Replace NULL with nullptr or null in webrtc/base/.

webrtc/base/sslfingerprint.cc

 /*
  *  Copyright 2012 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include "webrtc/base/sslfingerprint.h"
 
 #include <ctype.h>
 #include <string>
 
 #include "webrtc/base/helpers.h"
 #include "webrtc/base/logging.h"
 #include "webrtc/base/messagedigest.h"
 #include "webrtc/base/stringencode.h"
 
 namespace rtc {
 
 SSLFingerprint* SSLFingerprint::Create(
     const std::string& algorithm, const rtc::SSLIdentity* identity) {
   if (!identity) {
-    return NULL;
+    return nullptr;
   }
 
   return Create(algorithm, &(identity->certificate()));
 }
 
 SSLFingerprint* SSLFingerprint::Create(
     const std::string& algorithm, const rtc::SSLCertificate* cert) {
   uint8_t digest_val[64];
   size_t digest_len;
   bool ret = cert->ComputeDigest(
       algorithm, digest_val, sizeof(digest_val), &digest_len);
   if (!ret) {
-    return NULL;
+    return nullptr;
   }
 
   return new SSLFingerprint(algorithm, digest_val, digest_len);
 }
 
 SSLFingerprint* SSLFingerprint::CreateFromRfc4572(
     const std::string& algorithm, const std::string& fingerprint) {
   if (algorithm.empty() || !rtc::IsFips180DigestAlgorithm(algorithm))
-    return NULL;
+    return nullptr;
 
   if (fingerprint.empty())
-    return NULL;
+    return nullptr;
 
   size_t value_len;
   char value[rtc::MessageDigest::kMaxSize];
   value_len = rtc::hex_decode_with_delimiter(value, sizeof(value),
                                                    fingerprint.c_str(),
                                                    fingerprint.length(),
                                                    ':');
   if (!value_len)
-    return NULL;
+    return nullptr;
 
   return new SSLFingerprint(algorithm, reinterpret_cast<uint8_t*>(value),
                             value_len);
 }
 
 SSLFingerprint* SSLFingerprint::CreateFromCertificate(
     const RTCCertificate* cert) {
   std::string digest_alg;
   if (!cert->ssl_certificate().GetSignatureDigestAlgorithm(&digest_alg)) {
     LOG(LS_ERROR) << "Failed to retrieve the certificate's digest algorithm";
@@ skipping 32 matching lines @@
 }
 
 std::string SSLFingerprint::ToString() const {
   std::string fp_str = algorithm;
   fp_str.append(" ");
   fp_str.append(GetRfc4572Fingerprint());
   return fp_str;
 }
 
 }  // namespace rtc