use VarInt

src/Common/Compression.cpp

@@ -0,0 +1,68 @@
+#include "Compression.h"
+
+#include "VarInt.h"
+
+#include <cassert>
+#include <zlib.h>
+
+#define COMPRESSION_THRESHOLD 64
+
+static DataBuffer Inflate(const std::uint8_t* source, std::size_t size, std::size_t uncompressedSize) {
+	DataBuffer result;
+	result.Resize(uncompressedSize);
+
+	uncompress(reinterpret_cast<Bytef*>(result.data()), reinterpret_cast<uLongf*>(&uncompressedSize),
+		reinterpret_cast<const Bytef*>(source), static_cast<uLong>(size));
+
+	assert(result.GetSize() == uncompressedSize);
+	return result;
+}
+
+static DataBuffer Deflate(const std::uint8_t* source, std::size_t size) {
+	DataBuffer result;
+	uLongf compressedSize = size;
+
+	result.Resize(size);  // Resize for the compressed data to fit into
+	compress(
+		reinterpret_cast<Bytef*>(result.data()), &compressedSize, reinterpret_cast<const Bytef*>(source), static_cast<uLong>(size));
+	result.Resize(compressedSize);	// Resize to cut useless data
+
+	return result;
+}
+
+DataBuffer Compress(const DataBuffer& buffer) {
+	DataBuffer packet;
+
+	if (buffer.GetSize() < COMPRESSION_THRESHOLD) {
+		// Don't compress since it's a small packet
+		VarInt compressedDataLength = 0;
+		packet << compressedDataLength;
+		packet << buffer;
+		return packet;
+	}
+
+	DataBuffer compressedData = Deflate(buffer.data(), buffer.GetSize());
+
+	VarInt uncompressedDataLength = buffer.GetSize();
+	packet << uncompressedDataLength;
+	packet.WriteSome(compressedData.data(), compressedData.GetSize());
+	return packet;
+}
+
+DataBuffer Decompress(DataBuffer& buffer, std::uint64_t packetLength) {
+	VarInt uncompressedLength;
+	buffer >> uncompressedLength;
+
+	std::uint64_t compressedLength = packetLength - uncompressedLength.GetSerializedLength();
+
+	if (uncompressedLength.GetValue() == 0) {
+		// Data already uncompressed. Nothing to do
+		DataBuffer ret;
+		buffer.ReadSome(ret, compressedLength);
+		return ret;
+	}
+
+	assert(buffer.GetReadOffset() + compressedLength <= buffer.GetSize());
+
+	return Inflate(buffer.data() + buffer.GetReadOffset(), compressedLength, uncompressedLength.GetValue());
+}

src/Common/Compression.h

@@ -0,0 +1,23 @@
+#pragma once
+
+/**
+ * \file Compression.h
+ * \brief File containing compress utilities
+ */
+
+#include "DataBuffer.h"
+
+/**
+ * \brief Compress some data
+ * \param buffer the data to compress
+ * \return the compressed data
+ */
+DataBuffer Compress(const DataBuffer& buffer);
+
+/**
+ * \brief Uncompress some data
+ * \param buffer the data to uncompress
+ * \param packetLength lenght of data
+ * \return the uncompressed data
+ */
+DataBuffer Decompress(DataBuffer& buffer, std::uint64_t packetLength);

src/Common/DataBuffer.cpp

@@ -0,0 +1,98 @@
+#include "DataBuffer.h"
+
+#include <fstream>
+#include <iomanip>
+#include <sstream>
+#include <iostream>
+
+DataBuffer::DataBuffer(std::size_t initalCapacity) : m_ReadOffset(0) {
+	m_Buffer.reserve(initalCapacity);
+}
+
+DataBuffer::DataBuffer() : m_ReadOffset(0) {}
+
+DataBuffer::DataBuffer(const DataBuffer& other) : m_Buffer(other.m_Buffer), m_ReadOffset(other.m_ReadOffset) {}
+
+DataBuffer::DataBuffer(DataBuffer&& other) : m_Buffer(std::move(other.m_Buffer)), m_ReadOffset(std::move(other.m_ReadOffset)) {}
+
+DataBuffer::DataBuffer(const std::string& str) : m_Buffer(str.begin(), str.end()), m_ReadOffset(0) {}
+
+DataBuffer::DataBuffer(const DataBuffer& other, Data::difference_type offset) : m_ReadOffset(0) {
+	m_Buffer.reserve(other.GetSize() - static_cast<std::size_t>(offset));
+	std::copy(other.m_Buffer.begin() + offset, other.m_Buffer.end(), std::back_inserter(m_Buffer));
+}
+
+DataBuffer& DataBuffer::operator=(const DataBuffer& other) {
+	m_Buffer = other.m_Buffer;
+	m_ReadOffset = other.m_ReadOffset;
+	return *this;
+}
+
+DataBuffer& DataBuffer::operator=(DataBuffer&& other) {
+	m_Buffer = std::move(other.m_Buffer);
+	m_ReadOffset = std::move(other.m_ReadOffset);
+	return *this;
+}
+
+void DataBuffer::SetReadOffset(std::size_t pos) {
+	assert(pos <= GetSize());
+	m_ReadOffset = pos;
+}
+
+std::size_t DataBuffer::GetSize() const {
+	return m_Buffer.size();
+}
+
+std::size_t DataBuffer::GetRemaining() const {
+	return m_Buffer.size() - m_ReadOffset;
+}
+
+DataBuffer::iterator DataBuffer::begin() {
+	return m_Buffer.begin();
+}
+
+DataBuffer::iterator DataBuffer::end() {
+	return m_Buffer.end();
+}
+
+DataBuffer::const_iterator DataBuffer::begin() const {
+	return m_Buffer.begin();
+}
+
+DataBuffer::const_iterator DataBuffer::end() const {
+	return m_Buffer.end();
+}
+
+std::ostream& operator<<(std::ostream& os, const DataBuffer& buffer) {
+	for (unsigned char u : buffer)
+		os << std::hex << std::setfill('0') << std::setw(2) << static_cast<int>(u) << " ";
+	os << std::dec;
+	return os;
+}
+
+bool DataBuffer::ReadFile(const std::string& fileName) {
+	try {
+		std::ifstream file(fileName, std::istream::binary);
+		std::ostringstream ss;
+		ss << file.rdbuf();
+		const std::string& s = ss.str();
+		m_Buffer = DataBuffer::Data(s.begin(), s.end());
+		m_ReadOffset = 0;
+	} catch (std::exception& e) {
+		std::cerr << "Failed to read file : " << e.what() << std::endl;
+		return false;
+	}
+	return m_Buffer.size() > 0;
+}
+
+bool DataBuffer::WriteFile(const std::string& fileName) const {
+	try {
+		std::ofstream file(fileName, std::ostream::binary);
+		file.write(reinterpret_cast<const char*>(m_Buffer.data()), static_cast<std::streamsize>(m_Buffer.size()));
+		file.flush();
+	} catch (std::exception& e) {
+		std::cerr << "Failed to write file : " << e.what() << std::endl;
+		return false;
+	}
+	return true;
+}

src/Common/DataBuffer.h

@@ -0,0 +1,284 @@
+#pragma once
+
+/**
+ * \file DataBuffer.h
+ * \brief File containing the blitz::DataBuffer class
+ */
+
+#include <algorithm>
+#include <cassert>
+#include <cstdint>
+#include <cstring>
+#include <string>
+#include <vector>
+
+/**
+ * \class DataBuffer
+ * \brief Class used to manipulate memory
+ */
+class DataBuffer {
+  private:
+	typedef std::vector<std::uint8_t> Data;
+	Data m_Buffer;
+	std::size_t m_ReadOffset;
+
+  public:
+	typedef Data::iterator iterator;
+	typedef Data::const_iterator const_iterator;
+	typedef Data::reference reference;
+	typedef Data::const_reference const_reference;
+	typedef Data::difference_type difference_type;
+
+	DataBuffer();
+	DataBuffer(std::size_t initalCapacity);
+	DataBuffer(const DataBuffer& other);
+	DataBuffer(const DataBuffer& other, difference_type offset);
+	DataBuffer(DataBuffer&& other);
+	DataBuffer(const std::string& str);
+
+	DataBuffer& operator=(const DataBuffer& other);
+	DataBuffer& operator=(DataBuffer&& other);
+
+	/**
+	 * \brief Append data to the buffer
+	 */
+	template <typename T>
+	void Append(const T& data) {
+		std::size_t size = sizeof(data);
+		std::size_t end_pos = m_Buffer.size();
+		m_Buffer.resize(m_Buffer.size() + size);
+		std::memcpy(&m_Buffer[end_pos], &data, size);
+	}
+
+	/**
+	 * \brief Append data to the buffer
+	 */
+	template <typename T>
+	DataBuffer& operator<<(const T& data) {
+		Append(data);
+		return *this;
+	}
+
+	/**
+	 * \brief Append a string to the buffer
+	 * \warning Don't use it for binary data !
+	 * \param str The string to append
+	 */
+	DataBuffer& operator<<(const std::string& str) {
+		std::size_t strlen = str.length() + 1;	// including null character
+		Resize(GetSize() + strlen);
+		std::memcpy(m_Buffer.data() + GetSize() - strlen, str.data(), strlen);
+		return *this;
+	}
+
+	/**
+	 * \brief Append data to the buffer from another const buffer
+	 * \param data The buffer to append
+	 */
+	DataBuffer& operator<<(const DataBuffer& data) {
+		m_Buffer.insert(m_Buffer.end(), data.begin(), data.end());
+		return *this;
+	}
+
+	/**
+	 * \brief Read some data from the buffer and assign to desired variable
+	 */
+	template <typename T>
+	DataBuffer& operator>>(T& data) {
+		assert(m_ReadOffset + sizeof(T) <= GetSize());
+		data = *(reinterpret_cast<T*>(&m_Buffer[m_ReadOffset]));
+		m_ReadOffset += sizeof(T);
+		return *this;
+	}
+
+	/**
+	 * \brief Read some data from the buffer and assign to the new buffer
+	 * \param data The buffer to assign
+	 */
+	DataBuffer& operator>>(DataBuffer& data) {
+		data.Resize(GetSize() - m_ReadOffset);
+		std::copy(m_Buffer.begin() + static_cast<difference_type>(m_ReadOffset), m_Buffer.end(), data.begin());
+		m_ReadOffset = m_Buffer.size();
+		return *this;
+	}
+
+	/**
+	 * \brief Read a string from the buffer
+	 * \param str The string to assign in the new buffer
+	 * \warning Don't use it for binary data !
+	 */
+	DataBuffer& operator>>(std::string& str) {
+		std::size_t stringSize =
+			strlen(reinterpret_cast<const char*>(m_Buffer.data()) + m_ReadOffset) + 1;	// including null character
+		str.resize(stringSize);
+		std::copy(m_Buffer.begin() + static_cast<difference_type>(m_ReadOffset),
+			m_Buffer.begin() + static_cast<difference_type>(m_ReadOffset + stringSize), str.begin());
+		m_ReadOffset += stringSize;
+		return *this;
+	}
+
+	/**
+	 * \brief Write some data to the buffer
+	 * \param buffer The buffer to write
+	 * \param amount The amount of data to write
+	 */
+	void WriteSome(const char* buffer, std::size_t amount) {
+		std::size_t end_pos = m_Buffer.size();
+		m_Buffer.resize(m_Buffer.size() + amount);
+		std::memcpy(m_Buffer.data() + end_pos, buffer, amount);
+	}
+
+	/**
+	 * \brief Write some data to the buffer
+	 * \param buffer The buffer to write
+	 * \param amount The amount of data to write
+	 */
+	void WriteSome(const std::uint8_t* buffer, std::size_t amount) {
+		std::size_t end_pos = m_Buffer.size();
+		m_Buffer.resize(m_Buffer.size() + amount);
+		std::memcpy(m_Buffer.data() + end_pos, buffer, amount);
+	}
+
+	/**
+	 * \brief Read some data from the buffer
+	 * \param buffer The buffer to Read
+	 * \param amount The amount of data from the buffer
+	 */
+	void ReadSome(char* buffer, std::size_t amount) {
+		assert(m_ReadOffset + amount <= GetSize());
+		std::copy_n(m_Buffer.begin() + static_cast<difference_type>(m_ReadOffset), amount, buffer);
+		m_ReadOffset += amount;
+	}
+
+	/**
+	 * \brief Read some data from the buffer
+	 * \param buffer The buffer to Read
+	 * \param amount The amount of data from the buffer
+	 */
+	void ReadSome(std::uint8_t* buffer, std::size_t amount) {
+		assert(m_ReadOffset + amount <= GetSize());
+		std::copy_n(m_Buffer.begin() + static_cast<difference_type>(m_ReadOffset), amount, buffer);
+		m_ReadOffset += amount;
+	}
+
+	/**
+	 * \brief Read some data from the buffer
+	 * \param buffer The buffer to Read
+	 * \param amount The amount of data from the buffer
+	 */
+	void ReadSome(DataBuffer& buffer, std::size_t amount) {
+		assert(m_ReadOffset + amount <= GetSize());
+		buffer.Resize(amount);
+		std::copy_n(m_Buffer.begin() + static_cast<difference_type>(m_ReadOffset), amount, buffer.begin());
+		m_ReadOffset += amount;
+	}
+
+	/**
+	 * \brief Resize the buffer
+	 * \param size The new size of the buffer
+	 */
+	void Resize(std::size_t size) {
+		m_Buffer.resize(size);
+	}
+
+	/**
+	 * \brief Reserve some space in the buffer
+	 * \param amount The amount of space to reserve
+	 */
+	void Reserve(std::size_t amount) {
+		m_Buffer.reserve(amount);
+	}
+
+
+	/**
+	 * \brief Clear the buffer
+	 */
+	void Clear() {
+		m_Buffer.clear();
+		m_ReadOffset = 0;
+	}
+
+	/**
+	 * \brief When the buffer has been read entirely
+	 */
+	bool IsFinished() const {
+		return m_ReadOffset >= m_Buffer.size();
+	}
+
+	/**
+	 * \brief Get the buffer data
+	 */
+	std::uint8_t* data() {
+		return m_Buffer.data();
+	}
+
+	/**
+	 * \brief Get the buffer data
+	 */
+	const std::uint8_t* data() const {
+		return m_Buffer.data();
+	}
+
+	/**
+	 * \brief Get the read offset
+	 */
+	std::size_t GetReadOffset() const {
+		return m_ReadOffset;
+	}
+
+	/**
+	 * \brief Set the read offset
+	 * \param pos The new read offset
+	 */
+	void SetReadOffset(std::size_t pos);
+
+	/**
+	 * \brief Get the size of the buffer
+	 */
+	std::size_t GetSize() const;
+
+	/**
+	 * \brief Get the remaining size of the buffer
+	 */
+	std::size_t GetRemaining() const;
+
+	/**
+	 * \brief Read a file into the buffer
+	 * \param fileName The name of the file to read
+	 */
+	bool ReadFile(const std::string& fileName);
+
+	/**
+	 * \brief Write a file into the buffer
+	 * \param fileName The name of the file to write to
+	 */
+	bool WriteFile(const std::string& fileName) const;
+
+	/**
+	 * \brief Allocate the buffer on the heap
+	 * \warning Don't forget to free the data !
+	 */
+	std::uint8_t* HeapAllocatedData() const {
+		std::uint8_t* newBuffer = new std::uint8_t[GetSize()];
+		std::memcpy(newBuffer, data(), GetSize());
+		return newBuffer;
+	}
+
+	/**
+	 * \brief Operator == to compare two DataBuffer
+	 */
+	bool operator==(const DataBuffer& other) const {
+		return m_Buffer == other.m_Buffer;
+	}
+
+	iterator begin();
+	iterator end();
+	const_iterator begin() const;
+	const_iterator end() const;
+};
+
+/**
+ * \brief Operator << to write a DataBuffer to an ostream
+ */
+std::ostream& operator<<(std::ostream& os, const DataBuffer& buffer);
+

src/Common/VarInt.cpp

@@ -0,0 +1,48 @@
+#include "VarInt.h"
+
+#include "DataBuffer.h"
+#include <stdexcept>
+
+static constexpr int SEGMENT_BITS = 0x7F;
+static constexpr int CONTINUE_BIT = 0x80;
+
+std::size_t VarInt::GetSerializedLength() const {
+	DataBuffer buffer;
+	buffer << *this;
+	return buffer.GetSize();
+}
+
+DataBuffer& operator<<(DataBuffer& out, const VarInt& var) {
+	std::uint64_t value = var.m_Value;
+	while (true) {
+		if ((value & ~static_cast<std::uint64_t>(SEGMENT_BITS)) == 0) {
+			out << static_cast<std::uint8_t>(value);
+			return out;
+		}
+
+		out << static_cast<std::uint8_t>((value & SEGMENT_BITS) | CONTINUE_BIT);
+
+		value >>= 7;
+	}
+}
+
+DataBuffer& operator>>(DataBuffer& in, VarInt& var) {
+	var.m_Value = 0;
+	unsigned int position = 0;
+	std::uint8_t currentByte;
+
+	while (true) {
+		in.ReadSome(&currentByte, 1);
+		var.m_Value |= static_cast<std::uint64_t>(currentByte & SEGMENT_BITS) << position;
+
+		if ((currentByte & CONTINUE_BIT) == 0)
+			break;
+
+		position += 7;
+
+		if (position >= 8 * sizeof(var.m_Value))
+			throw std::runtime_error("VarInt is too big");
+	}
+
+	return in;
+}

src/Common/VarInt.h

@@ -0,0 +1,54 @@
+#pragma once
+
+/**
+ * \file VarInt.h
+ * \brief File containing the blitz::VarInt class
+ */
+
+#include <cstddef>
+#include <cstdint>
+
+class DataBuffer;
+
+/**
+ * \class VarInt
+ * \brief Variable-length format such that smaller numbers use fewer bytes.
+ */
+class VarInt {
+  private:
+	std::uint64_t m_Value;
+
+  public:
+	VarInt() : m_Value(0) {}
+	/**
+	 * \brief Construct a variable integer from a value
+	 * \param value The value of the variable integer
+	 */
+	VarInt(std::uint64_t value) : m_Value(value) {}
+
+	/**
+	 * \brief Get the value of the variable integer
+	 */
+	std::uint64_t GetValue() const {
+		return m_Value;
+	}
+
+	/**
+	 * \brief Get the length of the serialized variable integer
+	 */
+	std::size_t GetSerializedLength() const;
+
+	/**
+	 * \brief Serialize the variable integer
+	 * \param out The buffer to write the serialized variable integer to
+	 * \param var The variable integer to serialize
+	 */
+	friend DataBuffer& operator<<(DataBuffer& out, const VarInt& var);
+
+	/**
+	 * \brief Deserialize the variable integer
+	 * \param in The buffer to read the serialized variable integer from
+	 * \param var The variable integer to deserialize
+	 */
+	friend DataBuffer& operator>>(DataBuffer& in, VarInt& var);
+};

src/Pieces/PiecesFiles.cpp

@@ -10,6 +10,8 @@
 #include <filesystem>
 #include <algorithm>
 
+#include "../Common/Compression.h"
+
 
 PiecesFiles::PiecesFiles() {
 }
@@ -19,10 +21,6 @@ bool PiecesFiles::savePieces(int polyominoSize) const {
     if (!this->getFilePath(polyominoSize, filePath)) {
         return false;
     }
-    std::ofstream piecesFile(filePath, std::ios::trunc | std::ios::binary);
-    if (!piecesFile.good()) {
-        return false;
-    }
 
     Generator generator;
     std::vector<Polyomino> polyominoes = generator.generatePolyominoes(polyominoSize);
@@ -35,10 +33,9 @@ bool PiecesFiles::savePieces(int polyominoSize, std::vector<Polyomino>& polyomin
     if (!this->getFilePath(polyominoSize, filePath)) {
         return false;
     }
-    std::ofstream piecesFile(filePath, std::ios::trunc | std::ios::binary);
-    if (!piecesFile.good()) {
-        return false;
-    }
+
+    constexpr std::size_t INITIAL_CAPACITY = 2048;
+    DataBuffer buffer(INITIAL_CAPACITY);
 
     // sorting the polyominoes is done after setting spawn position to ensure the order is always the same
     for (Polyomino& nMino : polyominoes) {
@@ -50,18 +47,20 @@ bool PiecesFiles::savePieces(int polyominoSize, std::vector<Polyomino>& polyomin
         // write the characteristics of the piece
         bool isConvex = polyomino.isConvex();
         bool hasHole = (isConvex) ? false : polyomino.hasHole();
-        char infoByte = (isConvex << 7) + (hasHole << 6) + polyomino.getLength();
-        piecesFile.write(&infoByte, 1);
+        std::uint8_t infoByte = (isConvex << 7) + (hasHole << 6) + polyomino.getLength();
+        buffer << infoByte;
 
         // write the positions of the piece
-        char positionByte;
+        std::uint8_t positionByte;
         for (const Position position : polyomino.getPositions()) {
             positionByte = (position.x << 4) + position.y;
-            piecesFile.write(&positionByte, 1);
+            buffer << positionByte;
         }
     }
 
-    return true;
+    DataBuffer compressed = Compress(buffer);
+
+    return compressed.WriteFile(filePath);
 }
 
 bool PiecesFiles::loadPieces(int polyominoSize, std::vector<Piece>& pieces, std::vector<int>& convexPieces, std::vector<int>& holelessPieces, std::vector<int>& otherPieces) const {
@@ -69,6 +68,13 @@ bool PiecesFiles::loadPieces(int polyominoSize, std::vector<Piece>& pieces, std:
     if (!this->getFilePath(polyominoSize, filePath)) {
         return false;
     }
+
+    DataBuffer compressed;
+    if(!compressed.ReadFile(filePath))
+        return false;
+
+    DataBuffer buffer = Decompress(compressed, compressed.GetSize());
+        
     std::ifstream piecesFile(filePath, std::ios::binary);
     if (!piecesFile.good()) {
         return false;
@@ -91,10 +97,11 @@ bool PiecesFiles::loadPieces(int polyominoSize, std::vector<Piece>& pieces, std:
     char xMask = 0b1111'0000;
     char yMask = 0b0000'1111;
 
-    char infoByte;
+    std::uint8_t infoByte;
     int i = 0;
-    while (piecesFile.get(infoByte)) {
-        if (piecesFile.eof()) break;
+    while (!buffer.IsFinished()) {
+        // if (piecesFile.eof()) break;
+        buffer >> infoByte;
 
         // read piece infos
         bool isConvex = (infoByte & convexMask) >> 7;
@@ -103,9 +110,9 @@ bool PiecesFiles::loadPieces(int polyominoSize, std::vector<Piece>& pieces, std:
 
         // read positions
         std::set<Position> piecePositions;
-        char positionByte;
+        std::uint8_t positionByte;
         for (int i = 0; i < polyominoSize; i++) {
-            piecesFile.get(positionByte);
+            buffer >> positionByte;
             int x = ((unsigned char) positionByte & xMask) >> 4;
             int y = positionByte & yMask;
             piecePositions.insert(Position{x, y});

xmake.lua

@@ -2,7 +2,7 @@ add_rules("mode.debug", "mode.release")
 
 includes("xmake/bin2c.lua")
 
-add_requires("sfml 3.0.0")
+add_requires("sfml 3.0.0", "zlib")
 
 set_languages("c++20")
 
@@ -10,8 +10,8 @@ set_rundir(".")
 
 target("core")
     set_kind("$(kind)")
-    add_files("src/Pieces/*.cpp")
-    add_files("src/Core/*.cpp")
+    add_files("src/Pieces/*.cpp", "src/Core/*.cpp", "src/Common/*.cpp")
+    add_packages("zlib")
 
 target("text")
     set_default(false)