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-rw-r--r--Build/source/libs/icu/icu-50.1/layout/ScriptAndLanguage.cpp84
1 files changed, 84 insertions, 0 deletions
diff --git a/Build/source/libs/icu/icu-50.1/layout/ScriptAndLanguage.cpp b/Build/source/libs/icu/icu-50.1/layout/ScriptAndLanguage.cpp
new file mode 100644
index 00000000000..126f5f2f078
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+++ b/Build/source/libs/icu/icu-50.1/layout/ScriptAndLanguage.cpp
@@ -0,0 +1,84 @@
+/*
+ * (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