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#include "fitz_base.h"
#include "fitz_stream.h"
/* TODO: complete rewrite with error checking and use fitz memctx */
/*
<rillian> so to use a global_ctx, you run your global data through a normal ctx
<rillian> then call jbig2_make_global_ctx with the normal context
<rillian> that does the (currently null) conversion
<maskros> make_global_ctx after i fed it all the global stream data?
<rillian> maskros: yes
<rillian> and you pass the new global ctx object to jbig2_ctx_new() when you
+create the per-page ctx
*/
#ifdef WIN32 /* Microsoft Visual C++ */
typedef signed char int8_t;
typedef short int int16_t;
typedef int int32_t;
typedef __int64 int64_t;
typedef unsigned char uint8_t;
typedef unsigned short int uint16_t;
typedef unsigned int uint32_t;
#else
#include <inttypes.h>
#endif
#include <jbig2.h>
typedef struct fz_jbig2d_s fz_jbig2d;
struct fz_jbig2d_s
{
fz_filter super;
Jbig2Ctx *ctx;
Jbig2GlobalCtx *gctx;
Jbig2Image *page;
int idx;
};
fz_error *
fz_newjbig2d(fz_filter **fp, fz_obj *params)
{
FZ_NEWFILTER(fz_jbig2d, d, jbig2d);
d->ctx = jbig2_ctx_new(nil, JBIG2_OPTIONS_EMBEDDED, nil, nil, nil);
d->page = nil;
d->idx = 0;
return fz_okay;
}
void
fz_dropjbig2d(fz_filter *filter)
{
fz_jbig2d *d = (fz_jbig2d*)filter;
jbig2_ctx_free(d->ctx);
}
fz_error *
fz_setjbig2dglobalstream(fz_filter *filter, unsigned char *buf, int len)
{
fz_jbig2d *d = (fz_jbig2d*)filter;
jbig2_data_in(d->ctx, buf, len);
d->gctx = jbig2_make_global_ctx(d->ctx);
d->ctx = jbig2_ctx_new(nil, JBIG2_OPTIONS_EMBEDDED, d->gctx, nil, nil);
return fz_okay;
}
fz_error *
fz_processjbig2d(fz_filter *filter, fz_buffer *in, fz_buffer *out)
{
fz_jbig2d *d = (fz_jbig2d*)filter;
int len;
int i;
while (1)
{
if (in->rp == in->wp) {
if (!in->eof)
return fz_ioneedin;
if (!d->page) {
jbig2_complete_page(d->ctx);
d->page = jbig2_page_out(d->ctx);
}
if (out->wp == out->ep)
return fz_ioneedout;
len = out->ep - out->wp;
if (d->idx + len > d->page->height * d->page->stride)
len = d->page->height * d->page->stride - d->idx;
/* XXX memcpy(out->wp, d->page->data + d->idx, len); */
{
unsigned char * restrict in = &d->page->data[d->idx];
unsigned char * restrict o = out->wp;
for (i = 0; i < len; i++)
*o++ = 0xff ^ *in++;
}
out->wp += len;
d->idx += len;
if (d->idx == d->page->height * d->page->stride) {
jbig2_release_page(d->ctx, d->page);
return fz_iodone;
}
}
else {
len = in->wp - in->rp;
jbig2_data_in(d->ctx, in->rp, len);
in->rp += len;
}
}
}
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