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-rw-r--r--source/pdf/pdf-graft.c150
1 files changed, 78 insertions, 72 deletions
diff --git a/source/pdf/pdf-graft.c b/source/pdf/pdf-graft.c
index d2276ccc..d6c53676 100644
--- a/source/pdf/pdf-graft.c
+++ b/source/pdf/pdf-graft.c
@@ -6,27 +6,18 @@ struct pdf_graft_map_s
int refs;
int len;
pdf_document *src;
+ pdf_document *dst;
int *dst_from_src;
};
pdf_graft_map *
-pdf_new_graft_map(fz_context *ctx, pdf_document *src)
+pdf_new_graft_map(fz_context *ctx, pdf_document *dst)
{
pdf_graft_map *map = NULL;
map = fz_malloc_struct(ctx, pdf_graft_map);
- fz_try(ctx)
- {
- map->src = (pdf_document*) fz_keep_document(ctx, (fz_document*)src);
- map->len = pdf_xref_len(ctx, src);
- map->dst_from_src = fz_calloc(ctx, map->len, sizeof(int));
- }
- fz_catch(ctx)
- {
- fz_free(ctx, map);
- fz_rethrow(ctx);
- }
+ map->dst = pdf_keep_document(ctx, dst);
map->refs = 1;
return map;
}
@@ -42,7 +33,8 @@ pdf_drop_graft_map(fz_context *ctx, pdf_graft_map *map)
{
if (fz_drop_imp(ctx, map, &map->refs))
{
- fz_drop_document(ctx, &map->src->super);
+ pdf_drop_document(ctx, map->src);
+ pdf_drop_document(ctx, map->dst);
fz_free(ctx, map->dst_from_src);
fz_free(ctx, map);
}
@@ -50,48 +42,77 @@ pdf_drop_graft_map(fz_context *ctx, pdf_graft_map *map)
/* Graft object from dst to source */
pdf_obj *
-pdf_graft_object(fz_context *ctx, pdf_document *dst, pdf_document *src, pdf_obj *obj_ref, pdf_graft_map *map)
+pdf_graft_object(fz_context *ctx, pdf_document *dst, pdf_obj *obj)
+{
+ pdf_document *src;
+ pdf_graft_map *map;
+
+ /* Primitive objects are not bound to a document, so can be re-used as is. */
+ src = pdf_get_bound_document(ctx, obj);
+ if (src == NULL)
+ return pdf_keep_obj(ctx, obj);
+
+ map = pdf_new_graft_map(ctx, dst);
+
+ fz_try(ctx)
+ obj = pdf_graft_mapped_object(ctx, map, obj);
+ fz_always(ctx)
+ pdf_drop_graft_map(ctx, map);
+ fz_catch(ctx)
+ fz_rethrow(ctx);
+
+ return obj;
+}
+
+pdf_obj *
+pdf_graft_mapped_object(fz_context *ctx, pdf_graft_map *map, pdf_obj *obj)
{
pdf_obj *val, *key;
pdf_obj *new_obj = NULL;
- pdf_obj *new_dict = NULL;
- pdf_obj *new_array = NULL;
+ pdf_obj *new_dict;
+ pdf_obj *new_array;
pdf_obj *ref = NULL;
fz_buffer *buffer = NULL;
- pdf_graft_map *drop_map = NULL;
- pdf_document *bound;
+ pdf_document *src;
int new_num, src_num, len, i;
/* Primitive objects are not bound to a document, so can be re-used as is. */
- if (!pdf_is_indirect(ctx, obj_ref) && !pdf_is_dict(ctx, obj_ref) && !pdf_is_array(ctx, obj_ref))
- return pdf_keep_obj(ctx, obj_ref);
-
- if (map == NULL)
- drop_map = map = pdf_new_graft_map(ctx, src);
- else if (src != map->src)
- fz_throw(ctx, FZ_ERROR_GENERIC, "graft map does not belong to the source document");
+ src = pdf_get_bound_document(ctx, obj);
+ if (!src)
+ return pdf_keep_obj(ctx, obj);
- bound = pdf_get_bound_document(ctx, obj_ref);
- if (bound && bound != src)
- fz_throw(ctx, FZ_ERROR_GENERIC, "grafted object does not belong to the source document");
+ if (map->src && src != map->src)
+ fz_throw(ctx, FZ_ERROR_GENERIC, "grafted objects must all belong to the same source document");
- if (pdf_is_indirect(ctx, obj_ref))
+ if (pdf_is_indirect(ctx, obj))
{
- src_num = pdf_to_num(ctx, obj_ref);
+ src_num = pdf_to_num(ctx, obj);
- if (src_num < 1 || src_num >= map->len)
+ if (map->src == NULL)
{
- pdf_drop_graft_map(ctx, drop_map);
- fz_throw(ctx, FZ_ERROR_GENERIC, "source object number out of range");
+ fz_try(ctx)
+ {
+ map->src = pdf_keep_document(ctx, src);
+ map->len = pdf_xref_len(ctx, src);
+ map->dst_from_src = fz_calloc(ctx, map->len, sizeof(int));
+ }
+ fz_catch(ctx)
+ {
+ pdf_drop_document(ctx, map->src);
+ map->src = NULL;
+ fz_rethrow(ctx);
+ }
}
- /* Check if we have done this one. If yes, then drop map (if allocated)
- * and return our indirect ref */
+ if (src_num < 1 || src_num >= map->len)
+ fz_throw(ctx, FZ_ERROR_GENERIC, "source object number out of range");
+
+ /* Check if we have done this one. If yes, then just
+ * return our indirect ref */
if (map->dst_from_src[src_num] != 0)
{
int dest_num = map->dst_from_src[src_num];
- pdf_drop_graft_map(ctx, drop_map);
- return pdf_new_indirect(ctx, dst, dest_num, 0);
+ return pdf_new_indirect(ctx, map->dst, dest_num, 0);
}
fz_var(buffer);
@@ -101,25 +122,22 @@ pdf_graft_object(fz_context *ctx, pdf_document *dst, pdf_document *src, pdf_obj
{
/* Create new slot for our src object, set the mapping and call again
* using the resolved indirect reference */
- new_num = pdf_create_object(ctx, dst);
+ new_num = pdf_create_object(ctx, map->dst);
map->dst_from_src[src_num] = new_num;
- new_obj = pdf_graft_object(ctx, dst, src, pdf_resolve_indirect(ctx, obj_ref), map);
+ new_obj = pdf_graft_mapped_object(ctx, map, pdf_resolve_indirect(ctx, obj));
/* Return a ref to the new_obj making sure to attach any stream */
- pdf_update_object(ctx, dst, new_num, new_obj);
+ pdf_update_object(ctx, map->dst, new_num, new_obj);
pdf_drop_obj(ctx, new_obj);
- ref = pdf_new_indirect(ctx, dst, new_num, 0);
- if (pdf_is_stream(ctx, obj_ref))
+ ref = pdf_new_indirect(ctx, map->dst, new_num, 0);
+ if (pdf_is_stream(ctx, obj))
{
buffer = pdf_load_raw_stream_number(ctx, src, src_num);
- pdf_update_stream(ctx, dst, ref, buffer, 1);
+ pdf_update_stream(ctx, map->dst, ref, buffer, 1);
}
}
fz_always(ctx)
- {
fz_drop_buffer(ctx, buffer);
- pdf_drop_graft_map(ctx, drop_map);
- }
fz_catch(ctx)
{
pdf_drop_obj(ctx, ref);
@@ -127,26 +145,20 @@ pdf_graft_object(fz_context *ctx, pdf_document *dst, pdf_document *src, pdf_obj
}
return ref;
}
- else if (pdf_is_dict(ctx, obj_ref))
+ else if (pdf_is_dict(ctx, obj))
{
- fz_var(new_dict);
+ len = pdf_dict_len(ctx, obj);
+ new_dict = pdf_new_dict(ctx, map->dst, len);
fz_try(ctx)
{
- len = pdf_dict_len(ctx, obj_ref);
- new_dict = pdf_new_dict(ctx, dst, len);
-
for (i = 0; i < len; i++)
{
- key = pdf_dict_get_key(ctx, obj_ref, i);
- val = pdf_dict_get_val(ctx, obj_ref, i);
- pdf_dict_put_drop(ctx, new_dict, key, pdf_graft_object(ctx, dst, src, val, map));
+ key = pdf_dict_get_key(ctx, obj, i);
+ val = pdf_dict_get_val(ctx, obj, i);
+ pdf_dict_put_drop(ctx, new_dict, key, pdf_graft_mapped_object(ctx, map, val));
}
}
- fz_always(ctx)
- {
- pdf_drop_graft_map(ctx, drop_map);
- }
fz_catch(ctx)
{
pdf_drop_obj(ctx, new_dict);
@@ -154,26 +166,20 @@ pdf_graft_object(fz_context *ctx, pdf_document *dst, pdf_document *src, pdf_obj
}
return new_dict;
}
- else if (pdf_is_array(ctx, obj_ref))
+ else if (pdf_is_array(ctx, obj))
{
- fz_var(new_array);
+ /* Step through the array items handling indirect refs */
+ len = pdf_array_len(ctx, obj);
+ new_array = pdf_new_array(ctx, map->dst, len);
fz_try(ctx)
{
- /* Step through the array items handling indirect refs */
- len = pdf_array_len(ctx, obj_ref);
- new_array = pdf_new_array(ctx, dst, len);
-
for (i = 0; i < len; i++)
{
- val = pdf_array_get(ctx, obj_ref, i);
- pdf_array_push_drop(ctx, new_array, pdf_graft_object(ctx, dst, src, val, map));
+ val = pdf_array_get(ctx, obj, i);
+ pdf_array_push_drop(ctx, new_array, pdf_graft_mapped_object(ctx, map, val));
}
}
- fz_always(ctx)
- {
- pdf_drop_graft_map(ctx, drop_map);
- }
fz_catch(ctx)
{
pdf_drop_obj(ctx, new_array);
@@ -183,7 +189,7 @@ pdf_graft_object(fz_context *ctx, pdf_document *dst, pdf_document *src, pdf_obj
}
else
{
- pdf_drop_graft_map(ctx, drop_map);
- return pdf_keep_obj(ctx, obj_ref);;
+ assert("This never happens" == NULL);
+ return NULL;
}
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-17 12:15:46 +0000