fz_stream *
pdf_open_raw_renumbered_stream(fz_context *ctx, pdf_document *doc, int num, int gen, int orig_num, int orig_gen)
{
pdf_xref_entry *x;
if (num <= 0 || num >= pdf_xref_len(ctx, doc))
fz_throw(ctx, FZ_ERROR_GENERIC, "object id out of range (%d %d R)", num, gen);
x = pdf_cache_object(ctx, doc, num, gen);
if (x->stm_ofs == 0)
fz_throw(ctx, FZ_ERROR_GENERIC, "object is not a stream");
return pdf_open_raw_filter(ctx, doc->file, doc, x->obj, num, orig_num, orig_gen, x->stm_ofs);
}
/*
* Construct a filter to decode a stream, constraining
* to stream length and decrypting.
*/
static fz_stream *
pdf_open_filter(fz_stream *chain, pdf_xref *xref, fz_obj *stmobj, int num, int gen)
{
fz_obj *filters;
fz_obj *params;
filters = fz_dict_getsa(stmobj, "Filter", "F");
params = fz_dict_getsa(stmobj, "DecodeParms", "DP");
chain = pdf_open_raw_filter(chain, xref, stmobj, num, gen);
if (fz_is_name(filters))
return build_filter(chain, xref, filters, params, num, gen);
if (fz_array_len(filters) > 0)
return build_filter_chain(chain, xref, filters, params, num, gen);
return chain;
}
fz_stream *
pdf_open_raw_renumbered_stream(pdf_document *xref, int num, int gen, int orig_num, int orig_gen)
{
pdf_xref_entry *x;
if (num < 0 || num >= xref->len)
fz_throw(xref->ctx, "object id out of range (%d %d R)", num, gen);
x = xref->table + num;
pdf_cache_object(xref, num, gen);
/* RJW: "cannot load stream object (%d %d R)", num, gen */
if (x->stm_ofs == 0)
fz_throw(xref->ctx, "object is not a stream");
return pdf_open_raw_filter(xref->file, xref, x->obj, orig_num, orig_gen, x->stm_ofs);
}
/*
* Construct a filter to decode a stream, constraining
* to stream length and decrypting.
*/
static fz_stream *
pdf_open_filter(fz_stream *chain, pdf_document *xref, pdf_obj *stmobj, int num, int gen, int offset, pdf_image_params *imparams)
{
pdf_obj *filters;
pdf_obj *params;
filters = pdf_dict_getsa(stmobj, "Filter", "F");
params = pdf_dict_getsa(stmobj, "DecodeParms", "DP");
chain = pdf_open_raw_filter(chain, xref, stmobj, num, gen, offset);
if (pdf_is_name(filters))
chain = build_filter(chain, xref, filters, params, num, gen, imparams);
else if (pdf_array_len(filters) > 0)
chain = build_filter_chain(chain, xref, filters, params, num, gen, imparams);
return chain;
}
/*
* Construct a filter to decode a stream, constraining
* to stream length and decrypting.
*/
static fz_stream *
pdf_open_filter(fz_context *ctx, pdf_document *doc, fz_stream *chain, pdf_obj *stmobj, int num, fz_off_t offset, fz_compression_params *imparams)
{
pdf_obj *filters;
pdf_obj *params;
int orig_num, orig_gen;
filters = pdf_dict_geta(ctx, stmobj, PDF_NAME_Filter, PDF_NAME_F);
params = pdf_dict_geta(ctx, stmobj, PDF_NAME_DecodeParms, PDF_NAME_DP);
chain = pdf_open_raw_filter(ctx, chain, doc, stmobj, num, &orig_num, &orig_gen, offset);
fz_var(chain);
fz_try(ctx)
{
if (pdf_is_name(ctx, filters))
{
fz_stream *chain2 = chain;
chain = NULL;
chain = build_filter(ctx, chain2, doc, filters, params, orig_num, orig_gen, imparams);
}
else if (pdf_array_len(ctx, filters) > 0)
{
fz_stream *chain2 = chain;
chain = NULL;
chain = build_filter_chain(ctx, chain2, doc, filters, params, orig_num, orig_gen, imparams);
}
}
fz_catch(ctx)
{
fz_drop_stream(ctx, chain);
fz_rethrow(ctx);
}
return chain;
}
/*
* Open a stream for reading the raw (compressed but decrypted) data.
* Using xref->file while this is open is a bad idea.
*/
fz_stream *
pdf_open_raw_stream(pdf_document *xref, int num, int gen)
{
pdf_xref_entry *x;
fz_stream *stm;
fz_var(x);
if (num < 0 || num >= xref->len)
fz_throw(xref->ctx, "object id out of range (%d %d R)", num, gen);
x = xref->table + num;
pdf_cache_object(xref, num, gen);
/* RJW: "cannot load stream object (%d %d R)", num, gen */
if (x->stm_ofs == 0)
fz_throw(xref->ctx, "object is not a stream");
stm = pdf_open_raw_filter(xref->file, xref, x->obj, num, gen);
fz_lock_stream(stm);
fz_seek(xref->file, x->stm_ofs, 0);
return stm;
}
/*
* 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_open_raw_stream(fz_stream **stmp, pdf_xref *xref, int num, int gen)
{
pdf_xref_entry *x;
fz_error error;
if (num < 0 || num >= xref->len)
return fz_throw("object id out of range (%d %d R)", num, gen);
x = xref->table + num;
error = pdf_cache_object(xref, num, gen);
if (error)
return fz_rethrow(error, "cannot load stream object (%d %d R)", num, gen);
if (x->stm_ofs)
{
*stmp = pdf_open_raw_filter(xref->file, xref, x->obj, num, gen);
fz_seek(xref->file, x->stm_ofs, 0);
return fz_okay;
}
return fz_throw("object is not a stream");
}
