ICU-531.30.tar.gz

[apple/icu.git] / icuSources / layout / ScriptAndLanguage.cpp

diff --git a/icuSources/layout/ScriptAndLanguage.cpp b/icuSources/layout/ScriptAndLanguage.cpp
index 126f5f2f0785f6c6299d9158fc7ea7fc276e5afb..c7818d1866016fd8d6ec5a95ce3f0e540767b6dc 100644 (file)
--- a/icuSources/layout/ScriptAndLanguage.cpp
+++ b/icuSources/layout/ScriptAndLanguage.cpp
@@ -1,5 +1,5 @@
 /*
- * (C) Copyright IBM Corp. 1998-2008 - All Rights Reserved
+ * (C) Copyright IBM Corp. 1998-2013 - All Rights Reserved
  *
  */
 
@@ -11,29 +11,33 @@
 
 U_NAMESPACE_BEGIN
 
-const LangSysTable *ScriptTable::findLanguage(LETag languageTag, le_bool exactMatch) const
+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) {
-        Offset foundOffset =
-            OpenTypeUtilities::getTagOffset(languageTag, langSysRecordArray, count);
-
-        if (foundOffset != 0) {
-            langSysTableOffset = foundOffset;
-        }
+      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 (const LangSysTable *) ((char *)this + langSysTableOffset);
+      return LEReferenceTo<LangSysTable>(base, success, langSysTableOffset);
     }
 
-    return NULL;
+    return LEReferenceTo<LangSysTable>();
 }
 
-const ScriptTable *ScriptListTable::findScript(LETag scriptTag) const
+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,
@@ -47,38 +51,54 @@ const ScriptTable *ScriptListTable::findScript(LETag scriptTag) const
      * 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.
-        for(le_int32 s = 0; s < limit; s += 1) {
-            if (SWAPT(scriptRecordArray[s].tag) == scriptTag) {
-                scriptTableOffset = SWAPW(scriptRecordArray[s].offset);
-                break;
-            }
+        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 {
-        scriptTableOffset = OpenTypeUtilities::getTagOffset(scriptTag, scriptRecordArray, count);
+      LEReferenceToArrayOf<ScriptRecord> scriptRecordArrayRef(base, success, &scriptRecordArray[0], count);
+      
+      scriptTableOffset = OpenTypeUtilities::getTagOffset(scriptTag, scriptRecordArrayRef, success);
     }
 
     if (scriptTableOffset != 0) {
-        return (const ScriptTable *) ((char *)this + scriptTableOffset);
+      return LEReferenceTo<ScriptTable>(base, success, scriptTableOffset);
     }
 
-    return NULL;
+  return LEReferenceTo<ScriptTable>();
 }
 
-const LangSysTable *ScriptListTable::findLanguage(LETag scriptTag, LETag languageTag, le_bool exactMatch) const
+LEReferenceTo<LangSysTable>  ScriptListTable::findLanguage(const LETableReference &base, LETag scriptTag, LETag languageTag, LEErrorCode &success, le_bool exactMatch) const 
 {
-    const ScriptTable *scriptTable = findScript(scriptTag);
+  const LEReferenceTo<ScriptTable> scriptTable = findScript(base, scriptTag, success);
 
-    if (scriptTable == 0) {
-        return NULL;
-    }
+  if (scriptTable.isEmpty()) {
+    return LEReferenceTo<LangSysTable>();
+  }
 
-    return scriptTable->findLanguage(languageTag, exactMatch);
+  return scriptTable->findLanguage(scriptTable, languageTag, success, exactMatch).reparent(base);
 }
 
 U_NAMESPACE_END