)
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{
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__asm {
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bsf eax, Value
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}
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}
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#pragma warning(default:4035)
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#endif
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// end_ntddk
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#endif // MISC_H_INCLUDED
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