From 7d9b7394dde4e5e20b72bc0453c6026f43ed8495 Mon Sep 17 00:00:00 2001
From: B3n30 <benediktthomas@gmail.com>
Date: Sat, 8 Jul 2017 15:50:59 +0200
Subject: Network: Added Packet class for serialization

---
 src/network/packet.cpp | 229 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 229 insertions(+)
 create mode 100644 src/network/packet.cpp

(limited to 'src/network/packet.cpp')

diff --git a/src/network/packet.cpp b/src/network/packet.cpp
new file mode 100644
index 000000000..b3a61d824
--- /dev/null
+++ b/src/network/packet.cpp
@@ -0,0 +1,229 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#ifdef _WIN32
+#include <winsock2.h>
+#else
+#include <arpa/inet.h>
+#endif
+#include <cstring>
+#include <string>
+#include "network/packet.h"
+
+namespace Network {
+
+Packet::Packet() : read_pos(0), is_valid(true) {}
+
+Packet::~Packet() {}
+
+void Packet::Append(const void* in_data, std::size_t size_in_bytes) {
+    if (in_data && (size_in_bytes > 0)) {
+        std::size_t start = data.size();
+        data.resize(start + size_in_bytes);
+        std::memcpy(&data[start], in_data, size_in_bytes);
+    }
+}
+
+void Packet::Read(void* out_data, std::size_t size_in_bytes) {
+    if (out_data && CheckSize(size_in_bytes)) {
+        std::memcpy(out_data, &data[read_pos], size_in_bytes);
+        read_pos += size_in_bytes;
+    }
+}
+
+void Packet::Clear() {
+    data.clear();
+    read_pos = 0;
+    is_valid = true;
+}
+
+const void* Packet::GetData() const {
+    return !data.empty() ? &data[0] : NULL;
+}
+
+void Packet::IgnoreBytes(u32 length) {
+    read_pos += length;
+}
+
+std::size_t Packet::GetDataSize() const {
+    return data.size();
+}
+
+bool Packet::EndOfPacket() const {
+    return read_pos >= data.size();
+}
+
+Packet::operator BoolType() const {
+    return is_valid ? &Packet::CheckSize : NULL;
+}
+
+Packet& Packet::operator>>(bool& out_data) {
+    u8 value;
+    if (*this >> value) {
+        out_data = (value != 0);
+    }
+    return *this;
+}
+
+Packet& Packet::operator>>(s8& out_data) {
+    Read(&out_data, sizeof(out_data));
+    return *this;
+}
+
+Packet& Packet::operator>>(u8& out_data) {
+    Read(&out_data, sizeof(out_data));
+    return *this;
+}
+
+Packet& Packet::operator>>(s16& out_data) {
+    s16 value;
+    Read(&value, sizeof(value));
+    out_data = ntohs(value);
+    return *this;
+}
+
+Packet& Packet::operator>>(u16& out_data) {
+    u16 value;
+    Read(&value, sizeof(value));
+    out_data = ntohs(value);
+    return *this;
+}
+
+Packet& Packet::operator>>(s32& out_data) {
+    s32 value;
+    Read(&value, sizeof(value));
+    out_data = ntohl(value);
+    return *this;
+}
+
+Packet& Packet::operator>>(u32& out_data) {
+    u32 value;
+    Read(&value, sizeof(value));
+    out_data = ntohl(value);
+    return *this;
+}
+
+Packet& Packet::operator>>(float& out_data) {
+    Read(&out_data, sizeof(out_data));
+    return *this;
+}
+
+Packet& Packet::operator>>(double& out_data) {
+    Read(&out_data, sizeof(out_data));
+    return *this;
+}
+
+Packet& Packet::operator>>(char* out_data) {
+    // First extract string length
+    u32 length = 0;
+    *this >> length;
+
+    if ((length > 0) && CheckSize(length)) {
+        // Then extract characters
+        std::memcpy(out_data, &data[read_pos], length);
+        out_data[length] = '\0';
+
+        // Update reading position
+        read_pos += length;
+    }
+
+    return *this;
+}
+
+Packet& Packet::operator>>(std::string& out_data) {
+    // First extract string length
+    u32 length = 0;
+    *this >> length;
+
+    out_data.clear();
+    if ((length > 0) && CheckSize(length)) {
+        // Then extract characters
+        out_data.assign(&data[read_pos], length);
+
+        // Update reading position
+        read_pos += length;
+    }
+
+    return *this;
+}
+
+Packet& Packet::operator<<(bool in_data) {
+    *this << static_cast<u8>(in_data);
+    return *this;
+}
+
+Packet& Packet::operator<<(s8 in_data) {
+    Append(&in_data, sizeof(in_data));
+    return *this;
+}
+
+Packet& Packet::operator<<(u8 in_data) {
+    Append(&in_data, sizeof(in_data));
+    return *this;
+}
+
+Packet& Packet::operator<<(s16 in_data) {
+    s16 toWrite = htons(in_data);
+    Append(&toWrite, sizeof(toWrite));
+    return *this;
+}
+
+Packet& Packet::operator<<(u16 in_data) {
+    u16 toWrite = htons(in_data);
+    Append(&toWrite, sizeof(toWrite));
+    return *this;
+}
+
+Packet& Packet::operator<<(s32 in_data) {
+    s32 toWrite = htonl(in_data);
+    Append(&toWrite, sizeof(toWrite));
+    return *this;
+}
+
+Packet& Packet::operator<<(u32 in_data) {
+    u32 toWrite = htonl(in_data);
+    Append(&toWrite, sizeof(toWrite));
+    return *this;
+}
+
+Packet& Packet::operator<<(float in_data) {
+    Append(&in_data, sizeof(in_data));
+    return *this;
+}
+
+Packet& Packet::operator<<(double in_data) {
+    Append(&in_data, sizeof(in_data));
+    return *this;
+}
+
+Packet& Packet::operator<<(const char* in_data) {
+    // First insert string length
+    u32 length = std::strlen(in_data);
+    *this << length;
+
+    // Then insert characters
+    Append(in_data, length * sizeof(char));
+
+    return *this;
+}
+
+Packet& Packet::operator<<(const std::string& in_data) {
+    // First insert string length
+    u32 length = static_cast<u32>(in_data.size());
+    *this << length;
+
+    // Then insert characters
+    if (length > 0)
+        Append(in_data.c_str(), length * sizeof(std::string::value_type));
+
+    return *this;
+}
+
+bool Packet::CheckSize(std::size_t size) {
+    is_valid = is_valid && (read_pos + size <= data.size());
+
+    return is_valid;
+}
+
+} // namespace Network
-- 
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