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|
#include "mupdf/pdf.h"
#include <zlib.h>
/* #define DEBUG_LINEARIZATION */
/* #define DEBUG_HEAP_SORT */
/* #define DEBUG_WRITING */
typedef struct pdf_write_options_s pdf_write_options;
/*
As part of linearization, we need to keep a list of what objects are used
by what page. We do this by recording the objects used in a given page
in a page_objects structure. We have a list of these structures (one per
page) in the page_objects_list structure.
The page_objects structure maintains a heap in the object array, so
insertion takes log n time, and we can heapsort and dedupe at the end for
a total worse case n log n time.
The magic heap invariant is that:
entry[n] >= entry[(n+1)*2-1] & entry[n] >= entry[(n+1)*2]
or equivalently:
entry[(n-1)>>1] >= entry[n]
For a discussion of the heap data structure (and heapsort) see Kingston,
"Algorithms and Data Structures".
*/
typedef struct {
int num_shared;
int page_object_number;
int num_objects;
int min_ofs;
int max_ofs;
/* Extensible list of objects used on this page */
int cap;
int len;
int object[1];
} page_objects;
typedef struct {
int cap;
int len;
page_objects *page[1];
} page_objects_list;
struct pdf_write_options_s
{
FILE *out;
int do_incremental;
int do_tight;
int do_ascii;
int do_expand;
int do_deflate;
int do_garbage;
int do_linear;
int do_clean;
int *use_list;
fz_off_t *ofs_list;
int *gen_list;
int *renumber_map;
int continue_on_error;
int *errors;
/* The following extras are required for linearization */
int *rev_renumber_map;
int *rev_gen_list;
int start;
fz_off_t first_xref_offset;
fz_off_t main_xref_offset;
fz_off_t first_xref_entry_offset;
fz_off_t file_len;
int hints_shared_offset;
int hintstream_len;
pdf_obj *linear_l;
pdf_obj *linear_h0;
pdf_obj *linear_h1;
pdf_obj *linear_o;
pdf_obj *linear_e;
pdf_obj *linear_n;
pdf_obj *linear_t;
pdf_obj *hints_s;
pdf_obj *hints_length;
int page_count;
page_objects_list *page_object_lists;
};
/*
* Constants for use with use_list.
*
* If use_list[num] = 0, then object num is unused.
* If use_list[num] & PARAMS, then object num is the linearisation params obj.
* If use_list[num] & CATALOGUE, then object num is used by the catalogue.
* If use_list[num] & PAGE1, then object num is used by page 1.
* If use_list[num] & SHARED, then object num is shared between pages.
* If use_list[num] & PAGE_OBJECT then this must be the first object in a page.
* If use_list[num] & OTHER_OBJECTS then this must should appear in section 9.
* Otherwise object num is used by page (use_list[num]>>USE_PAGE_SHIFT).
*/
enum
{
USE_CATALOGUE = 2,
USE_PAGE1 = 4,
USE_SHARED = 8,
USE_PARAMS = 16,
USE_HINTS = 32,
USE_PAGE_OBJECT = 64,
USE_OTHER_OBJECTS = 128,
USE_PAGE_MASK = ~255,
USE_PAGE_SHIFT = 8
};
/*
* page_objects and page_object_list handling functions
*/
static page_objects_list *
page_objects_list_create(fz_context *ctx)
{
page_objects_list *pol = fz_calloc(ctx, 1, sizeof(*pol));
pol->cap = 1;
pol->len = 0;
return pol;
}
static void
page_objects_list_destroy(fz_context *ctx, page_objects_list *pol)
{
int i;
if (!pol)
return;
for (i = 0; i < pol->len; i++)
{
fz_free(ctx, pol->page[i]);
}
fz_free(ctx, pol);
}
static void
page_objects_list_ensure(fz_context *ctx, page_objects_list **pol, int newcap)
{
int oldcap = (*pol)->cap;
if (newcap <= oldcap)
return;
*pol = fz_resize_array(ctx, *pol, 1, sizeof(page_objects_list) + (newcap-1)*sizeof(page_objects *));
memset(&(*pol)->page[oldcap], 0, (newcap-oldcap)*sizeof(page_objects *));
(*pol)->cap = newcap;
}
static page_objects *
page_objects_create(fz_context *ctx)
{
int initial_cap = 8;
page_objects *po = fz_calloc(ctx, 1, sizeof(*po) + (initial_cap-1) * sizeof(int));
po->cap = initial_cap;
po->len = 0;
return po;
}
static void
page_objects_insert(fz_context *ctx, page_objects **ppo, int i)
{
page_objects *po;
/* Make a page_objects if we don't have one */
if (*ppo == NULL)
*ppo = page_objects_create(ctx);
po = *ppo;
/* page_objects insertion: extend the page_objects by 1, and put us on the end */
if (po->len == po->cap)
{
po = fz_resize_array(ctx, po, 1, sizeof(page_objects) + (po->cap*2 - 1)*sizeof(int));
po->cap *= 2;
*ppo = po;
}
po->object[po->len++] = i;
}
static void
page_objects_list_insert(fz_context *ctx, pdf_write_options *opts, int page, int object)
{
page_objects_list_ensure(ctx, &opts->page_object_lists, page+1);
if (opts->page_object_lists->len < page+1)
opts->page_object_lists->len = page+1;
page_objects_insert(ctx, &opts->page_object_lists->page[page], object);
}
static void
page_objects_list_set_page_object(fz_context *ctx, pdf_write_options *opts, int page, int object)
{
page_objects_list_ensure(ctx, &opts->page_object_lists, page+1);
opts->page_object_lists->page[page]->page_object_number = object;
}
static void
page_objects_sort(fz_context *ctx, page_objects *po)
{
int i, j;
int n = po->len;
/* Step 1: Make a heap */
/* Invariant: Valid heap in [0..i), unsorted elements in [i..n) */
for (i = 1; i < n; i++)
{
/* Now bubble backwards to maintain heap invariant */
j = i;
while (j != 0)
{
int tmp;
int k = (j-1)>>1;
if (po->object[k] >= po->object[j])
break;
tmp = po->object[k];
po->object[k] = po->object[j];
po->object[j] = tmp;
j = k;
}
}
/* Step 2: Heap sort */
/* Invariant: valid heap in [0..i), sorted list in [i..n) */
/* Initially: i = n */
for (i = n-1; i > 0; i--)
{
/* Swap the maximum (0th) element from the page_objects into its place
* in the sorted list (position i). */
int tmp = po->object[0];
po->object[0] = po->object[i];
po->object[i] = tmp;
/* Now, the page_objects is invalid because the 0th element is out
* of place. Bubble it until the page_objects is valid. */
j = 0;
while (1)
{
/* Children are k and k+1 */
int k = (j+1)*2-1;
/* If both children out of the page_objects, we're done */
if (k > i-1)
break;
/* If both are in the page_objects, pick the larger one */
if (k < i-1 && po->object[k] < po->object[k+1])
k++;
/* If j is bigger than k (i.e. both of it's children),
* we're done */
if (po->object[j] > po->object[k])
break;
tmp = po->object[k];
po->object[k] = po->object[j];
po->object[j] = tmp;
j = k;
}
}
}
static int
order_ge(int ui, int uj)
{
/*
For linearization, we need to order the sections as follows:
Remaining pages (Part 7)
Shared objects (Part 8)
Objects not associated with any page (Part 9)
Any "other" objects
(Header)(Part 1)
(Linearization params) (Part 2)
(1st page Xref/Trailer) (Part 3)
Catalogue (and other document level objects) (Part 4)
First page (Part 6)
(Primary Hint stream) (*) (Part 5)
Any free objects
Note, this is NOT the same order they appear in
the final file!
(*) The PDF reference gives us the option of putting the hint stream
after the first page, and we take it, for simplicity.
*/
/* If the 2 objects are in the same section, then page object comes first. */
if (((ui ^ uj) & ~USE_PAGE_OBJECT) == 0)
return ((ui & USE_PAGE_OBJECT) == 0);
/* Put unused objects last */
else if (ui == 0)
return 1;
else if (uj == 0)
return 0;
/* Put the hint stream before that... */
else if (ui & USE_HINTS)
return 1;
else if (uj & USE_HINTS)
return 0;
/* Put page 1 before that... */
else if (ui & USE_PAGE1)
return 1;
else if (uj & USE_PAGE1)
return 0;
/* Put the catalogue before that... */
else if (ui & USE_CATALOGUE)
return 1;
else if (uj & USE_CATALOGUE)
return 0;
/* Put the linearization params before that... */
else if (ui & USE_PARAMS)
return 1;
else if (uj & USE_PARAMS)
return 0;
/* Put other objects before that */
else if (ui & USE_OTHER_OBJECTS)
return 1;
else if (uj & USE_OTHER_OBJECTS)
return 0;
/* Put objects not associated with any page (anything
* not touched by the catalogue) before that... */
else if (ui == 0)
return 1;
else if (uj == 0)
return 0;
/* Put shared objects before that... */
else if (ui & USE_SHARED)
return 1;
else if (uj & USE_SHARED)
return 0;
/* And otherwise, order by the page number on which
* they are used. */
return (ui>>USE_PAGE_SHIFT) >= (uj>>USE_PAGE_SHIFT);
}
static void
heap_sort(int *list, int n, const int *val, int (*ge)(int, int))
{
int i, j;
#ifdef DEBUG_HEAP_SORT
fprintf(stderr, "Initially:\n");
for (i=0; i < n; i++)
{
fprintf(stderr, "%d: %d %x\n", i, list[i], val[list[i]]);
}
#endif
/* Step 1: Make a heap */
/* Invariant: Valid heap in [0..i), unsorted elements in [i..n) */
for (i = 1; i < n; i++)
{
/* Now bubble backwards to maintain heap invariant */
j = i;
while (j != 0)
{
int tmp;
int k = (j-1)>>1;
if (ge(val[list[k]], val[list[j]]))
break;
tmp = list[k];
list[k] = list[j];
list[j] = tmp;
j = k;
}
}
#ifdef DEBUG_HEAP_SORT
fprintf(stderr, "Valid heap:\n");
for (i=0; i < n; i++)
{
int k;
fprintf(stderr, "%d: %d %x ", i, list[i], val[list[i]]);
k = (i+1)*2-1;
if (k < n)
{
if (ge(val[list[i]], val[list[k]]))
fprintf(stderr, "OK ");
else
fprintf(stderr, "BAD ");
}
if (k+1 < n)
{
if (ge(val[list[i]], val[list[k+1]]))
fprintf(stderr, "OK\n");
else
fprintf(stderr, "BAD\n");
}
else
fprintf(stderr, "\n");
}
#endif
/* Step 2: Heap sort */
/* Invariant: valid heap in [0..i), sorted list in [i..n) */
/* Initially: i = n */
for (i = n-1; i > 0; i--)
{
/* Swap the maximum (0th) element from the page_objects into its place
* in the sorted list (position i). */
int tmp = list[0];
list[0] = list[i];
list[i] = tmp;
/* Now, the page_objects is invalid because the 0th element is out
* of place. Bubble it until the page_objects is valid. */
j = 0;
while (1)
{
/* Children are k and k+1 */
int k = (j+1)*2-1;
/* If both children out of the page_objects, we're done */
if (k > i-1)
break;
/* If both are in the page_objects, pick the larger one */
if (k < i-1 && ge(val[list[k+1]], val[list[k]]))
k++;
/* If j is bigger than k (i.e. both of it's children),
* we're done */
if (ge(val[list[j]], val[list[k]]))
break;
tmp = list[k];
list[k] = list[j];
list[j] = tmp;
j = k;
}
}
#ifdef DEBUG_HEAP_SORT
fprintf(stderr, "Sorted:\n");
for (i=0; i < n; i++)
{
fprintf(stderr, "%d: %d %x ", i, list[i], val[list[i]]);
if (i+1 < n)
{
if (ge(val[list[i+1]], val[list[i]]))
fprintf(stderr, "OK");
else
fprintf(stderr, "BAD");
}
fprintf(stderr, "\n");
}
#endif
}
static void
page_objects_dedupe(fz_context *ctx, page_objects *po)
{
int i, j;
int n = po->len-1;
for (i = 0; i < n; i++)
{
if (po->object[i] == po->object[i+1])
break;
}
j = i; /* j points to the last valid one */
i++; /* i points to the first one we haven't looked at */
for (; i < n; i++)
{
if (po->object[j] != po->object[i])
po->object[++j] = po->object[i];
}
po->len = j+1;
}
static void
page_objects_list_sort_and_dedupe(fz_context *ctx, page_objects_list *pol)
{
int i;
int n = pol->len;
for (i = 0; i < n; i++)
{
page_objects_sort(ctx, pol->page[i]);
page_objects_dedupe(ctx, pol->page[i]);
}
}
#ifdef DEBUG_LINEARIZATION
static void
page_objects_dump(pdf_write_options *opts)
{
page_objects_list *pol = opts->page_object_lists;
int i, j;
for (i = 0; i < pol->len; i++)
{
page_objects *p = pol->page[i];
fprintf(stderr, "Page %d\n", i+1);
for (j = 0; j < p->len; j++)
{
int o = p->object[j];
fprintf(stderr, "\tObject %d: use=%x\n", o, opts->use_list[o]);
}
fprintf(stderr, "Byte range=%d->%d\n", p->min_ofs, p->max_ofs);
fprintf(stderr, "Number of objects=%d, Number of shared objects=%d\n", p->num_objects, p->num_shared);
fprintf(stderr, "Page object number=%d\n", p->page_object_number);
}
}
static void
objects_dump(fz_context *ctx, pdf_document *doc, pdf_write_options *opts)
{
int i;
for (i=0; i < pdf_xref_len(ctx, doc); i++)
{
fprintf(stderr, "Object %d use=%x offset=%d\n", i, opts->use_list[i], (int)opts->ofs_list[i]);
}
}
#endif
/*
* Garbage collect objects not reachable from the trailer.
*/
/* Mark a reference. If it's been marked already, return NULL (as no further
* processing is required). If it's not, return the resolved object so
* that we can continue our recursive marking. If it's a duff reference
* return the fact so that we can remove the reference at source.
*/
static pdf_obj *markref(fz_context *ctx, pdf_document *doc, pdf_write_options *opts, pdf_obj *obj, int *duff)
{
int num = pdf_to_num(ctx, obj);
int gen = pdf_to_gen(ctx, obj);
if (num <= 0 || num >= pdf_xref_len(ctx, doc))
{
*duff = 1;
return NULL;
}
*duff = 0;
if (opts->use_list[num])
return NULL;
opts->use_list[num] = 1;
/* Bake in /Length in stream objects */
fz_try(ctx)
{
if (pdf_is_stream(ctx, doc, num, gen))
{
pdf_obj *len = pdf_dict_get(ctx, obj, PDF_NAME_Length);
if (pdf_is_indirect(ctx, len))
{
opts->use_list[pdf_to_num(ctx, len)] = 0;
len = pdf_resolve_indirect(ctx, len);
pdf_dict_put(ctx, obj, PDF_NAME_Length, len);
}
}
}
fz_catch(ctx)
{
fz_rethrow_if(ctx, FZ_ERROR_TRYLATER);
/* Leave broken */
}
obj = pdf_resolve_indirect(ctx, obj);
if (obj == NULL || pdf_is_null(ctx, obj))
{
*duff = 1;
opts->use_list[num] = 0;
}
return obj;
}
/* Recursively mark an object. If any references found are duff, then
* replace them with nulls. */
static int markobj(fz_context *ctx, pdf_document *doc, pdf_write_options *opts, pdf_obj *obj)
{
int i;
if (pdf_is_indirect(ctx, obj))
{
int duff;
obj = markref(ctx, doc, opts, obj, &duff);
if (duff)
return 1;
}
if (pdf_is_dict(ctx, obj))
{
int n = pdf_dict_len(ctx, obj);
for (i = 0; i < n; i++)
if (markobj(ctx, doc, opts, pdf_dict_get_val(ctx, obj, i)))
pdf_dict_put_val_drop(ctx, obj, i, pdf_new_null(ctx, doc));
}
else if (pdf_is_array(ctx, obj))
{
int n = pdf_array_len(ctx, obj);
for (i = 0; i < n; i++)
if (markobj(ctx, doc, opts, pdf_array_get(ctx, obj, i)))
pdf_array_put_drop(ctx, obj, i, pdf_new_null(ctx, doc));
}
return 0;
}
/*
* Scan for and remove duplicate objects (slow)
*/
static void removeduplicateobjs(fz_context *ctx, pdf_document *doc, pdf_write_options *opts)
{
int num, other;
int xref_len = pdf_xref_len(ctx, doc);
for (num = 1; num < xref_len; num++)
{
/* Only compare an object to objects preceding it */
for (other = 1; other < num; other++)
{
pdf_obj *a, *b;
int differ, newnum, streama, streamb;
if (num == other || !opts->use_list[num] || !opts->use_list[other])
continue;
/*
* Comparing stream objects data contents would take too long.
*
* pdf_is_stream calls pdf_cache_object and ensures
* that the xref table has the objects loaded.
*/
fz_try(ctx)
{
streama = pdf_is_stream(ctx, doc, num, 0);
streamb = pdf_is_stream(ctx, doc, other, 0);
differ = streama || streamb;
if (streama && streamb && opts->do_garbage >= 4)
differ = 0;
}
fz_catch(ctx)
{
/* Assume different */
differ = 1;
}
if (differ)
continue;
a = pdf_get_xref_entry(ctx, doc, num)->obj;
b = pdf_get_xref_entry(ctx, doc, other)->obj;
a = pdf_resolve_indirect(ctx, a);
b = pdf_resolve_indirect(ctx, b);
if (pdf_objcmp(ctx, a, b))
continue;
if (streama && streamb)
{
/* Check to see if streams match too. */
fz_buffer *sa = NULL;
fz_buffer *sb = NULL;
fz_var(sa);
fz_var(sb);
differ = 1;
fz_try(ctx)
{
unsigned char *dataa, *datab;
int lena, lenb;
sa = pdf_load_raw_renumbered_stream(ctx, doc, num, 0, num, 0);
sb = pdf_load_raw_renumbered_stream(ctx, doc, other, 0, other, 0);
lena = fz_buffer_storage(ctx, sa, &dataa);
lenb = fz_buffer_storage(ctx, sb, &datab);
if (lena == lenb && memcmp(dataa, datab, lena) == 0)
differ = 0;
}
fz_always(ctx)
{
fz_drop_buffer(ctx, sa);
fz_drop_buffer(ctx, sb);
}
fz_catch(ctx)
{
fz_rethrow(ctx);
}
if (differ)
continue;
}
/* Keep the lowest numbered object */
newnum = fz_mini(num, other);
opts->renumber_map[num] = newnum;
opts->renumber_map[other] = newnum;
opts->rev_renumber_map[newnum] = num; /* Either will do */
opts->use_list[fz_maxi(num, other)] = 0;
/* One duplicate was found, do not look for another */
break;
}
}
}
/*
* Renumber objects sequentially so the xref is more compact
*
* This code assumes that any opts->renumber_map[n] <= n for all n.
*/
static void compactxref(fz_context *ctx, pdf_document *doc, pdf_write_options *opts)
{
int num, newnum;
int xref_len = pdf_xref_len(ctx, doc);
/*
* Update renumber_map in-place, clustering all used
* objects together at low object ids. Objects that
* already should be renumbered will have their new
* object ids be updated to reflect the compaction.
*/
newnum = 1;
for (num = 1; num < xref_len; num++)
{
/* If it's not used, map it to zero */
if (!opts->use_list[opts->renumber_map[num]])
{
opts->renumber_map[num] = 0;
}
/* If it's not moved, compact it. */
else if (opts->renumber_map[num] == num)
{
opts->rev_renumber_map[newnum] = opts->rev_renumber_map[num];
opts->rev_gen_list[newnum] = opts->rev_gen_list[num];
opts->renumber_map[num] = newnum++;
}
/* Otherwise it's used, and moved. We know that it must have
* moved down, so the place it's moved to will be in the right
* place already. */
else
{
opts->renumber_map[num] = opts->renumber_map[opts->renumber_map[num]];
}
}
}
/*
* Update indirect objects according to renumbering established when
* removing duplicate objects and compacting the xref.
*/
static void renumberobj(fz_context *ctx, pdf_document *doc, pdf_write_options *opts, pdf_obj *obj)
{
int i;
int xref_len = pdf_xref_len(ctx, doc);
if (pdf_is_dict(ctx, obj))
{
int n = pdf_dict_len(ctx, obj);
for (i = 0; i < n; i++)
{
pdf_obj *key = pdf_dict_get_key(ctx, obj, i);
pdf_obj *val = pdf_dict_get_val(ctx, obj, i);
if (pdf_is_indirect(ctx, val))
{
int o = pdf_to_num(ctx, val);
if (o >= xref_len || o <= 0 || opts->renumber_map[o] == 0)
val = pdf_new_null(ctx, doc);
else
val = pdf_new_indirect(ctx, doc, opts->renumber_map[o], 0);
pdf_dict_put(ctx, obj, key, val);
pdf_drop_obj(ctx, val);
}
else
{
renumberobj(ctx, doc, opts, val);
}
}
}
else if (pdf_is_array(ctx, obj))
{
int n = pdf_array_len(ctx, obj);
for (i = 0; i < n; i++)
{
pdf_obj *val = pdf_array_get(ctx, obj, i);
if (pdf_is_indirect(ctx, val))
{
int o = pdf_to_num(ctx, val);
if (o >= xref_len || o <= 0 || opts->renumber_map[o] == 0)
val = pdf_new_null(ctx, doc);
else
val = pdf_new_indirect(ctx, doc, opts->renumber_map[o], 0);
pdf_array_put(ctx, obj, i, val);
pdf_drop_obj(ctx, val);
}
else
{
renumberobj(ctx, doc, opts, val);
}
}
}
}
static void renumberobjs(fz_context *ctx, pdf_document *doc, pdf_write_options *opts)
{
pdf_xref_entry *newxref = NULL;
int newlen;
int num;
int *new_use_list;
int xref_len = pdf_xref_len(ctx, doc);
new_use_list = fz_calloc(ctx, pdf_xref_len(ctx, doc)+3, sizeof(int));
fz_var(newxref);
fz_try(ctx)
{
/* Apply renumber map to indirect references in all objects in xref */
renumberobj(ctx, doc, opts, pdf_trailer(ctx, doc));
for (num = 0; num < xref_len; num++)
{
pdf_obj *obj;
int to = opts->renumber_map[num];
/* If object is going to be dropped, don't bother renumbering */
if (to == 0)
continue;
obj = pdf_get_xref_entry(ctx, doc, num)->obj;
if (pdf_is_indirect(ctx, obj))
{
obj = pdf_new_indirect(ctx, doc, to, 0);
pdf_update_object(ctx, doc, num, obj);
pdf_drop_obj(ctx, obj);
}
else
{
renumberobj(ctx, doc, opts, obj);
}
}
/* Create new table for the reordered, compacted xref */
newxref = fz_malloc_array(ctx, xref_len + 3, sizeof(pdf_xref_entry));
newxref[0] = *pdf_get_xref_entry(ctx, doc, 0);
/* Move used objects into the new compacted xref */
newlen = 0;
for (num = 1; num < xref_len; num++)
{
if (opts->use_list[num])
{
pdf_xref_entry *e;
if (newlen < opts->renumber_map[num])
newlen = opts->renumber_map[num];
e = pdf_get_xref_entry(ctx, doc, num);
newxref[opts->renumber_map[num]] = *e;
if (e->obj)
{
pdf_set_obj_parent(ctx, e->obj, opts->renumber_map[num]);
e->obj = NULL;
}
new_use_list[opts->renumber_map[num]] = opts->use_list[num];
}
else
{
pdf_xref_entry *e = pdf_get_xref_entry(ctx, doc, num);
pdf_drop_obj(ctx, e->obj);
e->obj = NULL;
}
}
pdf_replace_xref(ctx, doc, newxref, newlen + 1);
newxref = NULL;
}
fz_catch(ctx)
{
fz_free(ctx, newxref);
fz_free(ctx, new_use_list);
fz_rethrow(ctx);
}
fz_free(ctx, opts->use_list);
opts->use_list = new_use_list;
for (num = 1; num < xref_len; num++)
{
opts->renumber_map[num] = num;
}
}
static void page_objects_list_renumber(pdf_write_options *opts)
{
int i, j;
for (i = 0; i < opts->page_object_lists->len; i++)
{
page_objects *po = opts->page_object_lists->page[i];
for (j = 0; j < po->len; j++)
{
po->object[j] = opts->renumber_map[po->object[j]];
}
po->page_object_number = opts->renumber_map[po->page_object_number];
}
}
static void
mark_all(fz_context *ctx, pdf_document *doc, pdf_write_options *opts, pdf_obj *val, int flag, int page)
{
if (pdf_mark_obj(ctx, val))
return;
fz_try(ctx)
{
if (pdf_is_indirect(ctx, val))
{
int num = pdf_to_num(ctx, val);
if (opts->use_list[num] & USE_PAGE_MASK)
/* Already used */
opts->use_list[num] |= USE_SHARED;
else
opts->use_list[num] |= flag;
if (page >= 0)
page_objects_list_insert(ctx, opts, page, num);
}
if (pdf_is_dict(ctx, val))
{
int i, n = pdf_dict_len(ctx, val);
for (i = 0; i < n; i++)
{
mark_all(ctx, doc, opts, pdf_dict_get_val(ctx, val, i), flag, page);
}
}
else if (pdf_is_array(ctx, val))
{
int i, n = pdf_array_len(ctx, val);
for (i = 0; i < n; i++)
{
mark_all(ctx, doc, opts, pdf_array_get(ctx, val, i), flag, page);
}
}
}
fz_always(ctx)
{
pdf_unmark_obj(ctx, val);
}
fz_catch(ctx)
{
fz_rethrow(ctx);
}
}
static int
mark_pages(fz_context *ctx, pdf_document *doc, pdf_write_options *opts, pdf_obj *val, int pagenum)
{
if (pdf_mark_obj(ctx, val))
return pagenum;
fz_try(ctx)
{
if (pdf_is_dict(ctx, val))
{
if (pdf_name_eq(ctx, PDF_NAME_Page, pdf_dict_get(ctx, val, PDF_NAME_Type)))
{
int num = pdf_to_num(ctx, val);
pdf_unmark_obj(ctx, val);
mark_all(ctx, doc, opts, val, pagenum == 0 ? USE_PAGE1 : (pagenum<<USE_PAGE_SHIFT), pagenum);
page_objects_list_set_page_object(ctx, opts, pagenum, num);
pagenum++;
opts->use_list[num] |= USE_PAGE_OBJECT;
}
else
{
int i, n = pdf_dict_len(ctx, val);
for (i = 0; i < n; i++)
{
pdf_obj *key = pdf_dict_get_key(ctx, val, i);
pdf_obj *obj = pdf_dict_get_val(ctx, val, i);
if (pdf_name_eq(ctx, PDF_NAME_Kids, key))
pagenum = mark_pages(ctx, doc, opts, obj, pagenum);
else
mark_all(ctx, doc, opts, obj, USE_CATALOGUE, -1);
}
if (pdf_is_indirect(ctx, val))
{
int num = pdf_to_num(ctx, val);
opts->use_list[num] |= USE_CATALOGUE;
}
}
}
else if (pdf_is_array(ctx, val))
{
int i, n = pdf_array_len(ctx, val);
for (i = 0; i < n; i++)
{
pagenum = mark_pages(ctx, doc, opts, pdf_array_get(ctx, val, i), pagenum);
}
if (pdf_is_indirect(ctx, val))
{
int num = pdf_to_num(ctx, val);
opts->use_list[num] |= USE_CATALOGUE;
}
}
}
fz_always(ctx)
{
pdf_unmark_obj(ctx, val);
}
fz_catch(ctx)
{
fz_rethrow(ctx);
}
return pagenum;
}
static void
mark_root(fz_context *ctx, pdf_document *doc, pdf_write_options *opts, pdf_obj *dict)
{
int i, n = pdf_dict_len(ctx, dict);
if (pdf_mark_obj(ctx, dict))
return;
fz_try(ctx)
{
if (pdf_is_indirect(ctx, dict))
{
int num = pdf_to_num(ctx, dict);
opts->use_list[num] |= USE_CATALOGUE;
}
for (i = 0; i < n; i++)
{
pdf_obj *key = pdf_dict_get_key(ctx, dict, i);
pdf_obj *val = pdf_dict_get_val(ctx, dict, i);
if (pdf_name_eq(ctx, PDF_NAME_Pages, key))
opts->page_count = mark_pages(ctx, doc, opts, val, 0);
else if (pdf_name_eq(ctx, PDF_NAME_Names, key))
mark_all(ctx, doc, opts, val, USE_OTHER_OBJECTS, -1);
else if (pdf_name_eq(ctx, PDF_NAME_Dests, key))
mark_all(ctx, doc, opts, val, USE_OTHER_OBJECTS, -1);
else if (pdf_name_eq(ctx, PDF_NAME_Outlines, key))
{
int section;
/* Look at PageMode to decide whether to
* USE_OTHER_OBJECTS or USE_PAGE1 here. */
if (pdf_name_eq(ctx, pdf_dict_get(ctx, dict, PDF_NAME_PageMode), PDF_NAME_UseOutlines))
section = USE_PAGE1;
else
section = USE_OTHER_OBJECTS;
mark_all(ctx, doc, opts, val, section, -1);
}
else
mark_all(ctx, doc, opts, val, USE_CATALOGUE, -1);
}
}
fz_always(ctx)
{
pdf_unmark_obj(ctx, dict);
}
fz_catch(ctx)
{
fz_rethrow(ctx);
}
}
static void
mark_trailer(fz_context *ctx, pdf_document *doc, pdf_write_options *opts, pdf_obj *dict)
{
int i, n = pdf_dict_len(ctx, dict);
if (pdf_mark_obj(ctx, dict))
return;
fz_try(ctx)
{
for (i = 0; i < n; i++)
{
pdf_obj *key = pdf_dict_get_key(ctx, dict, i);
pdf_obj *val = pdf_dict_get_val(ctx, dict, i);
if (pdf_name_eq(ctx, PDF_NAME_Root, key))
mark_root(ctx, doc, opts, val);
else
mark_all(ctx, doc, opts, val, USE_CATALOGUE, -1);
}
}
fz_always(ctx)
{
pdf_unmark_obj(ctx, dict);
}
fz_catch(ctx)
{
fz_rethrow(ctx);
}
}
static void
add_linearization_objs(fz_context *ctx, pdf_document *doc, pdf_write_options *opts)
{
pdf_obj *params_obj = NULL;
pdf_obj *params_ref = NULL;
pdf_obj *hint_obj = NULL;
pdf_obj *hint_ref = NULL;
pdf_obj *o = NULL;
int params_num, hint_num;
fz_var(params_obj);
fz_var(params_ref);
fz_var(hint_obj);
fz_var(hint_ref);
fz_var(o);
fz_try(ctx)
{
/* Linearization params */
params_obj = pdf_new_dict(ctx, doc, 10);
params_ref = pdf_new_ref(ctx, doc, params_obj);
params_num = pdf_to_num(ctx, params_ref);
opts->use_list[params_num] = USE_PARAMS;
opts->renumber_map[params_num] = params_num;
opts->rev_renumber_map[params_num] = params_num;
opts->gen_list[params_num] = 0;
opts->rev_gen_list[params_num] = 0;
pdf_dict_put_drop(ctx, params_obj, PDF_NAME_Linearized, pdf_new_real(ctx, doc, 1.0));
opts->linear_l = pdf_new_int(ctx, doc, INT_MIN);
pdf_dict_put(ctx, params_obj, PDF_NAME_L, opts->linear_l);
opts->linear_h0 = pdf_new_int(ctx, doc, INT_MIN);
o = pdf_new_array(ctx, doc, 2);
pdf_array_push(ctx, o, opts->linear_h0);
opts->linear_h1 = pdf_new_int(ctx, doc, INT_MIN);
pdf_array_push(ctx, o, opts->linear_h1);
pdf_dict_put_drop(ctx, params_obj, PDF_NAME_H, o);
o = NULL;
opts->linear_o = pdf_new_int(ctx, doc, INT_MIN);
pdf_dict_put(ctx, params_obj, PDF_NAME_O, opts->linear_o);
opts->linear_e = pdf_new_int(ctx, doc, INT_MIN);
pdf_dict_put(ctx, params_obj, PDF_NAME_E, opts->linear_e);
opts->linear_n = pdf_new_int(ctx, doc, INT_MIN);
pdf_dict_put(ctx, params_obj, PDF_NAME_N, opts->linear_n);
opts->linear_t = pdf_new_int(ctx, doc, INT_MIN);
pdf_dict_put(ctx, params_obj, PDF_NAME_T, opts->linear_t);
/* Primary hint stream */
hint_obj = pdf_new_dict(ctx, doc, 10);
hint_ref = pdf_new_ref(ctx, doc, hint_obj);
hint_num = pdf_to_num(ctx, hint_ref);
opts->use_list[hint_num] = USE_HINTS;
opts->renumber_map[hint_num] = hint_num;
opts->rev_renumber_map[hint_num] = hint_num;
opts->gen_list[hint_num] = 0;
opts->rev_gen_list[hint_num] = 0;
pdf_dict_put_drop(ctx, hint_obj, PDF_NAME_P, pdf_new_int(ctx, doc, 0));
opts->hints_s = pdf_new_int(ctx, doc, INT_MIN);
pdf_dict_put(ctx, hint_obj, PDF_NAME_S, opts->hints_s);
/* FIXME: Do we have thumbnails? Do a T entry */
/* FIXME: Do we have outlines? Do an O entry */
/* FIXME: Do we have article threads? Do an A entry */
/* FIXME: Do we have named destinations? Do a E entry */
/* FIXME: Do we have interactive forms? Do a V entry */
/* FIXME: Do we have document information? Do an I entry */
/* FIXME: Do we have logical structure heirarchy? Do a C entry */
/* FIXME: Do L, Page Label hint table */
pdf_dict_put_drop(ctx, hint_obj, PDF_NAME_Filter, PDF_NAME_FlateDecode);
opts->hints_length = pdf_new_int(ctx, doc, INT_MIN);
pdf_dict_put(ctx, hint_obj, PDF_NAME_Length, opts->hints_length);
pdf_get_xref_entry(ctx, doc, hint_num)->stm_ofs = -1;
}
fz_always(ctx)
{
pdf_drop_obj(ctx, params_obj);
pdf_drop_obj(ctx, params_ref);
pdf_drop_obj(ctx, hint_ref);
pdf_drop_obj(ctx, hint_obj);
pdf_drop_obj(ctx, o);
}
fz_catch(ctx)
{
fz_rethrow(ctx);
}
}
static void
lpr_inherit_res_contents(fz_context *ctx, pdf_obj *res, pdf_obj *dict, pdf_obj *text)
{
pdf_obj *o, *r;
int i, n;
/* If the parent node doesn't have an entry of this type, give up. */
o = pdf_dict_get(ctx, dict, text);
if (!o)
return;
/* If the resources dict we are building doesn't have an entry of this
* type yet, then just copy it (ensuring it's not a reference) */
r = pdf_dict_get(ctx, res, text);
if (r == NULL)
{
o = pdf_resolve_indirect(ctx, o);
if (pdf_is_dict(ctx, o))
o = pdf_copy_dict(ctx, o);
else if (pdf_is_array(ctx, o))
o = pdf_copy_array(ctx, o);
else
o = NULL;
if (o)
pdf_dict_put(ctx, res, text, o);
return;
}
/* Otherwise we need to merge o into r */
if (pdf_is_dict(ctx, o))
{
n = pdf_dict_len(ctx, o);
for (i = 0; i < n; i++)
{
pdf_obj *key = pdf_dict_get_key(ctx, o, i);
pdf_obj *val = pdf_dict_get_val(ctx, o, i);
if (pdf_dict_get(ctx, res, key))
continue;
pdf_dict_put(ctx, res, key, val);
}
}
}
static void
lpr_inherit_res(fz_context *ctx, pdf_obj *node, int depth, pdf_obj *dict)
{
while (1)
{
pdf_obj *o;
node = pdf_dict_get(ctx, node, PDF_NAME_Parent);
depth--;
if (!node || depth < 0)
break;
o = pdf_dict_get(ctx, node, PDF_NAME_Resources);
if (o)
{
lpr_inherit_res_contents(ctx, dict, o, PDF_NAME_ExtGState);
lpr_inherit_res_contents(ctx, dict, o, PDF_NAME_ColorSpace);
lpr_inherit_res_contents(ctx, dict, o, PDF_NAME_Pattern);
lpr_inherit_res_contents(ctx, dict, o, PDF_NAME_Shading);
lpr_inherit_res_contents(ctx, dict, o, PDF_NAME_XObject);
lpr_inherit_res_contents(ctx, dict, o, PDF_NAME_Font);
lpr_inherit_res_contents(ctx, dict, o, PDF_NAME_ProcSet);
lpr_inherit_res_contents(ctx, dict, o, PDF_NAME_Properties);
}
}
}
static pdf_obj *
lpr_inherit(fz_context *ctx, pdf_obj *node, char *text, int depth)
{
do
{
pdf_obj *o = pdf_dict_gets(ctx, node, text);
if (o)
return pdf_resolve_indirect(ctx, o);
node = pdf_dict_get(ctx, node, PDF_NAME_Parent);
depth--;
}
while (depth >= 0 && node);
return NULL;
}
static int
lpr(fz_context *ctx, pdf_document *doc, pdf_obj *node, int depth, int page)
{
pdf_obj *kids;
pdf_obj *o = NULL;
int i, n;
if (pdf_mark_obj(ctx, node))
return page;
fz_var(o);
fz_try(ctx)
{
if (pdf_name_eq(ctx, PDF_NAME_Page, pdf_dict_get(ctx, node, PDF_NAME_Type)))
{
pdf_obj *r; /* r is deliberately not cleaned up */
/* Copy resources down to the child */
o = pdf_keep_obj(ctx, pdf_dict_get(ctx, node, PDF_NAME_Resources));
if (!o)
{
o = pdf_keep_obj(ctx, pdf_new_dict(ctx, doc, 2));
pdf_dict_put(ctx, node, PDF_NAME_Resources, o);
}
lpr_inherit_res(ctx, node, depth, o);
r = lpr_inherit(ctx, node, "MediaBox", depth);
if (r)
pdf_dict_put(ctx, node, PDF_NAME_MediaBox, r);
r = lpr_inherit(ctx, node, "CropBox", depth);
if (r)
pdf_dict_put(ctx, node, PDF_NAME_CropBox, r);
r = lpr_inherit(ctx, node, "BleedBox", depth);
if (r)
pdf_dict_put(ctx, node, PDF_NAME_BleedBox, r);
r = lpr_inherit(ctx, node, "TrimBox", depth);
if (r)
pdf_dict_put(ctx, node, PDF_NAME_TrimBox, r);
r = lpr_inherit(ctx, node, "ArtBox", depth);
if (r)
pdf_dict_put(ctx, node, PDF_NAME_ArtBox, r);
r = lpr_inherit(ctx, node, "Rotate", depth);
if (r)
pdf_dict_put(ctx, node, PDF_NAME_Rotate, r);
page++;
}
else
{
kids = pdf_dict_get(ctx, node, PDF_NAME_Kids);
n = pdf_array_len(ctx, kids);
for(i = 0; i < n; i++)
{
page = lpr(ctx, doc, pdf_array_get(ctx, kids, i), depth+1, page);
}
pdf_dict_del(ctx, node, PDF_NAME_Resources);
pdf_dict_del(ctx, node, PDF_NAME_MediaBox);
pdf_dict_del(ctx, node, PDF_NAME_CropBox);
pdf_dict_del(ctx, node, PDF_NAME_BleedBox);
pdf_dict_del(ctx, node, PDF_NAME_TrimBox);
pdf_dict_del(ctx, node, PDF_NAME_ArtBox);
pdf_dict_del(ctx, node, PDF_NAME_Rotate);
}
}
fz_always(ctx)
{
pdf_drop_obj(ctx, o);
}
fz_catch(ctx)
{
fz_rethrow(ctx);
}
pdf_unmark_obj(ctx, node);
return page;
}
void
pdf_localise_page_resources(fz_context *ctx, pdf_document *doc)
{
if (doc->resources_localised)
return;
lpr(ctx, doc, pdf_dict_getl(ctx, pdf_trailer(ctx, doc), PDF_NAME_Root, PDF_NAME_Pages, NULL), 0, 0);
doc->resources_localised = 1;
}
static void
linearize(fz_context *ctx, pdf_document *doc, pdf_write_options *opts)
{
int i;
int n = pdf_xref_len(ctx, doc) + 2;
int *reorder;
int *rev_renumber_map;
int *rev_gen_list;
opts->page_object_lists = page_objects_list_create(ctx);
/* Ensure that every page has local references of its resources */
/* FIXME: We could 'thin' the resources according to what is actually
* required for each page, but this would require us to run the page
* content streams. */
pdf_localise_page_resources(ctx, doc);
/* Walk the objects for each page, marking which ones are used, where */
memset(opts->use_list, 0, n * sizeof(int));
mark_trailer(ctx, doc, opts, pdf_trailer(ctx, doc));
/* Add new objects required for linearization */
add_linearization_objs(ctx, doc, opts);
#ifdef DEBUG_WRITING
fprintf(stderr, "Usage calculated:\n");
for (i=0; i < pdf_xref_len(ctx, doc); i++)
{
fprintf(stderr, "%d: use=%d\n", i, opts->use_list[i]);
}
#endif
/* Allocate/init the structures used for renumbering the objects */
reorder = fz_calloc(ctx, n, sizeof(int));
rev_renumber_map = fz_calloc(ctx, n, sizeof(int));
rev_gen_list = fz_calloc(ctx, n, sizeof(int));
for (i = 0; i < n; i++)
{
reorder[i] = i;
}
/* Heap sort the reordering */
heap_sort(reorder+1, n-1, opts->use_list, &order_ge);
#ifdef DEBUG_WRITING
fprintf(stderr, "Reordered:\n");
for (i=1; i < pdf_xref_len(ctx, doc); i++)
{
fprintf(stderr, "%d: use=%d\n", i, opts->use_list[reorder[i]]);
}
#endif
/* Find the split point */
for (i = 1; (opts->use_list[reorder[i]] & USE_PARAMS) == 0; i++);
opts->start = i;
/* Roll the reordering into the renumber_map */
for (i = 0; i < n; i++)
{
opts->renumber_map[reorder[i]] = i;
rev_renumber_map[i] = opts->rev_renumber_map[reorder[i]];
rev_gen_list[i] = opts->rev_gen_list[reorder[i]];
}
fz_free(ctx, opts->rev_renumber_map);
fz_free(ctx, opts->rev_gen_list);
opts->rev_renumber_map = rev_renumber_map;
opts->rev_gen_list = rev_gen_list;
fz_free(ctx, reorder);
/* Apply the renumber_map */
page_objects_list_renumber(opts);
renumberobjs(ctx, doc, opts);
page_objects_list_sort_and_dedupe(ctx, opts->page_object_lists);
}
static void
update_linearization_params(fz_context *ctx, pdf_document *doc, pdf_write_options *opts)
{
fz_off_t offset;
pdf_set_int(ctx, opts->linear_l, opts->file_len);
/* Primary hint stream offset (of object, not stream!) */
pdf_set_int_offset(ctx, opts->linear_h0, opts->ofs_list[pdf_xref_len(ctx, doc)-1]);
/* Primary hint stream length (of object, not stream!) */
offset = (opts->start == 1 ? opts->main_xref_offset : opts->ofs_list[1] + opts->hintstream_len);
pdf_set_int_offset(ctx, opts->linear_h1, offset - opts->ofs_list[pdf_xref_len(ctx, doc)-1]);
/* Object number of first pages page object (the first object of page 0) */
pdf_set_int(ctx, opts->linear_o, opts->page_object_lists->page[0]->object[0]);
/* Offset of end of first page (first page is followed by primary
* hint stream (object n-1) then remaining pages (object 1...). The
* primary hint stream counts as part of the first pages data, I think.
*/
offset = (opts->start == 1 ? opts->main_xref_offset : opts->ofs_list[1] + opts->hintstream_len);
pdf_set_int_offset(ctx, opts->linear_e, offset);
/* Number of pages in document */
pdf_set_int(ctx, opts->linear_n, opts->page_count);
/* Offset of first entry in main xref table */
pdf_set_int_offset(ctx, opts->linear_t, opts->first_xref_entry_offset + opts->hintstream_len);
/* Offset of shared objects hint table in the primary hint stream */
pdf_set_int_offset(ctx, opts->hints_s, opts->hints_shared_offset);
/* Primary hint stream length */
pdf_set_int(ctx, opts->hints_length, opts->hintstream_len);
}
/*
* Make sure we have loaded objects from object streams.
*/
static void preloadobjstms(fz_context *ctx, pdf_document *doc)
{
pdf_obj *obj;
int num;
int xref_len = pdf_xref_len(ctx, doc);
for (num = 0; num < xref_len; num++)
{
if (pdf_get_xref_entry(ctx, doc, num)->type == 'o')
{
obj = pdf_load_object(ctx, doc, num, 0);
pdf_drop_obj(ctx, obj);
}
}
}
/*
* Save streams and objects to the output
*/
static inline int isbinary(int c)
{
if (c == '\n' || c == '\r' || c == '\t')
return 0;
return c < 32 || c > 127;
}
static int isbinarystream(fz_buffer *buf)
{
int i;
for (i = 0; i < buf->len; i++)
if (isbinary(buf->data[i]))
return 1;
return 0;
}
static fz_buffer *hexbuf(fz_context *ctx, unsigned char *p, int n)
{
static const char hex[17] = "0123456789abcdef";
fz_buffer *buf;
int x = 0;
buf = fz_new_buffer(ctx, n * 2 + (n / 32) + 2);
while (n--)
{
buf->data[buf->len++] = hex[*p >> 4];
buf->data[buf->len++] = hex[*p & 15];
if (++x == 32)
{
buf->data[buf->len++] = '\n';
x = 0;
}
p++;
}
buf->data[buf->len++] = '>';
buf->data[buf->len++] = '\n';
return buf;
}
static void addhexfilter(fz_context *ctx, pdf_document *doc, pdf_obj *dict)
{
pdf_obj *f, *dp, *newf, *newdp;
pdf_obj *nullobj;
nullobj = pdf_new_null(ctx, doc);
newf = newdp = NULL;
f = pdf_dict_get(ctx, dict, PDF_NAME_Filter);
dp = pdf_dict_get(ctx, dict, PDF_NAME_DecodeParms);
if (pdf_is_name(ctx, f))
{
newf = pdf_new_array(ctx, doc, 2);
pdf_array_push(ctx, newf, PDF_NAME_ASCIIHexDecode);
pdf_array_push(ctx, newf, f);
f = newf;
if (pdf_is_dict(ctx, dp))
{
newdp = pdf_new_array(ctx, doc, 2);
pdf_array_push(ctx, newdp, nullobj);
pdf_array_push(ctx, newdp, dp);
dp = newdp;
}
}
else if (pdf_is_array(ctx, f))
{
pdf_array_insert(ctx, f, PDF_NAME_ASCIIHexDecode, 0);
if (pdf_is_array(ctx, dp))
pdf_array_insert(ctx, dp, nullobj, 0);
}
else
f = PDF_NAME_ASCIIHexDecode;
pdf_dict_put(ctx, dict, PDF_NAME_Filter, f);
if (dp)
pdf_dict_put(ctx, dict, PDF_NAME_DecodeParms, dp);
pdf_drop_obj(ctx, nullobj);
pdf_drop_obj(ctx, newf);
pdf_drop_obj(ctx, newdp);
}
static fz_buffer *deflatebuf(fz_context *ctx, unsigned char *p, int n)
{
fz_buffer *buf;
uLongf csize;
int t;
buf = fz_new_buffer(ctx, compressBound(n));
csize = buf->cap;
t = compress(buf->data, &csize, p, n);
if (t != Z_OK)
{
fz_drop_buffer(ctx, buf);
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot deflate buffer");
}
buf->len = csize;
return buf;
}
static void copystream(fz_context *ctx, pdf_document *doc, pdf_write_options *opts, pdf_obj *obj_orig, int num, int gen)
{
fz_buffer *buf, *tmp;
pdf_obj *newlen;
pdf_obj *obj;
int orig_num = opts->rev_renumber_map[num];
int orig_gen = opts->rev_gen_list[num];
buf = pdf_load_raw_renumbered_stream(ctx, doc, num, gen, orig_num, orig_gen);
obj = pdf_copy_dict(ctx, obj_orig);
if (opts->do_deflate && !pdf_dict_get(ctx, obj, PDF_NAME_Filter))
{
pdf_dict_put(ctx, obj, PDF_NAME_Filter, PDF_NAME_FlateDecode);
tmp = deflatebuf(ctx, buf->data, buf->len);
fz_drop_buffer(ctx, buf);
buf = tmp;
}
if (opts->do_ascii && isbinarystream(buf))
{
tmp = hexbuf(ctx, buf->data, buf->len);
fz_drop_buffer(ctx, buf);
buf = tmp;
addhexfilter(ctx, doc, obj);
newlen = pdf_new_int(ctx, doc, buf->len);
pdf_dict_put(ctx, obj, PDF_NAME_Length, newlen);
pdf_drop_obj(ctx, newlen);
}
fz_fprintf(ctx, opts->out, "%d %d obj\n", num, gen);
pdf_fprint_obj(ctx, opts->out, obj, opts->do_tight);
fputs("stream\n", opts->out);
fwrite(buf->data, 1, buf->len, opts->out);
fputs("endstream\nendobj\n\n", opts->out);
fz_drop_buffer(ctx, buf);
pdf_drop_obj(ctx, obj);
}
static void expandstream(fz_context *ctx, pdf_document *doc, pdf_write_options *opts, pdf_obj *obj_orig, int num, int gen)
{
fz_buffer *buf, *tmp;
pdf_obj *newlen;
pdf_obj *obj;
int orig_num = opts->rev_renumber_map[num];
int orig_gen = opts->rev_gen_list[num];
int truncated = 0;
buf = pdf_load_renumbered_stream(ctx, doc, num, gen, orig_num, orig_gen, (opts->continue_on_error ? &truncated : NULL));
if (truncated && opts->errors)
(*opts->errors)++;
obj = pdf_copy_dict(ctx, obj_orig);
pdf_dict_del(ctx, obj, PDF_NAME_Filter);
pdf_dict_del(ctx, obj, PDF_NAME_DecodeParms);
if (opts->do_deflate && !pdf_dict_get(ctx, obj, PDF_NAME_Filter))
{
pdf_dict_put(ctx, obj, PDF_NAME_Filter, PDF_NAME_FlateDecode);
tmp = deflatebuf(ctx, buf->data, buf->len);
fz_drop_buffer(ctx, buf);
buf = tmp;
}
if (opts->do_ascii && isbinarystream(buf))
{
tmp = hexbuf(ctx, buf->data, buf->len);
fz_drop_buffer(ctx, buf);
buf = tmp;
addhexfilter(ctx, doc, obj);
}
newlen = pdf_new_int(ctx, doc, buf->len);
pdf_dict_put(ctx, obj, PDF_NAME_Length, newlen);
pdf_drop_obj(ctx, newlen);
fz_fprintf(ctx, opts->out, "%d %d obj\n", num, gen);
pdf_fprint_obj(ctx, opts->out, obj, opts->do_tight);
fputs("stream\n", opts->out);
fwrite(buf->data, 1, buf->len, opts->out);
fputs("endstream\nendobj\n\n", opts->out);
fz_drop_buffer(ctx, buf);
pdf_drop_obj(ctx, obj);
}
static int is_image_filter(char *s)
{
if (!strcmp(s, "CCITTFaxDecode") || !strcmp(s, "CCF") ||
!strcmp(s, "DCTDecode") || !strcmp(s, "DCT") ||
!strcmp(s, "RunLengthDecode") || !strcmp(s, "RL") ||
!strcmp(s, "JBIG2Decode") ||
!strcmp(s, "JPXDecode"))
return 1;
return 0;
}
static int filter_implies_image(fz_context *ctx, pdf_document *doc, pdf_obj *o)
{
if (!o)
return 0;
if (pdf_is_name(ctx, o))
return is_image_filter(pdf_to_name(ctx, o));
if (pdf_is_array(ctx, o))
{
int i, len;
len = pdf_array_len(ctx, o);
for (i = 0; i < len; i++)
if (is_image_filter(pdf_to_name(ctx, pdf_array_get(ctx, o, i))))
return 1;
}
return 0;
}
static void writeobject(fz_context *ctx, pdf_document *doc, pdf_write_options *opts, int num, int gen, int skip_xrefs)
{
pdf_xref_entry *entry;
pdf_obj *obj;
pdf_obj *type;
fz_try(ctx)
{
obj = pdf_load_object(ctx, doc, num, gen);
}
fz_catch(ctx)
{
fz_rethrow_if(ctx, FZ_ERROR_TRYLATER);
if (opts->continue_on_error)
{
fz_fprintf(ctx, opts->out, "%d %d obj\nnull\nendobj\n", num, gen);
if (opts->errors)
(*opts->errors)++;
fz_warn(ctx, "%s", fz_caught_message(ctx));
return;
}
else
fz_rethrow(ctx);
}
/* skip ObjStm and XRef objects */
if (pdf_is_dict(ctx, obj))
{
type = pdf_dict_get(ctx, obj, PDF_NAME_Type);
if (pdf_name_eq(ctx, type, PDF_NAME_ObjStm))
{
opts->use_list[num] = 0;
pdf_drop_obj(ctx, obj);
return;
}
if (skip_xrefs && pdf_name_eq(ctx, type, PDF_NAME_XRef))
{
opts->use_list[num] = 0;
pdf_drop_obj(ctx, obj);
return;
}
}
entry = pdf_get_xref_entry(ctx, doc, num);
if (!pdf_is_stream(ctx, doc, num, gen))
{
fz_fprintf(ctx, opts->out, "%d %d obj\n", num, gen);
pdf_fprint_obj(ctx, opts->out, obj, opts->do_tight);
fputs("endobj\n\n", opts->out);
}
else if (entry->stm_ofs < 0 && entry->stm_buf == NULL)
{
fz_fprintf(ctx, opts->out, "%d %d obj\n", num, gen);
pdf_fprint_obj(ctx, opts->out, obj, opts->do_tight);
fputs("stream\nendstream\nendobj\n\n", opts->out);
}
else
{
int dontexpand = 0;
if (opts->do_expand != 0 && opts->do_expand != fz_expand_all)
{
pdf_obj *o;
if ((o = pdf_dict_get(ctx, obj, PDF_NAME_Type), pdf_name_eq(ctx, o, PDF_NAME_XObject)) &&
(o = pdf_dict_get(ctx, obj, PDF_NAME_Subtype), pdf_name_eq(ctx, o, PDF_NAME_Image)))
dontexpand = !(opts->do_expand & fz_expand_images);
if (o = pdf_dict_get(ctx, obj, PDF_NAME_Type), pdf_name_eq(ctx, o, PDF_NAME_Font))
dontexpand = !(opts->do_expand & fz_expand_fonts);
if (o = pdf_dict_get(ctx, obj, PDF_NAME_Type), pdf_name_eq(ctx, o, PDF_NAME_FontDescriptor))
dontexpand = !(opts->do_expand & fz_expand_fonts);
if (pdf_dict_get(ctx, obj, PDF_NAME_Length1) != NULL)
dontexpand = !(opts->do_expand & fz_expand_fonts);
if (pdf_dict_get(ctx, obj, PDF_NAME_Length2) != NULL)
dontexpand = !(opts->do_expand & fz_expand_fonts);
if (pdf_dict_get(ctx, obj, PDF_NAME_Length3) != NULL)
dontexpand = !(opts->do_expand & fz_expand_fonts);
if (o = pdf_dict_get(ctx, obj, PDF_NAME_Subtype), pdf_name_eq(ctx, o, PDF_NAME_Type1C))
dontexpand = !(opts->do_expand & fz_expand_fonts);
if (o = pdf_dict_get(ctx, obj, PDF_NAME_Subtype), pdf_name_eq(ctx, o, PDF_NAME_CIDFontType0C))
dontexpand = !(opts->do_expand & fz_expand_fonts);
if (o = pdf_dict_get(ctx, obj, PDF_NAME_Filter), filter_implies_image(ctx, doc, o))
dontexpand = !(opts->do_expand & fz_expand_images);
if (pdf_dict_get(ctx, obj, PDF_NAME_Width) != NULL && pdf_dict_get(ctx, obj, PDF_NAME_Height) != NULL)
dontexpand = !(opts->do_expand & fz_expand_images);
}
fz_try(ctx)
{
if (opts->do_expand && !dontexpand && !pdf_is_jpx_image(ctx, obj))
expandstream(ctx, doc, opts, obj, num, gen);
else
copystream(ctx, doc, opts, obj, num, gen);
}
fz_catch(ctx)
{
fz_rethrow_if(ctx, FZ_ERROR_TRYLATER);
if (opts->continue_on_error)
{
fz_fprintf(ctx, opts->out, "%d %d obj\nnull\nendobj\n", num, gen);
if (opts->errors)
(*opts->errors)++;
fz_warn(ctx, "%s", fz_caught_message(ctx));
}
else
{
pdf_drop_obj(ctx, obj);
fz_rethrow(ctx);
}
}
}
pdf_drop_obj(ctx, obj);
}
static void writexrefsubsect(fz_context *ctx, pdf_write_options *opts, int from, int to)
{
int num;
fz_fprintf(ctx, opts->out, "%d %d\n", from, to - from);
for (num = from; num < to; num++)
{
if (opts->use_list[num])
fz_fprintf(ctx, opts->out, "%010Zd %05d n \n", opts->ofs_list[num], opts->gen_list[num]);
else
fz_fprintf(ctx, opts->out, "%010Zd %05d f \n", opts->ofs_list[num], opts->gen_list[num]);
}
}
static void writexref(fz_context *ctx, pdf_document *doc, pdf_write_options *opts, int from, int to, int first, int main_xref_offset, int startxref)
{
pdf_obj *trailer = NULL;
pdf_obj *obj;
pdf_obj *nobj = NULL;
fputs("xref\n", opts->out);
opts->first_xref_entry_offset = fz_ftell(opts->out);
if (opts->do_incremental)
{
int subfrom = from;
int subto;
while (subfrom < to)
{
while (subfrom < to && !pdf_xref_is_incremental(ctx, doc, subfrom))
subfrom++;
subto = subfrom;
while (subto < to && pdf_xref_is_incremental(ctx, doc, subto))
subto++;
if (subfrom < subto)
writexrefsubsect(ctx, opts, subfrom, subto);
subfrom = subto;
}
}
else
{
writexrefsubsect(ctx, opts, from, to);
}
fputs("\n", opts->out);
fz_var(trailer);
fz_var(nobj);
fz_try(ctx)
{
if (opts->do_incremental)
{
trailer = pdf_keep_obj(ctx, pdf_trailer(ctx, doc));
pdf_dict_put_drop(ctx, trailer, PDF_NAME_Size, pdf_new_int(ctx, doc, pdf_xref_len(ctx, doc)));
pdf_dict_put_drop(ctx, trailer, PDF_NAME_Prev, pdf_new_int(ctx, doc, doc->startxref));
doc->startxref = startxref;
}
else
{
trailer = pdf_new_dict(ctx, doc, 5);
nobj = pdf_new_int(ctx, doc, to);
pdf_dict_put(ctx, trailer, PDF_NAME_Size, nobj);
pdf_drop_obj(ctx, nobj);
nobj = NULL;
if (first)
{
obj = pdf_dict_get(ctx, pdf_trailer(ctx, doc), PDF_NAME_Info);
if (obj)
pdf_dict_put(ctx, trailer, PDF_NAME_Info, obj);
obj = pdf_dict_get(ctx, pdf_trailer(ctx, doc), PDF_NAME_Root);
if (obj)
pdf_dict_put(ctx, trailer, PDF_NAME_Root, obj);
obj = pdf_dict_get(ctx, pdf_trailer(ctx, doc), PDF_NAME_ID);
if (obj)
pdf_dict_put(ctx, trailer, PDF_NAME_ID, obj);
}
if (main_xref_offset != 0)
{
nobj = pdf_new_int(ctx, doc, main_xref_offset);
pdf_dict_put(ctx, trailer, PDF_NAME_Prev, nobj);
pdf_drop_obj(ctx, nobj);
nobj = NULL;
}
}
}
fz_always(ctx)
{
pdf_drop_obj(ctx, nobj);
}
fz_catch(ctx)
{
fz_rethrow(ctx);
}
fputs("trailer\n", opts->out);
pdf_fprint_obj(ctx, opts->out, trailer, opts->do_tight);
fputs("\n", opts->out);
pdf_drop_obj(ctx, trailer);
fz_fprintf(ctx, opts->out, "startxref\n%d\n%%%%EOF\n", startxref);
doc->has_xref_streams = 0;
}
static void writexrefstreamsubsect(fz_context *ctx, pdf_document *doc, pdf_write_options *opts, pdf_obj *index, fz_buffer *fzbuf, int from, int to)
{
int num;
pdf_array_push_drop(ctx, index, pdf_new_int(ctx, doc, from));
pdf_array_push_drop(ctx, index, pdf_new_int(ctx, doc, to - from));
for (num = from; num < to; num++)
{
fz_write_buffer_byte(ctx, fzbuf, opts->use_list[num] ? 1 : 0);
fz_write_buffer_byte(ctx, fzbuf, opts->ofs_list[num]>>24);
fz_write_buffer_byte(ctx, fzbuf, opts->ofs_list[num]>>16);
fz_write_buffer_byte(ctx, fzbuf, opts->ofs_list[num]>>8);
fz_write_buffer_byte(ctx, fzbuf, opts->ofs_list[num]);
fz_write_buffer_byte(ctx, fzbuf, opts->gen_list[num]);
}
}
static void writexrefstream(fz_context *ctx, pdf_document *doc, pdf_write_options *opts, int from, int to, int first, int main_xref_offset, int startxref)
{
int num;
pdf_obj *dict = NULL;
pdf_obj *obj;
pdf_obj *w = NULL;
pdf_obj *index;
fz_buffer *fzbuf = NULL;
fz_var(dict);
fz_var(w);
fz_var(fzbuf);
fz_try(ctx)
{
num = pdf_create_object(ctx, doc);
dict = pdf_new_dict(ctx, doc, 6);
pdf_update_object(ctx, doc, num, dict);
opts->first_xref_entry_offset = fz_ftell(opts->out);
to++;
if (first)
{
obj = pdf_dict_get(ctx, pdf_trailer(ctx, doc), PDF_NAME_Info);
if (obj)
pdf_dict_put(ctx, dict, PDF_NAME_Info, obj);
obj = pdf_dict_get(ctx, pdf_trailer(ctx, doc), PDF_NAME_Root);
if (obj)
pdf_dict_put(ctx, dict, PDF_NAME_Root, obj);
obj = pdf_dict_get(ctx, pdf_trailer(ctx, doc), PDF_NAME_ID);
if (obj)
pdf_dict_put(ctx, dict, PDF_NAME_ID, obj);
if (opts->do_incremental)
{
obj = pdf_dict_get(ctx, pdf_trailer(ctx, doc), PDF_NAME_Encrypt);
if (obj)
pdf_dict_put(ctx, dict, PDF_NAME_Encrypt, obj);
}
}
pdf_dict_put_drop(ctx, dict, PDF_NAME_Size, pdf_new_int(ctx, doc, to));
if (opts->do_incremental)
{
pdf_dict_put_drop(ctx, dict, PDF_NAME_Prev, pdf_new_int(ctx, doc, doc->startxref));
doc->startxref = startxref;
}
else
{
if (main_xref_offset != 0)
pdf_dict_put_drop(ctx, dict, PDF_NAME_Prev, pdf_new_int(ctx, doc, main_xref_offset));
}
pdf_dict_put_drop(ctx, dict, PDF_NAME_Type, PDF_NAME_XRef);
w = pdf_new_array(ctx, doc, 3);
pdf_dict_put(ctx, dict, PDF_NAME_W, w);
pdf_array_push_drop(ctx, w, pdf_new_int(ctx, doc, 1));
pdf_array_push_drop(ctx, w, pdf_new_int(ctx, doc, 4));
pdf_array_push_drop(ctx, w, pdf_new_int(ctx, doc, 1));
index = pdf_new_array(ctx, doc, 2);
pdf_dict_put_drop(ctx, dict, PDF_NAME_Index, index);
opts->ofs_list[num] = opts->first_xref_entry_offset;
fzbuf = fz_new_buffer(ctx, 4*(to-from));
if (opts->do_incremental)
{
int subfrom = from;
int subto;
while (subfrom < to)
{
while (subfrom < to && !pdf_xref_is_incremental(ctx, doc, subfrom))
subfrom++;
subto = subfrom;
while (subto < to && pdf_xref_is_incremental(ctx, doc, subto))
subto++;
if (subfrom < subto)
writexrefstreamsubsect(ctx, doc, opts, index, fzbuf, subfrom, subto);
subfrom = subto;
}
}
else
{
writexrefstreamsubsect(ctx, doc, opts, index, fzbuf, from, to);
}
pdf_update_stream(ctx, doc, dict, fzbuf, 0);
writeobject(ctx, doc, opts, num, 0, 0);
fz_fprintf(ctx, opts->out, "startxref\n%Zd\n%%%%EOF\n", startxref);
}
fz_always(ctx)
{
pdf_drop_obj(ctx, dict);
pdf_drop_obj(ctx, w);
fz_drop_buffer(ctx, fzbuf);
}
fz_catch(ctx)
{
fz_rethrow(ctx);
}
}
static void
padto(FILE *file, fz_off_t target)
{
fz_off_t pos = fz_ftell(file);
assert(pos <= target);
while (pos < target)
{
fputc('\n', file);
pos++;
}
}
static void
dowriteobject(fz_context *ctx, pdf_document *doc, pdf_write_options *opts, int num, int pass)
{
pdf_xref_entry *entry = pdf_get_xref_entry(ctx, doc, num);
if (entry->type == 'f')
opts->gen_list[num] = entry->gen;
if (entry->type == 'n')
opts->gen_list[num] = entry->gen;
if (entry->type == 'o')
opts->gen_list[num] = 0;
/* If we are renumbering, then make sure all generation numbers are
* zero (except object 0 which must be free, and have a gen number of
* 65535). Changing the generation numbers (and indeed object numbers)
* will break encryption - so only do this if we are renumbering
* anyway. */
if (opts->do_garbage >= 2)
opts->gen_list[num] = (num == 0 ? 65535 : 0);
if (opts->do_garbage && !opts->use_list[num])
return;
if (entry->type == 'n' || entry->type == 'o')
{
if (pass > 0)
padto(opts->out, opts->ofs_list[num]);
if (!opts->do_incremental || pdf_xref_is_incremental(ctx, doc, num))
{
opts->ofs_list[num] = fz_ftell(opts->out);
writeobject(ctx, doc, opts, num, opts->gen_list[num], 1);
}
}
else
opts->use_list[num] = 0;
}
static void
writeobjects(fz_context *ctx, pdf_document *doc, pdf_write_options *opts, int pass)
{
int num;
int xref_len = pdf_xref_len(ctx, doc);
if (!opts->do_incremental)
{
fprintf(opts->out, "%%PDF-%d.%d\n", doc->version / 10, doc->version % 10);
fputs("%%\316\274\341\277\246\n\n", opts->out);
}
dowriteobject(ctx, doc, opts, opts->start, pass);
if (opts->do_linear)
{
/* Write first xref */
if (pass == 0)
opts->first_xref_offset = fz_ftell(opts->out);
else
padto(opts->out, opts->first_xref_offset);
writexref(ctx, doc, opts, opts->start, pdf_xref_len(ctx, doc), 1, opts->main_xref_offset, 0);
}
for (num = opts->start+1; num < xref_len; num++)
dowriteobject(ctx, doc, opts, num, pass);
if (opts->do_linear && pass == 1)
{
fz_off_t offset = (opts->start == 1 ? opts->main_xref_offset : opts->ofs_list[1] + opts->hintstream_len);
padto(opts->out, offset);
}
for (num = 1; num < opts->start; num++)
{
if (pass == 1)
opts->ofs_list[num] += opts->hintstream_len;
dowriteobject(ctx, doc, opts, num, pass);
}
}
static int
my_log2(int x)
{
int i = 0;
if (x <= 0)
return 0;
while ((1<<i) <= x && (1<<i) > 0)
i++;
if ((1<<i) <= 0)
return 0;
return i;
}
static void
make_page_offset_hints(fz_context *ctx, pdf_document *doc, pdf_write_options *opts, fz_buffer *buf)
{
int i, j;
int min_objs_per_page, max_objs_per_page;
int min_page_length, max_page_length;
int objs_per_page_bits;
int min_shared_object, max_shared_object;
int max_shared_object_refs = 0;
int min_shared_length, max_shared_length;
page_objects **pop = &opts->page_object_lists->page[0];
int page_len_bits, shared_object_bits, shared_object_id_bits;
int shared_length_bits;
int xref_len = pdf_xref_len(ctx, doc);
min_shared_object = pdf_xref_len(ctx, doc);
max_shared_object = 1;
min_shared_length = opts->file_len;
max_shared_length = 0;
for (i=1; i < xref_len; i++)
{
int min, max, page;
min = opts->ofs_list[i];
if (i == opts->start-1 || (opts->start == 1 && i == xref_len-1))
max = opts->main_xref_offset;
else if (i == xref_len-1)
max = opts->ofs_list[1];
else
max = opts->ofs_list[i+1];
assert(max > min);
if (opts->use_list[i] & USE_SHARED)
{
page = -1;
if (i < min_shared_object)
min_shared_object = i;
if (i > max_shared_object)
max_shared_object = i;
if (min_shared_length > max - min)
min_shared_length = max - min;
if (max_shared_length < max - min)
max_shared_length = max - min;
}
else if (opts->use_list[i] & (USE_CATALOGUE | USE_HINTS | USE_PARAMS))
page = -1;
else if (opts->use_list[i] & USE_PAGE1)
{
page = 0;
if (min_shared_length > max - min)
min_shared_length = max - min;
if (max_shared_length < max - min)
max_shared_length = max - min;
}
else if (opts->use_list[i] == 0)
page = -1;
else
page = opts->use_list[i]>>USE_PAGE_SHIFT;
if (page >= 0)
{
pop[page]->num_objects++;
if (pop[page]->min_ofs > min)
pop[page]->min_ofs = min;
if (pop[page]->max_ofs < max)
pop[page]->max_ofs = max;
}
}
min_objs_per_page = max_objs_per_page = pop[0]->num_objects;
min_page_length = max_page_length = pop[0]->max_ofs - pop[0]->min_ofs;
for (i=1; i < opts->page_count; i++)
{
int tmp;
if (min_objs_per_page > pop[i]->num_objects)
min_objs_per_page = pop[i]->num_objects;
if (max_objs_per_page < pop[i]->num_objects)
max_objs_per_page = pop[i]->num_objects;
tmp = pop[i]->max_ofs - pop[i]->min_ofs;
if (tmp < min_page_length)
min_page_length = tmp;
if (tmp > max_page_length)
max_page_length = tmp;
}
for (i=0; i < opts->page_count; i++)
{
int count = 0;
page_objects *po = opts->page_object_lists->page[i];
for (j = 0; j < po->len; j++)
{
if (i == 0 && opts->use_list[po->object[j]] & USE_PAGE1)
count++;
else if (i != 0 && opts->use_list[po->object[j]] & USE_SHARED)
count++;
}
po->num_shared = count;
if (i == 0 || count > max_shared_object_refs)
max_shared_object_refs = count;
}
if (min_shared_object > max_shared_object)
min_shared_object = max_shared_object = 0;
/* Table F.3 - Header */
/* Header Item 1: Least number of objects in a page */
fz_write_buffer_bits(ctx, buf, min_objs_per_page, 32);
/* Header Item 2: Location of first pages page object */
fz_write_buffer_bits(ctx, buf, opts->ofs_list[pop[0]->page_object_number], 32);
/* Header Item 3: Number of bits required to represent the difference
* between the greatest and least number of objects in a page. */
objs_per_page_bits = my_log2(max_objs_per_page - min_objs_per_page);
fz_write_buffer_bits(ctx, buf, objs_per_page_bits, 16);
/* Header Item 4: Least length of a page. */
fz_write_buffer_bits(ctx, buf, min_page_length, 32);
/* Header Item 5: Number of bits needed to represent the difference
* between the greatest and least length of a page. */
page_len_bits = my_log2(max_page_length - min_page_length);
fz_write_buffer_bits(ctx, buf, page_len_bits, 16);
/* Header Item 6: Least offset to start of content stream (Acrobat
* sets this to always be 0) */
fz_write_buffer_bits(ctx, buf, 0, 32);
/* Header Item 7: Number of bits needed to represent the difference
* between the greatest and least offset to content stream (Acrobat
* sets this to always be 0) */
fz_write_buffer_bits(ctx, buf, 0, 16);
/* Header Item 8: Least content stream length. (Acrobat
* sets this to always be 0) */
fz_write_buffer_bits(ctx, buf, 0, 32);
/* Header Item 9: Number of bits needed to represent the difference
* between the greatest and least content stream length (Acrobat
* sets this to always be the same as item 5) */
fz_write_buffer_bits(ctx, buf, page_len_bits, 16);
/* Header Item 10: Number of bits needed to represent the greatest
* number of shared object references. */
shared_object_bits = my_log2(max_shared_object_refs);
fz_write_buffer_bits(ctx, buf, shared_object_bits, 16);
/* Header Item 11: Number of bits needed to represent the greatest
* shared object identifier. */
shared_object_id_bits = my_log2(max_shared_object - min_shared_object + pop[0]->num_shared);
fz_write_buffer_bits(ctx, buf, shared_object_id_bits, 16);
/* Header Item 12: Number of bits needed to represent the numerator
* of the fractions. We always send 0. */
fz_write_buffer_bits(ctx, buf, 0, 16);
/* Header Item 13: Number of bits needed to represent the denominator
* of the fractions. We always send 0. */
fz_write_buffer_bits(ctx, buf, 0, 16);
/* Table F.4 - Page offset hint table (per page) */
/* Item 1: A number that, when added to the least number of objects
* on a page, gives the number of objects in the page. */
for (i = 0; i < opts->page_count; i++)
{
fz_write_buffer_bits(ctx, buf, pop[i]->num_objects - min_objs_per_page, objs_per_page_bits);
}
fz_write_buffer_pad(ctx, buf);
/* Item 2: A number that, when added to the least page length, gives
* the length of the page in bytes. */
for (i = 0; i < opts->page_count; i++)
{
fz_write_buffer_bits(ctx, buf, pop[i]->max_ofs - pop[i]->min_ofs - min_page_length, page_len_bits);
}
fz_write_buffer_pad(ctx, buf);
/* Item 3: The number of shared objects referenced from the page. */
for (i = 0; i < opts->page_count; i++)
{
fz_write_buffer_bits(ctx, buf, pop[i]->num_shared, shared_object_bits);
}
fz_write_buffer_pad(ctx, buf);
/* Item 4: Shared object id for each shared object ref in every page.
* Spec says "not for page 1", but acrobat does send page 1's - all
* as zeros. */
for (i = 0; i < opts->page_count; i++)
{
for (j = 0; j < pop[i]->len; j++)
{
int o = pop[i]->object[j];
if (i == 0 && opts->use_list[o] & USE_PAGE1)
fz_write_buffer_bits(ctx, buf, 0 /* o - pop[0]->page_object_number */, shared_object_id_bits);
if (i != 0 && opts->use_list[o] & USE_SHARED)
fz_write_buffer_bits(ctx, buf, o - min_shared_object + pop[0]->num_shared, shared_object_id_bits);
}
}
fz_write_buffer_pad(ctx, buf);
/* Item 5: Numerator of fractional position for each shared object reference. */
/* We always send 0 in 0 bits */
/* Item 6: A number that, when added to the least offset to the start
* of the content stream (F.3 Item 6), gives the offset in bytes of
* start of the pages content stream object relative to the beginning
* of the page. Always 0 in 0 bits. */
/* Item 7: A number that, when added to the least content stream length
* (F.3 Item 8), gives the length of the pages content stream object.
* Always == Item 2 as least content stream length = least page stream
* length.
*/
for (i = 0; i < opts->page_count; i++)
{
fz_write_buffer_bits(ctx, buf, pop[i]->max_ofs - pop[i]->min_ofs - min_page_length, page_len_bits);
}
/* Pad, and then do shared object hint table */
fz_write_buffer_pad(ctx, buf);
opts->hints_shared_offset = buf->len;
/* Table F.5: */
/* Header Item 1: Object number of the first object in the shared
* objects section. */
fz_write_buffer_bits(ctx, buf, min_shared_object, 32);
/* Header Item 2: Location of first object in the shared objects
* section. */
fz_write_buffer_bits(ctx, buf, opts->ofs_list[min_shared_object], 32);
/* Header Item 3: The number of shared object entries for the first
* page. */
fz_write_buffer_bits(ctx, buf, pop[0]->num_shared, 32);
/* Header Item 4: The number of shared object entries for the shared
* objects section + first page. */
fz_write_buffer_bits(ctx, buf, max_shared_object - min_shared_object + pop[0]->num_shared, 32);
/* Header Item 5: The number of bits needed to represent the greatest
* number of objects in a shared object group (Always 0). */
fz_write_buffer_bits(ctx, buf, 0, 16);
/* Header Item 6: The least length of a shared object group in bytes. */
fz_write_buffer_bits(ctx, buf, min_shared_length, 32);
/* Header Item 7: The number of bits required to represent the
* difference between the greatest and least length of a shared object
* group. */
shared_length_bits = my_log2(max_shared_length - min_shared_length);
fz_write_buffer_bits(ctx, buf, shared_length_bits, 16);
/* Table F.6 */
/* Item 1: Shared object group length (page 1 objects) */
for (j = 0; j < pop[0]->len; j++)
{
int o = pop[0]->object[j];
fz_off_t min, max;
min = opts->ofs_list[o];
if (o == opts->start-1)
max = opts->main_xref_offset;
else if (o < xref_len-1)
max = opts->ofs_list[o+1];
else
max = opts->ofs_list[1];
if (opts->use_list[o] & USE_PAGE1)
fz_write_buffer_bits(ctx, buf, max - min - min_shared_length, shared_length_bits);
}
/* Item 1: Shared object group length (shared objects) */
for (i = min_shared_object; i <= max_shared_object; i++)
{
int min, max;
min = opts->ofs_list[i];
if (i == opts->start-1)
max = opts->main_xref_offset;
else if (i < xref_len-1)
max = opts->ofs_list[i+1];
else
max = opts->ofs_list[1];
fz_write_buffer_bits(ctx, buf, max - min - min_shared_length, shared_length_bits);
}
fz_write_buffer_pad(ctx, buf);
/* Item 2: MD5 presence flags */
for (i = max_shared_object - min_shared_object + pop[0]->num_shared; i > 0; i--)
{
fz_write_buffer_bits(ctx, buf, 0, 1);
}
fz_write_buffer_pad(ctx, buf);
/* Item 3: MD5 sums (not present) */
fz_write_buffer_pad(ctx, buf);
/* Item 4: Number of objects in the group (not present) */
}
static void
make_hint_stream(fz_context *ctx, pdf_document *doc, pdf_write_options *opts)
{
fz_buffer *buf = fz_new_buffer(ctx, 100);
fz_try(ctx)
{
make_page_offset_hints(ctx, doc, opts, buf);
pdf_update_stream(ctx, doc, pdf_load_object(ctx, doc, pdf_xref_len(ctx, doc)-1, 0), buf, 0);
opts->hintstream_len = buf->len;
fz_drop_buffer(ctx, buf);
}
fz_catch(ctx)
{
fz_drop_buffer(ctx, buf);
fz_rethrow(ctx);
}
}
#ifdef DEBUG_WRITING
static void dump_object_details(fz_context *ctx, pdf_document *doc, pdf_write_options *opts)
{
int i;
for (i = 0; i < pdf_xref_len(ctx, doc); i++)
{
fprintf(stderr, "%d@%d: use=%d\n", i, opts->ofs_list[i], opts->use_list[i]);
}
}
#endif
static void presize_unsaved_signature_byteranges(fz_context *ctx, pdf_document *doc)
{
int s;
for (s = 0; s < doc->num_incremental_sections; s++)
{
pdf_xref *xref = &doc->xref_sections[s];
if (xref->unsaved_sigs)
{
/* The ByteRange objects of signatures are initially written out with
* dummy values, and then overwritten later. We need to make sure their
* initial form at least takes enough sufficient file space */
pdf_unsaved_sig *usig;
int n = 0;
for (usig = xref->unsaved_sigs; usig; usig = usig->next)
n++;
for (usig = xref->unsaved_sigs; usig; usig = usig->next)
{
/* There will be segments of bytes at the beginning, at
* the end and between each consecutive pair of signatures,
* hence n + 1 */
int i;
pdf_obj *byte_range = pdf_dict_getl(ctx, usig->field, PDF_NAME_V, PDF_NAME_ByteRange, NULL);
for (i = 0; i < n+1; i++)
{
pdf_array_push_drop(ctx, byte_range, pdf_new_int(ctx, doc, INT_MAX));
pdf_array_push_drop(ctx, byte_range, pdf_new_int(ctx, doc, INT_MAX));
}
}
}
}
}
static void complete_signatures(fz_context *ctx, pdf_document *doc, pdf_write_options *opts, char *filename)
{
pdf_unsaved_sig *usig;
FILE *f;
char buf[5120];
int s;
int i;
int last_end;
for (s = 0; s < doc->num_incremental_sections; s++)
{
pdf_xref *xref = &doc->xref_sections[doc->num_incremental_sections - s - 1];
if (xref->unsaved_sigs)
{
pdf_obj *byte_range;
f = fz_fopen(filename, "rb+");
if (!f)
fz_throw(ctx, FZ_ERROR_GENERIC, "Failed to open %s to complete signatures", filename);
/* Locate the byte ranges and contents in the saved file */
for (usig = xref->unsaved_sigs; usig; usig = usig->next)
{
char *bstr, *cstr, *fstr;
int pnum = pdf_obj_parent_num(ctx, pdf_dict_getl(ctx, usig->field, PDF_NAME_V, PDF_NAME_ByteRange, NULL));
fz_fseek(f, opts->ofs_list[pnum], SEEK_SET);
(void)fread(buf, 1, sizeof(buf), f);
buf[sizeof(buf)-1] = 0;
bstr = strstr(buf, "/ByteRange");
cstr = strstr(buf, "/Contents");
fstr = strstr(buf, "/Filter");
if (bstr && cstr && fstr && bstr < cstr && cstr < fstr)
{
usig->byte_range_start = bstr - buf + 10 + opts->ofs_list[pnum];
usig->byte_range_end = cstr - buf + opts->ofs_list[pnum];
usig->contents_start = cstr - buf + 9 + opts->ofs_list[pnum];
usig->contents_end = fstr - buf + opts->ofs_list[pnum];
}
}
/* Recreate ByteRange with correct values. Initially store the
* recreated object in the first of the unsaved signatures */
byte_range = pdf_new_array(ctx, doc, 4);
pdf_dict_putl_drop(ctx, xref->unsaved_sigs->field, byte_range, PDF_NAME_V, PDF_NAME_ByteRange, NULL);
last_end = 0;
for (usig = xref->unsaved_sigs; usig; usig = usig->next)
{
pdf_array_push_drop(ctx, byte_range, pdf_new_int(ctx, doc, last_end));
pdf_array_push_drop(ctx, byte_range, pdf_new_int(ctx, doc, usig->contents_start - last_end));
last_end = usig->contents_end;
}
pdf_array_push_drop(ctx, byte_range, pdf_new_int(ctx, doc, last_end));
pdf_array_push_drop(ctx, byte_range, pdf_new_int(ctx, doc, xref->end_ofs - last_end));
/* Copy the new ByteRange to the other unsaved signatures */
for (usig = xref->unsaved_sigs->next; usig; usig = usig->next)
pdf_dict_putl_drop(ctx, usig->field, pdf_copy_array(ctx, byte_range), PDF_NAME_V, PDF_NAME_ByteRange, NULL);
/* Write the byte range into buf, padding with spaces*/
i = pdf_sprint_obj(ctx, buf, sizeof(buf), byte_range, 1);
memset(buf+i, ' ', sizeof(buf)-i);
/* Write the byte range to the file */
for (usig = xref->unsaved_sigs; usig; usig = usig->next)
{
fz_fseek(f, usig->byte_range_start, SEEK_SET);
fwrite(buf, 1, usig->byte_range_end - usig->byte_range_start, f);
}
fclose(f);
/* Write the digests into the file */
for (usig = xref->unsaved_sigs; usig; usig = usig->next)
pdf_write_digest(ctx, doc, filename, byte_range, usig->contents_start, usig->contents_end - usig->contents_start, usig->signer);
/* delete the unsaved_sigs records */
while ((usig = xref->unsaved_sigs) != NULL)
{
xref->unsaved_sigs = usig->next;
pdf_drop_obj(ctx, usig->field);
pdf_drop_signer(ctx, usig->signer);
fz_free(ctx, usig);
}
}
}
}
static void sanitize(fz_context *ctx, pdf_document *doc, int ascii)
{
int n = pdf_count_pages(ctx, doc);
int i;
for (i = 0; i < n; i++)
{
pdf_page *page = pdf_load_page(ctx, doc, i);
pdf_clean_page_contents(ctx, doc, page, NULL, NULL, NULL, ascii);
fz_drop_page(ctx, &page->super);
}
}
/* Initialise the pdf_write_options, used dynamically during the write, from the static
* fz_write_options, passed into pdf_write_document */
static void initialise_write_options(fz_context *ctx, pdf_document *doc, const fz_write_options *fz_opts, pdf_write_options *opts)
{
int num;
int xref_len = pdf_xref_len(ctx, doc);
opts->do_incremental = fz_opts->do_incremental;
opts->do_tight = (fz_opts->do_expand == 0) || fz_opts->do_deflate;
opts->do_expand = fz_opts->do_expand;
opts->do_garbage = fz_opts->do_garbage;
opts->do_ascii = fz_opts->do_ascii;
opts->do_deflate = fz_opts->do_deflate;
opts->do_linear = fz_opts->do_linear;
opts->do_clean = fz_opts->do_clean;
opts->start = 0;
opts->main_xref_offset = INT_MIN;
/* We deliberately make these arrays long enough to cope with
* 1 to n access rather than 0..n-1, and add space for 2 new
* extra entries that may be required for linearization. */
opts->use_list = fz_malloc_array(ctx, xref_len + 3, sizeof(int));
opts->ofs_list = fz_malloc_array(ctx, xref_len + 3, sizeof(fz_off_t));
opts->gen_list = fz_calloc(ctx, xref_len + 3, sizeof(int));
opts->renumber_map = fz_malloc_array(ctx, xref_len + 3, sizeof(int));
opts->rev_renumber_map = fz_malloc_array(ctx, xref_len + 3, sizeof(int));
opts->rev_gen_list = fz_malloc_array(ctx, xref_len + 3, sizeof(int));
opts->continue_on_error = fz_opts->continue_on_error;
opts->errors = fz_opts->errors;
for (num = 0; num < xref_len; num++)
{
opts->use_list[num] = 0;
opts->ofs_list[num] = 0;
opts->renumber_map[num] = num;
opts->rev_renumber_map[num] = num;
opts->rev_gen_list[num] = pdf_get_xref_entry(ctx, doc, num)->gen;
}
}
/* Free the resources held by the dynamic write options */
static void finalise_write_options(fz_context *ctx, pdf_write_options *opts)
{
fz_free(ctx, opts->use_list);
fz_free(ctx, opts->ofs_list);
fz_free(ctx, opts->gen_list);
fz_free(ctx, opts->renumber_map);
fz_free(ctx, opts->rev_renumber_map);
fz_free(ctx, opts->rev_gen_list);
pdf_drop_obj(ctx, opts->linear_l);
pdf_drop_obj(ctx, opts->linear_h0);
pdf_drop_obj(ctx, opts->linear_h1);
pdf_drop_obj(ctx, opts->linear_o);
pdf_drop_obj(ctx, opts->linear_e);
pdf_drop_obj(ctx, opts->linear_n);
pdf_drop_obj(ctx, opts->linear_t);
pdf_drop_obj(ctx, opts->hints_s);
pdf_drop_obj(ctx, opts->hints_length);
page_objects_list_destroy(ctx, opts->page_object_lists);
if (opts->out)
fclose(opts->out);
}
void pdf_write_document(fz_context *ctx, pdf_document *doc, char *filename, fz_write_options *fz_opts)
{
fz_write_options opts_defaults = { 0 };
pdf_write_options opts = { 0 };
int lastfree;
int num;
int xref_len;
if (!doc)
return;
if (!fz_opts)
fz_opts = &opts_defaults;
if (fz_opts->do_incremental && fz_opts->do_garbage)
fz_throw(ctx, FZ_ERROR_GENERIC, "Can't do incremental writes with garbage collection");
if (fz_opts->do_incremental && fz_opts->do_linear)
fz_throw(ctx, FZ_ERROR_GENERIC, "Can't do incremental writes with linearisation");
doc->freeze_updates = 1;
/* Sanitize the operator streams */
if (fz_opts->do_clean)
sanitize(ctx, doc, fz_opts->do_ascii);
pdf_finish_edit(ctx, doc);
presize_unsaved_signature_byteranges(ctx, doc);
xref_len = pdf_xref_len(ctx, doc);
if (fz_opts->do_incremental)
{
/* If no changes, nothing to write */
if (doc->num_incremental_sections == 0)
return;
opts.out = fz_fopen(filename, "ab");
if (opts.out)
{
fz_fseek(opts.out, 0, SEEK_END);
fputs("\n", opts.out);
}
}
else
{
opts.out = fz_fopen(filename, "wb");
}
if (!opts.out)
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot open output file '%s'", filename);
fz_try(ctx)
{
initialise_write_options(ctx, doc, fz_opts, &opts);
/* Make sure any objects hidden in compressed streams have been loaded */
if (!opts.do_incremental)
{
pdf_ensure_solid_xref(ctx, doc, xref_len);
preloadobjstms(ctx, doc);
}
/* Sweep & mark objects from the trailer */
if (opts.do_garbage >= 1 || opts.do_linear)
(void)markobj(ctx, doc, &opts, pdf_trailer(ctx, doc));
else
for (num = 0; num < xref_len; num++)
opts.use_list[num] = 1;
/* Coalesce and renumber duplicate objects */
if (opts.do_garbage >= 3)
removeduplicateobjs(ctx, doc, &opts);
/* Compact xref by renumbering and removing unused objects */
if (opts.do_garbage >= 2 || opts.do_linear)
compactxref(ctx, doc, &opts);
/* Make renumbering affect all indirect references and update xref */
if (opts.do_garbage >= 2 || opts.do_linear)
renumberobjs(ctx, doc, &opts);
/* Truncate the xref after compacting and renumbering */
if ((opts.do_garbage >= 2 || opts.do_linear) && !opts.do_incremental)
while (xref_len > 0 && !opts.use_list[xref_len-1])
xref_len--;
if (opts.do_linear)
linearize(ctx, doc, &opts);
if (opts.do_incremental)
{
int i;
doc->disallow_new_increments = 1;
for (i = 0; i < doc->num_incremental_sections; i++)
{
doc->xref_base = doc->num_incremental_sections - i - 1;
writeobjects(ctx, doc, &opts, 0);
#ifdef DEBUG_WRITING
dump_object_details(ctx, doc, &opts);
#endif
for (num = 0; num < xref_len; num++)
{
if (!opts.use_list[num] && pdf_xref_is_incremental(ctx, doc, num))
{
/* Make unreusable. FIXME: would be better to link to existing free list */
opts.gen_list[num] = 65535;
opts.ofs_list[num] = 0;
}
}
opts.first_xref_offset = fz_ftell(opts.out);
if (doc->has_xref_streams)
writexrefstream(ctx, doc, &opts, 0, xref_len, 1, 0, opts.first_xref_offset);
else
writexref(ctx, doc, &opts, 0, xref_len, 1, 0, opts.first_xref_offset);
doc->xref_sections[doc->xref_base].end_ofs = fz_ftell(opts.out);
}
doc->xref_base = 0;
doc->disallow_new_increments = 0;
}
else
{
writeobjects(ctx, doc, &opts, 0);
#ifdef DEBUG_WRITING
dump_object_details(ctx, doc, &opts);
#endif
/* Construct linked list of free object slots */
lastfree = 0;
for (num = 0; num < xref_len; num++)
{
if (!opts.use_list[num])
{
opts.gen_list[num]++;
opts.ofs_list[lastfree] = num;
lastfree = num;
}
}
if (opts.do_linear)
{
opts.main_xref_offset = fz_ftell(opts.out);
writexref(ctx, doc, &opts, 0, opts.start, 0, 0, opts.first_xref_offset);
opts.file_len = fz_ftell(opts.out);
make_hint_stream(ctx, doc, &opts);
if (opts.do_ascii)
{
opts.hintstream_len *= 2;
opts.hintstream_len += 1 + ((opts.hintstream_len+63)>>6);
}
opts.file_len += opts.hintstream_len;
opts.main_xref_offset += opts.hintstream_len;
update_linearization_params(ctx, doc, &opts);
fz_fseek(opts.out, 0, 0);
writeobjects(ctx, doc, &opts, 1);
padto(opts.out, opts.main_xref_offset);
writexref(ctx, doc, &opts, 0, opts.start, 0, 0, opts.first_xref_offset);
}
else
{
opts.first_xref_offset = fz_ftell(opts.out);
writexref(ctx, doc, &opts, 0, xref_len, 1, 0, opts.first_xref_offset);
}
doc->xref_sections[0].end_ofs = fz_ftell(opts.out);
}
fclose(opts.out);
opts.out = NULL;
complete_signatures(ctx, doc, &opts, filename);
doc->dirty = 0;
}
fz_always(ctx)
{
#ifdef DEBUG_LINEARIZATION
page_objects_dump(&opts);
objects_dump(ctx, doc, &opts);
#endif
finalise_write_options(ctx, &opts);
doc->freeze_updates = 0;
}
fz_catch(ctx)
{
fz_rethrow(ctx);
}
}
#define KIDS_PER_LEVEL 32
#if 0
// TODO: pdf_rebalance_page_tree(ctx, doc);
static pdf_obj *
make_page_tree_node(fz_context *ctx, pdf_document *doc, int l, int r, pdf_obj *parent_ref, int root)
{
int count_per_kid, spaces;
pdf_obj *a = NULL;
pdf_obj *me = NULL;
pdf_obj *o = NULL;
pdf_obj *me_ref = NULL;
count_per_kid = 1;
while(count_per_kid * KIDS_PER_LEVEL < r-l)
count_per_kid *= KIDS_PER_LEVEL;
fz_var(o);
fz_var(me);
fz_var(a);
fz_var(me_ref);
fz_try(ctx)
{
me = pdf_new_dict(ctx, doc, 2);
pdf_dict_put_drop(ctx, me, PDF_NAME_Type, PDF_NAME_Pages);
pdf_dict_put_drop(ctx, me, PDF_NAME_Count, pdf_new_int(ctx, doc, r-l));
if (!root)
pdf_dict_put(ctx, me, PDF_NAME_Parent, parent_ref);
a = pdf_new_array(ctx, doc, KIDS_PER_LEVEL);
me_ref = pdf_new_ref(ctx, doc, me);
for (spaces = KIDS_PER_LEVEL; l < r; spaces--)
{
if (spaces >= r-l)
{
o = pdf_keep_obj(ctx, doc->page_refs[l++]);
pdf_dict_put(ctx, o, PDF_NAME_Parent, me_ref);
}
else
{
int j = l+count_per_kid;
if (j > r)
j = r;
o = make_page_tree_node(ctx, doc, l, j, me_ref, 0);
l = j;
}
pdf_array_push(ctx, a, o);
pdf_drop_obj(ctx, o);
o = NULL;
}
pdf_dict_put_drop(ctx, me, PDF_NAME_Kids, a);
a = NULL;
}
fz_always(ctx)
{
pdf_drop_obj(ctx, me);
}
fz_catch(ctx)
{
pdf_drop_obj(ctx, a);
pdf_drop_obj(ctx, o);
pdf_drop_obj(ctx, me);
fz_rethrow_message(ctx, "Failed to synthesize new page tree");
}
return me_ref;
}
static void
pdf_rebalance_page_tree(fz_context *ctx, pdf_document *doc)
{
pdf_obj *catalog;
pdf_obj *pages;
if (!doc || !doc->needs_page_tree_rebuild)
return;
catalog = pdf_dict_get(ctx, pdf_trailer(ctx, doc), PDF_NAME_Root);
pages = make_page_tree_node(ctx, doc, 0, doc->page_len, catalog, 1);
pdf_dict_put_drop(ctx, catalog, PDF_NAME_Pages, pages);
doc->needs_page_tree_rebuild = 0;
}
#endif
static void
pdf_rebalance_page_tree(fz_context *ctx, pdf_document *doc)
{
}
void pdf_finish_edit(fz_context *ctx, pdf_document *doc)
{
if (!doc)
return;
pdf_rebalance_page_tree(ctx, doc);
}
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