private unsafe static int FindStringOrdinal(char *source, int sourceCount, char *value,int valueCount, FindStringOptions option, bool ignoreCase)
{
int ctrSource = 0; // index value into source
int ctrValue = 0; // index value into value
char sourceChar; // Character for case lookup in source
char valueChar; // Character for case lookup in value
int lastSourceStart;
Contract.Assert(source != null);
Contract.Assert(value != null);
Contract.Assert(sourceCount>= 0);
Contract.Assert(valueCount >= 0);
if(valueCount == 0)
{
switch (option)
{
case FindStringOptions.StartsWith:
case FindStringOptions.Start:
return(0);
case FindStringOptions.EndsWith:
case FindStringOptions.End:
return(sourceCount);
default:
return -1;
}
}
if(sourceCount < valueCount)
{
return -1;
}
switch (option)
{
case FindStringOptions.StartsWith:
{
if (ignoreCase)
{
for (ctrValue = 0; ctrValue < valueCount; ctrValue++)
{
sourceChar = ToUpper(source[ctrValue]);
valueChar = ToUpper(value[ctrValue]);
if (sourceChar != valueChar)
{
break;
}
}
}
else
{
for (ctrValue = 0; ctrValue < valueCount; ctrValue++)
{
sourceChar = source[ctrValue];
valueChar = value[ctrValue];
if (sourceChar != valueChar)
{
break;
}
}
}
if (ctrValue == valueCount)
{
return 0;
}
}
break;
case FindStringOptions.Start:
{
lastSourceStart = sourceCount - valueCount;
if (ignoreCase)
{
char firstValueChar = ToUpper(value[0]);
for (ctrSource = 0; ctrSource <= lastSourceStart; ctrSource++)
{
sourceChar = ToUpper(source[ctrSource]);
if (sourceChar != firstValueChar)
{
continue;
}
for (ctrValue = 1; ctrValue < valueCount; ctrValue++)
{
sourceChar = ToUpper(source[ctrSource + ctrValue]);
valueChar = ToUpper(value[ctrValue]);
if (sourceChar != valueChar)
{
break;
}
}
if (ctrValue == valueCount)
{
return ctrSource;
}
}
}
else
{
char firstValueChar = value[0];
for (ctrSource = 0; ctrSource <= lastSourceStart; ctrSource++)
{
sourceChar = source[ctrSource];
if (sourceChar != firstValueChar)
{
continue;
}
for (ctrValue = 1; ctrValue < valueCount; ctrValue++)
{
sourceChar = source[ctrSource + ctrValue];
valueChar = value[ctrValue];
if (sourceChar != valueChar)
{
break;
}
}
if (ctrValue == valueCount)
{
return ctrSource;
}
}
}
}
break;
case FindStringOptions.EndsWith:
{
lastSourceStart = sourceCount - valueCount;
if (ignoreCase)
{
for (ctrSource = lastSourceStart, ctrValue = 0; ctrValue < valueCount; ctrSource++,ctrValue++)
{
sourceChar = ToUpper(source[ctrSource]);
valueChar = ToUpper(value[ctrValue]);
if (sourceChar != valueChar)
{
break;
}
}
}
else
{
for (ctrSource = lastSourceStart, ctrValue = 0; ctrValue < valueCount; ctrSource++,ctrValue++)
{
sourceChar = source[ctrSource];
valueChar = value[ctrValue];
if (sourceChar != valueChar)
{
break;
}
}
}
if (ctrValue == valueCount)
{
return sourceCount - valueCount;
}
}
break;
case FindStringOptions.End:
{
lastSourceStart = sourceCount - valueCount;
if (ignoreCase)
{
char firstValueChar = ToUpper(value[0]);
for (ctrSource = lastSourceStart; ctrSource >= 0; ctrSource--)
{
sourceChar = ToUpper(source[ctrSource]);
if(sourceChar != firstValueChar)
{
continue;
}
for (ctrValue = 1; ctrValue < valueCount; ctrValue++)
{
sourceChar = ToUpper(source[ctrSource + ctrValue]);
valueChar = ToUpper(value[ctrValue]);
if (sourceChar != valueChar)
{
break;
}
}
if (ctrValue == valueCount)
{
return ctrSource;
}
}
} else {
char firstValueChar = value[0];
for (ctrSource = lastSourceStart; ctrSource >= 0; ctrSource--)
{
sourceChar = source[ctrSource];
if(sourceChar != firstValueChar)
{
continue;
}
for (ctrValue = 1; ctrValue < valueCount; ctrValue++)
{
sourceChar = source[ctrSource + ctrValue];
valueChar = value[ctrValue];
if (sourceChar != valueChar)
{
break;
}
}
if (ctrValue == valueCount)
{
return ctrSource;
}
}
}
}
break;
default:
return -1;
}
return -1;
}
private unsafe static int FindStringOrdinal(char *source, int sourceCount, char *value, int valueCount, FindStringOptions option, bool ignoreCase)
{
int ctrSource = 0; // index value into source
int ctrValue = 0; // index value into value
char sourceChar; // Character for case lookup in source
char valueChar; // Character for case lookup in value
int lastSourceStart;
Debug.Assert(source != null);
Debug.Assert(value != null);
Debug.Assert(sourceCount >= 0);
Debug.Assert(valueCount >= 0);
if (valueCount == 0)
{
switch (option)
{
case FindStringOptions.StartsWith:
case FindStringOptions.Start:
return(0);
case FindStringOptions.EndsWith:
case FindStringOptions.End:
return(sourceCount);
default:
return(-1);
}
}
if (sourceCount < valueCount)
{
return(-1);
}
switch (option)
{
case FindStringOptions.StartsWith:
{
if (ignoreCase)
{
for (ctrValue = 0; ctrValue < valueCount; ctrValue++)
{
sourceChar = ToUpper(source[ctrValue]);
valueChar = ToUpper(value[ctrValue]);
if (sourceChar != valueChar)
{
break;
}
}
}
else
{
for (ctrValue = 0; ctrValue < valueCount; ctrValue++)
{
sourceChar = source[ctrValue];
valueChar = value[ctrValue];
if (sourceChar != valueChar)
{
break;
}
}
}
if (ctrValue == valueCount)
{
return(0);
}
}
break;
case FindStringOptions.Start:
{
lastSourceStart = sourceCount - valueCount;
if (ignoreCase)
{
char firstValueChar = ToUpper(value[0]);
for (ctrSource = 0; ctrSource <= lastSourceStart; ctrSource++)
{
sourceChar = ToUpper(source[ctrSource]);
if (sourceChar != firstValueChar)
{
continue;
}
for (ctrValue = 1; ctrValue < valueCount; ctrValue++)
{
sourceChar = ToUpper(source[ctrSource + ctrValue]);
valueChar = ToUpper(value[ctrValue]);
if (sourceChar != valueChar)
{
break;
}
}
if (ctrValue == valueCount)
{
return(ctrSource);
}
}
}
else
{
char firstValueChar = value[0];
for (ctrSource = 0; ctrSource <= lastSourceStart; ctrSource++)
{
sourceChar = source[ctrSource];
if (sourceChar != firstValueChar)
{
continue;
}
for (ctrValue = 1; ctrValue < valueCount; ctrValue++)
{
sourceChar = source[ctrSource + ctrValue];
valueChar = value[ctrValue];
if (sourceChar != valueChar)
{
break;
}
}
if (ctrValue == valueCount)
{
return(ctrSource);
}
}
}
}
break;
case FindStringOptions.EndsWith:
{
lastSourceStart = sourceCount - valueCount;
if (ignoreCase)
{
for (ctrSource = lastSourceStart, ctrValue = 0; ctrValue < valueCount; ctrSource++, ctrValue++)
{
sourceChar = ToUpper(source[ctrSource]);
valueChar = ToUpper(value[ctrValue]);
if (sourceChar != valueChar)
{
break;
}
}
}
else
{
for (ctrSource = lastSourceStart, ctrValue = 0; ctrValue < valueCount; ctrSource++, ctrValue++)
{
sourceChar = source[ctrSource];
valueChar = value[ctrValue];
if (sourceChar != valueChar)
{
break;
}
}
}
if (ctrValue == valueCount)
{
return(sourceCount - valueCount);
}
}
break;
case FindStringOptions.End:
{
lastSourceStart = sourceCount - valueCount;
if (ignoreCase)
{
char firstValueChar = ToUpper(value[0]);
for (ctrSource = lastSourceStart; ctrSource >= 0; ctrSource--)
{
sourceChar = ToUpper(source[ctrSource]);
if (sourceChar != firstValueChar)
{
continue;
}
for (ctrValue = 1; ctrValue < valueCount; ctrValue++)
{
sourceChar = ToUpper(source[ctrSource + ctrValue]);
valueChar = ToUpper(value[ctrValue]);
if (sourceChar != valueChar)
{
break;
}
}
if (ctrValue == valueCount)
{
return(ctrSource);
}
}
}
else
{
char firstValueChar = value[0];
for (ctrSource = lastSourceStart; ctrSource >= 0; ctrSource--)
{
sourceChar = source[ctrSource];
if (sourceChar != firstValueChar)
{
continue;
}
for (ctrValue = 1; ctrValue < valueCount; ctrValue++)
{
sourceChar = source[ctrSource + ctrValue];
valueChar = value[ctrValue];
if (sourceChar != valueChar)
{
break;
}
}
if (ctrValue == valueCount)
{
return(ctrSource);
}
}
}
}
break;
default:
return(-1);
}
return(-1);
}
