static fz_error *
writeobject(fz_stream *out, pdf_xref *xref, pdf_crypt *encrypt, int oid, int gen)
{
pdf_xrefentry *x = xref->table + oid;
fz_error *error;
error = pdf_cacheobject(xref, oid, gen);
if (error)
return error;
if (encrypt)
pdf_cryptobj(encrypt, x->obj, oid, gen);
fz_print(out, "%d %d obj\n", oid, gen);
fz_printobj(out, x->obj, TIGHT);
fz_print(out, "\n");
if (encrypt)
pdf_cryptobj(encrypt, x->obj, oid, gen);
if (pdf_isstream(xref, oid, gen))
{
error = writestream(out, xref, encrypt, oid, gen);
if (error)
return error;
}
fz_print(out, "endobj\n\n");
return nil;
}
/*
* 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");
}
fz_error
pdf_loadobject(fz_obj **objp, pdf_xref *xref, int num, int gen)
{
fz_error error;
error = pdf_cacheobject(xref, num, gen);
if (error)
return fz_rethrow(error, "cannot load object (%d %d R) into cache", num, gen);
assert(xref->table[num].obj);
*objp = fz_keepobj(xref->table[num].obj);
return fz_okay;
}
/*
* Check if an object is a stream or not.
*/
int
pdf_isstream(pdf_xref *xref, int oid, int gen)
{
fz_error *error;
if (oid < 0 || oid >= xref->len)
return 0;
error = pdf_cacheobject(xref, oid, gen);
if (error)
{
fz_warn("%s", error->msg);
fz_droperror(error);
return 0;
}
return xref->table[oid].stmbuf || xref->table[oid].stmofs;
}