329 lines
14 KiB
C++
329 lines
14 KiB
C++
#include "content/views/view_diff.hpp"
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#include <hex/api/imhex_api.hpp>
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#include <hex/helpers/fmt.hpp>
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#include <hex/providers/buffered_reader.hpp>
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namespace hex::plugin::builtin {
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namespace {
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constexpr u32 getDiffColor(u32 color) {
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return (color & 0x00FFFFFF) | 0x40000000;
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}
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}
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ViewDiff::ViewDiff() : View("hex.builtin.view.diff.name") {
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// Clear the selected diff providers when a provider is closed
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EventManager::subscribe<EventProviderClosed>(this, [this](prv::Provider *) {
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for (u8 i = 0; i < 2; i++) {
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this->m_columns[i].provider = -1;
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this->m_columns[i].hexEditor.setSelectionUnchecked(std::nullopt, std::nullopt);
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}
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this->m_diffs.clear();
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});
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// Set the background highlight callbacks for the two hex editor columns
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this->m_columns[0].hexEditor.setBackgroundHighlightCallback(this->createCompareFunction(1));
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this->m_columns[1].hexEditor.setBackgroundHighlightCallback(this->createCompareFunction(0));
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}
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ViewDiff::~ViewDiff() {
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EventManager::unsubscribe<EventProviderClosed>(this);
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}
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namespace {
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bool drawDiffColumn(ViewDiff::Column &column, float height) {
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bool scrolled = false;
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ImGui::PushID(&column);
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// Draw the hex editor
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float prevScroll = column.hexEditor.getScrollPosition();
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column.hexEditor.draw(height);
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float currScroll = column.hexEditor.getScrollPosition();
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// Check if the user scrolled the hex editor
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if (prevScroll != currScroll) {
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scrolled = true;
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column.scrollLock = 5;
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}
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ImGui::PopID();
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return scrolled;
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}
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bool drawProviderSelector(ViewDiff::Column &column) {
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bool shouldReanalyze = false;
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ImGui::PushID(&column);
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auto &providers = ImHexApi::Provider::getProviders();
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auto &providerIndex = column.provider;
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// Get the name of the currently selected provider
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std::string preview;
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if (ImHexApi::Provider::isValid() && providerIndex >= 0)
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preview = providers[providerIndex]->getName();
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// Draw combobox with all available providers
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ImGui::SetNextItemWidth(ImGui::GetContentRegionAvail().x);
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if (ImGui::BeginCombo("", preview.c_str())) {
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for (size_t i = 0; i < providers.size(); i++) {
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ImGui::PushID(i + 1);
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if (ImGui::Selectable(providers[i]->getName().c_str())) {
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providerIndex = i;
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shouldReanalyze = true;
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}
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ImGui::PopID();
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}
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ImGui::EndCombo();
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}
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ImGui::PopID();
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return shouldReanalyze;
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}
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}
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std::function<std::optional<color_t>(u64, const u8*, size_t)> ViewDiff::createCompareFunction(size_t otherIndex) const {
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// Create a function that will handle highlighting the differences between the two providers
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// This is a stupidly simple diffing implementation. It will highlight bytes that are different in yellow
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// and if one provider is larger than the other it will highlight the extra bytes in green or red depending on which provider is larger
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// TODO: Use an actual binary diffing algorithm that searches for the longest common subsequences
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return [this, otherIndex](u64 address, const u8 *data, size_t) -> std::optional<color_t> {
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const auto &providers = ImHexApi::Provider::getProviders();
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auto otherId = this->m_columns[otherIndex].provider;
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// Check if the other provider is valid
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if (otherId < 0 || size_t(otherId) >= providers.size())
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return std::nullopt;
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auto &otherProvider = providers[otherId];
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// Handle the case where one provider is larger than the other one
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if (address > otherProvider->getActualSize()) {
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if (otherIndex == 1)
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return getDiffColor(ImGuiExt::GetCustomColorU32(ImGuiCustomCol_DiffAdded));
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else
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return getDiffColor(ImGuiExt::GetCustomColorU32(ImGuiCustomCol_DiffRemoved));
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}
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// Read the current byte from the other provider
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u8 otherByte = 0x00;
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otherProvider->read(address, &otherByte, 1);
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// Compare the two bytes, highlight both in yellow if they are different
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if (otherByte != *data)
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return getDiffColor(ImGuiExt::GetCustomColorU32(ImGuiCustomCol_DiffChanged));
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// No difference
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return std::nullopt;
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};
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}
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void ViewDiff::analyze(prv::Provider *providerA, prv::Provider *providerB) {
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auto commonSize = std::min(providerA->getActualSize(), providerB->getActualSize());
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this->m_diffTask = TaskManager::createTask("Diffing...", commonSize, [this, providerA, providerB](Task &task) {
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std::vector<Diff> differences;
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// Set up readers for both providers
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auto readerA = prv::ProviderReader(providerA);
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auto readerB = prv::ProviderReader(providerB);
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// Iterate over both providers and compare the bytes
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for (auto itA = readerA.begin(), itB = readerB.begin(); itA < readerA.end() && itB < readerB.end(); ++itA, ++itB) {
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// Stop comparing if the diff task was canceled
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if (task.wasInterrupted())
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break;
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// If the bytes are different, find the end of the difference
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if (*itA != *itB) {
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u64 start = itA.getAddress();
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size_t end = 0;
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while (itA != readerA.end() && itB != readerB.end() && *itA != *itB) {
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++itA;
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++itB;
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++end;
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}
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// Add the difference to the list
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differences.push_back(Diff { Region{ start, end }, ViewDiff::DifferenceType::Modified });
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}
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// Update the progress bar
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task.update(itA.getAddress());
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}
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// If one provider is larger than the other, add the extra bytes to the list
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if (providerA->getActualSize() != providerB->getActualSize()) {
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auto endA = providerA->getActualSize() + 1;
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auto endB = providerB->getActualSize() + 1;
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if (endA > endB)
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differences.push_back(Diff { Region{ endB, endA - endB }, ViewDiff::DifferenceType::Added });
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else
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differences.push_back(Diff { Region{ endA, endB - endA }, ViewDiff::DifferenceType::Removed });
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}
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// Move the calculated differences over so they can be displayed
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this->m_diffs = std::move(differences);
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this->m_analyzed = true;
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});
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}
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void ViewDiff::drawContent() {
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if (ImGui::Begin(View::toWindowName("hex.builtin.view.diff.name").c_str(), &this->getWindowOpenState(), ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoScrollWithMouse)) {
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auto &[a, b] = this->m_columns;
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a.hexEditor.enableSyncScrolling(false);
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b.hexEditor.enableSyncScrolling(false);
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if (a.scrollLock > 0) a.scrollLock--;
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if (b.scrollLock > 0) b.scrollLock--;
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// Change the hex editor providers if the user selected a new provider
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{
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const auto &providers = ImHexApi::Provider::getProviders();
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if (a.provider >= 0 && size_t(a.provider) < providers.size())
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a.hexEditor.setProvider(providers[a.provider]);
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else
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a.hexEditor.setProvider(nullptr);
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if (b.provider >= 0 && size_t(b.provider) < providers.size())
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b.hexEditor.setProvider(providers[b.provider]);
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else
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b.hexEditor.setProvider(nullptr);
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}
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// Analyze the providers if they are valid and the user selected a new provider
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if (!this->m_analyzed && a.provider != -1 && b.provider != -1 && !this->m_diffTask.isRunning()) {
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const auto &providers = ImHexApi::Provider::getProviders();
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auto providerA = providers[a.provider];
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auto providerB = providers[b.provider];
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this->analyze(providerA, providerB);
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}
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const auto height = ImGui::GetContentRegionAvail().y;
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// Draw the two hex editor columns side by side
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if (ImGui::BeginTable("##binary_diff", 2, ImGuiTableFlags_None, ImVec2(0, height - 250_scaled))) {
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ImGui::TableSetupColumn("hex.builtin.view.diff.provider_a"_lang);
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ImGui::TableSetupColumn("hex.builtin.view.diff.provider_b"_lang);
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ImGui::TableHeadersRow();
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ImGui::BeginDisabled(this->m_diffTask.isRunning());
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{
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// Draw first provider selector
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ImGui::TableNextColumn();
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if (drawProviderSelector(a)) this->m_analyzed = false;
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// Draw second provider selector
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ImGui::TableNextColumn();
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if (drawProviderSelector(b)) this->m_analyzed = false;
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}
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ImGui::EndDisabled();
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ImGui::TableNextRow();
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// Draw first hex editor column
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ImGui::TableNextColumn();
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bool scrollB = drawDiffColumn(a, height - 250_scaled);
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// Draw second hex editor column
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ImGui::TableNextColumn();
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bool scrollA = drawDiffColumn(b, height - 250_scaled);
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// Sync the scroll positions of the hex editors
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{
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if (scrollA && a.scrollLock == 0) {
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a.hexEditor.setScrollPosition(b.hexEditor.getScrollPosition());
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a.hexEditor.forceUpdateScrollPosition();
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}
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if (scrollB && b.scrollLock == 0) {
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b.hexEditor.setScrollPosition(a.hexEditor.getScrollPosition());
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b.hexEditor.forceUpdateScrollPosition();
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}
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}
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ImGui::EndTable();
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}
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// Draw the differences table
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if (ImGui::BeginTable("##differences", 3, ImGuiTableFlags_Borders | ImGuiTableFlags_ScrollY | ImGuiTableFlags_Reorderable | ImGuiTableFlags_Resizable, ImVec2(0, 200_scaled))) {
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ImGui::TableSetupScrollFreeze(0, 1);
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ImGui::TableSetupColumn("hex.builtin.common.begin"_lang);
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ImGui::TableSetupColumn("hex.builtin.common.end"_lang);
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ImGui::TableSetupColumn("hex.builtin.common.type"_lang);
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ImGui::TableHeadersRow();
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// Draw the differences if the providers have been analyzed
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if (this->m_analyzed) {
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ImGuiListClipper clipper;
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clipper.Begin(int(this->m_diffs.size()));
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while (clipper.Step())
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for (int i = clipper.DisplayStart; i < clipper.DisplayEnd; i++) {
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ImGui::TableNextRow();
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// Prevent the list from trying to access non-existing diffs
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if (size_t(i) >= this->m_diffs.size())
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break;
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ImGui::PushID(i);
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const auto &diff = this->m_diffs[i];
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// Draw a clickable row for each difference that will select the difference in both hex editors
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// Draw start address
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ImGui::TableNextColumn();
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if (ImGui::Selectable(hex::format("0x{:02X}", diff.region.getStartAddress()).c_str(), false, ImGuiSelectableFlags_SpanAllColumns)) {
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a.hexEditor.setSelection(diff.region);
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a.hexEditor.jumpToSelection();
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b.hexEditor.setSelection(diff.region);
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b.hexEditor.jumpToSelection();
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}
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// Draw end address
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ImGui::TableNextColumn();
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ImGui::TextUnformatted(hex::format("0x{:02X}", diff.region.getEndAddress()).c_str());
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// Draw difference type
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ImGui::TableNextColumn();
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switch (diff.type) {
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case DifferenceType::Modified:
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ImGuiExt::TextFormattedColored(ImGuiExt::GetCustomColorVec4(ImGuiCustomCol_DiffChanged), "hex.builtin.view.diff.modified"_lang);
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break;
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case DifferenceType::Added:
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ImGuiExt::TextFormattedColored(ImGuiExt::GetCustomColorVec4(ImGuiCustomCol_DiffAdded), "hex.builtin.view.diff.added"_lang);
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break;
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case DifferenceType::Removed:
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ImGuiExt::TextFormattedColored(ImGuiExt::GetCustomColorVec4(ImGuiCustomCol_DiffRemoved), "hex.builtin.view.diff.removed"_lang);
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break;
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}
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ImGui::PopID();
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}
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}
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ImGui::EndTable();
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}
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}
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ImGui::End();
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}
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} |