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tohex(c: int): int
{
if(c > 9)
return c-10+'A';
return c+'0';
}
fromhex(ex: ref Exec, c1: int, c2: int): int
{
c1 = hexdigit(c1);
c2 = hexdigit(c2);
if(c1 < 0 || c2 < 0)
runtime(ex, URIError, "bad hex digit");
return 16*c1+c2;
}
isres(c: int): int
{
return c == ';' || c == '/' || c == '?' || c == ':' || c == '@' || c == '&' || c == '=' || c == '+' || c == '$' || c == ',' || c == '#'; # add '#' here for convenience
}
isunesc(c: int): int
{
return isalpha(c) || isdigit(c) || c == '-' || c == '_' || c == '.' || c == '!' || c == '~' || c == '*' || c == ''' || c == '(' || c == ')';
}
encode(ex: ref Exec, s: string, flag: int): string
{
m := len s;
r := "";
n := len r;
for(k := 0; k < m; k++){
c := s[k];
if(isunesc(c) || (flag && isres(c)))
r[n++] = c;
else{
if(c >= 16rdc00 && c <= 16rdfff)
runtime(ex, URIError, "char out of range");
if(c < 16rd800 || c > 16rdbff)
;
else{
if(++k == m)
runtime(ex, URIError, "char missing");
if(s[k] < 16rdc00 || s[k] > 16rdfff)
runtime(ex, URIError, "char out of range");
c = (c-16rd800)*16r400 + (s[k]-16rdc00) + 16r10000;
}
s1 := "Z";
s1[0] = c;
o := array of byte s1;
for(j := 0; j < len o; j++){
r += sys->sprint("%%%c%c", tohex(int o[j]/16), tohex(int o[j]%16));
n += 3;
}
}
}
return r;
}
decode(ex: ref Exec, s: string, flag: int): string
{
m := len s;
r := "";
n := len r;
for(k := 0; k < m; k++){
c := s[k];
if(c != '%')
r[n++] = c;
else{
start := k;
if(k+2 >= m)
runtime(ex, URIError, "char missing");
c = fromhex(ex, s[k+1], s[k+2]);
k += 2;
if((c&16r80 == 0)){
if(flag && isres(c)){
r += s[start: k+1];
n += k+1-start;
}
else
r[n++] = c;
}
else{
for(i := 1; ((c<<i)&16r80) == 0; i++)
;
if(i == 1 || i > 4)
runtime(ex, URIError, "bad hex number");
o := array[i] of byte;
o[0] = byte c;
if(k+3*(n-1) >= m)
runtime(ex, URIError, "char missing");
for(j := 1; j < i; j++){
if(s[++k] != '%')
runtime(ex, URIError, "% missing");
c = fromhex(ex, s[k+1], s[k+2]);
k += 2;
if((c&16rc0) != 2)
runtime(ex, URIError, "bad hex number");
o[j] = byte c;
}
(c, nil, nil) = sys->byte2char(o, 0);
if(c < 16r10000){
if(flag && isres(c)){
r += s[start: k+1];
n += k+1-start;
}
else
r[n++] = c;
}
else if(c > 16r10ffff)
runtime(ex, URIError, "bad byte sequence");
else{
r[n++] = ((c-16r10000)&16r3ff)+16rdc00;
r[n++] = (((c-16r10000)>>10)&16r3ff)+16rd800;
}
}
}
}
return r;
}
cdecodeuri(ex: ref Exec, nil, nil: ref Ecmascript->Obj, args: array of ref Val): ref Val
{
return strval(decode(ex, toString(ex, biarg(args, 0)), 1));
}
cdecodeuric(ex: ref Exec, nil, nil: ref Ecmascript->Obj, args: array of ref Val): ref Val
{
return strval(decode(ex, toString(ex, biarg(args, 0)), 0));
}
cencodeuri(ex: ref Exec, nil, nil: ref Ecmascript->Obj, args: array of ref Val): ref Val
{
return strval(encode(ex, toString(ex, biarg(args, 0)), 1));
}
cencodeuric(ex: ref Exec, nil, nil: ref Ecmascript->Obj, args: array of ref Val): ref Val
{
return strval(encode(ex, toString(ex, biarg(args, 0)), 0));
}
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