#include <Core/Core.h>

using namespace Upp;

inline String PrintUsage() {
	StringBuffer sb;
	sb << "Prints hex view of selected file\n\n\
Syntax:\n"
<< GetExeTitle() << " [file]\n\n\
Options:\n\
file\t\t Path to selected file\n";
	return sb;
}

CONSOLE_APP_MAIN
{
	const Vector<String>& cl = CommandLine();

	if (cl.GetCount() == 0)
	{
		SetExitCode(0);
		Cout() << PrintUsage();
		return;
	}

	String filePath(NormalizePath(cl[0]));

	if (!FileExists(filePath))
	{
		SetExitCode(1);
		Cerr() << Format("File \"%s\" doesn't exists\n", filePath);
		return;
	}

	FileMapping fm;

	if (!fm.Open(filePath))
	{
		SetExitCode(1);
		Cerr() << Format("Can't read \"%s\" file\n", filePath);
		return;
	}

	const int wrapCount = 16,
		blockSize = wrapCount * 4096;

	int64 count = fm.GetFileSize(),
		offset = 0;

	while (count > 0)
	{
		const int lenght = min<int64>(count, blockSize);
		const String& data = fm.GetData(offset, lenght);
		count -= lenght; offset += lenght;

		for (int i = 0; i < data.GetCount(); ++i)
		{
			const String& hex = Format64Hex(byte(data[i]));
			Cout() << Format(" %2s", hex);

			if ((i + 1) % wrapCount == 0)
				Cout() << '\n';
		}
	}
}