/*
* Check if an object is a stream or not.
*/
int
pdf_is_stream(pdf_document *xref, int num, int gen)
{
if (num < 0 || num >= xref->len)
return 0;
pdf_cache_object(xref, num, gen);
/* RJW: "cannot load object, ignoring error" */
return xref->table[num].stm_ofs > 0;
}
/*
* Check if an object is a stream or not.
*/
int
pdf_is_stream(fz_context *ctx, pdf_document *doc, int num, int gen)
{
pdf_xref_entry *entry;
if (num <= 0 || num >= pdf_xref_len(ctx, doc))
return 0;
entry = pdf_cache_object(ctx, doc, num, gen);
return entry->stm_ofs != 0 || entry->stm_buf;
}
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);
}
static fz_stream *
pdf_open_image_stream(fz_context *ctx, pdf_document *doc, int num, int gen, int orig_num, int orig_gen, fz_compression_params *params)
{
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 && x->stm_buf == NULL)
fz_throw(ctx, FZ_ERROR_GENERIC, "object is not a stream");
return pdf_open_filter(ctx, doc, doc->file, x->obj, orig_num, orig_gen, x->stm_ofs, params);
}
fz_error
pdf_load_object(fz_obj **objp, pdf_xref *xref, int num, int gen)
{
fz_error error;
error = pdf_cache_object(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_keep_obj(xref->table[num].obj);
return fz_okay;
}
/*
* Check if an object is a stream or not.
*/
int
pdf_is_stream(pdf_xref *xref, int num, int gen)
{
fz_error error;
if (num < 0 || num >= xref->len)
return 0;
error = pdf_cache_object(xref, num, gen);
if (error)
{
fz_catch(error, "cannot load object, ignoring error");
return 0;
}
return xref->table[num].stm_ofs > 0;
}
fz_stream *
pdf_open_image_stream(pdf_document *xref, int num, int gen, int orig_num, int orig_gen, pdf_image_params *params)
{
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 && x->stm_buf == NULL)
fz_throw(xref->ctx, "object is not a stream");
return pdf_open_filter(xref->file, xref, x->obj, orig_num, orig_gen, x->stm_ofs, params);
}
fz_obj *
pdf_resolve_indirect(fz_obj *ref)
{
if (fz_is_indirect(ref))
{
pdf_xref *xref = fz_get_indirect_xref(ref);
int num = fz_to_num(ref);
int gen = fz_to_gen(ref);
if (xref)
{
fz_error error = pdf_cache_object(xref, num, gen);
if (error)
{
fz_catch(error, "cannot load object (%d %d R) into cache", num, gen);
return ref;
}
if (xref->table[num].obj)
return xref->table[num].obj;
}
}
return ref;
}
/*
* 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 uncompressed data.
* Put the opened file in xref->stream.
* Using xref->file while a stream is open is a Bad idea.
*/
fz_error
pdf_open_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_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");
}
