fix wrong length in remote schema

Change-Id: Ia96ddf5746f1c18968e9e086f17fe4a24b8480d7

include/rapidjson/schema.h

@@ -1473,7 +1473,7 @@ private:
 
                 if (i > 0) { // Remote reference, resolve immediately
                     if (remoteProvider_) {
-                        if (const GenericSchemaDocument* remoteDocument = remoteProvider_->GetRemoteDocument(s, i - 1)) {
+                        if (const GenericSchemaDocument* remoteDocument = remoteProvider_->GetRemoteDocument(s, i)) {
                             PointerType pointer(&s[i], len - i, allocator_);
                             if (pointer.IsValid()) {
                                 if (const SchemaType* sc = remoteDocument->GetSchema(pointer)) {

test/unittest/schematest.cpp

@@ -1101,7 +1101,7 @@ public:
         };
 
         for (size_t i = 0; i < kCount; i++)
-            if (strncmp(uri, uris[i], length) == 0)
+            if (strncmp(uri, uris[i], length) == 0 && strlen(uris[i]) == length)
                 return sd_[i];
         return 0;
     }