| /* |
| * (C) Copyright IBM Corp. 1998-2013 - All Rights Reserved |
| * |
| */ |
| |
| #include "LETypes.h" |
| #include "OpenTypeTables.h" |
| #include "OpenTypeUtilities.h" |
| #include "ScriptAndLanguage.h" |
| #include "LESwaps.h" |
| |
| U_NAMESPACE_BEGIN |
| |
| LEReferenceTo<LangSysTable> ScriptTable::findLanguage(const LETableReference& base, LETag languageTag, LEErrorCode &success, le_bool exactMatch) const |
| { |
| le_uint16 count = SWAPW(langSysCount); |
| Offset langSysTableOffset = exactMatch? 0 : SWAPW(defaultLangSysTableOffset); |
| |
| if (count > 0) { |
| LEReferenceToArrayOf<TagAndOffsetRecord> langSysRecords(base, success, langSysRecordArray, count); |
| Offset foundOffset = |
| OpenTypeUtilities::getTagOffset(languageTag, langSysRecords, success); |
| |
| if (foundOffset != 0 && LE_SUCCESS(success)) { |
| langSysTableOffset = foundOffset; |
| } |
| } |
| |
| if (langSysTableOffset != 0) { |
| return LEReferenceTo<LangSysTable>(base, success, langSysTableOffset); |
| } |
| |
| return LEReferenceTo<LangSysTable>(); |
| } |
| |
| LEReferenceTo<ScriptTable> ScriptListTable::findScript(const LETableReference &base, LETag scriptTag, LEErrorCode &success) const |
| { |
| if (LE_FAILURE(success) ) { |
| return LEReferenceTo<ScriptTable>(); // get out |
| } |
| /* |
| * 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); |
| |
| if (count == 0) { |
| return LEReferenceTo<ScriptTable>(); // no items, no search |
| } |
| |
| // attempt to construct a ref with at least one element |
| LEReferenceToArrayOf<ScriptRecord> oneElementTable(base, success, &scriptRecordArray[0], 1); |
| |
| if( LE_FAILURE(success) ) { |
| return LEReferenceTo<ScriptTable>(); // couldn't even read the first record - bad font. |
| } |
| |
| 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. |
| LEReferenceToArrayOf<ScriptRecord> scriptRecordArrayRef(base, success, &scriptRecordArray[0], limit); |
| for(le_int32 s = 0; (s < limit)&&LE_SUCCESS(success); s += 1) { |
| if (SWAPT(scriptRecordArrayRef(s,success).tag) == scriptTag) { |
| scriptTableOffset = SWAPW(scriptRecordArrayRef(s,success).offset); |
| break; |
| } |
| } |
| } else { |
| LEReferenceToArrayOf<ScriptRecord> scriptRecordArrayRef(base, success, &scriptRecordArray[0], count); |
| |
| scriptTableOffset = OpenTypeUtilities::getTagOffset(scriptTag, scriptRecordArrayRef, success); |
| } |
| |
| if (scriptTableOffset != 0) { |
| return LEReferenceTo<ScriptTable>(base, success, scriptTableOffset); |
| } |
| |
| return LEReferenceTo<ScriptTable>(); |
| } |
| |
| LEReferenceTo<LangSysTable> ScriptListTable::findLanguage(const LETableReference &base, LETag scriptTag, LETag languageTag, LEErrorCode &success, le_bool exactMatch) const |
| { |
| const LEReferenceTo<ScriptTable> scriptTable = findScript(base, scriptTag, success); |
| |
| if (scriptTable.isEmpty()) { |
| return LEReferenceTo<LangSysTable>(); |
| } |
| |
| return scriptTable->findLanguage(scriptTable, languageTag, success, exactMatch).reparent(base); |
| } |
| |
| U_NAMESPACE_END |