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#include "mupdf/fitz.h"
#include "mupdf/pdf.h"
#include "../fitz/fitz-imp.h"
#include <assert.h>
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 *dst)
{
pdf_graft_map *map = NULL;
map = fz_malloc_struct(ctx, pdf_graft_map);
map->dst = pdf_keep_document(ctx, dst);
map->refs = 1;
return map;
}
pdf_graft_map *
pdf_keep_graft_map(fz_context *ctx, pdf_graft_map *map)
{
return fz_keep_imp(ctx, map, &map->refs);
}
void
pdf_drop_graft_map(fz_context *ctx, pdf_graft_map *map)
{
if (fz_drop_imp(ctx, map, &map->refs))
{
pdf_drop_document(ctx, map->src);
pdf_drop_document(ctx, map->dst);
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_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;
pdf_obj *new_array;
pdf_obj *ref = NULL;
fz_buffer *buffer = NULL;
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. */
src = pdf_get_bound_document(ctx, obj);
if (!src)
return pdf_keep_obj(ctx, obj);
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))
{
src_num = pdf_to_num(ctx, obj);
if (map->src == NULL)
{
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);
}
}
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];
return pdf_new_indirect(ctx, map->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, map->dst);
map->dst_from_src[src_num] = new_num;
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, map->dst, new_num, new_obj);
pdf_drop_obj(ctx, new_obj);
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, map->dst, ref, buffer, 1);
}
}
fz_always(ctx)
fz_drop_buffer(ctx, buffer);
fz_catch(ctx)
{
pdf_drop_obj(ctx, ref);
fz_rethrow(ctx);
}
return ref;
}
else if (pdf_is_dict(ctx, obj))
{
len = pdf_dict_len(ctx, obj);
new_dict = pdf_new_dict(ctx, map->dst, len);
fz_try(ctx)
{
for (i = 0; i < len; i++)
{
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_catch(ctx)
{
pdf_drop_obj(ctx, new_dict);
fz_rethrow(ctx);
}
return new_dict;
}
else if (pdf_is_array(ctx, obj))
{
/* 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)
{
for (i = 0; i < len; i++)
{
val = pdf_array_get(ctx, obj, i);
pdf_array_push_drop(ctx, new_array, pdf_graft_mapped_object(ctx, map, val));
}
}
fz_catch(ctx)
{
pdf_drop_obj(ctx, new_array);
fz_rethrow(ctx);
}
return new_array;
}
else
{
assert("This never happens" == NULL);
return NULL;
}
}
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