/*
* Open a stream for reading the raw (compressed but decrypted) data.
* Using xref->file while this is open is a bad idea.
*/
fz_error *
pdf_openrawstream(fz_stream **stmp, pdf_xref *xref, int oid, int gen)
{
pdf_xrefentry *x;
fz_error *error;
fz_filter *filter;
if (oid < 0 || oid >= xref->len)
return fz_throw("object id out of range (%d)", oid);
x = xref->table + oid;
error = pdf_cacheobject(xref, oid, gen);
if (error)
return fz_rethrow(error, "cannot load stream object (%d)", oid);
if (x->stmbuf)
{
error = fz_openrbuffer(stmp, x->stmbuf);
if (error)
return fz_rethrow(error, "cannot open stream from buffer");
return fz_okay;
}
if (x->stmofs)
{
error = buildrawfilter(&filter, xref, x->obj, oid, gen);
if (error)
return fz_rethrow(error, "cannot create raw filter");
error = fz_seek(xref->file, x->stmofs, 0);
if (error)
{
fz_dropfilter(filter);
return fz_rethrow(error, "cannot seek to stream");
}
error = fz_openrfilter(stmp, filter, xref->file);
fz_dropfilter(filter);
if (error)
return fz_rethrow(error, "cannot open filter stream");
return fz_okay;
}
return fz_throw("object is not a stream");
}
static fz_error *
writestream(fz_stream *out, pdf_xref *xref, pdf_crypt *encrypt, int oid, int gen)
{
fz_error *error;
fz_stream *dststm;
fz_stream *srcstm;
unsigned char buf[4096];
fz_filter *ef;
int n;
fz_print(out, "stream\n");
if (encrypt)
{
error = pdf_cryptstream(&ef, encrypt, oid, gen);
if (error)
return error;
error = fz_openrfilter(&dststm, ef, out);
fz_dropfilter(ef);
if (error)
return error;
}
else
{
dststm = fz_keepstream(out);
}
error = pdf_openrawstream(&srcstm, xref, oid, gen);
if (error)
goto cleanupdst;
while (1)
{
n = fz_read(srcstm, buf, sizeof buf);
if (n == 0)
break;
if (n < 0)
{
error = fz_ioerror(srcstm);
goto cleanupsrc;
}
n = fz_write(dststm, buf, n);
if (n < 0)
{
error = fz_ioerror(dststm);
goto cleanupsrc;
}
}
fz_dropstream(srcstm);
fz_dropstream(dststm);
fz_print(out, "endstream\n");
return nil;
cleanupsrc:
fz_dropstream(srcstm);
cleanupdst:
fz_dropstream(dststm);
return error;
}
fz_error *
pdf_loadinlineimage(pdf_image **imgp, pdf_xref *xref,
fz_obj *rdb, fz_obj *dict, fz_stream *file)
{
fz_error *error;
pdf_image *img;
fz_filter *filter;
fz_obj *f;
fz_obj *cs;
fz_obj *d;
int ismask;
int i;
img = fz_malloc(sizeof(pdf_image));
if (!img)
return fz_outofmem;
pdf_logimage("load inline image %p {\n", img);
img->super.loadtile = pdf_loadtile;
img->super.drop = pdf_dropimage;
img->super.n = 0;
img->super.a = 0;
img->super.refs = 0;
img->indexed = nil;
img->usecolorkey = 0;
img->mask = nil;
img->super.w = fz_toint(fz_dictgetsa(dict, "Width", "W"));
img->super.h = fz_toint(fz_dictgetsa(dict, "Height", "H"));
img->bpc = fz_toint(fz_dictgetsa(dict, "BitsPerComponent", "BPC"));
ismask = fz_tobool(fz_dictgetsa(dict, "ImageMask", "IM"));
d = fz_dictgetsa(dict, "Decode", "D");
cs = fz_dictgetsa(dict, "ColorSpace", "CS");
pdf_logimage("size %dx%d %d\n", img->super.w, img->super.h, img->bpc);
if (ismask)
{
pdf_logimage("is mask\n");
img->super.cs = nil;
img->super.n = 0;
img->super.a = 1;
img->bpc = 1;
}
if (cs)
{
img->super.cs = nil;
if (fz_isname(cs))
{
fz_obj *csd = fz_dictgets(rdb, "ColorSpace");
if (csd)
{
fz_obj *cso = fz_dictget(csd, cs);
img->super.cs = pdf_finditem(xref->store, PDF_KCOLORSPACE, cso);
if (img->super.cs)
fz_keepcolorspace(img->super.cs);
}
}
if (!img->super.cs)
{
/* XXX danger! danger! does this resolve? */
error = pdf_loadcolorspace(&img->super.cs, xref, cs);
if (error)
return error;
}
if (!strcmp(img->super.cs->name, "Indexed"))
{
pdf_logimage("indexed\n");
img->indexed = (pdf_indexed*)img->super.cs;
img->super.cs = img->indexed->base;
}
pdf_logimage("colorspace %s\n", img->super.cs->name);
img->super.n = img->super.cs->n;
img->super.a = 0;
}
if (fz_isarray(d))
{
pdf_logimage("decode array\n");
if (img->indexed)
for (i = 0; i < 2; i++)
img->decode[i] = fz_toreal(fz_arrayget(d, i));
else
for (i = 0; i < (img->super.n + img->super.a) * 2; i++)
img->decode[i] = fz_toreal(fz_arrayget(d, i));
}
else
{
if (img->indexed)
for (i = 0; i < 2; i++)
img->decode[i] = i & 1 ? (1 << img->bpc) - 1 : 0;
else
for (i = 0; i < (img->super.n + img->super.a) * 2; i++)
img->decode[i] = i & 1;
}
if (img->indexed)
img->stride = (img->super.w * img->bpc + 7) / 8;
else
img->stride = (img->super.w * (img->super.n + img->super.a) * img->bpc + 7) / 8;
/* load image data */
f = fz_dictgetsa(dict, "Filter", "F");
if (f)
{
fz_stream *tempfile;
error = pdf_buildinlinefilter(&filter, dict);
if (error)
return error;
error = fz_openrfilter(&tempfile, filter, file);
if (error)
return error;
i = fz_readall(&img->samples, tempfile);
if (i < 0)
return fz_ioerror(tempfile);
fz_dropfilter(filter);
fz_dropstream(tempfile);
}
else
{
error = fz_newbuffer(&img->samples, img->super.h * img->stride);
if (error)
return error;
i = fz_read(file, img->samples->bp, img->super.h * img->stride);
if (i < 0)
return fz_ioerror(file);
img->samples->wp += img->super.h * img->stride;
}
/* 0 means opaque and 1 means transparent, so we invert to get alpha */
if (ismask)
{
unsigned char *p;
for (p = img->samples->bp; p < img->samples->ep; p++)
*p = ~*p;
}
pdf_logimage("}\n");
*imgp = img;
return nil;
}