Metafora arxeion apo sistima x se y...

[V13]

On Friday 28 June 2002 19:02, n01 wrote:
> To kathe sistima exei ta dika tou standards (p.x. FSType). Otan stelnontai
> dedomena pros ena allo sistima, ta apostalonta dedomena ti morfis einai...
> Einai diladi morfis katallilis kai amesis anagnosis apo to
> sistima-paralipti?, i to programma-paraliptis pou diaxeirizetai auta ta
> dedomena prepei na kanei protista kapoies metatropes se auta gia na einai
> prospelasima apo to sistima-paralipti?

An katalaba kala, anaferesai stin metafora enos arxeioy apo ena mixanima se 
ena allo, me diaforetiko OS kai pithanos diaforetiko H/W.

 Theoro oti den tithetai thema metaforas toy arxeioy kai oti mporeis na 
dimioyrgiseis akribes antigrafo apo to ena mixanima sto allo. To mono 
problima soy einai h anagnosi toy.

 An to arxeio einai text, tote mallon prepei na koitakseis ta diafora 
character sets kathos kai to thema toy CR/LF. (An skopeyeis na to parakaneis 
isos prepei na koitakseis kai to thema ton 7/8 bit, alla den pisteyo oti 
tithetai tetoio thema stis meres mas)

 An to arxeio einai binary, tote dystixos prepei na ksereis tin akribi domi 
toy giati ekei tithetai thema endianess kai einai adynato na to diabaseis an 
den gnorizeis AKRIBOS tin domi toy. An tin gnorizeis, tote prepei na ksereis 
oti opoy egrapses byte, tha diabaseis byte, eno opoy egrapses word (16bit) h 
dword(32 bit) tha prepei na ta grafeis ola se network byte order (blepe 
ntohs(), htons(), ntohl(), hotnl() ) kai na ta diabaseis etsi.. opote px:
 Gia kathe 16bit timi poy grafeis tin metatrepseis se NBO me tin htons() kai 
otan tin diabaseis tin pernas apo tin htons() kai tni xrisimopoieis. Etsi to 
programma einai kai portable kai xoris problimata me ta endianess.. Gia 
floating point kai 64bit int den nomizo na yparxei kati standard kai isos tha 
prepei na ta apothikeyeis san text. Oloi oi alloi synthetoi typoi anagonte se 
synola ton parapano.

> Ti papers-books tha mou proteinate na diabaso? Stin deuteri periptosi,
> iparxoun etoimoi algorithmoi metatropois ton dedomenon?

 Dystixos den exo na soy proteino kati. An omos ginosoyn poio sygkekrimenos 
isos na iksera kapoio paradeigma(programma) na koitakseis.

<<V13>>

p.s. Apo tin ali yparxei kai h XML (text power) :)