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/*
* (C) Copyright IBM Corp. 1998-2008 - All Rights Reserved
*
*/
#include "LETypes.h"
#include "OpenTypeTables.h"
#include "OpenTypeUtilities.h"
#include "ScriptAndLanguage.h"
#include "LESwaps.h"
U_NAMESPACE_BEGIN
const LangSysTable *ScriptTable::findLanguage(LETag languageTag, le_bool exactMatch) const
{
le_uint16 count = SWAPW(langSysCount);
Offset langSysTableOffset = exactMatch? 0 : SWAPW(defaultLangSysTableOffset);
if (count > 0) {
Offset foundOffset =
OpenTypeUtilities::getTagOffset(languageTag, langSysRecordArray, count);
if (foundOffset != 0) {
langSysTableOffset = foundOffset;
}
}
if (langSysTableOffset != 0) {
return (const LangSysTable *) ((char *)this + langSysTableOffset);
}
return NULL;
}
const ScriptTable *ScriptListTable::findScript(LETag scriptTag) const
{
/*
* There are some fonts that have a large, bogus value for scriptCount. To try
* and protect against this, we use the offset in the first scriptRecord,
* which we know has to be past the end of the scriptRecordArray, to compute
* a value which is greater than or equal to the actual script count.
*
* Note: normally, the first offset will point to just after the scriptRecordArray,
* but there's no guarantee of this, only that it's *after* the scriptRecordArray.
* Because of this, a binary serach isn't safe, because the new count may include
* data that's not actually in the scriptRecordArray and hence the array will appear
* to be unsorted.
*/
le_uint16 count = SWAPW(scriptCount);
le_uint16 limit = ((SWAPW(scriptRecordArray[0].offset) - sizeof(ScriptListTable)) / sizeof(scriptRecordArray)) + ANY_NUMBER;
Offset scriptTableOffset = 0;
if (count > limit) {
// the scriptCount value is bogus; do a linear search
// because limit may still be too large.
for(le_int32 s = 0; s < limit; s += 1) {
if (SWAPT(scriptRecordArray[s].tag) == scriptTag) {
scriptTableOffset = SWAPW(scriptRecordArray[s].offset);
break;
}
}
} else {
scriptTableOffset = OpenTypeUtilities::getTagOffset(scriptTag, scriptRecordArray, count);
}
if (scriptTableOffset != 0) {
return (const ScriptTable *) ((char *)this + scriptTableOffset);
}
return NULL;
}
const LangSysTable *ScriptListTable::findLanguage(LETag scriptTag, LETag languageTag, le_bool exactMatch) const
{
const ScriptTable *scriptTable = findScript(scriptTag);
if (scriptTable == 0) {
return NULL;
}
return scriptTable->findLanguage(languageTag, exactMatch);
}
U_NAMESPACE_END
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