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6da4c275ca
wine/dlls/ntdll/rtl.c
Alexandre Julliard 6da4c275ca Implemented Rtl*ByteSwap() functions, based on a patch by Jon 
Griffiths.
2003-03-19 00:09:57 +00:00

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/*
* NT basis DLL
*
* This file contains the Rtl* API functions. These should be implementable.
*
* Copyright 1996-1998 Marcus Meissner
* 1999 Alex Korobka
* Crc32 code Copyright 1986 Gary S. Brown (Public domain)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include "wine/port.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "windef.h"
#include "winerror.h"
#include "winternl.h"
#include "winreg.h"
#include "wine/unicode.h"
#include "wine/debug.h"
#include "ntdll_misc.h"
WINE_DEFAULT_DEBUG_CHANNEL(ntdll);
static RTL_CRITICAL_SECTION peb_lock = CRITICAL_SECTION_INIT("peb_lock");
/* CRC polynomial 0xedb88320 */
static const DWORD CRC_table[256] =
{
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
};
/*
* resource functions
*/
/***********************************************************************
* RtlInitializeResource (NTDLL.@)
*
* xxxResource() functions implement multiple-reader-single-writer lock.
* The code is based on information published in WDJ January 1999 issue.
*/
void WINAPI RtlInitializeResource(LPRTL_RWLOCK rwl)
{
if( rwl )
{
rwl->iNumberActive = 0;
rwl->uExclusiveWaiters = 0;
rwl->uSharedWaiters = 0;
rwl->hOwningThreadId = 0;
rwl->dwTimeoutBoost = 0; /* no info on this one, default value is 0 */
RtlInitializeCriticalSection( &rwl->rtlCS );
NtCreateSemaphore( &rwl->hExclusiveReleaseSemaphore, 0, NULL, 0, 65535 );
NtCreateSemaphore( &rwl->hSharedReleaseSemaphore, 0, NULL, 0, 65535 );
}
}
/***********************************************************************
* RtlDeleteResource (NTDLL.@)
*/
void WINAPI RtlDeleteResource(LPRTL_RWLOCK rwl)
{
if( rwl )
{
RtlEnterCriticalSection( &rwl->rtlCS );
if( rwl->iNumberActive || rwl->uExclusiveWaiters || rwl->uSharedWaiters )
MESSAGE("Deleting active MRSW lock (%p), expect failure\n", rwl );
rwl->hOwningThreadId = 0;
rwl->uExclusiveWaiters = rwl->uSharedWaiters = 0;
rwl->iNumberActive = 0;
NtClose( rwl->hExclusiveReleaseSemaphore );
NtClose( rwl->hSharedReleaseSemaphore );
RtlLeaveCriticalSection( &rwl->rtlCS );
RtlDeleteCriticalSection( &rwl->rtlCS );
}
}
/***********************************************************************
* RtlAcquireResourceExclusive (NTDLL.@)
*/
BYTE WINAPI RtlAcquireResourceExclusive(LPRTL_RWLOCK rwl, BYTE fWait)
{
BYTE retVal = 0;
if( !rwl ) return 0;
start:
RtlEnterCriticalSection( &rwl->rtlCS );
if( rwl->iNumberActive == 0 ) /* lock is free */
{
rwl->iNumberActive = -1;
retVal = 1;
}
else if( rwl->iNumberActive < 0 ) /* exclusive lock in progress */
{
if( rwl->hOwningThreadId == (HANDLE)GetCurrentThreadId() )
{
retVal = 1;
rwl->iNumberActive--;
goto done;
}
wait:
if( fWait )
{
rwl->uExclusiveWaiters++;
RtlLeaveCriticalSection( &rwl->rtlCS );
if( WaitForSingleObject( rwl->hExclusiveReleaseSemaphore, INFINITE ) == WAIT_FAILED )
goto done;
goto start; /* restart the acquisition to avoid deadlocks */
}
}
else /* one or more shared locks are in progress */
if( fWait )
goto wait;
if( retVal == 1 )
rwl->hOwningThreadId = (HANDLE)GetCurrentThreadId();
done:
RtlLeaveCriticalSection( &rwl->rtlCS );
return retVal;
}
/***********************************************************************
* RtlAcquireResourceShared (NTDLL.@)
*/
BYTE WINAPI RtlAcquireResourceShared(LPRTL_RWLOCK rwl, BYTE fWait)
{
DWORD dwWait = WAIT_FAILED;
BYTE retVal = 0;
if( !rwl ) return 0;
start:
RtlEnterCriticalSection( &rwl->rtlCS );
if( rwl->iNumberActive < 0 )
{
if( rwl->hOwningThreadId == (HANDLE)GetCurrentThreadId() )
{
rwl->iNumberActive--;
retVal = 1;
goto done;
}
if( fWait )
{
rwl->uSharedWaiters++;
RtlLeaveCriticalSection( &rwl->rtlCS );
if( (dwWait = WaitForSingleObject( rwl->hSharedReleaseSemaphore, INFINITE )) == WAIT_FAILED )
goto done;
goto start;
}
}
else
{
if( dwWait != WAIT_OBJECT_0 ) /* otherwise RtlReleaseResource() has already done it */
rwl->iNumberActive++;
retVal = 1;
}
done:
RtlLeaveCriticalSection( &rwl->rtlCS );
return retVal;
}
/***********************************************************************
* RtlReleaseResource (NTDLL.@)
*/
void WINAPI RtlReleaseResource(LPRTL_RWLOCK rwl)
{
RtlEnterCriticalSection( &rwl->rtlCS );
if( rwl->iNumberActive > 0 ) /* have one or more readers */
{
if( --rwl->iNumberActive == 0 )
{
if( rwl->uExclusiveWaiters )
{
wake_exclusive:
rwl->uExclusiveWaiters--;
NtReleaseSemaphore( rwl->hExclusiveReleaseSemaphore, 1, NULL );
}
}
}
else
if( rwl->iNumberActive < 0 ) /* have a writer, possibly recursive */
{
if( ++rwl->iNumberActive == 0 )
{
rwl->hOwningThreadId = 0;
if( rwl->uExclusiveWaiters )
goto wake_exclusive;
else
if( rwl->uSharedWaiters )
{
UINT n = rwl->uSharedWaiters;
rwl->iNumberActive = rwl->uSharedWaiters; /* prevent new writers from joining until
* all queued readers have done their thing */
rwl->uSharedWaiters = 0;
NtReleaseSemaphore( rwl->hSharedReleaseSemaphore, n, NULL );
}
}
}
RtlLeaveCriticalSection( &rwl->rtlCS );
}
/***********************************************************************
* RtlDumpResource (NTDLL.@)
*/
void WINAPI RtlDumpResource(LPRTL_RWLOCK rwl)
{
if( rwl )
{
MESSAGE("RtlDumpResource(%p):\n\tactive count = %i\n\twaiting readers = %i\n\twaiting writers = %i\n",
rwl, rwl->iNumberActive, rwl->uSharedWaiters, rwl->uExclusiveWaiters );
if( rwl->iNumberActive )
MESSAGE("\towner thread = %p\n", rwl->hOwningThreadId );
}
}
/*
* misc functions
*/
/******************************************************************************
* DbgPrint [NTDLL.@]
*/
void WINAPIV DbgPrint(LPCSTR fmt, ...)
{
char buf[512];
va_list args;
va_start(args, fmt);
vsprintf(buf,fmt, args);
va_end(args);
MESSAGE("DbgPrint says: %s",buf);
/* hmm, raise exception? */
}
/******************************************************************************
* RtlAcquirePebLock [NTDLL.@]
*/
VOID WINAPI RtlAcquirePebLock(void)
{
RtlEnterCriticalSection( &peb_lock );
}
/******************************************************************************
* RtlReleasePebLock [NTDLL.@]
*/
VOID WINAPI RtlReleasePebLock(void)
{
RtlLeaveCriticalSection( &peb_lock );
}
/******************************************************************************
* RtlSetEnvironmentVariable [NTDLL.@]
*/
DWORD WINAPI RtlSetEnvironmentVariable(DWORD x1,PUNICODE_STRING key,PUNICODE_STRING val) {
FIXME("(0x%08lx,%s,%s),stub!\n",x1,debugstr_w(key->Buffer),debugstr_w(val->Buffer));
return 0;
}
/******************************************************************************
* RtlNewSecurityObject [NTDLL.@]
*/
DWORD WINAPI RtlNewSecurityObject(DWORD x1,DWORD x2,DWORD x3,DWORD x4,DWORD x5,DWORD x6) {
FIXME("(0x%08lx,0x%08lx,0x%08lx,0x%08lx,0x%08lx,0x%08lx),stub!\n",x1,x2,x3,x4,x5,x6);
return 0;
}
/******************************************************************************
* RtlDeleteSecurityObject [NTDLL.@]
*/
DWORD WINAPI RtlDeleteSecurityObject(DWORD x1) {
FIXME("(0x%08lx),stub!\n",x1);
return 0;
}
/**************************************************************************
* RtlNormalizeProcessParams [NTDLL.@]
*/
LPVOID WINAPI RtlNormalizeProcessParams(LPVOID x)
{
FIXME("(%p), stub\n",x);
return x;
}
/**************************************************************************
* RtlGetNtProductType [NTDLL.@]
*/
BOOLEAN WINAPI RtlGetNtProductType(LPDWORD type)
{
FIXME("(%p): stub\n", type);
*type=3; /* dunno. 1 for client, 3 for server? */
return 1;
}
/**************************************************************************
* _chkstk [NTDLL.@]
*
* Glorified "enter xxxx".
*/
void WINAPI NTDLL_chkstk( CONTEXT86 *context )
{
context->Esp -= context->Eax;
}
/**************************************************************************
* _alloca_probe [NTDLL.@]
*
* Glorified "enter xxxx".
*/
void WINAPI NTDLL_alloca_probe( CONTEXT86 *context )
{
context->Esp -= context->Eax;
}
/**************************************************************************
* RtlDosPathNameToNtPathName_U [NTDLL.@]
*
* szwDosPath: a fully qualified DOS path name
* ntpath: pointer to a UNICODE_STRING to hold the converted
* path name
*
* FIXME: Should we not allocate the ntpath buffer under some
* circumstances?
* Are the conversions static? (always prepend '\??\' ?)
* Not really sure about the last two arguments.
*/
BOOLEAN WINAPI RtlDosPathNameToNtPathName_U(
LPWSTR szwDosPath,PUNICODE_STRING ntpath,
DWORD x2,DWORD x3)
{
ULONG length;
UNICODE_STRING pathprefix;
WCHAR szPrefix[] = { '\\', '?', '?', '\\', 0 };
FIXME("(%s,%p,%08lx,%08lx) partial stub\n",
debugstr_w(szwDosPath),ntpath,x2,x3);
if ( !szwDosPath )
return FALSE;
if ( !szwDosPath[0] )
return FALSE;
if ( szwDosPath[1]!= ':' )
return FALSE;
length = strlenW(szwDosPath) * sizeof (WCHAR) + sizeof szPrefix;
ntpath->Buffer = RtlAllocateHeap(ntdll_get_process_heap(), 0, length);
ntpath->Length = 0;
ntpath->MaximumLength = length;
if ( !ntpath->Buffer )
return FALSE;
RtlInitUnicodeString( &pathprefix, szPrefix );
RtlCopyUnicodeString( ntpath, &pathprefix );
RtlAppendUnicodeToString( ntpath, szwDosPath );
return TRUE;
}
/******************************************************************************
* RtlCreateEnvironment [NTDLL.@]
*/
DWORD WINAPI RtlCreateEnvironment(DWORD x1,DWORD x2) {
FIXME("(0x%08lx,0x%08lx),stub!\n",x1,x2);
return 0;
}
/******************************************************************************
* RtlDestroyEnvironment [NTDLL.@]
*/
DWORD WINAPI RtlDestroyEnvironment(DWORD x) {
FIXME("(0x%08lx),stub!\n",x);
return 0;
}
/******************************************************************************
* RtlQueryEnvironmentVariable_U [NTDLL.@]
*/
DWORD WINAPI RtlQueryEnvironmentVariable_U(DWORD x1,PUNICODE_STRING key,PUNICODE_STRING val) {
FIXME("(0x%08lx,%s,%p),stub!\n",x1,debugstr_w(key->Buffer),val);
return 0;
}
/******************************************************************************
* RtlInitializeGenericTable [NTDLL.@]
*/
PVOID WINAPI RtlInitializeGenericTable(PVOID pTable, PVOID arg2, PVOID arg3, PVOID arg4, PVOID arg5)
{
FIXME("(%p,%p,%p,%p,%p) stub!\n", pTable, arg2, arg3, arg4, arg5);
return NULL;
}
/******************************************************************************
* RtlMoveMemory [NTDLL.@]
*
* Move a block of memory that may overlap.
*
* PARAMS
* Destination [O] End destination for block
* Source [O] Where to start copying from
* Length [I] Number of bytes to copy
*
* RETURNS
* Nothing.
*/
#undef RtlMoveMemory
VOID WINAPI RtlMoveMemory( VOID *Destination, CONST VOID *Source, SIZE_T Length )
{
memmove(Destination, Source, Length);
}
/******************************************************************************
* RtlFillMemory [NTDLL.@]
*
* Set a block of memory with a value.
*
* PARAMS
* Destination [O] Block to fill
* Length [I] Number of bytes to fill
* Fill [I] Value to set
*
* RETURNS
* Nothing.
*/
#undef RtlFillMemory
VOID WINAPI RtlFillMemory( VOID *Destination, SIZE_T Length, BYTE Fill )
{
memset(Destination, Fill, Length);
}
/******************************************************************************
* RtlZeroMemory [NTDLL.@]
*
* Set a block of memory with 0's.
*
* PARAMS
* Destination [O] Block to fill
* Length [I] Number of bytes to fill
*
* RETURNS
* Nothing.
*/
#undef RtlZeroMemory
VOID WINAPI RtlZeroMemory( VOID *Destination, SIZE_T Length )
{
memset(Destination, 0, Length);
}
/******************************************************************************
* RtlCompareMemory [NTDLL.@]
*
* Compare one block of memory with another
*
* PARAMS
* Source1 [I] Source block
* Source2 [I] Block to compare to Source1
* Length [I] Number of bytes to fill
*
* RETURNS
* The length of the first byte at which Source1 and Source2 differ, or Length
* if they are the same.
*/
SIZE_T WINAPI RtlCompareMemory( const VOID *Source1, const VOID *Source2, SIZE_T Length)
{
SIZE_T i;
for(i=0; (i<Length) && (((LPBYTE)Source1)[i]==((LPBYTE)Source2)[i]); i++);
return i;
}
/******************************************************************************
* RtlCompareMemoryUlong [NTDLL.@]
*
* Compare a block of memory with a value, a ULONG at a time
*
* PARAMS
* Source1 [I] Source block. This must be ULONG aligned
* Length [I] Number of bytes to compare. This should be a multiple of 4
* dwVal [I] Value to compare to
*
* RETURNS
* The byte position of the first byte at which Source1 is not dwVal.
*/
SIZE_T WINAPI RtlCompareMemoryUlong(const ULONG *Source1, SIZE_T Length, ULONG dwVal)
{
SIZE_T i;
for(i = 0; i < Length/sizeof(ULONG) && Source1[i] == dwVal; i++);
return i * sizeof(ULONG);
}
/******************************************************************************
* RtlAssert [NTDLL.@]
*
* Fail a debug assertion.
*
* RETURNS
* Nothing. This call does not return control to its caller.
*
* NOTES
* Not implemented in non-debug versions.
*/
void WINAPI RtlAssert(LPVOID x1,LPVOID x2,DWORD x3, DWORD x4)
{
FIXME("(%p,%p,0x%08lx,0x%08lx),stub\n",x1,x2,x3,x4);
}
/******************************************************************************
* RtlGetNtVersionNumbers [NTDLL.@]
*
* Get the version numbers of the run time library.
*
* PARAMS
* major [O] Destination for the Major version
* minor [O] Destination for the Minor version
* build [O] Destination for the Build version
*
* RETURNS
* Nothing.
*
* NOTES
* Introduced in Windows XP (NT5.1)
*/
void WINAPI RtlGetNtVersionNumbers(LPDWORD major, LPDWORD minor, LPDWORD build)
{
OSVERSIONINFOEXW versionInfo;
versionInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEXW);
GetVersionExW((OSVERSIONINFOW*)&versionInfo);
if (major)
{
/* msvcrt.dll as released with XP Home fails in DLLMain() if the
* major version is not 5. So, we should never set a version < 5 ...
* This makes sense since this call didn't exist before XP anyway.
*/
*major = versionInfo.dwMajorVersion < 5 ? 5 : versionInfo.dwMajorVersion;
}
if (minor)
{
*minor = versionInfo.dwMinorVersion;
}
if (build)
{
/* FIXME: Does anybody know the real formula? */
*build = (0xF0000000 | versionInfo.dwBuildNumber);
}
}
/*************************************************************************
* RtlFillMemoryUlong [NTDLL.@]
*
* Fill memory with a 32 bit (dword) value.
*
* PARAMS
* lpDest [I] Bitmap pointer
* ulCount [I] Number of dwords to write
* ulValue [I] Value to fill with
*
* RETURNS
* Nothing.
*/
VOID WINAPI RtlFillMemoryUlong(ULONG* lpDest, ULONG ulCount, ULONG ulValue)
{
TRACE("(%p,%ld,%ld)\n", lpDest, ulCount, ulValue);
ulCount /= sizeof(ULONG);
while(ulCount--)
*lpDest++ = ulValue;
}
/*************************************************************************
* RtlGetLongestNtPathLength [NTDLL.@]
*
* Get the longest allowed path length
*
* PARAMS
* None.
*
* RETURNS
* The longest allowed path length (277 characters under Win2k).
*/
DWORD WINAPI RtlGetLongestNtPathLength(void)
{
TRACE("()\n");
return 277;
}
/*********************************************************************
* RtlComputeCrc32 [NTDLL.@]
*
* Calculate the CRC32 checksum of a block of bytes
*
* PARAMS
* dwInitial [I] Initial CRC value
* pData [I] Data block
* iLen [I] Length of the byte block
*
* RETURNS
* The cumulative CRC32 of dwInitial and iLen bytes of the pData block.
*/
DWORD WINAPI RtlComputeCrc32(DWORD dwInitial, PBYTE pData, INT iLen)
{
DWORD crc = ~dwInitial;
TRACE("(%ld,%p,%d)\n", dwInitial, pData, iLen);
while (iLen > 0)
{
crc = CRC_table[(crc ^ *pData) & 0xff] ^ (crc >> 8);
pData++;
iLen--;
}
return ~crc;
}
/*************************************************************************
* RtlUlonglongByteSwap [NTDLL.@]
*
* Swap the bytes of an unsigned long long value.
*
* PARAMS
* i [I] Value to swap bytes of
*
* RETURNS
* The value with its bytes swapped.
*/
ULONGLONG __cdecl RtlUlonglongByteSwap(ULONGLONG i)
{
return ((ULONGLONG)RtlUlongByteSwap(i) << 32) | RtlUlongByteSwap(i>>32);
}
/*************************************************************************
* RtlUlongByteSwap [NTDLL.@]
*
* Swap the bytes of an unsigned int value.
*
* NOTES
* ix86 version takes argument in %ecx. Other systems use the inline version.
*/
#ifdef __i386__
__ASM_GLOBAL_FUNC(RtlUlongByteSwap,
"movl %ecx,%eax\n\t"
"bswap %eax\n\t"
"ret");
#endif
/*************************************************************************
* RtlUshortByteSwap [NTDLL.@]
*
* Swap the bytes of an unsigned short value.
*
* NOTES
* i386 version takes argument in %cx. Other systems use the inline version.
*/
#ifdef __i386__
__ASM_GLOBAL_FUNC(RtlUshortByteSwap,
"movb %ch,%al\n\t"
"movb %cl,%ah\n\t"
"ret");
#endif
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