static fz_buffer *
pdf_load_image_stream(fz_context *ctx, pdf_document *doc, int num, int gen, int orig_num, int orig_gen, fz_compression_params *params, int *truncated)
{
fz_stream *stm = NULL;
pdf_obj *dict, *obj;
int i, len, n;
fz_buffer *buf;
fz_var(buf);
if (num > 0 && num < pdf_xref_len(ctx, doc))
{
pdf_xref_entry *entry = pdf_get_xref_entry(ctx, doc, num);
/* Return ref to existing buffer, but only if uncompressed,
* or shortstoppable */
if (can_reuse_buffer(ctx, entry, params))
return fz_keep_buffer(ctx, entry->stm_buf);
}
dict = pdf_load_object(ctx, doc, num, gen);
len = pdf_to_int(ctx, pdf_dict_get(ctx, dict, PDF_NAME_Length));
obj = pdf_dict_get(ctx, dict, PDF_NAME_Filter);
len = pdf_guess_filter_length(len, pdf_to_name(ctx, obj));
n = pdf_array_len(ctx, obj);
for (i = 0; i < n; i++)
len = pdf_guess_filter_length(len, pdf_to_name(ctx, pdf_array_get(ctx, obj, i)));
pdf_drop_obj(ctx, dict);
stm = pdf_open_image_stream(ctx, doc, num, gen, orig_num, orig_gen, params);
fz_try(ctx)
{
if (truncated)
buf = fz_read_best(ctx, stm, len, truncated);
else
buf = fz_read_all(ctx, stm, len);
}
fz_always(ctx)
{
fz_drop_stream(ctx, stm);
}
fz_catch(ctx)
{
fz_rethrow_message(ctx, "cannot read raw stream (%d %d R)", num, gen);
}
return buf;
}
fz_buffer *
fz_read_all(fz_stream *stm, int initial)
{
return fz_read_best(stm, initial, NULL);
}
fz_buffer *
fz_read_all(fz_context *ctx, fz_stream *stm, int initial)
{
return fz_read_best(ctx, stm, initial, NULL);
}
