2 * (C) Copyright IBM Corp. 1998-2013 - All Rights Reserved
7 #include "OpenTypeTables.h"
8 #include "OpenTypeUtilities.h"
9 #include "ScriptAndLanguage.h"
14 LEReferenceTo<LangSysTable> ScriptTable::findLanguage(const LETableReference& base, LETag languageTag, LEErrorCode &success, le_bool exactMatch) const
16 le_uint16 count = SWAPW(langSysCount);
17 Offset langSysTableOffset = exactMatch? 0 : SWAPW(defaultLangSysTableOffset);
20 LEReferenceToArrayOf<TagAndOffsetRecord> langSysRecords(base, success, langSysRecordArray, count);
22 OpenTypeUtilities::getTagOffset(languageTag, langSysRecords, success);
24 if (foundOffset != 0 && LE_SUCCESS(success)) {
25 langSysTableOffset = foundOffset;
29 if (langSysTableOffset != 0) {
30 return LEReferenceTo<LangSysTable>(base, success, langSysTableOffset);
33 return LEReferenceTo<LangSysTable>();
36 LEReferenceTo<ScriptTable> ScriptListTable::findScript(const LETableReference &base, LETag scriptTag, LEErrorCode &success) const
38 if (LE_FAILURE(success) ) {
39 return LEReferenceTo<ScriptTable>(); // get out
42 * There are some fonts that have a large, bogus value for scriptCount. To try
43 * and protect against this, we use the offset in the first scriptRecord,
44 * which we know has to be past the end of the scriptRecordArray, to compute
45 * a value which is greater than or equal to the actual script count.
47 * Note: normally, the first offset will point to just after the scriptRecordArray,
48 * but there's no guarantee of this, only that it's *after* the scriptRecordArray.
49 * Because of this, a binary serach isn't safe, because the new count may include
50 * data that's not actually in the scriptRecordArray and hence the array will appear
53 le_uint16 count = SWAPW(scriptCount);
56 return LEReferenceTo<ScriptTable>(); // no items, no search
59 // attempt to construct a ref with at least one element
60 LEReferenceToArrayOf<ScriptRecord> oneElementTable(base, success, &scriptRecordArray[0], 1);
62 if( LE_FAILURE(success) ) {
63 return LEReferenceTo<ScriptTable>(); // couldn't even read the first record - bad font.
66 le_uint16 limit = ((SWAPW(scriptRecordArray[0].offset) - sizeof(ScriptListTable)) / sizeof(scriptRecordArray)) + ANY_NUMBER;
67 Offset scriptTableOffset = 0;
71 // the scriptCount value is bogus; do a linear search
72 // because limit may still be too large.
73 LEReferenceToArrayOf<ScriptRecord> scriptRecordArrayRef(base, success, &scriptRecordArray[0], limit);
74 for(le_int32 s = 0; (s < limit)&&LE_SUCCESS(success); s += 1) {
75 if (SWAPT(scriptRecordArrayRef(s,success).tag) == scriptTag) {
76 scriptTableOffset = SWAPW(scriptRecordArrayRef(s,success).offset);
81 LEReferenceToArrayOf<ScriptRecord> scriptRecordArrayRef(base, success, &scriptRecordArray[0], count);
83 scriptTableOffset = OpenTypeUtilities::getTagOffset(scriptTag, scriptRecordArrayRef, success);
86 if (scriptTableOffset != 0) {
87 return LEReferenceTo<ScriptTable>(base, success, scriptTableOffset);
90 return LEReferenceTo<ScriptTable>();
93 LEReferenceTo<LangSysTable> ScriptListTable::findLanguage(const LETableReference &base, LETag scriptTag, LETag languageTag, LEErrorCode &success, le_bool exactMatch) const
95 const LEReferenceTo<ScriptTable> scriptTable = findScript(base, scriptTag, success);
97 if (scriptTable.isEmpty()) {
98 return LEReferenceTo<LangSysTable>();
101 return scriptTable->findLanguage(scriptTable, languageTag, success, exactMatch).reparent(base);