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Speed up nsCRT::HashCode(const PRUnichar*) by renaming the version that does UCS-2 to UTF-8 conversion to nsCRT::HashCodeAsUTF8. r=jag sr=jst b=120363

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This commit is contained in:
dbaron%fas.harvard.edu 2002-02-16 19:50:32 +00:00
parent 645e00764a
commit 030f6a08b1
2 changed files with 28 additions and 4 deletions
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14
xpcom/ds/nsCRT.cpp
View File

@ -291,6 +291,20 @@ PRUint32 nsCRT::HashCode(const PRUnichar* str, PRUint32* resultingStrLen)
if (!str) return h;
PRUnichar c;
while ( (c = *s++) )
h = (h>>28) ^ (h<<4) ^ c;
if ( resultingStrLen )
*resultingStrLen = (s-str)-1;
return h;
}
PRUint32 nsCRT::HashCodeAsUTF8(const PRUnichar* str, PRUint32* resultingStrLen)
{
PRUint32 h = 0;
const PRUnichar* s = str;
{
PRUint16 W1 = 0; // the first UTF-16 word in a two word tuple
PRUint32 U = 0; // the current char as UCS-4

18
xpcom/ds/nsCRT.h
View File

@ -232,11 +232,21 @@ public:
shared_allocator.deallocate(str, 0 /*we never new or kept the size*/);
}
// Computes the hashcode for a c-string, returns the string length as an added bonus.
static PRUint32 HashCode(const char* str, PRUint32* resultingStrLen = nsnull);
// Computes the hashcode for a c-string, returns the string length as
// an added bonus.
static PRUint32 HashCode(const char* str,
PRUint32* resultingStrLen = nsnull);
// Computes the hashcode for a ucs2 string, returns the string length as an added bonus.
static PRUint32 HashCode(const PRUnichar* str, PRUint32* resultingStrLen = nsnull);
// Computes the hashcode for a ucs2 string, returns the string length
// as an added bonus.
static PRUint32 HashCode(const PRUnichar* str,
PRUint32* resultingStrLen = nsnull);
// Computes a hashcode for a ucs2 string that returns the same thing
// as the HashCode method taking a |char*| would if the string were
// converted to UTF8. Returns the string length as an added bonus.
static PRUint32 HashCodeAsUTF8(const PRUnichar* str,
PRUint32* resultingStrLen = nsnull);
// Computes the hashcode for a buffer with a specified length.
static PRUint32 BufferHashCode(const char* str, PRUint32 strLen);