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implement Btos;
include "sys.m";
include "convcs.m";
sys : Sys;
codepage : string;
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);
}
return nil;
}
btos(nil : Convcs->State, b : array of byte, n : int) : (Convcs->State, string, int)
{
s := "";
if (n == -1 || n > len b)
# consume all available characters
n = len b;
for (i := 0; i < n; i++)
s[len s] = codepage[int b[i]];
return (nil, s, n);
}
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