Check in the pristine copy of ICU 4.6...

icu46/source/common/icudataver.c

+/*
+******************************************************************************
+*
+*   Copyright (C) 2009, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+*
+******************************************************************************
+*/
+
+#include "unicode/utypes.h"
+#include "unicode/icudataver.h"
+#include "unicode/uversion.h"
+#include "unicode/ures.h"
+#include "uresimp.h" /* for ures_getVersionByKey */
+#include "cmemory.h"
+
+/*
+ * Determines if icustd is in the data.
+ */
+static UBool hasICUSTDBundle();
+
+static UBool hasICUSTDBundle() {
+    UErrorCode status = U_ZERO_ERROR;
+    UBool result = TRUE;
+    
+    UResourceBundle *icustdbundle = ures_openDirect(NULL, U_ICU_STD_BUNDLE, &status);
+    if (U_SUCCESS(status)) {
+        result = TRUE;
+    } else {
+        result = FALSE;
+    }
+    
+    ures_close(icustdbundle);
+    
+    return result;
+}
+
+U_CAPI void U_EXPORT2 u_getDataVersion(UVersionInfo dataVersionFillin, UErrorCode *status) {
+    UResourceBundle *icudatares = NULL;
+    
+    if (U_FAILURE(*status)) {
+        return;
+    }
+    
+    if (dataVersionFillin != NULL) {
+        icudatares = ures_openDirect(NULL, U_ICU_VERSION_BUNDLE , status);
+        if (U_SUCCESS(*status)) {
+            ures_getVersionByKey(icudatares, U_ICU_DATA_KEY, dataVersionFillin, status);
+        }
+        ures_close(icudatares);
+    }
+}
+
+U_CAPI UBool U_EXPORT2 u_isDataOlder(UVersionInfo dataVersionFillin, UBool *isModifiedFillin, UErrorCode *status) {
+    UBool result = TRUE;
+    UVersionInfo dataVersion;
+    UVersionInfo wiredVersion;
+    
+    if (U_FAILURE(*status)) {
+        return result;
+    }
+    
+    u_getDataVersion(dataVersion, status);
+    if (U_SUCCESS(*status)) {
+        u_versionFromString(wiredVersion, U_ICU_DATA_VERSION);
+        
+        if (uprv_memcmp(dataVersion, wiredVersion, sizeof(UVersionInfo)) >= 0) {
+            result = FALSE;
+        }
+        
+        if (dataVersionFillin != NULL) {
+            uprv_memcpy(dataVersionFillin, dataVersion, sizeof(UVersionInfo));
+        }
+        
+        if (hasICUSTDBundle()) {
+            *isModifiedFillin = FALSE;
+        } else {
+            *isModifiedFillin = TRUE;
+        }
+    }
+    
+    return result;
+}