mirror of https://github.com/WerWolv/ImHex.git
84 lines
2.6 KiB
C++
84 lines
2.6 KiB
C++
#include "views/view_entropy.hpp"
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#include "providers/provider.hpp"
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#include "utils.hpp"
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#include <vector>
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#include <cstring>
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#include <cmath>
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namespace hex {
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ViewEntropy::ViewEntropy(prv::Provider* &dataProvider) : View(), m_dataProvider(dataProvider) {
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}
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ViewEntropy::~ViewEntropy() {
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}
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void ViewEntropy::createView() {
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if (!this->m_windowOpen)
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return;
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if (ImGui::Begin("Entropy", &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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std::vector<u8> buffer(512, 0x00);
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std::memset(this->m_valueCounts, 0x00, sizeof(this->m_valueCounts));
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for (u64 i = 0; i < this->m_dataProvider->getSize(); i += 512) {
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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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this->m_valueCounts[buffer[j]]++;
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}
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size_t numBytes = this->m_dataProvider->getSize();
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this->m_entropy = 0;
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for (u16 i = 0; i < 256; i++) {
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this->m_valueCounts[i] /= numBytes;
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if (this->m_valueCounts[i] > 0)
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this->m_entropy -= this->m_valueCounts[i] * std::log2(this->m_valueCounts[i]);
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}
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this->m_entropy /= 8;
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this->m_shouldInvalidate = false;
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}
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ImGui::LabelText("Entropy", "%.8f", this->m_entropy);
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if (this->m_entropy > 0.99)
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ImGui::TextUnformatted("This file is most likely encrypted or compressed!");
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ImGui::Separator();
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ImGui::NewLine();
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ImGui::PlotHistogram("Byte Distribution", this->m_valueCounts, 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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if (ImGui::Button("Invalidate"))
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this->m_shouldInvalidate = true;
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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 ViewEntropy::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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} |