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implement Stob;
include "sys.m";
include "convcs.m";
sys : Sys;
map : array of byte;
ERRCHAR : con 16rFFFD;
init(arg : string) : string
{
sys = load Sys Sys->PATH;
if (arg == nil)
return "codepage path required";
fd := sys->open(arg, Sys->OREAD);
if (fd == nil)
return sys->sprint("%s: %r", arg);
buf := array[Sys->UTFmax * 256] of byte;
nread := 0;
for (;nread < len buf;) {
toread := len buf - nread;
n := sys->read(fd, buf[nread:], toread);
if (n <= 0)
break;
nread += n;
}
codepage := string buf[0:nread];
if (len codepage != 256) {
codepage = nil;
return sys->sprint("%s: bad codepage", arg);
}
buf = nil;
map = array[16r10000] of { * => byte '?' };
for (i := 0; i < 256; i++)
map[codepage[i]] = byte i;
return nil;
}
stob(nil : Convcs->State, str : string) : (Convcs->State, array of byte)
{
b := array [len str] of byte;
n := len str;
for (i := 0; i < n; i++)
b[i] = map[str[i]];
return (nil, b);
}
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