427 lines
12 KiB
C
427 lines
12 KiB
C
/*
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* Large integer functions
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*
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* Copyright 2000 Alexandre Julliard
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* Copyright 2003 Thomas Mertes
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdarg.h>
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#include "ntstatus.h"
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#include "windef.h"
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#include "winbase.h"
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#include "winreg.h"
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#include "winternl.h"
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/*
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* Note: we use LONGLONG instead of LARGE_INTEGER, because
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* the latter is a structure and the calling convention for
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* returning a structure would not be binary-compatible.
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*
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* FIXME: for platforms that don't have a native LONGLONG type,
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* we should define LONGLONG as a structure similar to LARGE_INTEGER
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* and do everything by hand. You are welcome to do it...
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*/
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/******************************************************************************
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* RtlLargeIntegerAdd (NTDLL.@)
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*/
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LONGLONG WINAPI RtlLargeIntegerAdd( LONGLONG a, LONGLONG b )
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{
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return a + b;
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}
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/******************************************************************************
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* RtlLargeIntegerSubtract (NTDLL.@)
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*/
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LONGLONG WINAPI RtlLargeIntegerSubtract( LONGLONG a, LONGLONG b )
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{
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return a - b;
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}
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/******************************************************************************
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* RtlLargeIntegerNegate (NTDLL.@)
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*/
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LONGLONG WINAPI RtlLargeIntegerNegate( LONGLONG a )
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{
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return -a;
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}
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/******************************************************************************
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* RtlLargeIntegerShiftLeft (NTDLL.@)
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*/
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LONGLONG WINAPI RtlLargeIntegerShiftLeft( LONGLONG a, INT count )
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{
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return a << count;
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}
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/******************************************************************************
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* RtlLargeIntegerShiftRight (NTDLL.@)
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*/
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LONGLONG WINAPI RtlLargeIntegerShiftRight( LONGLONG a, INT count )
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{
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return (ULONGLONG)a >> count;
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}
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/******************************************************************************
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* RtlLargeIntegerArithmeticShift (NTDLL.@)
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*/
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LONGLONG WINAPI RtlLargeIntegerArithmeticShift( LONGLONG a, INT count )
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{
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/* FIXME: gcc does arithmetic shift here, but it may not be true on all platforms */
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return a >> count;
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}
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/******************************************************************************
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* RtlLargeIntegerDivide (NTDLL.@)
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*
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* FIXME: should it be signed division instead?
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*/
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ULONGLONG WINAPI RtlLargeIntegerDivide( ULONGLONG a, ULONGLONG b, ULONGLONG *rem )
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{
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ULONGLONG ret = a / b;
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if (rem) *rem = a - ret * b;
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return ret;
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}
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/******************************************************************************
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* RtlConvertLongToLargeInteger (NTDLL.@)
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*/
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LONGLONG WINAPI RtlConvertLongToLargeInteger( LONG a )
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{
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return a;
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}
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/******************************************************************************
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* RtlConvertUlongToLargeInteger (NTDLL.@)
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*/
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ULONGLONG WINAPI RtlConvertUlongToLargeInteger( ULONG a )
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{
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return a;
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}
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/******************************************************************************
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* RtlEnlargedIntegerMultiply (NTDLL.@)
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*/
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LONGLONG WINAPI RtlEnlargedIntegerMultiply( INT a, INT b )
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{
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return (LONGLONG)a * b;
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}
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/******************************************************************************
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* RtlEnlargedUnsignedMultiply (NTDLL.@)
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*/
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ULONGLONG WINAPI RtlEnlargedUnsignedMultiply( UINT a, UINT b )
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{
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return (ULONGLONG)a * b;
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}
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/******************************************************************************
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* RtlEnlargedUnsignedDivide (NTDLL.@)
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*/
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UINT WINAPI RtlEnlargedUnsignedDivide( ULONGLONG a, UINT b, UINT *remptr )
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{
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#if defined(__i386__) && defined(__GNUC__)
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UINT ret, rem, p1, p2;
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p1 = a >> 32;
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p2 = a & 0xffffffffLL;
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__asm__("div %4,%%eax"
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: "=a" (ret), "=d" (rem)
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: "0" (p2), "1" (p1), "g" (b) );
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if (remptr) *remptr = rem;
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return ret;
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#else
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UINT ret = a / b;
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if (remptr) *remptr = a % b;
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return ret;
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#endif
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}
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/******************************************************************************
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* RtlExtendedLargeIntegerDivide (NTDLL.@)
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*/
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LONGLONG WINAPI RtlExtendedLargeIntegerDivide( LONGLONG a, INT b, INT *rem )
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{
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LONGLONG ret = a / b;
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if (rem) *rem = a - b * ret;
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return ret;
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}
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/******************************************************************************
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* RtlExtendedIntegerMultiply (NTDLL.@)
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*/
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LONGLONG WINAPI RtlExtendedIntegerMultiply( LONGLONG a, INT b )
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{
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return a * b;
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}
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/******************************************************************************
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* RtlExtendedMagicDivide (NTDLL.@)
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*
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* Allows replacing a division by a longlong constant with a multiplication by
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* the inverse constant.
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*
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* RETURNS
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* (dividend * inverse_divisor) >> (64 + shift)
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*
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* NOTES
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* If the divisor of a division is constant, the constants inverse_divisor and
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* shift must be chosen such that inverse_divisor = 2^(64 + shift) / divisor.
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* Then we have RtlExtendedMagicDivide(dividend,inverse_divisor,shift) ==
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* dividend * inverse_divisor / 2^(64 + shift) == dividend / divisor.
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*
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* The Parameter inverse_divisor although defined as LONGLONG is used as
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* ULONGLONG.
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*/
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#define LOWER_32(A) ((A) & 0xffffffff)
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#define UPPER_32(A) ((A) >> 32)
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LONGLONG WINAPI RtlExtendedMagicDivide(
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LONGLONG dividend, /* [I] Dividend to be divided by the constant divisor */
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LONGLONG inverse_divisor, /* [I] Constant computed manually as 2^(64+shift) / divisor */
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INT shift) /* [I] Constant shift chosen to make inverse_divisor as big as possible for 64 bits */
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{
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ULONGLONG dividend_high;
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ULONGLONG dividend_low;
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ULONGLONG inverse_divisor_high;
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ULONGLONG inverse_divisor_low;
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ULONGLONG ah_bl;
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ULONGLONG al_bh;
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LONGLONG result;
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int positive;
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if (dividend < 0) {
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dividend_high = UPPER_32((ULONGLONG) -dividend);
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dividend_low = LOWER_32((ULONGLONG) -dividend);
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positive = 0;
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} else {
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dividend_high = UPPER_32((ULONGLONG) dividend);
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dividend_low = LOWER_32((ULONGLONG) dividend);
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positive = 1;
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} /* if */
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inverse_divisor_high = UPPER_32((ULONGLONG) inverse_divisor);
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inverse_divisor_low = LOWER_32((ULONGLONG) inverse_divisor);
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ah_bl = dividend_high * inverse_divisor_low;
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al_bh = dividend_low * inverse_divisor_high;
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result = (LONGLONG) ((dividend_high * inverse_divisor_high +
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UPPER_32(ah_bl) +
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UPPER_32(al_bh) +
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UPPER_32(LOWER_32(ah_bl) + LOWER_32(al_bh) +
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UPPER_32(dividend_low * inverse_divisor_low))) >> shift);
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if (positive) {
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return result;
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} else {
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return -result;
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} /* if */
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}
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/******************************************************************************
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* RtlLargeIntegerToChar [NTDLL.@]
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*
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* Convert an unsigned large integer to a character string.
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*
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* RETURNS
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* Success: STATUS_SUCCESS. str contains the converted number
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* Failure: STATUS_INVALID_PARAMETER, if base is not 0, 2, 8, 10 or 16.
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* STATUS_BUFFER_OVERFLOW, if str would be larger than length.
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* STATUS_ACCESS_VIOLATION, if str is NULL.
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*
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* NOTES
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* Instead of base 0 it uses 10 as base.
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* Writes at most length characters to the string str.
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* Str is '\0' terminated when length allowes it.
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* When str fits exactly in length characters the '\0' is ommitted.
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* If value_ptr is NULL it crashes, as the native function does.
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*
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* DIFFERENCES
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* - Accept base 0 as 10 instead of crashing as native function does.
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* - The native function does produce garbage or STATUS_BUFFER_OVERFLOW for
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* base 2, 8 and 16 when the value is larger than 0xFFFFFFFF.
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*/
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NTSTATUS WINAPI RtlLargeIntegerToChar(
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const ULONGLONG *value_ptr, /* [I] Pointer to the value to be converted */
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ULONG base, /* [I] Number base for conversion (allowed 0, 2, 8, 10 or 16) */
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ULONG length, /* [I] Length of the str buffer in bytes */
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PCHAR str) /* [O] Destination for the converted value */
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{
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ULONGLONG value = *value_ptr;
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CHAR buffer[65];
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PCHAR pos;
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CHAR digit;
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ULONG len;
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if (base == 0) {
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base = 10;
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} else if (base != 2 && base != 8 && base != 10 && base != 16) {
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return STATUS_INVALID_PARAMETER;
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} /* if */
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pos = &buffer[64];
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*pos = '\0';
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do {
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pos--;
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digit = value % base;
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value = value / base;
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if (digit < 10) {
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*pos = '0' + digit;
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} else {
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*pos = 'A' + digit - 10;
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} /* if */
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} while (value != 0L);
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len = &buffer[64] - pos;
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if (len > length) {
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return STATUS_BUFFER_OVERFLOW;
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} else if (str == NULL) {
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return STATUS_ACCESS_VIOLATION;
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} else if (len == length) {
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memcpy(str, pos, len);
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} else {
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memcpy(str, pos, len + 1);
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} /* if */
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return STATUS_SUCCESS;
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}
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/**************************************************************************
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* RtlInt64ToUnicodeString (NTDLL.@)
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*
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* Convert a large unsigned integer to a '\0' terminated unicode string.
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*
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* RETURNS
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* Success: STATUS_SUCCESS. str contains the converted number
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* Failure: STATUS_INVALID_PARAMETER, if base is not 0, 2, 8, 10 or 16.
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* STATUS_BUFFER_OVERFLOW, if str is too small to hold the string
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* (with the '\0' termination). In this case str->Length
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* is set to the length, the string would have (which can
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* be larger than the MaximumLength).
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*
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* NOTES
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* Instead of base 0 it uses 10 as base.
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* If str is NULL it crashes, as the native function does.
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*
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* DIFFERENCES
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* - Accept base 0 as 10 instead of crashing as native function does.
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* - Do not return STATUS_BUFFER_OVERFLOW when the string is long enough.
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* The native function does this when the string would be longer than 31
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* characters even when the string parameter is long enough.
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* - The native function does produce garbage or STATUS_BUFFER_OVERFLOW for
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* base 2, 8 and 16 when the value is larger than 0xFFFFFFFF.
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*/
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NTSTATUS WINAPI RtlInt64ToUnicodeString(
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ULONGLONG value, /* [I] Value to be converted */
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ULONG base, /* [I] Number base for conversion (allowed 0, 2, 8, 10 or 16) */
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UNICODE_STRING *str) /* [O] Destination for the converted value */
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{
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WCHAR buffer[65];
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PWCHAR pos;
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WCHAR digit;
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if (base == 0) {
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base = 10;
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} else if (base != 2 && base != 8 && base != 10 && base != 16) {
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return STATUS_INVALID_PARAMETER;
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} /* if */
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pos = &buffer[64];
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*pos = '\0';
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do {
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pos--;
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digit = value % base;
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value = value / base;
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if (digit < 10) {
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*pos = '0' + digit;
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} else {
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*pos = 'A' + digit - 10;
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} /* if */
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} while (value != 0L);
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str->Length = (&buffer[64] - pos) * sizeof(WCHAR);
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if (str->Length >= str->MaximumLength) {
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return STATUS_BUFFER_OVERFLOW;
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} else {
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memcpy(str->Buffer, pos, str->Length + sizeof(WCHAR));
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} /* if */
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return STATUS_SUCCESS;
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}
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/******************************************************************************
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* _alldiv (NTDLL.@)
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*/
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LONGLONG WINAPI _alldiv( LONGLONG a, LONGLONG b )
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{
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return a / b;
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}
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/******************************************************************************
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* _allmul (NTDLL.@)
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*/
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LONGLONG WINAPI _allmul( LONGLONG a, LONGLONG b )
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{
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return a * b;
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}
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/******************************************************************************
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* _allrem (NTDLL.@)
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*/
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LONGLONG WINAPI _allrem( LONGLONG a, LONGLONG b )
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{
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return a % b;
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}
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/******************************************************************************
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* _aulldiv (NTDLL.@)
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*/
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ULONGLONG WINAPI _aulldiv( ULONGLONG a, ULONGLONG b )
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{
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return a / b;
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}
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/******************************************************************************
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* _aullrem (NTDLL.@)
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*/
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ULONGLONG WINAPI _aullrem( ULONGLONG a, ULONGLONG b )
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{
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return a % b;
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}
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