1 files changed, 120 insertions, 0 deletions
diff --git a/Userland/Libraries/LibTLS/TLSPacketBuilder.h b/Userland/Libraries/LibTLS/TLSPacketBuilder.h
new file mode 100644
index 0000000000..2994ed27ab
--- /dev/null
+++ b/Userland/Libraries/LibTLS/TLSPacketBuilder.h
@@ -0,0 +1,120 @@
+/*
+ * Copyright (c) 2020, Ali Mohammad Pur <ali.mpfard@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <AK/ByteBuffer.h>
+#include <AK/Endian.h>
+#include <AK/Types.h>
+
+namespace TLS {
+
+enum class MessageType : u8 {
+    ChangeCipher = 0x14,
+    Alert = 0x15,
+    Handshake = 0x16,
+    ApplicationData = 0x17,
+};
+
+enum class Version : u16 {
+    V10 = 0x0301,
+    V11 = 0x0302,
+    V12 = 0x0303,
+    V13 = 0x0304
+};
+
+class PacketBuilder {
+public:
+    PacketBuilder(MessageType type, u16 version, size_t size_hint = 0xfdf)
+        : PacketBuilder(type, (Version)version, size_hint)
+    {
+    }
+
+    PacketBuilder(MessageType type, Version version, size_t size_hint = 0xfdf)
+    {
+        m_packet_data = ByteBuffer::create_uninitialized(size_hint + 16);
+        m_current_length = 5;
+        m_packet_data[0] = (u8)type;
+        *(u16*)m_packet_data.offset_pointer(1) = AK::convert_between_host_and_network_endian((u16)version);
+    }
+
+    inline void append(u16 value)
+    {
+        value = AK::convert_between_host_and_network_endian(value);
+        append((const u8*)&value, sizeof(value));
+    }
+    inline void append(u8 value)
+    {
+        append((const u8*)&value, sizeof(value));
+    }
+    inline void append(ReadonlyBytes data)
+    {
+        append(data.data(), data.size());
+    }
+    inline void append_u24(u32 value)
+    {
+        u8 buf[3];
+        buf[0] = value / 0x10000;
+        value %= 0x10000;
+        buf[1] = value / 0x100;
+        value %= 0x100;
+        buf[2] = value;
+
+        append(buf, 3);
+    }
+    inline void append(const u8* data, size_t bytes)
+    {
+        if (bytes == 0)
+            return;
+
+        auto old_length = m_current_length;
+        m_current_length += bytes;
+
+        if (m_packet_data.size() < m_current_length) {
+            m_packet_data.grow(m_current_length);
+        }
+
+        m_packet_data.overwrite(old_length, data, bytes);
+    }
+    inline ByteBuffer build()
+    {
+        auto length = m_current_length;
+        m_current_length = 0;
+        return m_packet_data.slice(0, length);
+    }
+    inline void set(size_t offset, u8 value)
+    {
+        ASSERT(offset < m_current_length);
+        m_packet_data[offset] = value;
+    }
+    size_t length() const { return m_current_length; }
+
+private:
+    ByteBuffer m_packet_data;
+    size_t m_current_length;
+};
+
+}