1 files changed, 127 insertions, 0 deletions
diff --git a/src/lib/tcp/tcp_stream_msg.cc b/src/lib/tcp/tcp_stream_msg.cc
new file mode 100644
index 0000000..89fd5e8
--- /dev/null
+++ b/src/lib/tcp/tcp_stream_msg.cc
@@ -0,0 +1,127 @@
+// Copyright (C) 2022-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <tcp/tcp_stream_msg.h>
+#include <util/strutil.h>
+
+#include <iomanip>
+#include <sstream>
+#include <functional>
+
+namespace isc {
+namespace tcp {
+
+bool
+TcpStreamRequest::needData() const {
+    return (!expected_size_ || (wire_data_.size() < expected_size_));
+}
+
+size_t
+TcpStreamRequest::postBuffer(const void* buf, const size_t nbytes) {
+    if (!nbytes) {
+        // Nothing to do.
+        return (0);
+    }
+
+    const char* bufptr = static_cast<const char*>(buf);
+    size_t bytes_left = nbytes;
+    size_t wire_size = wire_data_.size();
+    size_t bytes_used = 0;
+    while (bytes_left) {
+        if (expected_size_) {
+            // We have the length, copy as much of what we still need as we can.
+            size_t need_bytes = expected_size_ - wire_size;
+            size_t copy_bytes = (need_bytes <= bytes_left ? need_bytes : bytes_left);
+            wire_data_.insert(wire_data_.end(), bufptr, bufptr + copy_bytes);
+            // bytes_left -= copy_bytes;  // Since we break, we don't need to do this anymore.
+            bytes_used += copy_bytes;
+            break;
+        }
+
+        // Otherwise we don't know the length yet.
+        while (wire_size < 2 && bytes_left) {
+            wire_data_.push_back(*bufptr);
+            ++bufptr;
+            --bytes_left;
+            ++bytes_used;
+            ++wire_size;
+        }
+
+        // If we have enough to do it, calculate the expected length.
+        if (wire_size == 2 ) {
+            const uint8_t* cp = static_cast<const uint8_t*>(wire_data_.data());
+            uint16_t len = static_cast<unsigned int>(cp[0]) << 8;
+            len |= static_cast<unsigned int>(cp[1]);
+            expected_size_ = len + sizeof(len);
+        }
+    }
+
+    // Return how much we used.
+    return (bytes_used);
+}
+
+std::string
+TcpStreamRequest::logFormatRequest(const size_t limit) const {
+    std::stringstream output;
+    try {
+        size_t max = (limit && (limit < wire_data_.size()) ? limit : wire_data_.size());
+        output << "expected_size_: " << expected_size_ << ", current size: " << wire_data_.size()
+               << ", data: "
+               << isc::util::str::dumpAsHex(wire_data_.data(), max);
+    } catch (const std::exception& ex) {
+        std::stringstream output;
+        output << "logFormatRequest error: " << ex.what();
+    }
+
+    return (output.str());
+}
+
+void TcpStreamRequest::unpack() {
+    if (needData()) {
+        isc_throw(InvalidOperation, "Cannot unpack an incomplete request");
+    }
+
+    if (wire_data_.size() < sizeof(uint16_t)) {
+        isc_throw(Unexpected, "Request is malformed, too short");
+    }
+
+    request_ = std::vector<uint8_t>(wire_data_.begin() + sizeof(uint16_t), wire_data_.end());
+}
+
+void
+TcpStreamResponse::setResponseData(const uint8_t* data, size_t length) {
+    response_.assign(data, data + length);
+}
+
+void
+TcpStreamResponse::appendResponseData(const uint8_t* data, size_t length) {
+    response_.insert(response_.end(), data, data + length);
+}
+
+void
+TcpStreamResponse::setResponseData(const std::string& str) {
+    response_.assign(str.begin(), str.end());
+}
+
+void
+TcpStreamResponse::appendResponseData(const std::string& str) {
+    response_.insert(response_.end(), str.begin(), str.end());
+}
+
+void
+TcpStreamResponse::pack() {
+    wire_data_.clear();
+    // Prepend the length of the request.
+    uint16_t size = static_cast<uint16_t>(response_.size());
+    wire_data_.push_back(static_cast<uint8_t>((size & 0xff00U) >> 8));
+    wire_data_.push_back(static_cast<uint8_t>(size & 0x00ffU));
+    wire_data_.insert(wire_data_.end(), response_.begin(), response_.end());
+}
+
+} // end of namespace isc::tcp
+} // end of namespace isc