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HashFunc.cpp
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65 lines (57 loc) · 2.05 KB
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//-------------------------------------------------------------------------------------------------------
// Copyright (C) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
//-------------------------------------------------------------------------------------------------------
/*
* IMPORTANT:
* This file does not compile stand alone. It was required so that
* the same code could be built into a utility program comphash.exe as well
* as the scripting dll's. This file is included in core\comphash.cpp
* to be used by comphash.exe. It is included in core\scrutil.cpp where to
* be used by jscript.dll and vbscript.dll.
*
* comphash.exe is a utility used in the build to generate a source code file
* containing a table of hash values associated with strings needed by
* jscript and vbscript. It is highly desirable to have a single definition
* of the hash function so things don't go out of sync.
*/
ULONG CaseSensitiveComputeHashCch(LPCOLESTR prgch, int32 cch)
{
ULONG luHash = 0;
while (cch-- > 0)
luHash = 17 * luHash + *(char16 *)prgch++;
return luHash;
}
ULONG CaseSensitiveComputeHashCch(LPCUTF8 prgch, int32 cch)
{
utf8::DecodeOptions options = utf8::doAllowThreeByteSurrogates;
ULONG luHash = 0;
while (cch-- > 0)
{
LPCUTF8 end = prgch + cch + 1; // WARNING: Assume cch correct, suppress end-of-buffer checking
luHash = 17 * luHash + utf8::Decode(prgch, end, options);
}
return luHash;
}
ULONG CaseSensitiveComputeHashCch(char const * prgch, int32 cch)
{
ULONG luHash = 0;
while (cch-- > 0)
{
Assert(utf8::IsStartByte(*prgch) && !utf8::IsLeadByte(*prgch));
luHash = 17 * luHash + *prgch++;
}
return luHash;
}
ULONG CaseInsensitiveComputeHash(LPCOLESTR posz)
{
ULONG luHash = 0;
char16 ch;
while (0 != (ch = *(char16 *)posz++))
{
if (ch <= 'Z' && ch >= 'A')
ch += 'a' - 'A';
luHash = 17 * luHash + ch;
}
return luHash;
}