Command line password prompt in PHP

These days I’ve been writing a quick command line script in PHP, and at some point I needed the user to type username and password to authenticate in some remote account. The standard way to prompt for a password in Linux is to hide the characters as the person goes typing, and I wanted that feeling on the script.

I assembled some code from here and here and I wrote a small function which prompts for username and password and returns an stdClass, which I share here:

function PromptUsrPwd()
{
	fwrite(STDOUT, 'Enter user name: ');
	$usr = trim(fgets(STDIN));
	$command = "/usr/bin/env bash -c 'echo OK'";
	if(rtrim(shell_exec($command)) !== 'OK') {
		die("Can't invoke bash.\n");
		return null;
	}
	$command = "/usr/bin/env bash -c 'read -s -p \"".
		addslashes("Password for $usr:").
		"\" mypassword && echo \$mypassword'";
	$pwd = rtrim(shell_exec($command));
	echo "\n";
	return (object)array('usr' => $usr, 'pwd' => $pwd);
}

This is an usage example. Run it on command line to see it in action:

$credentials = PromptUsrPwd();
echo 'Your name is '.$credentials->usr."\n";
echo 'Your password is '.$credentials->pwd."\n";

Brazilian progressive music

Well-made progressive music is just amazing. There’s not much to write about this one – lyrics (see here and here), arrangements, actual playing, mixing – there are no flaws I can spot. I’ll just leave this here and appreciate:



Unfortunately the other songs of the band are not good as this one – not even close, actually. But this very one song is so exceptionally good that the guys can die in peace.

jQuery facepunches old IE versions

The jQuery team announced that they dropped support for Internet Explorer 6, 7 and 8 on the v2.0.0 of the library. That’s one huge and important move. First, because jQuery is widely used worldwide, and even endorsed by some big companies like Microsoft and Google. Second, because these versions of Internet Explorer still have a considerable percentage of the market share as of today. The jQuery guys announced that v1.9.x will still support these old IE versions, but who knows for how long.

This made me think the primary reason that jQuery was conceived for: a thin layer of cross-browser compatibility. If the library is not so widely compatible anymore, isn’t it losing its main reason to exist? Or maybe it’s heading towards becoming a framework like many others, just providing some useful and funny tricks.

I’m not against this decision, but given the wide adoption of jQuery in the wild, maybe it’s too early to force the migration to the latest IE version. Although when I think of the real pain that is to develop to those terrible browsers, I just raise my hands and scream hallelujah, they finally did it!

The best SRT editor for subtitles

After a couple months of work, it has just been published on CNet’s Download.com my newest program: SRTEd, a visual and portable editor to SRT files for Windows.

Basically, I decided to write this program because I had to edit some subtitles a while ago, in SRT format, and the available editors were quite tedious and painful to use. I somewhat got this insight of a more visual editor, and some time later I began writing it. The most important thing to “get the feel” is the use of the keyboard arrow keys to sync the subs. Left/right arrows move them, and when holding Shift key, change the duration. This makes the sync incredibly easy to do, visual.



Technically, the program is pure C-like C++ (that’s how I define my own C++ style) and native Win32, so it’s really light and fast. To video playback, it uses DirectX infrastructure. Moreover, SRTEd uses my own Win32 object-oriented library, which I plan to release as open source some day.

Here’s a getting started video:



CNet download link: SRTEd - SRT Subtitles Editor.

Update: I just received an e-mail from Softpedia, they published SRTEd on their site too.

KRK VXT frequency charts

As looking for a pair of studio monitors, I wanted to have a comparison between the three KRK VXT series models: VXT4, VXT6 and VXT8 – cones being respectively 4, 6 and 8 inches. I got the individual charts from KRK website, and I just made a collage with the three. This is what I ended up with:



It’s easy to spot how the low end increases with the cone size. Many people recommend a subwoofer, but not everyone has an appropriated room to fit everything. Indeed, in my case, I can hardly fit anything larger than the VXT4 on my desk, so I’ll probably have to stick with the VXT4 or other monitor with similar size, like the Yamaha HS50M – although I found these too bright and lacking in lows, rather unpleasant.

And the quest for my new home studio monitors goes on.

Update: after a lot of research and some listenings, I ended up picking up the KRK VXT4, which not only sounds really good, but also fits my desk. I’ve got a new pair for a good price, and I’m pretty satisfied so far.

Reading version from EXE and DLL files

Here’s a C++ and Win32 class to read version information from the resource section within EXE and DLL Windows binaries. The key functions are GetFileVersionInfo and VerQueryValue. The object will provide public pointers to the strings; these pointers should not be deleted, since they point straight into the allocated data block. If version information can’t be read – for example, if it’s a file with no version information – the load method will simply return false.

There’s room for more improvements, like tighter error checking, but it’s pretty usable:

#include <Windows.h>
#pragma comment(lib, "Version.lib")

class VersionInfo {
public:
	const wchar_t *pComments, *pCompanyName, *pLegalCopyright, *pProductVersion;

	VersionInfo() : _data(NULL),
		pComments(NULL), pCompanyName(NULL),
		pLegalCopyright(NULL), pProductVersion(NULL) { }

	~VersionInfo() {
		if(_data) free(_data);
	}

	bool load(const wchar_t *path) {
		DWORD szVer = 0;
		if(!(szVer = GetFileVersionInfoSize(path, &szVer)))
			return false;
		_data = (BYTE*)malloc(sizeof(BYTE) * szVer);
		if(!GetFileVersionInfo(path, 0, szVer, _data))
			return false;

		UINT len = 0;
		VerQueryValue(_data, L"\\StringFileInfo\\040904b0\\Comments",
			(void**)&pComments, &len);
		VerQueryValue(_data, L"\\StringFileInfo\\040904b0\\CompanyName",
			(void**)&pCompanyName, &len);
		VerQueryValue(_data, L"\\StringFileInfo\\040904b0\\LegalCopyright",
			(void**)&pLegalCopyright, &len);
		VerQueryValue(_data, L"\\StringFileInfo\\040904b0\\ProductVersion",
			(void**)&pProductVersion, &len);
		return true;
	}

private:
	BYTE *_data;
};

Usage example:

{
	VersionInfo vi;
	if(vi.load(L"C:\\Program.exe")) {
		OutputDebugString(vi.pProductVersion);
		OutputDebugString(vi.pComments);
	}
}

Can’t be simpler than that.

Like Firefox? Try Pale Moon

When it comes to internet browsers, overall, I prefer Firefox behavior over Chrome’s. But when using Firefox 18.0.2 on Windows 7 x64, I started to become increasingly angry with its memory usage. Even with only 4 tabs opened, Firefox peaked 800 MB of RAM easily, like not releasing memory at all. This was making Firefox really slow, a pain to use.

Searching around, I found Pale Moon. Basically it’s Firefox compiled specifically for Windows, letting out compatibility with older processors, all compiler optimization switches on, and also some minor changes done by the Pale Moon mantainer, which follows Firefox with some gap, waiting for the bugs to be fixed. Pale Moon seems to release memory faster, and on my tests, the RAM usage floats around 300 MB, compared to 800 MB on Firefox. On the use, it’s noticeably faster, a joy.

I’m testing a portable version of Pale Moon 15.4.1, and so far I’m very pleased. All my add-ons worked fine. I totally recommend it as an alternative to Firefox itself.

Adobe Source Code Pro font

I’ve just downloaded the new open source monospaced font from Adobe: Source Code Pro. I’m using it at 9pt size on Windows, and it has the same vertical and horizontal size of Microsoft's acclaimed Consolas font at 10pt – it means each character occupies the exact same square of pixels. Coincidence? Maybe not. Consolas is a great coding font praised by thousands of programmers around the world, so it’s natural that it could have been used as parameter.

My impression so far is that Source Code Pro looks lighter than Consolas, with less cluttering. It looks like a crossover between Consolas and Inconsolata, a font which looks absolutely great on Linux, but bad on Windows.

On Linux, Source Code Pro at 9pt renders as good as in Windows. It occupies the same horizontal spacing of Inconsolata at 10pt, but more vertical spacing. Too much vertical space, in my opinion; at 8pt, the font is too small if compared to the line height it has. It would be a lot better if this vertical space could be cut down. And the bold is too bold.

Source Code Pro can be downloaded at SourceForge, and the project is hosted on GitHub, which is a great initiative.

I’m really picky about the font I code with – in fact, I’m absolutely paranoid about it, I often change the font I use –, and I consider Source Code Pro worth trying on Windows, I can stare at it for hours without getting tired. Definitely added to my monospaced fonts collection, and from now on, the default monospaced font on this blog!

jQuery with requestAnimationFrame

The requestAnimationFrame specification is being cooked to replace the over-used setTimeout call when doing JavaScript animations. By specifically targeting animations, it’s highly optimized for this purpose. And since JavaScript animations are becoming more and more widespread, I believe it’s a great initiative, aiming to smooth all moving things inside your browser window. Concept and usage are well explained on this article.

If you use jQuery, however, you are not taking benefit of this new specification. It was used on a previous version, but it was dropped since then. I believe it should have been kept, misuse of the animation features shouldn’t have guided this decision. Anyway, when I was developing a jQuery plugin to embed requestAnimationFrame inside jQuery animation again, I just found out that someone had already done that. It’s available on GitHub and it works very well. The author has also made some claims on jQuery forums to make it default inside the library, with no success so far.

So, this is what you need to do (the file you need is within dist directory):

<script type="text/javascript" src="jquery-1.8.3.min.js"></script>
<script type="text/javascript" src="jquery.requestAnimationFrame.min.js"></script>

Animations instantly became smoother on Firefox on Linux. Highly recommended.

R.I.P. victims of the loudness wars

Terribly mixed, brickwalled, clipped everywhere, static noise, ears bleeding, the horror... loudness wars victims. As an audiophile, it deeply saddens me when I find a good album ruined by a horrible mixing. I think this disease began spreading towards the end of the 1990’s, and from now on, most of the albums are simply unlistenable. Producers responsible by these atrocities should die slowly and in great pain, by having all their blood drained away from their perforated eardrums.

Here it follows a list of some ruined albums which I particularly mourn over, because I cannot listen to:

Slayer Undisputed Attitude 1996 -10.54 dB Red Hot Chili Peppers Californication 1999 -12.42 dB Children of Bodom Follow the Reaper 2000 -12.63 dB Pantera Reinventing the Steel 2000 -11.42 dB Stratovarius Infinite 2000 -11.47 dB

Rage Against the Machine Renegades 2000 -11.98 dB Velvet Revolver Contraband 2004 -10.45 dB Franz Ferdinand You Could Have It So Much Better 2005 -11.02 dB Audioslave Revelations 2006 -11.14 dB Joey Ramone Ya Know? 2012 -10.12 dB

There you have something that makes me really sad about.

Blurry fonts on Firefox 18

Firefox is the browser which behavior I like most, but it’s seriously becoming a pain to use, version after version. I’ve just upgraded my Firefox to the ridiculous version number 18, and on some specific sites the fonts look terribly blurry. Seriously, they hurt my eyes. It’s specially noticeable on Google sites, like Gmail, Blogger, YouTube, Groups and Docs – and the font in Docs looks particularly bad.

I’ve run through some fixes from previous versions (though I never had this problem before), like this, this and this. Nothing seems to work. I’m using both Windows XP and Windows 7 to perform all these tests. At first, I thought it would be a problem of GPU rendering overriding ClearType settings, but the fonts are also blurry on Linux!

There’s a thread at Mozilla’s board with some people complaining about this since v17, where the solution was to disable hardware acceleration – what I did already, to fix other rendering problems at that time. On v18, however, no one could find a fix yet, it looks like they really messed it up. So if you have this problem, go make some noise at that thread!

Congratulations to Mozilla for dropping the ball again, with its moronic and Chrome-wannabe release cycling which is introducing more and more bugs. If I wanted Chrome, I would have downloaded Chrome.

Automation for C++ COM pointers

This week I was working on a C++ program which used a lot of COM pointers. I remembered I’ve seen an automation class somewhere, and after some searching I found it, it’s Microsoft’s ComPtr template class. Although I liked the concept, it had too much fuss to me, so I was displeased in using it.

Oh well, here we go again: I wrote my own COM pointer automation class. Here it goes the full code of it, which I now share with the world:

#pragma once
#include <Windows.h>
#include <ObjBase.h>

template<typename T> class ComPtr {
public:
	ComPtr()                    : _ptr(NULL) { }
	ComPtr(const ComPtr& other) : _ptr(NULL) { operator=(other); }
	~ComPtr()                   { this->release(); }
	ComPtr& operator=(const ComPtr& other) {
		if(this != &other) {
			this->~ComPtr();
			_ptr = other._ptr;
			if(_ptr) _ptr->AddRef();
		}
		return *this;
	}
	void release() {
		if(_ptr) {
			_ptr->Release();
			_ptr = NULL;
		}
	}
	bool coCreateInstance(REFCLSID rclsid) {
		return _ptr ? false :
			SUCCEEDED(::CoCreateInstance(rclsid, 0, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&_ptr)));
	}
	bool coCreateInstance(REFCLSID rclsid, REFIID riid) {
		return _ptr ? false :
			SUCCEEDED(::CoCreateInstance(rclsid, 0, CLSCTX_INPROC_SERVER, riid, (void**)&_ptr));
	}
	template<typename COM_INTERFACE> bool queryInterface(REFIID riid, COM_INTERFACE **comPtr) {
		return !_ptr ? false :
			SUCCEEDED(_ptr->QueryInterface(riid, (void**)comPtr));
	}
	bool isNull() const { return _ptr == NULL; }
	T&   operator*()    { return *_ptr; }
	T*   operator->()   { return _ptr; }
	T**  operator&()    { return &_ptr; }
	operator T*() const { return _ptr; }
private:
	T *_ptr;
};

Basically, by using this class I don’t have to worry about calling the Release method. Most interestingly, I added two shorhand methods to ease my life, coCreateInstance and queryInterface. Here are an example illustrating the use of the ComPtr class, along with the cited methods:

{
	ComPtr<IGraphBuilder> graph;
	if(!graph.coCreateInstance(CLSID_FilterGraph))
		OutputDebugString(L"Failed!");

	ComPtr<IMediaControl> mediaCtrl;
	if(!graph.queryInterface(IID_IMediaControl, &mediaCtrl))
		OutputDebugString(L"Failed!");

	graph->RenderFile(L"foo.avi", NULL); // sweet!
}

If you’re wondering about the usefulness of this ComPtr class, try to write the code above without it.