• Alexandre (19/19) Jul 15 2014 Hi :)
• bearophile (4/8) Jul 15 2014 See also core.bitop.bswap.
• Alexandre (12/15) Jul 15 2014 Thanks, but, when I convert I recive a 'c' in the front of my
• bearophile (18/20) Jul 15 2014 This shows it inverts all bits, not just the four byte positions.
• Alexandre (9/29) Jul 15 2014 Something is wrong between our communication...
• safety0ff (4/11) Jul 15 2014 You confused bswap with bitswap.
• =?UTF-8?B?QWxpIMOHZWhyZWxp?= (20/23) Jul 15 2014 That means to!int failed because 'val' contained a '@' character in it:
• Alexandre (3/29) Jul 15 2014 Strange..., why '@' ?
• anonymous (2/3) Jul 15 2014 because x"40" == "@"

"Alexandre" <alebencz gmail.com> writes:

Hi :)

I made this function to inverse the bytes in intger or T 
(possible) type...

int reverseBytes(T)(T val)
{
	int retVal = 0;
	static if(is(T == string))
		retVal = to!int(val);

	return (retVal & 0x000000FF) << 24 |
		   (retVal & 0x0000FF00) << 8 |
		   (retVal & 0x00FF0000) >> 8 |
		   (retVal & 0xFF000000) >> 24;
}

//...
writefln("%x", reverseBytes(x"00402030"));
//...

When I execute this program, I got this exception:
std.conv.ConvException C:\D\dmd2\src\phobos\std\conv.d(1968): 
Unexpected ' ' when converting from type string to type int

"bearophile" <bearophileHUGS lycos.com> writes:

Alexandre:

 	return (retVal & 0x000000FF) << 24 |
 		   (retVal & 0x0000FF00) << 8 |
 		   (retVal & 0x00FF0000) >> 8 |
 		   (retVal & 0xFF000000) >> 24;

See also core.bitop.bswap.

Bye,
bearophile

"Alexandre" <alebencz gmail.com> writes:

Thanks, but, when I convert I recive a 'c' in the front of my 
number...

uint reverseBytes(uint val)
{
	import core.bitop : bitswap;

	return bitswap(val);
}

//...
writefln("%x", reverseBytes(0x00402030));
//...

// output: c040200

On Tuesday, 15 July 2014 at 12:16:26 UTC, bearophile wrote:
 See also core.bitop.bswap.

 Bye,
 bearophile

"bearophile" <bearophileHUGS lycos.com> writes:

Alexandre:

 Thanks, but, when I convert I recive a 'c' in the front of my 
 number...

This shows it inverts all bits, not just the four byte positions. 
I don't understand:


import core.bitop: bitswap;

uint reverseBytes(in uint val) pure nothrow  safe  nogc {
     return val.bitswap;
}

void main() {
     import std.stdio;

     immutable uint x = 0x_00_40_20_30U;
     immutable uint y = x.reverseBytes;
     writefln("%08x", x);
     writefln("%032b", x);
     writefln("%08x", y);
     writefln("%032b", y);
}


Bye,
bearophile

"Alexandre" <alebencz gmail.com> writes:

Something is wrong between our communication...

I am wanting to do something better to order the bytes, for this 
my code...
https://gist.github.com/bencz/3576dfc8a217a34c05a9

For example, in that case:
injectData(image[0x207], x"30204000");

It's more simple to use something like:
injectData(image[0x207], inverseBytes(0x00402030));


On Tuesday, 15 July 2014 at 13:15:34 UTC, bearophile wrote:
 Alexandre:

 Thanks, but, when I convert I recive a 'c' in the front of my 
 number...

 This shows it inverts all bits, not just the four byte 
 positions. I don't understand:


 import core.bitop: bitswap;

 uint reverseBytes(in uint val) pure nothrow  safe  nogc {
     return val.bitswap;
 }

 void main() {
     import std.stdio;

     immutable uint x = 0x_00_40_20_30U;
     immutable uint y = x.reverseBytes;
     writefln("%08x", x);
     writefln("%032b", x);
     writefln("%08x", y);
     writefln("%032b", y);
 }


 Bye,
 bearophile

"safety0ff" <safety0ff.dev gmail.com> writes:

On Tuesday, 15 July 2014 at 12:24:48 UTC, Alexandre wrote:
 Thanks, but, when I convert I recive a 'c' in the front of my 
 number...

 uint reverseBytes(uint val)
 {
 	import core.bitop : bitswap;

 	return bitswap(val);
 }

You confused bswap with bitswap.
The former reverses bytes, the latter reverses bits.

If you look at bearophile's original message he says bswap.

=?UTF-8?B?QWxpIMOHZWhyZWxp?= <acehreli yahoo.com> writes:

On 07/15/2014 04:56 AM, Alexandre wrote:

          retVal = to!int(val);

 std.conv.ConvException C:\D\dmd2\src\phobos\std\conv.d(1968): Unexpected
 ' ' when converting from type string to type int

That means to!int failed because 'val' contained a ' ' character in it:

import std.conv;

void main()
{
     auto s = "42 ";    // <-- What is that?
     auto i = to!int(s);
}

However, there seems to be a bug in to(). It seems to incorrectly go one 
character ahead:

     to!int("mn");

"Unexpected 'n' when converting from type string to type int"

     to!int("m");

"Unexpected end of input when converting from type string to type int"

That is a bug, right?

So, in your case the unexpected ' ' character may be after another 
unexpected one:

     to!int("  ");

"Unexpected ' ' when converting from type string to type int"

Ali

"Alexandre" <alebencz gmail.com> writes:

Strange..., why ' ' ?

PS: Ali Çehreli, thanks for your book, your book is wonderful!!!

On Tuesday, 15 July 2014 at 13:49:51 UTC, Ali Çehreli wrote:
 On 07/15/2014 04:56 AM, Alexandre wrote:

          retVal = to!int(val);

 std.conv.ConvException C:\D\dmd2\src\phobos\std\conv.d(1968):

 Unexpected
 ' ' when converting from type string to type int

 That means to!int failed because 'val' contained a ' ' 
 character in it:

 import std.conv;

 void main()
 {
     auto s = "42 ";    // <-- What is that?
     auto i = to!int(s);
 }

 However, there seems to be a bug in to(). It seems to 
 incorrectly go one character ahead:

     to!int("mn");

 "Unexpected 'n' when converting from type string to type int"

     to!int("m");

 "Unexpected end of input when converting from type string to 
 type int"

 That is a bug, right?

 So, in your case the unexpected ' ' character may be after 
 another unexpected one:

     to!int("  ");

 "Unexpected ' ' when converting from type string to type int"

 Ali

"anonymous" <anonymous example.com> writes:

On Tuesday, 15 July 2014 at 14:05:14 UTC, Alexandre wrote:
 Strange..., why ' ' ?

because x"40" == " "