Github user arpadboda commented on a diff in the pull request:
https://github.com/apache/nifi-minifi-cpp/pull/445#discussion_r235707060
--- Diff: libminifi/include/processors/ContentHash.h ---
@@ -0,0 +1,186 @@
+/**
+ * @file ContentHash.h
+ * ContentHash class declaration
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef NIFI_MINIFI_CPP_CONTENTHASH_H
+#define NIFI_MINIFI_CPP_CONTENTHASH_H
+
+#ifdef OPENSSL_SUPPORT
+
+#include <iomanip>
+#include <map>
+#include <memory>
+#include <string>
+#include <sstream>
+#include <utility>
+#include <stdint.h>
+
+#include <openssl/md5.h>
+#include <openssl/sha.h>
+
+#include "FlowFileRecord.h"
+#include "core/Processor.h"
+#include "core/ProcessSession.h"
+#include "core/Resource.h"
+#include "io/BaseStream.h"
+
+using HashReturnType = std::pair<std::string, int64_t>;
+
+namespace {
+#define HASH_BUFFER_SIZE 16384
+
+ std::string digestToString(const unsigned char * const digest, size_t
size) {
+ std::stringstream ss;
+ for(int i = 0; i < size; i++)
+ {
+ ss << std::uppercase << std::hex << std::setw(2) <<
std::setfill('0') << (int)digest[i];
+ }
+ return ss.str();
+ }
+
+ HashReturnType
MD5Hash(std::shared_ptr<org::apache::nifi::minifi::io::BaseStream> stream) {
+ HashReturnType ret_val;
+ ret_val.second = 0;
+ uint8_t buffer[HASH_BUFFER_SIZE];
+ MD5_CTX context;
+ MD5_Init(&context);
+
+ size_t ret = 0;
+ do {
+ ret = stream->readData(buffer, HASH_BUFFER_SIZE);
+ if(ret > 0) {
+ MD5_Update(&context, buffer, ret);
+ ret_val.second += ret;
+ }
+ } while(ret > 0);
+ unsigned char digest[MD5_DIGEST_LENGTH];
+ MD5_Final(digest, &context);
+
+ ret_val.first = digestToString(digest, MD5_DIGEST_LENGTH);
+ return ret_val;
+ }
+
+ HashReturnType
SHA1Hash(std::shared_ptr<org::apache::nifi::minifi::io::BaseStream> stream) {
+ HashReturnType ret_val;
+ ret_val.second = 0;
+ uint8_t buffer[HASH_BUFFER_SIZE];
+ SHA_CTX context;
+ SHA1_Init(&context);
+
+ size_t ret = 0;
+ do {
+ ret = stream->readData(buffer, HASH_BUFFER_SIZE);
+ if(ret > 0) {
+ SHA1_Update(&context, buffer, ret);
+ ret_val.second += ret;
+ }
+ } while(ret > 0);
+ unsigned char digest[SHA_DIGEST_LENGTH];
+ SHA1_Final(digest, &context);
+
+ ret_val.first = digestToString(digest, SHA_DIGEST_LENGTH);
+ return ret_val;
+ }
+
--- End diff --
Honestly I wanted to do but failed, given the digest, the init and the fine
calls, moreover the digest length const all differ.
The header file is pure C, some tempalte magic there could easily help to
reduce code duplication here, but I don't think we should do that and add it
here. Maybe to a util file, but definitely not to a processor.
---
