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#include "fitz.h"
typedef struct fz_pipeline_s fz_pipeline;
fz_error fz_processpipeline(fz_filter *filter, fz_buffer *in, fz_buffer *out);
struct fz_pipeline_s
{
fz_filter super;
fz_filter *head;
fz_buffer *buffer;
fz_filter *tail;
int tailneedsin;
};
fz_filter *
fz_chainpipeline(fz_filter *head, fz_filter *tail, fz_buffer *buf)
{
FZ_NEWFILTER(fz_pipeline, p, pipeline);
p->head = fz_keepfilter(head);
p->tail = fz_keepfilter(tail);
p->tailneedsin = 1;
p->buffer = fz_keepbuffer(buf);
return (fz_filter*)p;
}
void
fz_unchainpipeline(fz_filter *filter, fz_filter **oldfp, fz_buffer **oldbp)
{
fz_pipeline *p = (fz_pipeline*)filter;
*oldfp = fz_keepfilter(p->head);
*oldbp = fz_keepbuffer(p->buffer);
fz_dropfilter(filter);
}
fz_filter *
fz_newpipeline(fz_filter *head, fz_filter *tail)
{
FZ_NEWFILTER(fz_pipeline, p, pipeline);
p->buffer = fz_newbuffer(FZ_BUFSIZE);
p->head = fz_keepfilter(head);
p->tail = fz_keepfilter(tail);
p->tailneedsin = 1;
return (fz_filter*)p;
}
void
fz_droppipeline(fz_filter *filter)
{
fz_pipeline *p = (fz_pipeline*)filter;
fz_dropfilter(p->head);
fz_dropfilter(p->tail);
fz_dropbuffer(p->buffer);
}
fz_error
fz_processpipeline(fz_filter *filter, fz_buffer *in, fz_buffer *out)
{
fz_pipeline *p = (fz_pipeline*)filter;
fz_error e;
if (p->buffer->eof)
goto tail;
if (p->tailneedsin && p->head->produced)
goto tail;
head:
e = fz_process(p->head, in, p->buffer);
if (e == fz_ioneedin)
return fz_ioneedin;
else if (e == fz_ioneedout)
{
if (p->tailneedsin && !p->head->produced)
{
if (p->buffer->rp > p->buffer->bp)
fz_rewindbuffer(p->buffer);
else
fz_growbuffer(p->buffer);
goto head;
}
goto tail;
}
else if (e == fz_iodone)
goto tail;
else if (e)
return fz_rethrow(e, "cannot process head filter");
else
return fz_okay;
tail:
e = fz_process(p->tail, p->buffer, out);
if (e == fz_ioneedin)
{
if (p->buffer->eof)
return fz_throw("ioerror: premature eof in pipeline");
p->tailneedsin = 1;
goto head;
}
else if (e == fz_ioneedout)
{
p->tailneedsin = 0;
return fz_ioneedout;
}
else if (e == fz_iodone)
{
/* The head may still contain end-of-data markers or garbage */
e = fz_process(p->head, in, p->buffer);
if (e != fz_iodone)
fz_catch(e, "head filter not done");
return fz_iodone;
}
else if (e)
return fz_rethrow(e, "cannot process tail filter");
else
return fz_okay;
}
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