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#include "fitz-base.h"
#include "fitz-stream.h"
typedef struct fz_a85d_s fz_a85d;
struct fz_a85d_s
{
fz_filter super;
unsigned long word;
int count;
};
static inline int iswhite(int a)
{
switch (a) {
case '\n': case '\r': case '\t': case ' ':
case '\0': case '\f': case '\b': case 0177:
return 1;
}
return 0;
}
fz_error *
fz_newa85d(fz_filter **fp, fz_obj *params)
{
FZ_NEWFILTER(fz_a85d, f, a85d);
f->word = 0;
f->count = 0;
return nil;
}
void
fz_dropa85d(fz_filter *f)
{
}
fz_error *
fz_processa85d(fz_filter *filter, fz_buffer *in, fz_buffer *out)
{
fz_a85d *f = (fz_a85d*)filter;
int c;
while (1)
{
if (in->rp == in->wp)
return fz_ioneedin;
c = *in->rp++;
if (c >= '!' && c <= 'u') {
if (f->count == 4) {
if (out->wp + 4 > out->ep) {
in->rp --;
return fz_ioneedout;
}
f->word = f->word * 85 + (c - '!');
*out->wp++ = (f->word >> 24) & 0xff;
*out->wp++ = (f->word >> 16) & 0xff;
*out->wp++ = (f->word >> 8) & 0xff;
*out->wp++ = (f->word) & 0xff;
f->word = 0;
f->count = 0;
}
else {
f->word = f->word * 85 + (c - '!');
f->count ++;
}
}
else if (c == 'z' && f->count == 0) {
if (out->wp + 4 > out->ep) {
in->rp --;
return fz_ioneedout;
}
*out->wp++ = 0;
*out->wp++ = 0;
*out->wp++ = 0;
*out->wp++ = 0;
}
else if (c == '~') {
if (in->rp == in->wp) {
in->rp --;
return fz_ioneedin;
}
c = *in->rp++;
if (c != '>') {
return fz_throw("ioerror: bad eod marker in a85d");
}
if (out->wp + f->count - 1 > out->ep) {
in->rp -= 2;
return fz_ioneedout;
}
switch (f->count) {
case 0:
break;
case 1:
return fz_throw("ioerror: partial final byte in a85d");
case 2:
f->word = f->word * (85L * 85 * 85) + 0xffffffL;
goto o1;
case 3:
f->word = f->word * (85L * 85) + 0xffffL;
goto o2;
case 4:
f->word = f->word * 85 + 0xffL;
*(out->wp+2) = f->word >> 8;
o2: *(out->wp+1) = f->word >> 16;
o1: *(out->wp+0) = f->word >> 24;
out->wp += f->count - 1;
break;
}
out->eof = 1;
return fz_iodone;
}
else if (!iswhite(c)) {
return fz_throw("ioerror: bad data in a85d: '%c'", c);
}
}
}
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