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
|
/*
* pdfextract -- the ultimate way to extract images and fonts from pdfs
*/
#include "mupdf/pdf.h"
static pdf_document *doc = NULL;
static fz_context *ctx = NULL;
static int dorgb = 0;
static void usage(void)
{
fprintf(stderr, "usage: mutool extract [options] file.pdf [object numbers]\n");
fprintf(stderr, "\t-p\tpassword\n");
fprintf(stderr, "\t-r\tconvert images to rgb\n");
exit(1);
}
static int isimage(pdf_obj *obj)
{
pdf_obj *type = pdf_dict_get(ctx, obj, PDF_NAME_Subtype);
return pdf_name_eq(ctx, type, PDF_NAME_Image);
}
static int isfontdesc(pdf_obj *obj)
{
pdf_obj *type = pdf_dict_get(ctx, obj, PDF_NAME_Type);
return pdf_name_eq(ctx, type, PDF_NAME_FontDescriptor);
}
static void writepixmap(fz_context *ctx, fz_pixmap *pix, char *file, int rgb)
{
char buf[1024];
fz_pixmap *converted = NULL;
if (!pix)
return;
if (rgb && pix->colorspace && pix->colorspace != fz_device_rgb(ctx))
{
fz_irect bbox;
converted = fz_new_pixmap_with_bbox(ctx, fz_device_rgb(ctx), fz_pixmap_bbox(ctx, pix, &bbox), pix->alpha);
fz_convert_pixmap(ctx, converted, pix);
pix = converted;
}
if (pix->n <= 4)
{
snprintf(buf, sizeof(buf), "%s.png", file);
printf("extracting image %s\n", buf);
fz_save_pixmap_as_png(ctx, pix, buf);
}
else
{
snprintf(buf, sizeof(buf), "%s.pam", file);
printf("extracting image %s\n", buf);
fz_save_pixmap_as_pam(ctx, pix, buf);
}
fz_drop_pixmap(ctx, converted);
}
static void saveimage(int num)
{
fz_image *image = NULL;
fz_pixmap *pix = NULL;
pdf_obj *ref;
char buf[32];
ref = pdf_new_indirect(ctx, doc, num, 0);
fz_var(image);
fz_var(pix);
fz_try(ctx)
{
/* TODO: detect DCTD and save as jpeg */
image = pdf_load_image(ctx, doc, ref);
pix = fz_get_pixmap_from_image(ctx, image, NULL, NULL, 0, 0);
snprintf(buf, sizeof(buf), "img-%04d", num);
writepixmap(ctx, pix, buf, dorgb);
}
fz_always(ctx)
{
fz_drop_image(ctx, image);
fz_drop_pixmap(ctx, pix);
pdf_drop_obj(ctx, ref);
}
fz_catch(ctx)
fz_rethrow(ctx);
}
static void savefont(pdf_obj *dict, int num)
{
char namebuf[1024];
fz_buffer *buf;
pdf_obj *stream = NULL;
pdf_obj *obj;
char *ext = "";
fz_output *out;
char *fontname = "font";
size_t len;
unsigned char *data;
obj = pdf_dict_get(ctx, dict, PDF_NAME_FontName);
if (obj)
fontname = pdf_to_name(ctx, obj);
obj = pdf_dict_get(ctx, dict, PDF_NAME_FontFile);
if (obj)
{
stream = obj;
ext = "pfa";
}
obj = pdf_dict_get(ctx, dict, PDF_NAME_FontFile2);
if (obj)
{
stream = obj;
ext = "ttf";
}
obj = pdf_dict_get(ctx, dict, PDF_NAME_FontFile3);
if (obj)
{
stream = obj;
obj = pdf_dict_get(ctx, obj, PDF_NAME_Subtype);
if (obj && !pdf_is_name(ctx, obj))
fz_throw(ctx, FZ_ERROR_GENERIC, "invalid font descriptor subtype");
if (pdf_name_eq(ctx, obj, PDF_NAME_Type1C))
ext = "cff";
else if (pdf_name_eq(ctx, obj, PDF_NAME_CIDFontType0C))
ext = "cid";
else if (pdf_name_eq(ctx, obj, PDF_NAME_OpenType))
ext = "otf";
else
fz_throw(ctx, FZ_ERROR_GENERIC, "unhandled font type '%s'", pdf_to_name(ctx, obj));
}
if (!stream)
{
fz_warn(ctx, "unhandled font type");
return;
}
buf = pdf_load_stream(ctx, doc, pdf_to_num(ctx, stream));
len = fz_buffer_storage(ctx, buf, &data);
fz_try(ctx)
{
snprintf(namebuf, sizeof(namebuf), "%s-%04d.%s", fontname, num, ext);
printf("extracting font %s\n", namebuf);
out = fz_new_output_with_path(ctx, namebuf, 0);
fz_try(ctx)
fz_write(ctx, out, data, len);
fz_always(ctx)
fz_drop_output(ctx, out);
fz_catch(ctx)
fz_rethrow(ctx);
}
fz_always(ctx)
fz_drop_buffer(ctx, buf);
fz_catch(ctx)
fz_rethrow(ctx);
}
static void showobject(int num)
{
pdf_obj *obj;
if (!doc)
fz_throw(ctx, FZ_ERROR_GENERIC, "no file specified");
fz_try(ctx)
{
obj = pdf_load_object(ctx, doc, num);
if (isimage(obj))
saveimage(num);
else if (isfontdesc(obj))
savefont(obj, num);
pdf_drop_obj(ctx, obj);
}
fz_catch(ctx)
{
fz_warn(ctx, "ignoring object %d", num);
}
}
int pdfextract_main(int argc, char **argv)
{
char *infile;
char *password = "";
int c, o;
while ((c = fz_getopt(argc, argv, "p:r")) != -1)
{
switch (c)
{
case 'p': password = fz_optarg; break;
case 'r': dorgb++; break;
default: usage(); break;
}
}
if (fz_optind == argc)
usage();
infile = argv[fz_optind++];
ctx = fz_new_context(NULL, NULL, FZ_STORE_UNLIMITED);
if (!ctx)
{
fprintf(stderr, "cannot initialise context\n");
exit(1);
}
doc = pdf_open_document(ctx, infile);
if (pdf_needs_password(ctx, doc))
if (!pdf_authenticate_password(ctx, doc, password))
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot authenticate password: %s", infile);
if (fz_optind == argc)
{
int len = pdf_count_objects(ctx, doc);
for (o = 1; o < len; o++)
showobject(o);
}
else
{
while (fz_optind < argc)
{
showobject(atoi(argv[fz_optind]));
fz_optind++;
}
}
pdf_drop_document(ctx, doc);
fz_flush_warnings(ctx);
fz_drop_context(ctx);
return 0;
}
|
