static void renumberobj(fz_obj *obj)
{
int i;
fz_context *ctx = xref->ctx;
if (fz_is_dict(obj))
{
int n = fz_dict_len(obj);
for (i = 0; i < n; i++)
{
fz_obj *key = fz_dict_get_key(obj, i);
fz_obj *val = fz_dict_get_val(obj, i);
if (fz_is_indirect(val))
{
val = fz_new_indirect(ctx, renumbermap[fz_to_num(val)], 0, xref);
fz_dict_put(obj, key, val);
fz_drop_obj(val);
}
else
{
renumberobj(val);
}
}
}
else if (fz_is_array(obj))
{
int n = fz_array_len(obj);
for (i = 0; i < n; i++)
{
fz_obj *val = fz_array_get(obj, i);
if (fz_is_indirect(val))
{
val = fz_new_indirect(ctx, renumbermap[fz_to_num(val)], 0, xref);
fz_array_put(obj, i, val);
fz_drop_obj(val);
}
else
{
renumberobj(val);
}
}
}
}
static void renumberobjs(void)
{
pdf_xref_entry *oldxref;
int newlen;
int num;
/* Apply renumber map to indirect references in all objects in xref */
renumberobj(xref->trailer);
for (num = 0; num < xref->len; num++)
{
fz_obj *obj = xref->table[num].obj;
if (fz_is_indirect(obj))
{
obj = fz_new_indirect(ctx, renumbermap[fz_to_num(obj)], 0, xref);
pdf_update_object(xref, num, 0, obj);
fz_drop_obj(obj);
}
else
{
renumberobj(obj);
}
}
/* Create new table for the reordered, compacted xref */
oldxref = xref->table;
xref->table = fz_malloc_array(xref->ctx, xref->len, sizeof(pdf_xref_entry));
xref->table[0] = oldxref[0];
/* Move used objects into the new compacted xref */
newlen = 0;
for (num = 1; num < xref->len; num++)
{
if (uselist[num])
{
if (newlen < renumbermap[num])
newlen = renumbermap[num];
xref->table[renumbermap[num]] = oldxref[num];
}
else
{
if (oldxref[num].obj)
fz_drop_obj(oldxref[num].obj);
}
}
fz_free(xref->ctx, oldxref);
/* Update the used objects count in compacted xref */
xref->len = newlen + 1;
/* Update list of used objects to fit with compacted xref */
for (num = 1; num < xref->len; num++)
uselist[num] = 1;
}
static void saveimage(int num)
{
fz_error error;
fz_pixmap *img;
fz_obj *ref;
char name[1024];
ref = fz_new_indirect(ctx, num, 0, xref);
/* TODO: detect DCTD and save as jpeg */
error = pdf_load_image(&img, xref, ref);
if (error)
die(error);
if (dorgb && img->colorspace && img->colorspace != fz_device_rgb)
{
fz_pixmap *temp;
temp = fz_new_pixmap_with_rect(ctx, fz_device_rgb, fz_bound_pixmap(img));
fz_convert_pixmap(ctx, img, temp);
fz_drop_pixmap(ctx, img);
img = temp;
}
if (img->n <= 4)
{
sprintf(name, "img-%04d.png", num);
printf("extracting image %s\n", name);
fz_write_png(ctx, img, name, 0);
}
else
{
sprintf(name, "img-%04d.pam", num);
printf("extracting image %s\n", name);
fz_write_pam(ctx, img, name, 0);
}
fz_drop_pixmap(ctx, img);
fz_drop_obj(ctx, ref);
}
static void retainpages(int argc, char **argv)
{
fz_obj *oldroot, *root, *pages, *kids, *countobj, *parent, *olddests;
/* Keep only pages/type and (reduced) dest entries to avoid
* references to unretained pages */
oldroot = fz_dict_gets(xref->trailer, "Root");
pages = fz_dict_gets(oldroot, "Pages");
olddests = pdf_load_name_tree(xref, "Dests");
root = fz_new_dict(ctx, 2);
fz_dict_puts(root, "Type", fz_dict_gets(oldroot, "Type"));
fz_dict_puts(root, "Pages", fz_dict_gets(oldroot, "Pages"));
pdf_update_object(xref, fz_to_num(oldroot), fz_to_gen(oldroot), root);
fz_drop_obj(root);
/* Create a new kids array with only the pages we want to keep */
parent = fz_new_indirect(ctx, fz_to_num(pages), fz_to_gen(pages), xref);
kids = fz_new_array(ctx, 1);
/* Retain pages specified */
while (argc - fz_optind)
{
int page, spage, epage;
char *spec, *dash;
char *pagelist = argv[fz_optind];
spec = fz_strsep(&pagelist, ",");
while (spec)
{
dash = strchr(spec, '-');
if (dash == spec)
spage = epage = pdf_count_pages(xref);
else
spage = epage = atoi(spec);
if (dash)
{
if (strlen(dash) > 1)
epage = atoi(dash + 1);
else
epage = pdf_count_pages(xref);
}
if (spage > epage)
page = spage, spage = epage, epage = page;
if (spage < 1)
spage = 1;
if (epage > pdf_count_pages(xref))
epage = pdf_count_pages(xref);
for (page = spage; page <= epage; page++)
{
fz_obj *pageobj = xref->page_objs[page-1];
fz_obj *pageref = xref->page_refs[page-1];
fz_dict_puts(pageobj, "Parent", parent);
/* Store page object in new kids array */
fz_array_push(kids, pageref);
}
spec = fz_strsep(&pagelist, ",");
}
fz_optind++;
}
fz_drop_obj(parent);
/* Update page count and kids array */
countobj = fz_new_int(ctx, fz_array_len(kids));
fz_dict_puts(pages, "Count", countobj);
fz_drop_obj(countobj);
fz_dict_puts(pages, "Kids", kids);
fz_drop_obj(kids);
/* Also preserve the (partial) Dests name tree */
if (olddests)
{
int i;
fz_obj *names = fz_new_dict(ctx, 1);
fz_obj *dests = fz_new_dict(ctx, 1);
fz_obj *names_list = fz_new_array(ctx, 32);
for (i = 0; i < fz_dict_len(olddests); i++)
{
fz_obj *key = fz_dict_get_key(olddests, i);
fz_obj *val = fz_dict_get_val(olddests, i);
fz_obj *key_str = fz_new_string(ctx, fz_to_name(key), strlen(fz_to_name(key)));
fz_obj *dest = fz_dict_gets(val, "D");
dest = fz_array_get(dest ? dest : val, 0);
if (fz_array_contains(fz_dict_gets(pages, "Kids"), dest))
{
fz_array_push(names_list, key_str);
fz_array_push(names_list, val);
}
fz_drop_obj(key_str);
}
root = fz_dict_gets(xref->trailer, "Root");
fz_dict_puts(dests, "Names", names_list);
fz_dict_puts(names, "Dests", dests);
fz_dict_puts(root, "Names", names);
fz_drop_obj(names);
fz_drop_obj(dests);
fz_drop_obj(names_list);
fz_drop_obj(olddests);
}
}
fz_error
pdf_open_xref_with_stream(pdf_xref **xrefp, fz_stream *file, char *password)
{
pdf_xref *xref;
fz_error error;
fz_obj *encrypt, *id;
fz_obj *dict, *obj;
int i, repaired = 0;
/* install pdf specific callback */
fz_resolve_indirect = pdf_resolve_indirect;
xref = fz_malloc(sizeof(pdf_xref));
memset(xref, 0, sizeof(pdf_xref));
xref->file = fz_keep_stream(file);
error = pdf_load_xref(xref, xref->scratch, sizeof xref->scratch);
if (error)
{
fz_catch(error, "trying to repair");
if (xref->table)
{
fz_free(xref->table);
xref->table = NULL;
xref->len = 0;
}
if (xref->trailer)
{
fz_drop_obj(xref->trailer);
xref->trailer = NULL;
}
error = pdf_repair_xref(xref, xref->scratch, sizeof xref->scratch);
if (error)
{
pdf_free_xref(xref);
return fz_rethrow(error, "cannot repair document");
}
repaired = 1;
}
encrypt = fz_dict_gets(xref->trailer, "Encrypt");
id = fz_dict_gets(xref->trailer, "ID");
if (fz_is_dict(encrypt))
{
error = pdf_new_crypt(&xref->crypt, encrypt, id);
if (error)
{
pdf_free_xref(xref);
return fz_rethrow(error, "cannot decrypt document");
}
}
if (pdf_needs_password(xref))
{
/* Only care if we have a password */
if (password)
{
int okay = pdf_authenticate_password(xref, password);
if (!okay)
{
pdf_free_xref(xref);
return fz_throw("invalid password");
}
}
}
if (repaired)
{
int hasroot, hasinfo;
error = pdf_repair_obj_stms(xref);
if (error)
{
pdf_free_xref(xref);
return fz_rethrow(error, "cannot repair document");
}
hasroot = fz_dict_gets(xref->trailer, "Root") != NULL;
hasinfo = fz_dict_gets(xref->trailer, "Info") != NULL;
for (i = 1; i < xref->len; i++)
{
if (xref->table[i].type == 0 || xref->table[i].type == 'f')
continue;
error = pdf_load_object(&dict, xref, i, 0);
if (error)
{
fz_catch(error, "ignoring broken object (%d 0 R)", i);
continue;
}
if (!hasroot)
{
obj = fz_dict_gets(dict, "Type");
if (fz_is_name(obj) && !strcmp(fz_to_name(obj), "Catalog"))
{
obj = fz_new_indirect(i, 0, xref);
fz_dict_puts(xref->trailer, "Root", obj);
fz_drop_obj(obj);
}
}
if (!hasinfo)
{
if (fz_dict_gets(dict, "Creator") || fz_dict_gets(dict, "Producer"))
{
obj = fz_new_indirect(i, 0, xref);
fz_dict_puts(xref->trailer, "Info", obj);
fz_drop_obj(obj);
}
}
fz_drop_obj(dict);
}
}
error = pdf_read_ocg(xref);
if (error)
{
pdf_free_xref(xref);
return fz_rethrow(error, "Broken Optional Content");
}
*xrefp = xref;
return fz_okay;
}
fz_error
pdf_parse_ind_obj(fz_obj **op, pdf_xref *xref,
fz_stream *file, char *buf, int cap,
int *onum, int *ogen, int *ostmofs)
{
fz_error error = fz_okay;
fz_obj *obj = NULL;
int num = 0, gen = 0, stm_ofs;
int tok;
int len;
int a, b;
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
return fz_rethrow(error, "cannot parse indirect object (%d %d R)", num, gen);
if (tok != PDF_TOK_INT)
return fz_throw("expected object number (%d %d R)", num, gen);
num = atoi(buf);
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
return fz_rethrow(error, "cannot parse indirect object (%d %d R)", num, gen);
if (tok != PDF_TOK_INT)
return fz_throw("expected generation number (%d %d R)", num, gen);
gen = atoi(buf);
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
return fz_rethrow(error, "cannot parse indirect object (%d %d R)", num, gen);
if (tok != PDF_TOK_OBJ)
return fz_throw("expected 'obj' keyword (%d %d R)", num, gen);
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
return fz_rethrow(error, "cannot parse indirect object (%d %d R)", num, gen);
switch (tok)
{
case PDF_TOK_OPEN_ARRAY:
error = pdf_parse_array(&obj, xref, file, buf, cap);
if (error)
return fz_rethrow(error, "cannot parse indirect object (%d %d R)", num, gen);
break;
case PDF_TOK_OPEN_DICT:
error = pdf_parse_dict(&obj, xref, file, buf, cap);
if (error)
return fz_rethrow(error, "cannot parse indirect object (%d %d R)", num, gen);
break;
case PDF_TOK_NAME: obj = fz_new_name(buf); break;
case PDF_TOK_REAL: obj = fz_new_real(fz_atof(buf)); break;
case PDF_TOK_STRING: obj = fz_new_string(buf, len); break;
case PDF_TOK_TRUE: obj = fz_new_bool(1); break;
case PDF_TOK_FALSE: obj = fz_new_bool(0); break;
case PDF_TOK_NULL: obj = fz_new_null(); break;
case PDF_TOK_INT:
a = atoi(buf);
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
return fz_rethrow(error, "cannot parse indirect object (%d %d R)", num, gen);
if (tok == PDF_TOK_STREAM || tok == PDF_TOK_ENDOBJ)
{
obj = fz_new_int(a);
goto skip;
}
if (tok == PDF_TOK_INT)
{
b = atoi(buf);
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
return fz_rethrow(error, "cannot parse indirect object (%d %d R)", num, gen);
if (tok == PDF_TOK_R)
{
obj = fz_new_indirect(a, b, xref);
break;
}
}
return fz_throw("expected 'R' keyword (%d %d R)", num, gen);
case PDF_TOK_ENDOBJ:
obj = fz_new_null();
goto skip;
default:
return fz_throw("syntax error in object (%d %d R)", num, gen);
}
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
{
fz_drop_obj(obj);
return fz_rethrow(error, "cannot parse indirect object (%d %d R)", num, gen);
}
skip:
if (tok == PDF_TOK_STREAM)
{
int c = fz_read_byte(file);
while (c == ' ')
c = fz_read_byte(file);
if (c == '\r')
{
c = fz_peek_byte(file);
if (c != '\n')
fz_warn("line feed missing after stream begin marker (%d %d R)", num, gen);
else
fz_read_byte(file);
}
stm_ofs = fz_tell(file);
}
else if (tok == PDF_TOK_ENDOBJ)
{
stm_ofs = 0;
}
else
{
fz_warn("expected 'endobj' or 'stream' keyword (%d %d R)", num, gen);
stm_ofs = 0;
}
if (onum) *onum = num;
if (ogen) *ogen = gen;
if (ostmofs) *ostmofs = stm_ofs;
*op = obj;
return fz_okay;
}
fz_error
pdf_parse_dict(fz_obj **op, pdf_xref *xref, fz_stream *file, char *buf, int cap)
{
fz_error error = fz_okay;
fz_obj *dict = NULL;
fz_obj *key = NULL;
fz_obj *val = NULL;
int tok;
int len;
int a, b;
dict = fz_new_dict(8);
while (1)
{
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
{
fz_drop_obj(dict);
return fz_rethrow(error, "cannot parse dict");
}
skip:
if (tok == PDF_TOK_CLOSE_DICT)
{
*op = dict;
return fz_okay;
}
/* for BI .. ID .. EI in content streams */
if (tok == PDF_TOK_KEYWORD && !strcmp(buf, "ID"))
{
*op = dict;
return fz_okay;
}
if (tok != PDF_TOK_NAME)
{
fz_drop_obj(dict);
return fz_throw("invalid key in dict");
}
key = fz_new_name(buf);
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
{
fz_drop_obj(key);
fz_drop_obj(dict);
return fz_rethrow(error, "cannot parse dict");
}
switch (tok)
{
case PDF_TOK_OPEN_ARRAY:
error = pdf_parse_array(&val, xref, file, buf, cap);
if (error)
{
fz_drop_obj(key);
fz_drop_obj(dict);
return fz_rethrow(error, "cannot parse dict");
}
break;
case PDF_TOK_OPEN_DICT:
error = pdf_parse_dict(&val, xref, file, buf, cap);
if (error)
{
fz_drop_obj(key);
fz_drop_obj(dict);
return fz_rethrow(error, "cannot parse dict");
}
break;
case PDF_TOK_NAME: val = fz_new_name(buf); break;
case PDF_TOK_REAL: val = fz_new_real(fz_atof(buf)); break;
case PDF_TOK_STRING: val = fz_new_string(buf, len); break;
case PDF_TOK_TRUE: val = fz_new_bool(1); break;
case PDF_TOK_FALSE: val = fz_new_bool(0); break;
case PDF_TOK_NULL: val = fz_new_null(); break;
case PDF_TOK_INT:
/* 64-bit to allow for numbers > INT_MAX and overflow */
a = (int) strtoll(buf, 0, 10);
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
{
fz_drop_obj(key);
fz_drop_obj(dict);
return fz_rethrow(error, "cannot parse dict");
}
if (tok == PDF_TOK_CLOSE_DICT || tok == PDF_TOK_NAME ||
(tok == PDF_TOK_KEYWORD && !strcmp(buf, "ID")))
{
val = fz_new_int(a);
fz_dict_put(dict, key, val);
fz_drop_obj(val);
fz_drop_obj(key);
goto skip;
}
if (tok == PDF_TOK_INT)
{
b = atoi(buf);
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
{
fz_drop_obj(key);
fz_drop_obj(dict);
return fz_rethrow(error, "cannot parse dict");
}
if (tok == PDF_TOK_R)
{
val = fz_new_indirect(a, b, xref);
break;
}
}
fz_drop_obj(key);
fz_drop_obj(dict);
return fz_throw("invalid indirect reference in dict");
default:
fz_drop_obj(key);
fz_drop_obj(dict);
return fz_throw("unknown token in dict");
}
fz_dict_put(dict, key, val);
fz_drop_obj(val);
fz_drop_obj(key);
}
}
fz_error
pdf_parse_array(fz_obj **op, pdf_xref *xref, fz_stream *file, char *buf, int cap)
{
fz_error error = fz_okay;
fz_obj *ary = NULL;
fz_obj *obj = NULL;
int a = 0, b = 0, n = 0;
int tok;
int len;
ary = fz_new_array(4);
while (1)
{
error = pdf_lex(&tok, file, buf, cap, &len);
if (error)
{
fz_drop_obj(ary);
return fz_rethrow(error, "cannot parse array");
}
if (tok != PDF_TOK_INT && tok != PDF_TOK_R)
{
if (n > 0)
{
obj = fz_new_int(a);
fz_array_push(ary, obj);
fz_drop_obj(obj);
}
if (n > 1)
{
obj = fz_new_int(b);
fz_array_push(ary, obj);
fz_drop_obj(obj);
}
n = 0;
}
if (tok == PDF_TOK_INT && n == 2)
{
obj = fz_new_int(a);
fz_array_push(ary, obj);
fz_drop_obj(obj);
a = b;
n --;
}
switch (tok)
{
case PDF_TOK_CLOSE_ARRAY:
*op = ary;
return fz_okay;
case PDF_TOK_INT:
if (n == 0)
a = atoi(buf);
if (n == 1)
b = atoi(buf);
n ++;
break;
case PDF_TOK_R:
if (n != 2)
{
fz_drop_obj(ary);
return fz_throw("cannot parse indirect reference in array");
}
obj = fz_new_indirect(a, b, xref);
fz_array_push(ary, obj);
fz_drop_obj(obj);
n = 0;
break;
case PDF_TOK_OPEN_ARRAY:
error = pdf_parse_array(&obj, xref, file, buf, cap);
if (error)
{
fz_drop_obj(ary);
return fz_rethrow(error, "cannot parse array");
}
fz_array_push(ary, obj);
fz_drop_obj(obj);
break;
case PDF_TOK_OPEN_DICT:
error = pdf_parse_dict(&obj, xref, file, buf, cap);
if (error)
{
fz_drop_obj(ary);
return fz_rethrow(error, "cannot parse array");
}
fz_array_push(ary, obj);
fz_drop_obj(obj);
break;
case PDF_TOK_NAME:
obj = fz_new_name(buf);
fz_array_push(ary, obj);
fz_drop_obj(obj);
break;
case PDF_TOK_REAL:
obj = fz_new_real(fz_atof(buf));
fz_array_push(ary, obj);
fz_drop_obj(obj);
break;
case PDF_TOK_STRING:
obj = fz_new_string(buf, len);
fz_array_push(ary, obj);
fz_drop_obj(obj);
break;
case PDF_TOK_TRUE:
obj = fz_new_bool(1);
fz_array_push(ary, obj);
fz_drop_obj(obj);
break;
case PDF_TOK_FALSE:
obj = fz_new_bool(0);
fz_array_push(ary, obj);
fz_drop_obj(obj);
break;
case PDF_TOK_NULL:
obj = fz_new_null();
fz_array_push(ary, obj);
fz_drop_obj(obj);
break;
default:
fz_drop_obj(ary);
return fz_throw("cannot parse token in array");
}
}
}