/*
* Build a filter for reading raw stream data.
* This is a null filter to constrain reading to the
* stream length, followed by a decryption filter.
*/
static fz_stream *
pdf_open_raw_filter(fz_stream *chain, pdf_document *xref, pdf_obj *stmobj, int num, int gen)
{
int hascrypt;
int len;
fz_context *ctx = chain->ctx;
/* don't close chain when we close this filter */
fz_keep_stream(chain);
len = pdf_to_int(pdf_dict_gets(stmobj, "Length"));
chain = fz_open_null(chain, len);
fz_try(ctx)
{
hascrypt = pdf_stream_has_crypt(ctx, stmobj);
if (xref->crypt && !hascrypt)
chain = pdf_open_crypt(chain, xref->crypt, num, gen);
}
fz_catch(ctx)
{
fz_close(chain);
fz_rethrow(ctx);
}
return chain;
}
/*
* Build a filter for reading raw stream data.
* This is a null filter to constrain reading to the stream length (and to
* allow for other people accessing the file), followed by a decryption
* filter.
*
* orig_num and orig_gen are used purely to seed the encryption.
*/
static fz_stream *
pdf_open_raw_filter(fz_context *ctx, fz_stream *chain, pdf_document *doc, pdf_obj *stmobj, int num, int *orig_num, int *orig_gen, fz_off_t offset)
{
pdf_xref_entry *x = NULL;
int hascrypt;
int len;
if (num > 0 && num < pdf_xref_len(ctx, doc))
{
x = pdf_get_xref_entry(ctx, doc, num);
*orig_num = x->num;
*orig_gen = x->gen;
if (x->stm_buf)
return fz_open_buffer(ctx, x->stm_buf);
}
else
{
/* We only end up here when called from pdf_open_stream_with_offset to parse new format XRef sections. */
/* New style XRef sections must have generation number 0. */
*orig_num = num;
*orig_gen = 0;
}
/* don't close chain when we close this filter */
fz_keep_stream(ctx, chain);
len = pdf_to_int(ctx, pdf_dict_get(ctx, stmobj, PDF_NAME_Length));
chain = fz_open_null(ctx, chain, len, offset);
hascrypt = pdf_stream_has_crypt(ctx, stmobj);
if (doc->crypt && !hascrypt)
chain = pdf_open_crypt(ctx, chain, doc->crypt, *orig_num, *orig_gen);
return chain;
}
/*
* Build a filter for reading raw stream data.
* This is a null filter to constrain reading to the stream length (and to
* allow for other people accessing the file), followed by a decryption
* filter.
*
* orig_num and orig_gen are used purely to seed the encryption.
*/
static fz_stream *
pdf_open_raw_filter(fz_context *ctx, fz_stream *chain, pdf_document *doc, pdf_obj *stmobj, int num, int orig_num, int orig_gen, int offset)
{
int hascrypt;
int len;
if (num > 0 && num < pdf_xref_len(ctx, doc))
{
pdf_xref_entry *entry = pdf_get_xref_entry(ctx, doc, num);
if (entry->stm_buf)
return fz_open_buffer(ctx, entry->stm_buf);
}
/* don't close chain when we close this filter */
fz_keep_stream(ctx, chain);
len = pdf_to_int(ctx, pdf_dict_get(ctx, stmobj, PDF_NAME_Length));
chain = fz_open_null(ctx, chain, len, offset);
hascrypt = pdf_stream_has_crypt(ctx, stmobj);
if (doc->crypt && !hascrypt)
chain = pdf_open_crypt(ctx, chain, doc->crypt, orig_num, orig_gen);
return chain;
}
/*
* Build a filter for reading raw stream data.
* This is a null filter to constrain reading to the
* stream length, followed by a decryption filter.
*/
static fz_stream *
pdf_open_raw_filter(fz_stream *chain, pdf_xref *xref, fz_obj *stmobj, int num, int gen)
{
int hascrypt;
int len;
/* don't close chain when we close this filter */
fz_keep_stream(chain);
len = fz_to_int(fz_dict_gets(stmobj, "Length"));
chain = fz_open_null(chain, len);
hascrypt = pdf_stream_has_crypt(stmobj);
if (xref->crypt && !hascrypt)
chain = pdf_open_crypt(chain, xref->crypt, num, gen);
return chain;
}
