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
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
|
/* Copyright (C) 2001-2019 Artifex Software, Inc.
All Rights Reserved.
This software is provided AS-IS with no warranty, either express or
implied.
This software is distributed under license and may not be copied,
modified or distributed except as expressly authorized under the terms
of the license contained in the file LICENSE in this distribution.
Refer to licensing information at http://www.artifex.com or contact
Artifex Software, Inc., 1305 Grant Avenue - Suite 200, Novato,
CA 94945, U.S.A., +1(415)492-9861, for further information.
*/
/* encapsulates jp2/jpx JPEG2000 images in PDF 1.5 files */
/* based on jpegtopdf by Tor Andersson */
/* compile with 'cc -o jpxtopdf jpxtopdf.c -lm' */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <math.h>
int pages[8000];
int npages = 0;
int xref[8000*3+100];
int nxref = 0;
typedef struct {
char *filename; /* name of image file */
int filesize; /* data length of image file */
int width; /* pixels per line */
int height; /* rows */
int numcmpts; /* number of color components */
int depth; /* bits per color component */
double dpi; /* image resolution in dots per inch */
} imagedata;
#define BUFSIZE 4096
#ifndef MIN
#define MIN(x,y) ((x) < (y) ? (x) : (y))
#endif
enum { FALSE, TRUE };
typedef struct box_s {
unsigned int length; /* box length */
char type[5]; /* box type */
const unsigned char *data; /* pointer to the contained data */
unsigned int size; /* size of the contained data */
void *rez; /* pointer to the parsed result, if any */
struct box_s *next;
} box_t;
typedef struct {
char brand[5];
unsigned int version;
} box_ftyp_t;
typedef struct {
unsigned int width, height;
unsigned int nc; /* number of components */
int bpc; /* bits per component */
int sign; /* whether components are unsigned or signed */
int C; /* compression type */
int UnkC; /* colour space is unknown */
int IPR; /* intellectual property block is present */
} box_ihdr_t;
static unsigned int read_uint32(const unsigned char *p)
{
return (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
}
static unsigned int read_uint16(const unsigned char *p)
{
return (p[0] << 8) | p[1];
}
void box_free(box_t *box)
{
if (box) {
if (box->rez) free(box->rez);
free(box);
}
}
box_t *box_read(const unsigned char *buf, const long size)
{
box_t *box;
if (size < 8) return NULL;
box = malloc(sizeof(*box));
if (box) {
box->length = read_uint32(buf);
memcpy(box->type, buf + 4, 4);
box->type[4] = '\0';
box->data = buf + 8;
box->size = MIN(box->length, size);
box->rez = NULL;
box->next = NULL;
if (!memcmp(box->type, "ftyp", 4)) {
/* File type box */
box_ftyp_t *ftyp = malloc(sizeof(*ftyp));
if (ftyp) {
memcpy(ftyp->brand, box->data, 4);
ftyp->brand[4] = '\0';
ftyp->version = read_uint32(box->data + 4);
}
box->rez = ftyp;
} else if (!memcmp(box->type, "ihdr", 4)) {
/* image header box */
box_ihdr_t *ihdr = malloc(sizeof(*ihdr));
if (ihdr) {
ihdr->height = read_uint32(box->data);
ihdr->width = read_uint32(box->data + 4);
ihdr->nc = read_uint16(box->data + 8);
ihdr->bpc = (box->data[10] & 0x7f) + 1;
ihdr->sign = box->data[10] >> 7;
ihdr->C = box->data[11];
ihdr->UnkC = box->data[12];
ihdr->IPR = box->data[13];
}
box->rez = ihdr;
}
}
return box;
}
#ifdef DEBUG
void box_print(box_t *box)
{
if (box->length)
fprintf(stderr, "box '%s' (%u bytes)", box->type, box->length);
else
fprintf(stderr, "box '%s' EOF", box->type);
if (!memcmp(box->type, "ftyp", 4)) {
/* File type box */
box_ftyp_t *ftyp = box->rez;
if (ftyp)
fprintf(stderr, " brand '%s' version %u",
ftyp->brand, ftyp->version);
else
fprintf(stderr, " no parse result");
} else if (!memcmp(box->type, "ihdr", 4)) {
/* image header box */
box_ihdr_t *ihdr = box->rez;
if (ihdr)
fprintf(stderr, " %ux%u %u component image with %d bit %s samples",
ihdr->width, ihdr->height, ihdr->nc,
ihdr->bpc, ihdr->sign ? "signed" : "unsigned");
else
fprintf(stderr, " no parse result");
}
fprintf(stderr, "\n");
}
#endif /* DEBUG */
/* parse the image header in a jpx file and fill out imagedata struct */
static int jpx_read_imagedata(imagedata * jpx)
{
FILE *in;
unsigned char buf[BUFSIZE];
int n, offset;
int header = FALSE;
/* open the file for reading */
in = fopen(jpx->filename, "rb");
if (in == NULL) {
fprintf(stderr, "Error: could not open input file '%s'\n",
jpx->filename);
return FALSE;
}
n = fread(buf, 1, BUFSIZE, in);
/* check the file signature */
if (n < 12) {
fprintf(stderr, "Error: file too short\n");
return FALSE;
}
if (memcmp(buf, "\x00\x00\x00\x0CjP \x0D\x0A\x87\x0A", 12)) {
fprintf(stderr, "Skipping '%s': not a JPX file\n", jpx->filename);
return FALSE;
}
/* initialize the resultion in case the file doesn't set it */
jpx->dpi = 0.0;
/* parse the file for the image header */
offset = 0;
while (n - offset >= 8) {
box_t *box = box_read(buf + offset, n - offset);
if (box) {
#ifdef DEBUG
box_print(box);
#endif
if (!memcmp(box->type, "jp2h", 4)) {
box->next = box_read(buf + offset + 8, box->size);
if (box->next) {
box_ihdr_t *ihdr = box->next->rez;
#ifdef DEBUG
box_print(box->next);
#endif
jpx->width = ihdr->width;
jpx->height = ihdr->height;
jpx->numcmpts = ihdr->nc;
jpx->depth = ihdr->bpc;
box_free(box->next);
header = TRUE;
}
}
if (box->length <= 0) break;
offset += box->length;
box_free(box);
}
}
if (!header) {
fprintf(stderr, "Skipping '%s': couldn't parse image header\n",
jpx->filename);
return FALSE;
}
fprintf(stderr,
"Note on file '%s': %dx%d pixel, %d color component%s, dpi %lf\n",
jpx->filename, jpx->width, jpx->height,
jpx->numcmpts, (jpx->numcmpts == 1 ? "" : "s"),
jpx->dpi);
if (jpx->dpi == 0.0)
jpx->dpi = 100.0;
return TRUE;
}
static int jpx_pdf(imagedata * jpx, FILE * out)
{
FILE *in;
unsigned char buf[BUFSIZE];
int n;
double scale;
if ( !jpx_read_imagedata(jpx) ) return -1;
in = fopen(jpx->filename, "rb");
if (in == NULL) {
fprintf(stderr, "Error: unable to open input file '%s'\n", jpx->filename);
return -1;
}
fseek(in, 0, SEEK_END);
jpx->filesize = ftell(in);
fseek(in, 0, SEEK_SET);
xref[nxref++] = ftell(out);
fprintf(out, "%d 0 obj\n", nxref);
fprintf(out, "<</Type/XObject/Subtype/Image\n");
fprintf(out, "/Width %d /Height %d\n", jpx->width, jpx->height);
fprintf(out, "/ColorSpace/%s\n", jpx->numcmpts == 1 ? "DeviceGray" : "DeviceRGB");
fprintf(out, "/BitsPerComponent %d\n", jpx->depth);
fprintf(out, "/Length %d\n", jpx->filesize);
fprintf(out, "/Filter/JPXDecode\n");
fprintf(out, ">>\n");
fprintf(out, "stream\n");
/* copy data from jpx file */
while ((n = fread(buf, 1, sizeof(buf), in)) != 0)
fwrite(buf, 1, n, out);
fprintf(out, "endstream\n");
fprintf(out, "endobj\n");
fprintf(out, "\n");
fclose(in);
scale = 72.0 / jpx->dpi;
sprintf((char *)buf, "%d 0 0 %d 0 0 cm /x%d Do\n",
(int)ceil(jpx->width * scale),
(int)ceil(jpx->height * scale),
nxref);
xref[nxref++] = ftell(out);
fprintf(out, "%d 0 obj\n<</Length %lu>>\n",
nxref, (unsigned long)strlen((char*)buf));
fprintf(out, "stream\n");
fprintf(out, "%s", buf);
fprintf(out, "endstream\n");
fprintf(out, "endobj\n");
fprintf(out, "\n");
xref[nxref++] = ftell(out);
fprintf(out, "%d 0 obj\n", nxref);
fprintf(out, "<</Type/Page/Parent 3 0 R\n");
fprintf(out, "/Resources << /XObject << /x%d %d 0 R >> >>\n", nxref-2, nxref-2);
fprintf(out, "/MediaBox [0 0 %d %d]\n",
(int)ceil(jpx->width * scale),
(int)ceil(jpx->height * scale));
fprintf(out, "/Contents %d 0 R\n", nxref-1);
fprintf(out, ">>\n");
fprintf(out, "endobj\n");
fprintf(out, "\n");
return nxref;
}
int main(int argc, char **argv)
{
imagedata image;
FILE *outfile;
int i;
int startxref;
image.filename = NULL;
outfile = fopen("out.pdf", "w");
fprintf(outfile, "%%PDF-1.5\n\n");
xref[nxref++] = ftell(outfile);
fprintf(outfile, "1 0 obj\n");
fprintf(outfile, "<</Type/Catalog/Pages 3 0 R>>\n");
fprintf(outfile, "endobj\n\n");
xref[nxref++] = ftell(outfile);
fprintf(outfile, "2 0 obj\n");
fprintf(outfile, "<</Creator(jpxtopdf)/Title(%s)>>\n", getenv("TITLE"));
fprintf(outfile, "endobj\n\n");
/* delay obj #3 (pages) until later */
nxref++;
for (i = 1; i < argc; i++) {
image.filename = argv[i];
/* copy the jpx stream wrapped in a pdf object */
pages[npages++] = jpx_pdf(&image, outfile);
}
xref[2] = ftell(outfile);
fprintf(outfile, "3 0 obj\n");
fprintf(outfile, "<</Type/Pages/Count %d/Kids[\n", npages);
for (i = 0; i < npages; i++)
fprintf(outfile, "%d 0 R\n", pages[i]);
fprintf(outfile, "]>>\nendobj\n\n");
startxref = ftell(outfile);
fprintf(outfile, "xref\n0 %d\n", nxref + 1);
fprintf(outfile, "0000000000 65535 f \n");
for (i = 0; i < nxref; i++)
fprintf(outfile, "%010d 00000 n \n", xref[i]);
fprintf(outfile, "trailer\n<< /Size %d /Root 1 0 R /Info 2 0 R >>\n", nxref + 1);
fprintf(outfile, "startxref\n%d\n%%%%EOF\n", startxref);
fclose(outfile);
return 0;
}
|