Digital Mars - digitalmars.D.learn - ubyte arrays to numbers

↑ ↓ ← → Leandro Lucarella <llucax gmail.com> writes:

lurker, el  7 de abril a las 11:43 me escribiste:
 hi,
 
 is there any good and easy way to convert ubyte arrays to short, ushort, int,
uint long and ulong?


if the byte order is correct, a cast should do it, if not, htons and htonl
should help (for longs, I think you have to roll your own hton).

-- 
Leandro Lucarella (luca) | Blog colectivo: http://www.mazziblog.com.ar/blog/
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GPG Key: 5F5A8D05 (F8CD F9A7 BF00 5431 4145  104C 949E BFB6 5F5A 8D05)
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SATANAS EN COMISARIA
	-- Crónica TV

Apr 07 2008

↑ ↓ ← → lurker <lurker lurker.com> writes:

do you know of any prefab functions of templates?

Leandro Lucarella Wrote:

 lurker, el  7 de abril a las 11:43 me escribiste:
 hi,
 
 is there any good and easy way to convert ubyte arrays to short, ushort, int,
uint long and ulong?


 if the byte order is correct, a cast should do it, if not, htons and htonl
 should help (for longs, I think you have to roll your own hton).
 
 -- 
 Leandro Lucarella (luca) | Blog colectivo: http://www.mazziblog.com.ar/blog/
 ----------------------------------------------------------------------------
 GPG Key: 5F5A8D05 (F8CD F9A7 BF00 5431 4145  104C 949E BFB6 5F5A 8D05)
 ----------------------------------------------------------------------------
 SATANAS EN COMISARIA
 	-- Crónica TV

Apr 07 2008

↑ ↓ ← → Regan Heath <regan netmail.co.nz> writes:

lurker wrote:
 do you know of any prefab functions of templates?
 
 Leandro Lucarella Wrote:
 
 lurker, el  7 de abril a las 11:43 me escribiste:
 hi,

 is there any good and easy way to convert ubyte arrays to short, ushort, int,
uint long and ulong?


 should help (for longs, I think you have to roll your own hton).




import std.stdio;

T convert(T)(ubyte[] data)
{
	return *(cast(T*)data[0..T.sizeof].ptr);
}

void main()
{
	writefln(convert!(ubyte) ([ 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
0x00 ]));  //2^7  = 128
	writefln(convert!(ushort)([ 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 
0x00 ]));  //2^15 = 32768
	writefln(convert!(uint)  ([ 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 
0x00 ]));	 //2^31 = 2147483648
	writefln(convert!(ulong) ([ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
0x80 ]));	 //2^63 = 9223372036854775808
}

** You'll want to un-wrap the array literals if your reader has wrapped 
the lines. :)

Regan

Apr 08 2008

↑ ↓ ← → lurker <lurker lurker.com> writes:

thank you so much

Regan Heath Wrote:

 lurker wrote:
 do you know of any prefab functions of templates?
 
 Leandro Lucarella Wrote:
 
 lurker, el  7 de abril a las 11:43 me escribiste:
 hi,

 is there any good and easy way to convert ubyte arrays to short, ushort, int,
uint long and ulong?


 should help (for longs, I think you have to roll your own hton).




 import std.stdio;
 
 T convert(T)(ubyte[] data)
 {
 	return *(cast(T*)data[0..T.sizeof].ptr);
 }
 
 void main()
 {
 	writefln(convert!(ubyte) ([ 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
 0x00 ]));  //2^7  = 128
 	writefln(convert!(ushort)([ 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 
 0x00 ]));  //2^15 = 32768
 	writefln(convert!(uint)  ([ 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 
 0x00 ]));	 //2^31 = 2147483648
 	writefln(convert!(ulong) ([ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
 0x80 ]));	 //2^63 = 9223372036854775808
 }
 
 ** You'll want to un-wrap the array literals if your reader has wrapped 
 the lines. :)
 
 Regan

Apr 08 2008