1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
|
/*
* PDF cleaning tool: general purpose pdf syntax washer.
*
* Rewrite PDF with pretty printed objects.
* Garbage collect unreachable objects.
* Inflate compressed streams.
* Create subset documents.
*
* TODO: linearize document for fast web view
*/
#include "mupdf/pdf.h"
typedef struct globals_s
{
pdf_document *doc;
fz_context *ctx;
} globals;
static void usage(void)
{
fprintf(stderr,
"usage: mutool clean [options] input.pdf [output.pdf] [pages]\n"
"\t-p -\tpassword\n"
"\t-g\tgarbage collect unused objects\n"
"\t-gg\tin addition to -g compact xref table\n"
"\t-ggg\tin addition to -gg merge duplicate objects\n"
"\t-d\tdecompress all streams\n"
"\t-l\tlinearize PDF\n"
"\t-i\ttoggle decompression of image streams\n"
"\t-f\ttoggle decompression of font streams\n"
"\t-a\tascii hex encode binary streams\n"
"\tpages\tcomma separated list of ranges\n");
exit(1);
}
static int
string_in_names_list(pdf_obj *p, pdf_obj *names_list)
{
int n = pdf_array_len(names_list);
int i;
char *str = pdf_to_str_buf(p);
for (i = 0; i < n ; i += 2)
{
if (!strcmp(pdf_to_str_buf(pdf_array_get(names_list, i)), str))
return 1;
}
return 0;
}
/*
* Recreate page tree to only retain specified pages.
*/
static void retainpages(globals *glo, int argc, char **argv)
{
pdf_obj *oldroot, *root, *pages, *kids, *countobj, *parent, *olddests;
pdf_document *doc = glo->doc;
int argidx = 0;
pdf_obj *names_list = NULL;
int pagecount;
int i;
/* Keep only pages/type and (reduced) dest entries to avoid
* references to unretained pages */
oldroot = pdf_dict_gets(pdf_trailer(doc), "Root");
pages = pdf_dict_gets(oldroot, "Pages");
olddests = pdf_load_name_tree(doc, "Dests");
root = pdf_new_dict(doc, 2);
pdf_dict_puts(root, "Type", pdf_dict_gets(oldroot, "Type"));
pdf_dict_puts(root, "Pages", pdf_dict_gets(oldroot, "Pages"));
pdf_update_object(doc, pdf_to_num(oldroot), root);
pdf_drop_obj(root);
/* Create a new kids array with only the pages we want to keep */
parent = pdf_new_indirect(doc, pdf_to_num(pages), pdf_to_gen(pages));
kids = pdf_new_array(doc, 1);
/* Retain pages specified */
while (argc - argidx)
{
int page, spage, epage;
char *spec, *dash;
char *pagelist = argv[argidx];
pagecount = pdf_count_pages(doc);
spec = fz_strsep(&pagelist, ",");
while (spec)
{
dash = strchr(spec, '-');
if (dash == spec)
spage = epage = pagecount;
else
spage = epage = atoi(spec);
if (dash)
{
if (strlen(dash) > 1)
epage = atoi(dash + 1);
else
epage = pagecount;
}
if (spage > epage)
page = spage, spage = epage, epage = page;
spage = fz_clampi(spage, 1, pagecount);
epage = fz_clampi(epage, 1, pagecount);
for (page = spage; page <= epage; page++)
{
pdf_obj *pageref = pdf_lookup_page_obj(doc, page-1);
pdf_obj *pageobj = pdf_resolve_indirect(pageref);
pdf_dict_puts(pageobj, "Parent", parent);
/* Store page object in new kids array */
pdf_array_push(kids, pageref);
}
spec = fz_strsep(&pagelist, ",");
}
argidx++;
}
pdf_drop_obj(parent);
/* Update page count and kids array */
countobj = pdf_new_int(doc, pdf_array_len(kids));
pdf_dict_puts(pages, "Count", countobj);
pdf_drop_obj(countobj);
pdf_dict_puts(pages, "Kids", kids);
pdf_drop_obj(kids);
/* Also preserve the (partial) Dests name tree */
if (olddests)
{
pdf_obj *names = pdf_new_dict(doc, 1);
pdf_obj *dests = pdf_new_dict(doc, 1);
int len = pdf_dict_len(olddests);
names_list = pdf_new_array(doc, 32);
for (i = 0; i < len; i++)
{
pdf_obj *key = pdf_dict_get_key(olddests, i);
pdf_obj *val = pdf_dict_get_val(olddests, i);
pdf_obj *dest = pdf_dict_gets(val, "D");
dest = pdf_array_get(dest ? dest : val, 0);
if (pdf_array_contains(pdf_dict_gets(pages, "Kids"), dest))
{
pdf_obj *key_str = pdf_new_string(doc, pdf_to_name(key), strlen(pdf_to_name(key)));
pdf_array_push(names_list, key_str);
pdf_array_push(names_list, val);
pdf_drop_obj(key_str);
}
}
root = pdf_dict_gets(pdf_trailer(doc), "Root");
pdf_dict_puts(dests, "Names", names_list);
pdf_dict_puts(names, "Dests", dests);
pdf_dict_puts(root, "Names", names);
pdf_drop_obj(names);
pdf_drop_obj(dests);
pdf_drop_obj(names_list);
pdf_drop_obj(olddests);
}
/* Force the next call to pdf_count_pages to recount */
glo->doc->page_count = 0;
/* Edit each pages /Annot list to remove any links that point to
* nowhere. */
pagecount = pdf_count_pages(doc);
for (i = 0; i < pagecount; i++)
{
pdf_obj *pageref = pdf_lookup_page_obj(doc, i);
pdf_obj *pageobj = pdf_resolve_indirect(pageref);
pdf_obj *annots = pdf_dict_gets(pageobj, "Annots");
int len = pdf_array_len(annots);
int j;
for (j = 0; j < len; j++)
{
pdf_obj *o = pdf_array_get(annots, j);
pdf_obj *p;
if (strcmp(pdf_to_name(pdf_dict_gets(o, "Subtype")), "Link"))
continue;
p = pdf_dict_gets(o, "A");
if (strcmp(pdf_to_name(pdf_dict_gets(p, "S")), "GoTo"))
continue;
if (string_in_names_list(pdf_dict_gets(p, "D"), names_list))
continue;
/* FIXME: Should probably look at Next too */
/* Remove this annotation */
pdf_array_delete(annots, j);
j--;
}
}
}
void pdfclean_clean(fz_context *ctx, char *infile, char *outfile, char *password, fz_write_options *opts, char *argv[], int argc)
{
globals glo = { 0 };
glo.ctx = ctx;
fz_try(ctx)
{
glo.doc = pdf_open_document_no_run(ctx, infile);
if (pdf_needs_password(glo.doc))
if (!pdf_authenticate_password(glo.doc, password))
fz_throw(glo.ctx, FZ_ERROR_GENERIC, "cannot authenticate password: %s", infile);
/* Only retain the specified subset of the pages */
if (argc)
retainpages(&glo, argc, argv);
pdf_write_document(glo.doc, outfile, opts);
}
fz_always(ctx)
{
pdf_close_document(glo.doc);
}
fz_catch(ctx)
{
if (opts && opts->errors)
*opts->errors = *opts->errors+1;
}
}
int pdfclean_main(int argc, char **argv)
{
char *infile;
char *outfile = "out.pdf";
char *password = "";
int c;
fz_write_options opts;
int errors = 0;
fz_context *ctx;
opts.do_incremental = 0;
opts.do_garbage = 0;
opts.do_expand = 0;
opts.do_ascii = 0;
opts.do_linear = 0;
opts.continue_on_error = 1;
opts.errors = &errors;
while ((c = fz_getopt(argc, argv, "adfgilp:")) != -1)
{
switch (c)
{
case 'p': password = fz_optarg; break;
case 'g': opts.do_garbage ++; break;
case 'd': opts.do_expand ^= fz_expand_all; break;
case 'f': opts.do_expand ^= fz_expand_fonts; break;
case 'i': opts.do_expand ^= fz_expand_images; break;
case 'l': opts.do_linear ++; break;
case 'a': opts.do_ascii ++; break;
default: usage(); break;
}
}
if (argc - fz_optind < 1)
usage();
infile = argv[fz_optind++];
if (argc - fz_optind > 0 &&
(strstr(argv[fz_optind], ".pdf") || strstr(argv[fz_optind], ".PDF")))
{
outfile = argv[fz_optind++];
}
ctx = fz_new_context(NULL, NULL, FZ_STORE_UNLIMITED);
if (!ctx)
{
fprintf(stderr, "cannot initialise context\n");
exit(1);
}
fz_try(ctx)
{
pdfclean_clean(ctx, infile, outfile, password, &opts, &argv[fz_optind], argc - fz_optind);
}
fz_catch(ctx)
{
errors++;
}
fz_free_context(ctx);
return errors == 0;
}
|