Remove abseil dependency from HexEncode method

Currently the HexEncode method defined in util/stringprintf.h depends on
absl::Span, which is part of abseil. This patch removes the dependency,
allowing the method to be more widely used.
Bug: b/158660166
Change-Id: I37715271391000b5c61d5a657f604db2bc6c882e
Reviewed-on: https://chromium-review.googlesource.com/c/openscreen/+/3001949
Reviewed-by: Jordan Bayles <jophba@chromium.org>
Commit-Queue: Jordan Bayles <jophba@chromium.org>

4 files changed, 10 insertions, 7 deletions

diff --git a/cast/standalone_receiver/cast_service.cc b/cast/standalone_receiver/cast_service.cc
index 009190b0..0e3d9c9c 100644
--- a/cast/standalone_receiver/cast_service.cc
+++ b/cast/standalone_receiver/cast_service.cc
@@ -69,7 +69,8 @@ CastService::CastService(CastService::Configuration config)
   if (discovery_publisher_) {
     ReceiverInfo info;
     info.port = local_endpoint_.port;
-    info.unique_id = HexEncode(config.interface.hardware_address);
+    info.unique_id = HexEncode(config.interface.hardware_address.data(),
+                               config.interface.hardware_address.size());
     info.friendly_name = config.friendly_name;
     info.model_name = config.model_name;
     info.capabilities = kHasVideoOutput | kHasAudioOutput;
diff --git a/cast/streaming/offer_messages.cc b/cast/streaming/offer_messages.cc
index 3e816026..eeefcc5d 100644
--- a/cast/streaming/offer_messages.cc
+++ b/cast/streaming/offer_messages.cc
@@ -202,8 +202,8 @@ Json::Value Stream::ToJson() const {
                 "this code assumes Ssrc fits in a Json::UInt");
   root["ssrc"] = static_cast<Json::UInt>(ssrc);
   root["targetDelay"] = static_cast<int>(target_delay.count());
-  root["aesKey"] = HexEncode(aes_key);
-  root["aesIvMask"] = HexEncode(aes_iv_mask);
+  root["aesKey"] = HexEncode(aes_key.data(), aes_key.size());
+  root["aesIvMask"] = HexEncode(aes_iv_mask.data(), aes_iv_mask.size());
   root["receiverRtcpEventLog"] = receiver_rtcp_event_log;
   root["receiverRtcpDscp"] = receiver_rtcp_dscp;
   root["timeBase"] = "1/" + std::to_string(rtp_timebase);
diff --git a/cast/streaming/receiver_packet_router.cc b/cast/streaming/receiver_packet_router.cc
index 1ac4266a..23b99ce4 100644
--- a/cast/streaming/receiver_packet_router.cc
+++ b/cast/streaming/receiver_packet_router.cc
@@ -73,10 +73,11 @@ void ReceiverPacketRouter::OnReceivedPacket(const IPEndpoint& source,
       InspectPacketForRouting(packet);
   if (seems_like.first == ApparentPacketType::UNKNOWN) {
     constexpr int kMaxPartiaHexDumpSize = 96;
+    const std::size_t encode_size =
+        std::min(packet.size(), static_cast<size_t>(kMaxPartiaHexDumpSize));
     OSP_LOG_WARN << "UNKNOWN packet of " << packet.size()
                  << " bytes. Partial hex dump: "
-                 << HexEncode(absl::Span<const uint8_t>(packet).subspan(
-                        0, kMaxPartiaHexDumpSize));
+                 << HexEncode(packet.data(), encode_size);
     return;
   }
   auto it = receivers_.find(seems_like.second);
diff --git a/cast/streaming/sender_packet_router.cc b/cast/streaming/sender_packet_router.cc
index c2b23dbf..684b1fb2 100644
--- a/cast/streaming/sender_packet_router.cc
+++ b/cast/streaming/sender_packet_router.cc
@@ -102,10 +102,11 @@ void SenderPacketRouter::OnReceivedPacket(const IPEndpoint& source,
       InspectPacketForRouting(packet);
   if (seems_like.first != ApparentPacketType::RTCP) {
     constexpr int kMaxPartiaHexDumpSize = 96;
+    const std::size_t encode_size =
+        std::min(packet.size(), static_cast<size_t>(kMaxPartiaHexDumpSize));
     OSP_LOG_WARN << "UNKNOWN packet of " << packet.size()
                  << " bytes. Partial hex dump: "
-                 << HexEncode(absl::Span<const uint8_t>(packet).subspan(
-                        0, kMaxPartiaHexDumpSize));
+                 << HexEncode(packet.data(), encode_size);
     return;
   }
   const auto it = FindEntry(seems_like.second);