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#ifdef PLAN9
#include <u.h>
#include <libc.h>
#include <bio.h>
#else
#include <stdio.h>
#include <unistd.h>
#include "plan9.h"
#endif
#include "hdr.h"
#include "conv.h"
#include "gb.h"
/*
a state machine for interpreting gb.
*/
void
gbproc(int c, Rune **r, long input_loc)
{
static enum { state0, state1 } state = state0;
static int lastc;
long n, ch, cold = c;
again:
switch(state)
{
case state0: /* idle state */
if(c < 0)
return;
if(c >= 0xA1){
lastc = c;
state = state1;
return;
}
emit(c);
return;
case state1: /* seen a font spec */
if(c >= 0xA1)
n = (lastc-0xA0)*100 + (c-0xA0);
else {
nerrors++;
if(squawk)
EPR "%s: bad gb glyph %d (from 0x%x,0x%x) near byte %ld in %s\n", argv0, c-0xA0, lastc, cold, input_loc, file);
if(!clean)
emit(BADMAP);
state = state0;
return;
}
ch = tabgb[n];
if(ch < 0){
nerrors++;
if(squawk)
EPR "%s: unknown gb %d (from 0x%x,0x%x) near byte %ld in %s\n", argv0, n, lastc, cold, input_loc, file);
if(!clean)
emit(BADMAP);
} else
emit(ch);
state = state0;
}
}
void
gb_in(int fd, long *notused, struct convert *out)
{
Rune ob[N];
Rune *r, *re;
uchar ibuf[N];
int n, i;
long nin;
USED(notused);
r = ob;
re = ob+N-3;
nin = 0;
while((n = read(fd, ibuf, sizeof ibuf)) > 0){
for(i = 0; i < n; i++){
gbproc(ibuf[i], &r, nin++);
if(r >= re){
OUT(out, ob, r-ob);
r = ob;
}
}
if(r > ob){
OUT(out, ob, r-ob);
r = ob;
}
}
gbproc(-1, &r, nin);
if(r > ob)
OUT(out, ob, r-ob);
}
void
gb_out(Rune *base, int n, long *notused)
{
char *p;
int i;
Rune r;
static int first = 1;
USED(notused);
if(first){
first = 0;
for(i = 0; i < NRUNE; i++)
tab[i] = -1;
for(i = 0; i < GBMAX; i++)
if(tabgb[i] != -1)
tab[tabgb[i]] = i;
}
nrunes += n;
p = obuf;
for(i = 0; i < n; i++){
r = base[i];
if(r < 128)
*p++ = r;
else {
if(tab[r] != -1){
r = tab[r];
*p++ = 0xA0 + (r/100);
*p++ = 0xA0 + (r%100);
continue;
}
if(squawk)
EPR "%s: rune 0x%x not in output cs\n", argv0, r);
nerrors++;
if(clean)
continue;
*p++ = BYTEBADMAP;
}
}
noutput += p-obuf;
if(p > obuf)
write(1, obuf, p-obuf);
}
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