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