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#include "mupdf/pdf.h"
struct pdf_graft_map_s
{
int refs;
int len;
pdf_document *src;
int *dst_from_src;
};
pdf_graft_map *
pdf_new_graft_map(fz_context *ctx, pdf_document *src)
{
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->refs = 1;
return map;
}
pdf_graft_map *
fz_keep_graft_map(fz_context *ctx, pdf_graft_map *map)
{
if (map)
++map->refs;
return map;
}
void
pdf_drop_graft_map(fz_context *ctx, pdf_graft_map *map)
{
if (map && --map->refs == 0)
{
fz_drop_document(ctx, (fz_document*)map->src);
fz_free(ctx, map->dst_from_src);
fz_free(ctx, 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_obj *val, *key;
pdf_obj *new_obj = NULL;
pdf_obj *new_dict = NULL;
pdf_obj *new_array = NULL;
pdf_obj *ref = NULL;
fz_buffer *buffer = NULL;
pdf_graft_map *drop_map = NULL;
pdf_document *bound;
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");
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 (pdf_is_indirect(ctx, obj_ref))
{
src_num = pdf_to_num(ctx, obj_ref);
if (src_num < 1 || src_num >= map->len)
{
pdf_drop_graft_map(ctx, drop_map);
fz_throw(ctx, FZ_ERROR_GENERIC, "source object number out of range");
}
/* Check if we have done this one. If yes, then drop map (if allocated)
* and 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);
}
fz_var(buffer);
fz_var(ref);
fz_try(ctx)
{
/* 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);
map->dst_from_src[src_num] = new_num;
new_obj = pdf_graft_object(ctx, dst, src, pdf_resolve_indirect(ctx, obj_ref), map);
/* Return a ref to the new_obj making sure to attach any stream */
pdf_update_object(ctx, 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))
{
buffer = pdf_load_raw_stream(ctx, src, src_num, 0);
pdf_update_stream(ctx, 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);
fz_rethrow(ctx);
}
return ref;
}
else if (pdf_is_dict(ctx, obj_ref))
{
fz_var(new_dict);
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));
}
}
fz_always(ctx)
{
pdf_drop_graft_map(ctx, drop_map);
}
fz_catch(ctx)
{
pdf_drop_obj(ctx, new_dict);
fz_rethrow(ctx);
}
return new_dict;
}
else if (pdf_is_array(ctx, obj_ref))
{
fz_var(new_array);
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));
}
}
fz_always(ctx)
{
pdf_drop_graft_map(ctx, drop_map);
}
fz_catch(ctx)
{
pdf_drop_obj(ctx, new_array);
fz_rethrow(ctx);
}
return new_array;
}
else
{
pdf_drop_graft_map(ctx, drop_map);
return pdf_keep_obj(ctx, obj_ref);;
}
}
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