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UTF-8 encode and decode: Difference between revisions
Added solution for Action!
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[e2,82,ac] €
[f0,9d,84,9e] 𝄞
</pre>
=={{header|Action!}}==
<lang Action!>TYPE Unicode=[BYTE bc1,bc2,bc3]
BYTE ARRAY hex=['0 '1 '2 '3 '4 '5 '6 '7 '8 '9 'A 'B 'C 'D 'E 'F]
BYTE FUNC DecodeHex(CHAR c)
BYTE i
FOR i=0 TO 15
DO
IF c=hex(i) THEN
RETURN (i)
FI
OD
Break()
RETURN (255)
BYTE FUNC DecodeHex2(CHAR c1,c2)
BYTE h1,h2,res
h1=DecodeHex(c1)
h2=DecodeHex(c2)
res=(h1 LSH 4)%h2
RETURN (res)
PROC ValUnicode(CHAR ARRAY s Unicode POINTER u)
BYTE i,len
len=s(0)
IF len<6 AND len>8 THEN Break() FI
IF s(1)#'U OR s(2)#'+ THEN Break() FI
IF len=6 THEN
u.bc1=0
ELSEIF len=7 THEN
u.bc1=DecodeHex(s(3))
IF u.bc1>$10 THEN Break() FI
ELSE
u.bc1=DecodeHex2(s(3),s(4))
FI
u.bc2=DecodeHex2(s(len-3),s(len-2))
u.bc3=DecodeHex2(s(len-1),s(len))
RETURN
PROC PrintHex2(BYTE x)
Put(hex(x RSH 4))
Put(hex(x&$0F))
RETURN
PROC StrUnicode(Unicode POINTER u)
Print("U+")
IF u.bc1>$F THEN
PrintHex2(u.bc1)
ELSEIF u.bc1>0 THEN
Put(hex(u.bc1))
FI
PrintHex2(u.bc2)
PrintHex2(u.bc3)
RETURN
PROC PrintArray(BYTE ARRAY a BYTE len)
BYTE i
Put('[)
FOR i=0 TO len-1
DO
IF i>0 THEN Put(32 )FI
PrintHex2(a(i))
OD
Put('])
RETURN
PROC Encode(Unicode POINTER u BYTE ARRAY buf BYTE POINTER len)
IF u.bc1>0 THEN
len^=4
buf(0)=$F0 % (u.bc1 RSH 2)
buf(1)=$80 % ((u.bc1 & $03) LSH 4) % (u.bc2 RSH 4)
buf(2)=$80 % ((u.bc2 & $0F) LSH 2) % (u.bc3 RSH 6)
buf(3)=$80 % (u.bc3 & $3F)
ELSEIF u.bc2>=$08 THEN
len^=3
buf(0)=$E0 % (u.bc2 RSH 4)
buf(1)=$80 % ((u.bc2 & $0F) LSH 2) % (u.bc3 RSH 6)
buf(2)=$80 % (u.bc3 & $3F)
ELSEIF u.bc2>0 OR u.bc3>=$80 THEN
len^=2
buf(0)=$C0 % (u.bc2 LSH 2) % (u.bc3 RSH 6)
buf(1)=$80 % (u.bc3 & $3F)
ELSE
len^=1
buf(0)=u.bc3
FI
RETURN
PROC Decode(BYTE ARRAY buf BYTE len Unicode POINTER u)
IF len=1 THEN
u.bc1=0
u.bc2=0
u.bc3=buf(0)
ELSEIF len=2 THEN
u.bc1=0
u.bc2=(buf(0) & $1F) RSH 2
u.bc3=(buf(0) LSH 6) % (buf(1) & $3F)
ELSEIF len=3 THEN
u.bc1=0
u.bc2=(buf(0) LSH 4) % ((buf(1) & $3F) RSH 2)
u.bc3=(buf(1) LSH 6) % (buf(2) & $3F)
ELSEIF len=4 THEN
u.bc1=((buf(0) & $07) LSH 2) % ((buf(1) & $3F) RSH 4)
u.bc2=(buf(1) LSH 4) % ((buf(2) & $3F) RSH 2)
u.bc3=((buf(2) & $03) LSH 6) % (buf(3) & $3F)
ELSE
Break()
FI
RETURN
PROC Main()
DEFINE PTR="CARD"
DEFINE COUNT="11"
PTR ARRAY case(COUNT)
Unicode uni,res
BYTE ARRAY buf(4)
BYTE i,len
case(0)="U+0041"
case(1)="U+00F6"
case(2)="U+0416"
case(3)="U+20AC"
case(4)="U+1D11E"
case(5)="U+0024"
case(6)="U+00A2"
case(7)="U+0939"
case(8)="U+20AC"
case(9)="U+D55C"
case(10)="U+10348"
FOR i=0 TO COUNT-1
DO
IF i=0 THEN
PrintE("From RosettaCode:")
ELSEIF i=5 THEN
PutE() PrintE("From Wikipedia:")
FI
ValUnicode(case(i),uni)
Encode(uni,buf,@len)
Decode(buf,len,res)
StrUnicode(uni) Print(" -> ")
PrintArray(buf,len) Print(" -> ")
StrUnicode(res) PutE()
OD
RETURN</lang>
{{out}}
[https://gitlab.com/amarok8bit/action-rosetta-code/-/raw/master/images/UTF-8_encode_and_decode.png Screenshot from Atari 8-bit computer]
<pre>
From RosettaCode:
U+0041 -> [41] -> U+0041
U+00F6 -> [C3 B6] -> U+00F6
U+0416 -> [D0 96] -> U+0416
U+20AC -> [E2 82 AC] -> U+20AC
U+1D11E -> [F0 9D 84 9E] -> U+1D11E
From Wikipedia:
U+0024 -> [24] -> U+0024
U+00A2 -> [C2 A2] -> U+00A2
U+0939 -> [E0 A4 B9] -> U+0939
U+20AC -> [E2 82 AC] -> U+20AC
U+D55C -> [ED 95 9C] -> U+D55C
U+10348 -> [F0 90 8D 88] -> U+10348
</pre>
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