85 lines
2.7 KiB
C++
85 lines
2.7 KiB
C++
/*
|
|
* (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
|