966 lines
40 KiB
C++
966 lines
40 KiB
C++
#pragma once
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#include <hex.hpp>
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#include <imgui.h>
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#include <implot.h>
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#include <hex/api/imhex_api.hpp>
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#include <hex/api/localization_manager.hpp>
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#include <hex/providers/provider.hpp>
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#include <hex/providers/buffered_reader.hpp>
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#include <imgui_internal.h>
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#include <random>
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namespace hex {
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namespace impl {
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inline int IntegerAxisFormatter(double value, char* buffer, int size, void *userData) {
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u64 integer = static_cast<u64>(value);
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return snprintf(buffer, size, static_cast<const char*>(userData), integer);
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}
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inline std::vector<u8> getSampleSelection(prv::Provider *provider, u64 address, size_t size, size_t sampleSize) {
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const size_t sequenceCount = std::ceil(std::sqrt(sampleSize));
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std::vector<u8> buffer;
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if (size < sampleSize) {
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buffer.resize(size);
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provider->read(address, buffer.data(), size);
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} else {
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std::random_device randomDevice;
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std::mt19937_64 random(randomDevice());
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std::map<u64, std::vector<u8>> orderedData;
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for (u32 i = 0; i < sequenceCount; i++) {
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ssize_t offset = random() % size;
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std::vector<u8> sequence;
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sequence.resize(std::min<size_t>(sequenceCount, size - offset));
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provider->read(address + offset, sequence.data(), sequence.size());
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orderedData.insert({ offset, sequence });
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}
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buffer.reserve(sampleSize);
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u64 lastEnd = 0x00;
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for (const auto &[offset, sequence] : orderedData) {
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if (offset < lastEnd)
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buffer.resize(buffer.size() - (lastEnd - offset));
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std::copy(sequence.begin(), sequence.end(), std::back_inserter(buffer));
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lastEnd = offset + sequence.size();
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}
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}
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return buffer;
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}
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inline std::vector<u8> getSampleSelection(const std::vector<u8> &inputBuffer, size_t sampleSize) {
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const size_t sequenceCount = std::ceil(std::sqrt(sampleSize));
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std::vector<u8> buffer;
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if (inputBuffer.size() < sampleSize) {
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buffer = inputBuffer;
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} else {
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std::random_device randomDevice;
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std::mt19937_64 random(randomDevice());
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std::map<u64, std::vector<u8>> orderedData;
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for (u32 i = 0; i < sequenceCount; i++) {
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ssize_t offset = random() % inputBuffer.size();
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std::vector<u8> sequence;
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sequence.reserve(sampleSize);
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std::copy_n(inputBuffer.begin() + offset, std::min<size_t>(sequenceCount, inputBuffer.size() - offset), std::back_inserter(sequence));
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orderedData.insert({ offset, sequence });
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}
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buffer.reserve(sampleSize);
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u64 lastEnd = 0x00;
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for (const auto &[offset, sequence] : orderedData) {
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if (offset < lastEnd)
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buffer.resize(buffer.size() - (lastEnd - offset));
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std::copy(sequence.begin(), sequence.end(), std::back_inserter(buffer));
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lastEnd = offset + sequence.size();
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}
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}
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return buffer;
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}
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}
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class DiagramDigram {
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public:
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explicit DiagramDigram(size_t sampleSize = 0x9000) : m_sampleSize(sampleSize) { }
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void draw(ImVec2 size) {
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ImGui::PushStyleColor(ImGuiCol_ChildBg, ImU32(ImColor(0, 0, 0)));
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if (ImGui::BeginChild("##digram", size, true)) {
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auto drawList = ImGui::GetWindowDrawList();
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float xStep = (size.x * 0.95F) / 0xFF;
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float yStep = (size.y * 0.95F) / 0xFF;
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if (!this->m_processing)
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for (size_t i = 0; i < (this->m_buffer.empty() ? 0 : this->m_buffer.size() - 1); i++) {
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auto x = this->m_buffer[i] * xStep;
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auto y = this->m_buffer[i + 1] * yStep;
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auto color = ImLerp(ImColor(0xFF, 0x6D, 0x01).Value, ImColor(0x01, 0x93, 0xFF).Value, float(i) / this->m_buffer.size()) + ImVec4(this->m_glowBuffer[i], this->m_glowBuffer[i], this->m_glowBuffer[i], 0.0F);
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color.w = this->m_opacity;
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auto pos = ImGui::GetWindowPos() + ImVec2(size.x * 0.025F, size.y * 0.025F) + ImVec2(x, y);
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drawList->AddRectFilled(pos, pos + ImVec2(xStep, yStep), ImColor(color));
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}
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}
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ImGui::EndChild();
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ImGui::PopStyleColor();
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}
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void process(prv::Provider *provider, u64 address, size_t size) {
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this->m_processing = true;
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this->m_buffer = impl::getSampleSelection(provider, address, size, this->m_sampleSize);
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processImpl();
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this->m_processing = false;
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}
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void process(const std::vector<u8> &buffer) {
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this->m_processing = true;
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this->m_buffer = impl::getSampleSelection(buffer, this->m_sampleSize);
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processImpl();
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this->m_processing = false;
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}
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void reset(u64 size) {
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this->m_processing = true;
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this->m_buffer.clear();
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this->m_buffer.reserve(this->m_sampleSize);
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this->m_byteCount = 0;
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this->m_fileSize = size;
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}
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void update(u8 byte) {
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// Check if there is some space left
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if (this->m_byteCount < this->m_fileSize) {
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if ((this->m_byteCount % u64(std::ceil(double(this->m_fileSize) / double(this->m_sampleSize)))) == 0)
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this->m_buffer.push_back(byte);
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++this->m_byteCount;
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if (this->m_byteCount == this->m_fileSize) {
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processImpl();
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this->m_processing = false;
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}
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}
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}
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private:
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void processImpl() {
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this->m_glowBuffer.resize(this->m_buffer.size());
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std::map<u64, size_t> heatMap;
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for (size_t i = 0; i < (this->m_buffer.empty() ? 0 : this->m_buffer.size() - 1); i++) {
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auto count = ++heatMap[this->m_buffer[i] << 8 | heatMap[i + 1]];
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this->m_highestCount = std::max(this->m_highestCount, count);
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}
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for (size_t i = 0; i < (this->m_buffer.empty() ? 0 : this->m_buffer.size() - 1); i++) {
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this->m_glowBuffer[i] = std::min<float>(0.2F + (float(heatMap[this->m_buffer[i] << 8 | this->m_buffer[i + 1]]) / float(this->m_highestCount / 1000)), 1.0F);
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}
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this->m_opacity = (log10(float(this->m_sampleSize)) / log10(float(m_highestCount))) / 10.0F;
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}
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private:
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size_t m_sampleSize = 0;
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// The number of bytes processed and the size of
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// the file to analyze (useful for iterative analysis)
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u64 m_byteCount = 0;
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u64 m_fileSize = 0;
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std::vector<u8> m_buffer;
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std::vector<float> m_glowBuffer;
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float m_opacity = 0.0F;
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size_t m_highestCount = 0;
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std::atomic<bool> m_processing = false;
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};
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class DiagramLayeredDistribution {
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public:
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explicit DiagramLayeredDistribution(size_t sampleSize = 0x9000) : m_sampleSize(sampleSize) { }
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void draw(ImVec2 size) {
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ImGui::PushStyleColor(ImGuiCol_ChildBg, ImU32(ImColor(0, 0, 0)));
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if (ImGui::BeginChild("##layered_distribution", size, true)) {
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auto drawList = ImGui::GetWindowDrawList();
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float xStep = (size.x * 0.95F) / 0xFF;
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float yStep = (size.y * 0.95F) / 0xFF;
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if (!this->m_processing)
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for (size_t i = 0; i < (this->m_buffer.empty() ? 0 : this->m_buffer.size()); i++) {
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auto x = this->m_buffer[i] * xStep;
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auto y = yStep * ((float(i) / this->m_buffer.size()) * 0xFF);
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auto color = ImLerp(ImColor(0xFF, 0x6D, 0x01).Value, ImColor(0x01, 0x93, 0xFF).Value, float(i) / this->m_buffer.size()) + ImVec4(this->m_glowBuffer[i], this->m_glowBuffer[i], this->m_glowBuffer[i], 0.0F);
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color.w = this->m_opacity;
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auto pos = ImGui::GetWindowPos() + ImVec2(size.x * 0.025F, size.y * 0.025F) + ImVec2(x, y);
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drawList->AddRectFilled(pos, pos + ImVec2(xStep, yStep), ImColor(color));
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}
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}
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ImGui::EndChild();
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ImGui::PopStyleColor();
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}
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void process(prv::Provider *provider, u64 address, size_t size) {
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this->m_processing = true;
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this->m_buffer = impl::getSampleSelection(provider, address, size, this->m_sampleSize);
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processImpl();
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this->m_processing = false;
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}
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void process(const std::vector<u8> &buffer) {
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this->m_processing = true;
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this->m_buffer = impl::getSampleSelection(buffer, this->m_sampleSize);
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processImpl();
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this->m_processing = false;
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}
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void reset(u64 size) {
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this->m_processing = true;
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this->m_buffer.clear();
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this->m_buffer.reserve(this->m_sampleSize);
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this->m_byteCount = 0;
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this->m_fileSize = size;
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}
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void update(u8 byte) {
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// Check if there is some space left
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if (this->m_byteCount < this->m_fileSize) {
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if ((this->m_byteCount % u64(std::ceil(double(this->m_fileSize) / double(this->m_sampleSize)))) == 0)
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this->m_buffer.push_back(byte);
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++this->m_byteCount;
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if (this->m_byteCount == this->m_fileSize) {
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processImpl();
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this->m_processing = false;
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}
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}
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}
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private:
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void processImpl() {
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this->m_glowBuffer.resize(this->m_buffer.size());
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std::map<u64, size_t> heatMap;
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for (size_t i = 0; i < (this->m_buffer.empty() ? 0 : this->m_buffer.size() - 1); i++) {
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auto count = ++heatMap[this->m_buffer[i] << 8 | heatMap[i + 1]];
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this->m_highestCount = std::max(this->m_highestCount, count);
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}
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for (size_t i = 0; i < (this->m_buffer.empty() ? 0 : this->m_buffer.size() - 1); i++) {
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this->m_glowBuffer[i] = std::min<float>(0.2F + (float(heatMap[this->m_buffer[i] << 8 | this->m_buffer[i + 1]]) / float(this->m_highestCount / 1000)), 1.0F);
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}
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this->m_opacity = (log10(float(this->m_sampleSize)) / log10(float(m_highestCount))) / 10.0F;
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}
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private:
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size_t m_sampleSize = 0;
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// The number of bytes processed and the size of
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// the file to analyze (useful for iterative analysis)
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u64 m_byteCount = 0;
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u64 m_fileSize = 0;
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std::vector<u8> m_buffer;
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std::vector<float> m_glowBuffer;
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float m_opacity = 0.0F;
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size_t m_highestCount = 0;
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std::atomic<bool> m_processing = false;
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};
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class DiagramChunkBasedEntropyAnalysis {
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public:
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explicit DiagramChunkBasedEntropyAnalysis(u64 blockSize = 256, size_t sampleSize = 0x1000) : m_blockSize(blockSize), m_sampleSize(sampleSize) { }
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void draw(ImVec2 size, ImPlotFlags flags, bool updateHandle = false) {
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if (!this->m_processing && ImPlot::BeginPlot("##ChunkBasedAnalysis", size, flags)) {
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ImPlot::SetupAxes("hex.builtin.common.address"_lang, "hex.builtin.view.information.entropy"_lang,
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ImPlotAxisFlags_Lock | ImPlotAxisFlags_NoHighlight | ImPlotAxisFlags_NoSideSwitch,
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ImPlotAxisFlags_Lock | ImPlotAxisFlags_NoHighlight | ImPlotAxisFlags_NoSideSwitch);
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ImPlot::SetupAxisFormat(ImAxis_X1, impl::IntegerAxisFormatter, (void*)("0x%04llX"));
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ImPlot::SetupMouseText(ImPlotLocation_NorthEast);
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// Set the axis limit to [first block : last block]
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ImPlot::SetupAxesLimits(
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this->m_xBlockEntropy.empty() ? 0 : this->m_xBlockEntropy.front(),
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this->m_xBlockEntropy.empty() ? 0 : this->m_xBlockEntropy.back(),
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-0.1F,
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1.1F,
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ImGuiCond_Always);
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// Draw the plot
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ImPlot::PlotLine("##ChunkBasedAnalysisLine", this->m_xBlockEntropy.data(), this->m_yBlockEntropySampled.data(), this->m_xBlockEntropy.size());
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// The parameter updateHandle is used when using the pattern language since we don't have a provider
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// but just a set of bytes, we won't be able to use the drag bar correctly.
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if (updateHandle) {
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// Set a draggable line on the plot
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if (ImPlot::DragLineX(1, &this->m_handlePosition, ImGui::GetStyleColorVec4(ImGuiCol_Text))) {
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// The line was dragged, update the position in the hex editor
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// Clamp the value between the start/end of the region to analyze
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this->m_handlePosition = std::clamp<double>(
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this->m_handlePosition,
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this->m_startAddress,
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this->m_endAddress);
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// Compute the position inside hex editor
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u64 address = u64(std::max<double>(this->m_handlePosition, 0)) + this->m_baseAddress;
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address = std::min<u64>(address, this->m_baseAddress + this->m_fileSize - 1);
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ImHexApi::HexEditor::setSelection(address, 1);
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}
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}
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ImPlot::EndPlot();
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}
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}
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void process(prv::Provider *provider, u64 chunkSize, u64 startAddress, u64 endAddress) {
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this->m_processing = true;
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// Update attributes
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this->m_chunkSize = chunkSize;
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this->m_startAddress = startAddress;
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this->m_endAddress = endAddress;
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this->m_baseAddress = provider->getBaseAddress();
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this->m_fileSize = provider->getSize();
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// Get a file reader
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auto reader = prv::ProviderReader(provider);
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std::vector<u8> bytes = reader.read(this->m_startAddress, this->m_endAddress - this->m_startAddress);
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this->processImpl(bytes);
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// Set the diagram handle position to the start of the plot
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this->m_handlePosition = this->m_startAddress;
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this->m_processing = false;
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}
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void process(const std::vector<u8> &buffer, u64 chunkSize) {
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this->m_processing = true;
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// Update attributes (use buffer size as end address)
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this->m_chunkSize = chunkSize;
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this->m_startAddress = 0;
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this->m_endAddress = buffer.size();
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this->m_baseAddress = 0;
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this->m_fileSize = buffer.size();
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this->processImpl(buffer);
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// Set the diagram handle position to the start of the plot
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this->m_handlePosition = this->m_startAddress;
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this->m_processing = false;
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}
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// Reset the entropy analysis
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void reset(u64 chunkSize, u64 startAddress, u64 endAddress, u64 baseAddress, u64 size) {
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this->m_processing = true;
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// Update attributes
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this->m_chunkSize = chunkSize;
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this->m_startAddress = startAddress;
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this->m_endAddress = endAddress;
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this->m_baseAddress = baseAddress;
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this->m_fileSize = size;
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this->m_blockValueCounts = { 0 };
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// Reset and resize the array
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this->m_yBlockEntropy.clear();
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this->m_byteCount = 0;
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this->m_blockCount = 0;
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// Set the diagram handle position to the start of the plot
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this->m_handlePosition = this->m_startAddress;
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}
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// Process one byte at the time
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void update(u8 byte) {
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u64 totalBlock = std::ceil((this->m_endAddress - this->m_startAddress) / this->m_chunkSize);
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// Check if there is still some
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if (this->m_blockCount < totalBlock) {
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// Increment the occurrence of the current byte
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this->m_blockValueCounts[byte]++;
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this->m_byteCount++;
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// Check if we processed one complete chunk, if so compute the entropy and start analysing the next chunk
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if (((this->m_byteCount % this->m_chunkSize) == 0) || this->m_byteCount == (this->m_endAddress - this->m_startAddress)) [[unlikely]] {
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this->m_yBlockEntropy.push_back(calculateEntropy(this->m_blockValueCounts, this->m_chunkSize));
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this->m_blockCount += 1;
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this->m_blockValueCounts = { 0 };
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}
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// Check if we processed the last block, if so setup the X axis part of the data
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if (this->m_blockCount == totalBlock) {
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processFinalize();
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this->m_processing = false;
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}
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}
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}
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// Method used to compute the entropy of a block of size `blockSize`
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// using the byte occurrences from `valueCounts` array.
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double calculateEntropy(const std::array<ImU64, 256> &valueCounts, size_t blockSize) const {
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double entropy = 0;
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u8 processedValueCount = 0;
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for (const auto count : valueCounts) {
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if (count == 0) [[unlikely]]
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continue;
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processedValueCount += 1;
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double probability = static_cast<double>(count) / blockSize;
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entropy += probability * std::log2(probability);
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}
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if (processedValueCount == 1)
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return 0.0;
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return std::min<double>(1.0, (-entropy) / 8); // log2(256) = 8
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}
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// Return the highest entropy value among all of the blocks
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double getHighestEntropyBlockValue() {
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double result = 0.0f;
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if (!this->m_yBlockEntropy.empty())
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result = *std::max_element(this->m_yBlockEntropy.begin(), this->m_yBlockEntropy.end());
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return result;
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}
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// Return the highest entropy value among all of the blocks
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u64 getHighestEntropyBlockAddress() {
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u64 address = 0x00;
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if (!this->m_yBlockEntropy.empty())
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address = (std::max_element(this->m_yBlockEntropy.begin(), this->m_yBlockEntropy.end()) - this->m_yBlockEntropy.begin()) * this->m_blockSize;
|
|
return this->m_startAddress + address;
|
|
}
|
|
|
|
// Return the highest entropy value among all of the blocks
|
|
double getLowestEntropyBlockValue() {
|
|
double result = 0.0f;
|
|
if (this->m_yBlockEntropy.size() > 1)
|
|
result = *std::min_element(this->m_yBlockEntropy.begin(), this->m_yBlockEntropy.end() - 1);
|
|
return result;
|
|
}
|
|
|
|
// Return the highest entropy value among all of the blocks
|
|
u64 getLowestEntropyBlockAddress() {
|
|
u64 address = 0x00;
|
|
if (this->m_yBlockEntropy.size() > 1)
|
|
address = (std::min_element(this->m_yBlockEntropy.begin(), this->m_yBlockEntropy.end() - 1) - this->m_yBlockEntropy.begin()) * this->m_blockSize;
|
|
return this->m_startAddress + address;
|
|
}
|
|
|
|
// Return the number of blocks that have been processed
|
|
u64 getSize() const {
|
|
return this->m_yBlockEntropySampled.size();
|
|
}
|
|
|
|
// Return the size of the chunk used for this analysis
|
|
u64 getChunkSize() const {
|
|
return this->m_chunkSize;
|
|
}
|
|
|
|
void setHandlePosition(u64 filePosition) {
|
|
this->m_handlePosition = filePosition;
|
|
}
|
|
|
|
private:
|
|
// Private method used to factorize the process public method
|
|
void processImpl(const std::vector<u8> &bytes) {
|
|
this->m_blockValueCounts = { 0 };
|
|
|
|
// Reset and resize the array
|
|
this->m_yBlockEntropy.clear();
|
|
|
|
this->m_byteCount = 0;
|
|
this->m_blockCount = 0;
|
|
|
|
// Loop over each byte of the file (or a part of it)
|
|
for (u8 byte: bytes) {
|
|
// Increment the occurrence of the current byte
|
|
this->m_blockValueCounts[byte]++;
|
|
|
|
this->m_byteCount++;
|
|
// Check if we processed one complete chunk, if so compute the entropy and start analysing the next chunk
|
|
if (((this->m_byteCount % this->m_chunkSize) == 0) || this->m_byteCount == bytes.size() * 8) [[unlikely]] {
|
|
this->m_yBlockEntropy.push_back(calculateEntropy(this->m_blockValueCounts, this->m_chunkSize));
|
|
|
|
this->m_blockCount += 1;
|
|
this->m_blockValueCounts = { 0 };
|
|
}
|
|
}
|
|
processFinalize();
|
|
}
|
|
|
|
void processFinalize() {
|
|
// Only save at most m_sampleSize elements of the result
|
|
this->m_yBlockEntropySampled = sampleData(this->m_yBlockEntropy, std::min<size_t>(this->m_blockCount + 1, this->m_sampleSize));
|
|
|
|
if (!this->m_yBlockEntropySampled.empty())
|
|
this->m_yBlockEntropySampled.push_back(this->m_yBlockEntropySampled.back());
|
|
|
|
double stride = std::max(1.0, double(
|
|
double(std::ceil((this->m_endAddress - this->m_startAddress)) / this->m_blockSize) / this->m_yBlockEntropySampled.size()));
|
|
|
|
this->m_blockCount = this->m_yBlockEntropySampled.size() - 1;
|
|
|
|
// The m_xBlockEntropy attribute is used to specify the position of entropy values
|
|
// in the plot when the Y axis doesn't start at 0
|
|
this->m_xBlockEntropy.clear();
|
|
this->m_xBlockEntropy.resize(this->m_blockCount);
|
|
for (u64 i = 0; i < this->m_blockCount; ++i)
|
|
this->m_xBlockEntropy[i] = ((this->m_startAddress / this->m_blockSize) + stride * i) * this->m_blockSize;
|
|
this->m_xBlockEntropy.push_back(this->m_endAddress);
|
|
}
|
|
|
|
private:
|
|
// Variables used to store the parameters to process
|
|
|
|
// Chunk's size for entropy analysis
|
|
u64 m_chunkSize = 0;
|
|
u64 m_startAddress = 0x00;
|
|
u64 m_endAddress = 0x00;
|
|
// Start / size of the file
|
|
u64 m_baseAddress = 0x00;
|
|
u64 m_fileSize = 0;
|
|
// The size of the blocks (for diagram drawing)
|
|
u64 m_blockSize = 0;
|
|
|
|
// Position of the handle inside the plot
|
|
double m_handlePosition = 0.0;
|
|
|
|
// Hold the number of blocks that have been processed
|
|
// during the chunk-based entropy analysis
|
|
u64 m_blockCount = 0;
|
|
|
|
// Hold the number of bytes that have been processed
|
|
// during the analysis (useful for the iterative analysis)
|
|
u64 m_byteCount = 0;
|
|
|
|
// Array used to hold the occurrences of each byte
|
|
// (useful for the iterative analysis)
|
|
std::array<ImU64, 256> m_blockValueCounts = {};
|
|
|
|
// Variable to hold the result of the chunk-based
|
|
// entropy analysis
|
|
std::vector<double> m_xBlockEntropy;
|
|
std::vector<double> m_yBlockEntropy, m_yBlockEntropySampled;
|
|
|
|
// Sampling size, number of elements displayed in the plot,
|
|
// avoid showing to many data because it decreased the frame rate
|
|
size_t m_sampleSize = 0;
|
|
|
|
std::atomic<bool> m_processing = false;
|
|
};
|
|
|
|
class DiagramByteDistribution {
|
|
public:
|
|
DiagramByteDistribution() = default;
|
|
|
|
void draw(ImVec2 size, ImPlotFlags flags) {
|
|
|
|
if (!this->m_processing && ImPlot::BeginPlot("##distribution", size, flags)) {
|
|
ImPlot::SetupAxes("hex.builtin.common.value"_lang, "hex.builtin.common.count"_lang,
|
|
ImPlotAxisFlags_Lock | ImPlotAxisFlags_NoHighlight | ImPlotAxisFlags_NoSideSwitch,
|
|
ImPlotAxisFlags_Lock | ImPlotAxisFlags_NoHighlight | ImPlotAxisFlags_NoSideSwitch);
|
|
ImPlot::SetupAxisScale(ImAxis_Y1, ImPlotScale_Log10);
|
|
ImPlot::SetupAxesLimits(-1, 256, 1, double(*std::max_element(this->m_valueCounts.begin(), this->m_valueCounts.end())) * 1.1F, ImGuiCond_Always);
|
|
ImPlot::SetupAxisFormat(ImAxis_X1, impl::IntegerAxisFormatter, (void*)("0x%02llX"));
|
|
ImPlot::SetupAxisTicks(ImAxis_X1, 0, 255, 17);
|
|
ImPlot::SetupMouseText(ImPlotLocation_NorthEast);
|
|
|
|
constexpr static auto x = [] {
|
|
std::array<ImU64, 256> result { 0 };
|
|
std::iota(result.begin(), result.end(), 0);
|
|
return result;
|
|
}();
|
|
|
|
ImPlot::PlotBars<ImU64>("##bytes", x.data(), this->m_valueCounts.data(), x.size(), 1);
|
|
ImPlot::EndPlot();
|
|
}
|
|
}
|
|
|
|
void process(prv::Provider *provider, u64 startAddress, u64 endAddress) {
|
|
this->m_processing = true;
|
|
|
|
// Update attributes
|
|
this->m_startAddress = startAddress;
|
|
this->m_endAddress = endAddress;
|
|
|
|
// Get a file reader
|
|
auto reader = prv::ProviderReader(provider);
|
|
std::vector<u8> bytes = reader.read(this->m_startAddress, this->m_endAddress - this->m_startAddress);
|
|
|
|
this->processImpl(bytes);
|
|
|
|
this->m_processing = false;
|
|
}
|
|
|
|
void process(const std::vector<u8> &buffer) {
|
|
this->m_processing = true;
|
|
|
|
// Update attributes
|
|
this->m_startAddress = 0;
|
|
this->m_endAddress = buffer.size();
|
|
|
|
this->processImpl(buffer);
|
|
|
|
this->m_processing = false;
|
|
}
|
|
|
|
// Reset the byte distribution array
|
|
void reset() {
|
|
this->m_processing = true;
|
|
this->m_valueCounts.fill(0);
|
|
this->m_processing = false;
|
|
}
|
|
|
|
// Process one byte at the time
|
|
void update(u8 byte) {
|
|
this->m_processing = true;
|
|
this->m_valueCounts[byte]++;
|
|
this->m_processing = false;
|
|
}
|
|
|
|
// Return byte distribution array in it's current state
|
|
std::array<ImU64, 256> & get() {
|
|
return this->m_valueCounts;
|
|
}
|
|
|
|
private:
|
|
// Private method used to factorize the process public method
|
|
void processImpl(const std::vector<u8> &bytes) {
|
|
// Reset the array
|
|
this->m_valueCounts.fill(0);
|
|
// Loop over each byte of the file (or a part of it)
|
|
// Increment the occurrence of the current byte
|
|
for (u8 byte : bytes)
|
|
this->m_valueCounts[byte]++;
|
|
}
|
|
|
|
private:
|
|
// Variables used to store the parameters to process
|
|
u64 m_startAddress = 0;
|
|
u64 m_endAddress = 0;
|
|
|
|
// Hold the result of the byte distribution analysis
|
|
std::array<ImU64, 256> m_valueCounts;
|
|
std::atomic<bool> m_processing = false;
|
|
};
|
|
|
|
class DiagramByteTypesDistribution {
|
|
public:
|
|
explicit DiagramByteTypesDistribution(u64 blockSize = 256, size_t sampleSize = 0x1000) : m_blockSize(blockSize), m_sampleSize(sampleSize){ }
|
|
|
|
void draw(ImVec2 size, ImPlotFlags flags, bool updateHandle = false) {
|
|
// Draw the result of the analysis
|
|
if (!this->m_processing && ImPlot::BeginPlot("##byte_types", size, flags)) {
|
|
ImPlot::SetupAxes("hex.builtin.common.address"_lang, "hex.builtin.common.percentage"_lang,
|
|
ImPlotAxisFlags_Lock | ImPlotAxisFlags_NoHighlight | ImPlotAxisFlags_NoSideSwitch,
|
|
ImPlotAxisFlags_Lock | ImPlotAxisFlags_NoHighlight | ImPlotAxisFlags_NoSideSwitch);
|
|
ImPlot::SetupAxesLimits(
|
|
this->m_xBlockTypeDistributions.empty() ? 0 : this->m_xBlockTypeDistributions.front(),
|
|
this->m_xBlockTypeDistributions.empty() ? 0 : this->m_xBlockTypeDistributions.back(),
|
|
-0.1F,
|
|
100.1F,
|
|
ImGuiCond_Always);
|
|
ImPlot::SetupLegend(ImPlotLocation_South, ImPlotLegendFlags_Horizontal | ImPlotLegendFlags_Outside);
|
|
ImPlot::SetupAxisFormat(ImAxis_X1, impl::IntegerAxisFormatter, (void*)("0x%04llX"));
|
|
ImPlot::SetupMouseText(ImPlotLocation_NorthEast);
|
|
|
|
constexpr static std::array Names = { "iscntrl", "isprint", "isspace", "isblank",
|
|
"isgraph", "ispunct", "isalnum", "isalpha",
|
|
"isupper", "islower", "isdigit", "isxdigit"
|
|
};
|
|
|
|
for (u32 i = 0; i < Names.size(); i++) {
|
|
ImPlot::PlotLine(Names[i], this->m_xBlockTypeDistributions.data(), this->m_yBlockTypeDistributionsSampled[i].data(), this->m_xBlockTypeDistributions.size());
|
|
}
|
|
|
|
// The parameter updateHandle is used when using the pattern language since we don't have a provider
|
|
// but just a set of bytes, we won't be able to use the drag bar correctly.
|
|
if (updateHandle) {
|
|
// Set a draggable line on the plot
|
|
if (ImPlot::DragLineX(1, &this->m_handlePosition, ImGui::GetStyleColorVec4(ImGuiCol_Text))) {
|
|
// The line was dragged, update the position in the hex editor
|
|
|
|
// Clamp the value between the start/end of the region to analyze
|
|
this->m_handlePosition = std::clamp<double>(
|
|
this->m_handlePosition,
|
|
this->m_startAddress,
|
|
this->m_endAddress);
|
|
|
|
// Compute the position inside hex editor
|
|
u64 address = u64(std::max<double>(this->m_handlePosition, 0)) + this->m_baseAddress;
|
|
address = std::min<u64>(address, this->m_baseAddress + this->m_fileSize - 1);
|
|
ImHexApi::HexEditor::setSelection(address, 1);
|
|
}
|
|
}
|
|
ImPlot::EndPlot();
|
|
}
|
|
}
|
|
|
|
void process(prv::Provider *provider, u64 startAddress, u64 endAddress) {
|
|
this->m_processing = true;
|
|
|
|
// Update attributes
|
|
this->m_startAddress = startAddress;
|
|
this->m_endAddress = endAddress;
|
|
this->m_baseAddress = provider->getBaseAddress();
|
|
this->m_fileSize = provider->getSize();
|
|
|
|
// Get a file reader
|
|
auto reader = prv::ProviderReader(provider);
|
|
std::vector<u8> bytes = reader.read(this->m_startAddress, this->m_endAddress - this->m_startAddress);
|
|
|
|
this->processImpl(bytes);
|
|
|
|
// Set the diagram handle position to the start of the plot
|
|
this->m_handlePosition = this->m_startAddress;
|
|
|
|
this->m_processing = false;
|
|
}
|
|
|
|
void process(const std::vector<u8> &buffer, u64 baseAddress, u64 fileSize) {
|
|
this->m_processing = true;
|
|
|
|
// Update attributes
|
|
this->m_startAddress = 0;
|
|
this->m_endAddress = buffer.size();
|
|
this->m_baseAddress = baseAddress;
|
|
this->m_fileSize = fileSize;
|
|
|
|
this->processImpl(buffer);
|
|
|
|
// Set the diagram handle position to the start of the plot
|
|
this->m_handlePosition = this->m_startAddress;
|
|
|
|
this->m_processing = false;
|
|
}
|
|
|
|
// Reset the byte type distribution analysis
|
|
void reset(u64 startAddress, u64 endAddress, u64 baseAddress, u64 size) {
|
|
this->m_processing = true;
|
|
|
|
// Update attributes
|
|
this->m_startAddress = startAddress;
|
|
this->m_endAddress = endAddress;
|
|
this->m_baseAddress = baseAddress;
|
|
this->m_fileSize = size;
|
|
|
|
this->m_byteCount = 0;
|
|
this->m_blockCount = 0;
|
|
this->m_blockValueCounts = { 0 };
|
|
|
|
// Reset and resize the array
|
|
this->m_yBlockTypeDistributions.fill({});
|
|
|
|
// Set the diagram handle position to the start of the plot
|
|
this->m_handlePosition = this->m_startAddress;
|
|
}
|
|
|
|
// Process one byte at the time
|
|
void update(u8 byte) {
|
|
u64 totalBlock = std::ceil((this->m_endAddress - this->m_startAddress) / this->m_blockSize);
|
|
// Check if there is still some block to process
|
|
if (this->m_blockCount < totalBlock) {
|
|
|
|
this->m_blockValueCounts[byte]++;
|
|
|
|
this->m_byteCount++;
|
|
if (((this->m_byteCount % this->m_blockSize) == 0) || this->m_byteCount == (this->m_endAddress - this->m_startAddress)) [[unlikely]] {
|
|
auto typeDist = calculateTypeDistribution(this->m_blockValueCounts, this->m_blockSize);
|
|
for (size_t i = 0; i < typeDist.size(); i++)
|
|
this->m_yBlockTypeDistributions[i].push_back(typeDist[i] * 100);
|
|
|
|
this->m_blockCount += 1;
|
|
this->m_blockValueCounts = { 0 };
|
|
}
|
|
|
|
// Check if we processed the last block, if so setup the X axis part of the data
|
|
if (this->m_blockCount == totalBlock) {
|
|
|
|
processFinalize();
|
|
this->m_processing = false;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Return the percentage of plain text character inside the analyzed region
|
|
double getPlainTextCharacterPercentage() {
|
|
if (this->m_yBlockTypeDistributions[2].empty() || this->m_yBlockTypeDistributions[4].empty())
|
|
return -1.0;
|
|
|
|
|
|
double plainTextPercentage = std::reduce(this->m_yBlockTypeDistributions[2].begin(), this->m_yBlockTypeDistributions[2].end()) / this->m_yBlockTypeDistributions[2].size();
|
|
return plainTextPercentage + std::reduce(this->m_yBlockTypeDistributions[4].begin(), this->m_yBlockTypeDistributions[4].end()) / this->m_yBlockTypeDistributions[4].size();
|
|
}
|
|
|
|
void setHandlePosition(u64 filePosition) {
|
|
this->m_handlePosition = filePosition;
|
|
}
|
|
|
|
private:
|
|
std::array<float, 12> calculateTypeDistribution(const std::array<ImU64, 256> &valueCounts, size_t blockSize) const {
|
|
std::array<ImU64, 12> counts = {};
|
|
|
|
for (u16 value = 0x00; value < u16(valueCounts.size()); value++) {
|
|
const auto &count = valueCounts[value];
|
|
|
|
if (count == 0) [[unlikely]]
|
|
continue;
|
|
|
|
if (std::iscntrl(value))
|
|
counts[0] += count;
|
|
if (std::isprint(value))
|
|
counts[1] += count;
|
|
if (std::isspace(value))
|
|
counts[2] += count;
|
|
if (std::isblank(value))
|
|
counts[3] += count;
|
|
if (std::isgraph(value))
|
|
counts[4] += count;
|
|
if (std::ispunct(value))
|
|
counts[5] += count;
|
|
if (std::isalnum(value))
|
|
counts[6] += count;
|
|
if (std::isalpha(value))
|
|
counts[7] += count;
|
|
if (std::isupper(value))
|
|
counts[8] += count;
|
|
if (std::islower(value))
|
|
counts[9] += count;
|
|
if (std::isdigit(value))
|
|
counts[10] += count;
|
|
if (std::isxdigit(value))
|
|
counts[11] += count;
|
|
}
|
|
|
|
std::array<float, 12> distribution = {};
|
|
for (u32 i = 0; i < distribution.size(); i++)
|
|
distribution[i] = static_cast<float>(counts[i]) / blockSize;
|
|
|
|
return distribution;
|
|
}
|
|
|
|
// Private method used to factorize the process public method
|
|
void processImpl(const std::vector<u8> &bytes) {
|
|
this->m_blockValueCounts = { 0 };
|
|
|
|
this->m_yBlockTypeDistributions.fill({});
|
|
this->m_byteCount = 0;
|
|
this->m_blockCount = 0;
|
|
|
|
// Loop over each byte of the file (or a part of it)
|
|
for (u8 byte : bytes) {
|
|
this->m_blockValueCounts[byte]++;
|
|
|
|
this->m_byteCount++;
|
|
if (((this->m_byteCount % this->m_blockSize) == 0) || this->m_byteCount == (this->m_endAddress - this->m_startAddress)) [[unlikely]] {
|
|
auto typeDist = calculateTypeDistribution(this->m_blockValueCounts, this->m_blockSize);
|
|
for (size_t i = 0; i < typeDist.size(); i++)
|
|
this->m_yBlockTypeDistributions[i].push_back(typeDist[i] * 100);
|
|
|
|
this->m_blockCount += 1;
|
|
this->m_blockValueCounts = { 0 };
|
|
}
|
|
}
|
|
|
|
processFinalize();
|
|
}
|
|
|
|
void processFinalize() {
|
|
// Only save at most m_sampleSize elements of the result
|
|
for (size_t i = 0; i < this->m_yBlockTypeDistributions.size(); ++i) {
|
|
this->m_yBlockTypeDistributionsSampled[i] = sampleData(this->m_yBlockTypeDistributions[i], std::min<size_t>(this->m_blockCount + 1, this->m_sampleSize));
|
|
|
|
if (!this->m_yBlockTypeDistributionsSampled[i].empty())
|
|
this->m_yBlockTypeDistributionsSampled[i].push_back(this->m_yBlockTypeDistributionsSampled[i].back());
|
|
}
|
|
|
|
double stride = std::max(1.0, double(this->m_blockCount) / this->m_yBlockTypeDistributionsSampled[0].size());
|
|
this->m_blockCount = this->m_yBlockTypeDistributionsSampled[0].size() - 1;
|
|
|
|
// The m_xBlockTypeDistributions attribute is used to specify the position of entropy
|
|
// values in the plot when the Y axis doesn't start at 0
|
|
this->m_xBlockTypeDistributions.clear();
|
|
this->m_xBlockTypeDistributions.resize(this->m_blockCount);
|
|
for (u64 i = 0; i < this->m_blockCount; ++i)
|
|
this->m_xBlockTypeDistributions[i] = this->m_startAddress + (stride * i * this->m_blockSize);
|
|
this->m_xBlockTypeDistributions.push_back(this->m_endAddress);
|
|
}
|
|
|
|
private:
|
|
// Variables used to store the parameters to process
|
|
|
|
// The size of the block we are considering for the analysis
|
|
u64 m_blockSize = 0;
|
|
u64 m_startAddress = 0;
|
|
u64 m_endAddress = 0;
|
|
// Start / size of the file
|
|
u64 m_baseAddress = 0;
|
|
u64 m_fileSize = 0;
|
|
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// Position of the handle inside the plot
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double m_handlePosition = 0.0;
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// Hold the number of blocks that have been processed
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// during the chunk-based entropy analysis
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u64 m_blockCount = 0;
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// Hold the number of bytes that have been processed
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// during the analysis (useful for the iterative analysis)
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u64 m_byteCount = 0;
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// Sampling size, number of elements displayed in the plot,
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// avoid showing to many data because it decreased the frame rate
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size_t m_sampleSize = 0;
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// Array used to hold the occurrences of each byte
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// (useful for the iterative analysis)
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std::array<ImU64, 256> m_blockValueCounts = {};
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// The m_xBlockTypeDistributions attributes are used to specify the position of
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// the values in the plot when the Y axis doesn't start at 0
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std::vector<float> m_xBlockTypeDistributions;
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// Hold the result of the byte distribution analysis
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std::array<std::vector<float>, 12> m_yBlockTypeDistributions, m_yBlockTypeDistributionsSampled;
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std::atomic<bool> m_processing = false;
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};
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}
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