よやさんのswfedに含まれるjpeg_segmentをDQT/DHTをダンプするように改造

gistfile1.sh

cc -Wall -D__JPEG_SEGMENT_DEBUG__ -o jpeg_segment jpeg_segment.c bitstream.c
./jpeg_segment unlock_001.jpg

jpeg_segment.c.diff

--- jpeg_segment.c.orig
+++ jpeg_segment.c
@@ -238,6 +238,14 @@
             printf("(%d) marker=%s(FF%02X): length=%lu\n",
                    i, marker_name?marker_name:"Unknown",
                    node->marker, node->data_len);
+            if (node->marker == 0xDB || node->marker == 0xC4) { // DQT or DHT
+                const unsigned char *data_cur = node->data_ref;
+                const unsigned char *data_end = node->data_ref + node->data_len;
+                while (data_cur < data_end) {
+                    printf("%02x ", *data_cur++);
+                }
+                printf("\n");
+            }
         }
         node = node->next;
     }

unlock_001.txt

(0) marker=SOI(FFD8): length=0
(1) marker=APP0(FFE0): length=14
(2) marker=DQT(FFDB): length=65
00 (Pq1=0, Tq1=0)
04 03 03 03 03 03 04 03 03 04 06 04 03 04 06 07
05 04 04 05 07 08 06 06 07 06 06 08 0a 08 09 09
09 09 08 0a 0a 0c 0c 0c 0c 0c 0a 0c 0c 0d 0d 0c
0c 11 11 11 11 11 14 14 14 14 14 14 14 14 14 14
(3) marker=DQT(FFDB): length=65
01 (Pq1=0, Tq1=1)
04 05 05 08 07 08 0f 0a 0a 0f 14 0e 0e 0e 14 14
14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14
14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14
14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14
(4) marker=SOF2(FFC2): length=15
(5) marker=DHT(FFC4): length=27
00 (Tc1=0, Th1=0)
00 00 07 01 01 01 00 00 00 00 00 00 00 00 00 00
00 01 02 04 05 06 07 03 08 09
(6) marker=SOS(FFDA): length=37586
(7) marker=DHT(FFC4): length=27
01 (Tc1=0, Th1=1)
00 02 02 03 01 01 01 00 00 00 00 00 00 00 00 00
00 01 02 03 04 05 06 07 08 09
(8) marker=SOS(FFDA): length=25178
(9) marker=DHT(FFC4): length=26
01 (Tc1=0, Th1=1)
00 02 03 01 01 01 01 00 00 00 00 00 00 00 00 00
00 01 02 03 04 05 06 07 08
(10) marker=SOS(FFDA): length=25039
(11) marker=DHT(FFC4): length=61
10 (Tc1=1, Th1=0)
00 01 04 02 02 01 02 04 05 04 02 02 01 03 00 0b
02 00 01 03 04 05 11 12 13 14 06 21 10 15 22 31
16 20 23 32 34 24 33 35 41 25 30 42 51 40 07 52
61 17 43 50 26 36 44 60 45 62 71 53
(12) marker=SOS(FFDA): length=121575
(13) marker=DHT(FFC4): length=80
10 (Tc1=1, Th1=0)
00 01 03 01 04 05 08 07 05 06 05 02 05 04 00 07
01 00 02 03 11 04 12 21 31 10 13 22 41 51 20 32
52 61 71 91 92 b1 14 23 42 81 a1 c1 d1 05 30 33
53 62 24 40 72 a2 b2 e1 34 43 82 93 f0 50 e2 15
54 63 c2 d2 73 a3 b3 f1 60 83 25 44 74 70 35
(14) marker=SOS(FFDA): length=123551
(15) marker=DHT(FFC4): length=40
10 (Tc1=1, Th1=0)
01 00 02 01 03 03 03 05 01 01 01 01 01 00 00 00
01 00 11 21 31 41 51 10 61 71 81 91 f0 a1 b1 c1
d1 f1 20 e1 30 40 50
(16) marker=SOS(FFDA): length=137738
(17) marker=DHT(FFC4): length=39
10 (Tc1=1, Th1=0)
01 00 02 02 02 01 03 04 03 01 01 01 01 00 00 00
01 00 11 21 31 41 51 61 71 81 91 10 a1 c1 f0 b1
d1 f1 e1 20 30 40
(18) marker=SOS(FFDA): length=190266
(19) marker=DHT(FFC4): length=38
11 (Tc1=1, Th1=1)
00 01 03 04 02 03 01 01 00 03 01 01 01 00 00 00
01 02 03 11 00 04 05 12 10 13 06 14 20 15 30 07
16 40 50 60 17
(20) marker=SOS(FFDA): length=32347
(21) marker=DHT(FFC4): length=75
11 (Tc1=1, Th1=1)
00 01 03 01 06 03 04 07 05 06 04 05 03 04 01 05
01 00 02 11 03 04 10 12 21 31 51 20 22 41 13 30
61 71 05 23 32 52 81 91 b1 14 40 42 72 a1 24 50
53 c1 d1 f0 33 62 92 e1 06 25 43 60 82 15 70 f1
54 a2 b2 d2 80 55 63 90 93 e2
(22) marker=SOS(FFDA): length=54999
(23) marker=DHT(FFC4): length=38
11 (Tc1=1, Th1=1)
00 01 03 04 02 03 01 01 01 01 01 01 01 01 00 00
01 02 03 11 00 04 05 12 10 13 06 14 20 15 30 40
16 07 50 17 60
(24) marker=SOS(FFDA): length=32195
(25) marker=DHT(FFC4): length=72
11 (Tc1=1, Th1=1)
00 02 01 02 03 06 02 07 04 09 01 07 04 02 02 03
00 01 02 03 11 10 12 21 04 20 22 31 41 51 61 71
13 23 30 32 52 81 91 05 40 a1 b1 14 24 42 50 53
62 72 c1 f0 92 06 33 43 60 82 d1 e1 25 a2 b2 f1
15 63 44 54 70 34 80
(26) marker=SOS(FFDA): length=50789
(27) marker=EOI(FFD9): length=0