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implement Btos;
include "sys.m";
include "convcs.m";
GBMAX : con 8795;
GBDATA : con "/lib/convcs/gb2312";
MAXINT : con 16r7fffffff;
BADCHAR : con 16rFFFD;
gbmap := "";
init(nil : string): string
{
sys := load Sys Sys->PATH;
fd := sys->open(GBDATA, Sys->OREAD);
if (fd == nil)
return sys->sprint("%s: %r", GBDATA);
buf := array[GBMAX * Sys->UTFmax] of byte;
nread := 0;
for (;nread < len buf;) {
n := sys->read(fd, buf[nread:], Sys->ATOMICIO);
if (n <= 0)
break;
nread += n;
}
gbmap = string buf[:nread];
if (len gbmap != GBMAX) {
gbmap = nil;
return sys->sprint("%s: corrupt data", GBDATA);
}
return nil;
}
btos(nil : Convcs->State, b : array of byte, n : int) : (Convcs->State, string, int)
{
nbytes := 0;
str := "";
if (n == -1)
n = MAXINT;
font := -1;
for (i := 0; i < len b && len str < n; i++) {
c := int b[i];
ch := Sys->UTFerror;
if (font == -1) {
# idle state
if (c >= 16rA1) {
font = c;
continue;
}
ch = c;
} else {
# seen a font spec
if (c >= 16rA1) {
ix := (font - 16rA0)*100 + (c-16rA0);
ch = gbmap[ix];
}
font = -1;
}
str[len str] = ch;
nbytes = i + 1;
}
return (nil, str, nbytes);
}
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