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digitalmars.D.learn - ubyte arrays to numbers

reply lurker <lurker lurker.com> writes:
hi,

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

thanks 

lurker
Apr 07 2008
parent reply 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/ ---------------------------------------------------------------------------- GPG Key: 5F5A8D05 (F8CD F9A7 BF00 5431 4145 104C 949E BFB6 5F5A 8D05) ---------------------------------------------------------------------------- SATANAS EN COMISARIA -- Crónica TV
Apr 07 2008
parent reply 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
parent reply 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
parent 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