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#include <fitz.h>
typedef struct fz_a85e_s fz_a85e;
struct fz_a85e_s
{
fz_filter super;
int c;
};
fz_error *
fz_newa85e(fz_filter **fp, fz_obj *params)
{
FZ_NEWFILTER(fz_a85e, f, a85e);
f->c = 0;
return nil;
}
void
fz_dropa85e(fz_filter *f)
{
}
fz_error *
fz_processa85e(fz_filter *filter, fz_buffer *in, fz_buffer *out)
{
fz_a85e *f = (fz_a85e*)filter;
unsigned long word;
int count;
int n;
n = 0;
while (1)
{
if (f->c >= 70) {
if (out->wp + 1 > out->ep)
return fz_ioneedout;
*out->wp++ = '\n';
f->c = 0;
n ++;
}
if (in->rp + 4 <= in->wp)
{
word = (in->rp[0] << 24) |
(in->rp[1] << 16) |
(in->rp[2] << 8) |
(in->rp[3]);
if (word == 0) {
if (out->wp + 1 > out->ep)
return fz_ioneedout;
*out->wp++ = 'z';
f->c ++;
n ++;
}
else {
unsigned long v1, v2, v3, v4;
if (out->wp + 5 > out->ep)
return fz_ioneedout;
v4 = word / 85;
v3 = v4 / 85;
v2 = v3 / 85;
v1 = v2 / 85;
*out->wp++ = (v1 % 85) + '!';
*out->wp++ = (v2 % 85) + '!';
*out->wp++ = (v3 % 85) + '!';
*out->wp++ = (v4 % 85) + '!';
*out->wp++ = (word % 85) + '!';
f->c += 5;
n += 5;
}
in->rp += 4;
}
else if (in->eof)
{
unsigned long divisor;
if (in->rp == in->wp)
goto needinput; /* handle clean eof here */
count = in->wp - in->rp;
if (out->wp + count + 3 > out->ep)
return fz_ioneedout;
word = 0;
switch (count) {
case 3: word |= in->rp[2] << 8;
case 2: word |= in->rp[1] << 16;
case 1: word |= in->rp[0] << 24;
}
in->rp += count;
divisor = 85L * 85 * 85 * 85;
while (count-- >= 0) {
*out->wp++ = ((word / divisor) % 85) + '!';
divisor /= 85;
}
*out->wp++ = '~';
*out->wp++ = '>';
out->eof = 1;
return fz_iodone;
}
else {
goto needinput;
}
}
needinput:
if (in->eof) {
if (out->wp + 2 > out->ep)
return fz_ioneedout;
*out->wp++ = '~';
*out->wp++ = '>';
out->eof = 1;
return fz_iodone;
}
return fz_ioneedin;
}
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