From 2cb36d8f7ba30e1ba2b4e3566aede9016e15399f Mon Sep 17 00:00:00 2001
From: Rusty Wagner <rusty.wagner@gmail.com>
Date: Fri, 12 Mar 2021 03:22:01 -0500
Subject: Add a QTextBrowser capable of showing remote images

---
 ui/textbrowser.h | 114 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 ui/textbrowser.h

diff --git a/ui/textbrowser.h b/ui/textbrowser.h
new file mode 100644
index 00000000..9d4d33c3
--- /dev/null
+++ b/ui/textbrowser.h
@@ -0,0 +1,114 @@
+#pragma once
+
+#include <QtWidgets/QTextBrowser>
+#include <QtGui/QTextDocument>
+#include <QtGui/QTextBlock>
+#include <QtGui/QTextFragment>
+#include <QtGui/QImage>
+#include <QtCore/QThread>
+#include <QtCore/QMutex>
+#include <QtCore/QWaitCondition>
+#include <QtCore/QSharedPointer>
+#include <queue>
+#include <optional>
+#include "binaryninjaapi.h"
+#include "uitypes.h"
+
+class TextBrowser;
+class TextBrowserDownloadThread;
+
+class BINARYNINJAUIAPI TextBrowserDownloadCache
+{
+	QMutex m_mutex;
+	std::map<QUrl, QByteArray> m_downloadCache;
+	std::set<QUrl> m_inProgress;
+
+public:
+	TextBrowserDownloadCache();
+
+	bool lookup(const QUrl& url, QByteArray& result);
+	void add(const QUrl& url, const QByteArray& data);
+
+	void beginRequest(const QUrl& url);
+	void endRequest(const QUrl& url);
+	bool isInProgress(const QUrl& url);
+};
+
+class TextBrowserDownloadQueue: public QObject
+{
+	Q_OBJECT
+
+	QMutex m_mutex;
+	QWaitCondition m_cond;
+	TextBrowser* m_owner;
+
+	std::queue<QUrl> m_queue;
+
+	size_t m_activeThreads = 0;
+
+	static uint64_t AppendDataCallback(uint8_t* data, uint64_t len, void* ctxt);
+
+public:
+	TextBrowserDownloadQueue(TextBrowser* owner);
+
+	void stop();
+	void threadFinished();
+	bool processNextEvent(BinaryNinja::DownloadInstance* downloadInstance);
+	void downloadData(const QUrl& name);
+
+Q_SIGNALS:
+	void dataDownloaded(QUrl name, QByteArray contents);
+};
+
+class TextBrowserDownloadThread: public QThread
+{
+	Q_OBJECT
+
+	QMutex m_mutex;
+	TextBrowserDownloadQueue* m_queue;
+
+	BinaryNinja::Ref<BinaryNinja::DownloadProvider> m_provider;
+	BinaryNinja::Ref<BinaryNinja::DownloadInstance> m_downloadInstance;
+
+protected:
+	virtual void run() override;
+
+public:
+	TextBrowserDownloadThread(TextBrowserDownloadQueue* queue);
+};
+
+class BINARYNINJAUIAPI TextBrowser: public QTextBrowser
+{
+	Q_OBJECT
+
+	QSharedPointer<TextBrowserDownloadCache> m_cache;
+	bool m_ownedCache;
+
+	TextBrowserDownloadQueue* m_queue;
+	bool m_resizeImagesToWidth = false;
+
+	std::set<QUrl> m_requested;
+	std::optional<QUrl> m_markdownUrl;
+	QString m_markdownPrefix;
+
+	void resizeImageFragment(QTextBlock& block, QTextFragment fragment,
+		QTextImageFormat imgFormat, const QImage& contents);
+
+protected:
+	virtual void resizeEvent(QResizeEvent* e) override;
+
+public:
+	TextBrowser(QSharedPointer<TextBrowserDownloadCache> cache = QSharedPointer<TextBrowserDownloadCache>());
+	virtual ~TextBrowser();
+
+	void reset();
+	virtual QVariant loadResource(int type, const QUrl &name) override;
+
+	void resizeImagesToWidth();
+	QSharedPointer<TextBrowserDownloadCache> cache() { return m_cache; }
+
+	void downloadMarkdown(QUrl url, QString prefix = QString());
+
+private Q_SLOTS:
+	void dataDownloaded(QUrl name, QByteArray contents);
+};
-- 
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