mirror of https://github.com/WerWolv/ImHex.git
139 lines
5.1 KiB
C++
139 lines
5.1 KiB
C++
#include "views/view_information.hpp"
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#include "providers/provider.hpp"
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#include "utils.hpp"
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#include <algorithm>
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#include <vector>
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#include <cstring>
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#include <cmath>
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#include <magic.h>
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#include <span>
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namespace hex {
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ViewInformation::ViewInformation(prv::Provider* &dataProvider) : View(), m_dataProvider(dataProvider) {
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View::subscribeEvent(Events::DataChanged, [this](void*) {
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this->m_shouldInvalidate = true;
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});
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}
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ViewInformation::~ViewInformation() {
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View::unsubscribeEvent(Events::DataChanged);
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}
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static float calculateEntropy(std::array<float, 256> &valueCounts, size_t numBytes) {
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float entropy = 0;
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for (u16 i = 0; i < 256; i++) {
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valueCounts[i] /= numBytes;
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if (valueCounts[i] > 0)
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entropy -= (valueCounts[i] * std::log2(valueCounts[i]));
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}
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return entropy / 8;
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}
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void ViewInformation::createView() {
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if (!this->m_windowOpen)
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return;
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if (ImGui::Begin("File Information", &this->m_windowOpen)) {
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ImGui::BeginChild("##scrolling", ImVec2(0, 0), false, ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoNav);
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if (this->m_dataProvider != nullptr && this->m_dataProvider->isReadable()) {
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if (this->m_shouldInvalidate) {
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{
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std::vector<u8> buffer(512, 0x00);
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std::memset(this->m_valueCounts.data(), 0x00, this->m_valueCounts.size() * sizeof(u32));
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this->m_blockEntropy.clear();
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for (u64 i = 0; i < this->m_dataProvider->getSize(); i += 512) {
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std::array<float, 256> blockValueCounts = { 0 };
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this->m_dataProvider->read(i, buffer.data(), std::min(512ULL, this->m_dataProvider->getSize() - i));
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for (u16 j = 0; j < 512; j++) {
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blockValueCounts[buffer[j]]++;
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this->m_valueCounts[buffer[j]]++;
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}
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this->m_blockEntropy.push_back(calculateEntropy(blockValueCounts, 512));
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}
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this->m_averageEntropy = calculateEntropy(this->m_valueCounts, this->m_dataProvider->getSize());
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this->m_highestBlockEntropy = *std::max_element(this->m_blockEntropy.begin(), this->m_blockEntropy.end());
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}
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{
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std::vector<u8> buffer(this->m_dataProvider->getSize(), 0x00);
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this->m_dataProvider->read(0x00, buffer.data(), buffer.size());
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{
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magic_t cookie = magic_open(MAGIC_NONE);
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magic_load(cookie, "magic");
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this->m_fileDescription = magic_buffer(cookie, buffer.data(), buffer.size());
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magic_close(cookie);
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}
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{
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magic_t cookie = magic_open(MAGIC_MIME);
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magic_load(cookie, "magic");
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this->m_mimeType = magic_buffer(cookie, buffer.data(), buffer.size());
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magic_close(cookie);
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}
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this->m_shouldInvalidate = false;
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}
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}
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ImGui::NewLine();
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ImGui::Text("Byte Distribution");
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ImGui::PlotHistogram("##nolabel", this->m_valueCounts.data(), 256, 0, nullptr, FLT_MAX, FLT_MAX, ImVec2(0, 100));
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ImGui::NewLine();
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ImGui::Separator();
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ImGui::NewLine();
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ImGui::Text("Entropy");
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ImGui::PlotLines("##nolabel", this->m_blockEntropy.data(), this->m_blockEntropy.size(), 0, nullptr, FLT_MAX, FLT_MAX, ImVec2(0, 100));
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ImGui::NewLine();
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ImGui::LabelText("Average entropy", "%.8f", this->m_averageEntropy);
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ImGui::LabelText("Highest entropy block", "%.8f", this->m_highestBlockEntropy);
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if (this->m_averageEntropy > 0.83 && this->m_highestBlockEntropy > 0.9) {
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ImGui::NewLine();
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ImGui::TextColored(ImVec4(0.92F, 0.25F, 0.2F, 1.0F), "This data is most likely encrypted or compressed!");
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}
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ImGui::NewLine();
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ImGui::Separator();
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ImGui::NewLine();
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ImGui::TextUnformatted("Description:");
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ImGui::TextWrapped("%s", this->m_fileDescription.c_str());
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ImGui::NewLine();
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ImGui::TextUnformatted("MIME Type:");
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ImGui::TextWrapped("%s", this->m_mimeType.c_str());
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ImGui::NewLine();
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}
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ImGui::EndChild();
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}
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ImGui::End();
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}
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void ViewInformation::createMenu() {
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if (ImGui::BeginMenu("View")) {
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ImGui::MenuItem("Entropy View", "", &this->m_windowOpen);
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ImGui::EndMenu();
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}
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}
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} |