2 #------------------------------------------------------------------------------
6 # 0 string \377\330\377\340 JPEG file
7 # 0 string \377\330\377\356 JPG file
9 # both of which turn into "JPEG image data" here.
11 0 beshort 0xffd8 JPEG image data
14 >6 string JFIF \b, JFIF standard
15 # The following added by Erik Rossen <rossen@freesurf.ch> 1999-09-06
16 # in a vain attempt to add image size reporting for JFIF. Note that these
17 # tests are not fool-proof since some perfectly valid JPEGs are currently
18 # impossible to specify in magic(4) format.
19 # First, a little JFIF version info:
22 # Next, the resolution or aspect ratio of the image:
23 #>>13 byte 0 \b, aspect ratio
24 #>>13 byte 1 \b, resolution (DPI)
25 #>>13 byte 2 \b, resolution (DPCM)
26 #>>4 beshort x \b, segment length %d
27 # Next, show thumbnail info, if it exists:
28 >>18 byte !0 \b, thumbnail %dx
31 # EXIF moved down here to avoid reporting a bogus version number,
32 # and EXIF version number printing added.
33 # - Patrik R=E5dman <patrik+file-magic@iki.fi>
34 >6 string Exif \b, EXIF standard
35 # Look for EXIF IFD offset in IFD 0, and then look for EXIF version tag in EXIF IFD.
36 # All possible combinations of entries have to be enumerated, since no looping
37 # is possible. And both endians are possible...
38 # The combinations included below are from real-world JPEGs.
44 >>>>(78.l+14) leshort 0x9000
45 >>>>>(78.l+23) byte x %c
46 >>>>>(78.l+24) byte x \b.%c
47 >>>>>(78.l+25) byte !0x30 \b%c
51 >>>>(126.l+38) leshort 0x9000
52 >>>>>(126.l+47) byte x %c
53 >>>>>(126.l+48) byte x \b.%c
54 >>>>>(126.l+49) byte !0x30 \b%c
58 >>>>(138.l+38) leshort 0x9000
59 >>>>>(138.l+47) byte x %c
60 >>>>>(138.l+48) byte x \b.%c
61 >>>>>(138.l+49) byte !0x30 \b%c
63 >>>>(138.l+50) leshort 0x9000
64 >>>>>(138.l+59) byte x %c
65 >>>>>(138.l+60) byte x \b.%c
66 >>>>>(138.l+61) byte !0x30 \b%c
68 >>>>(138.l+62) leshort 0x9000
69 >>>>>(138.l+71) byte x %c
70 >>>>>(138.l+72) byte x \b.%c
71 >>>>>(138.l+73) byte !0x30 \b%c
75 >>>>(150.l+38) leshort 0x9000
76 >>>>>(150.l+47) byte x %c
77 >>>>>(150.l+48) byte x \b.%c
78 >>>>>(150.l+49) byte !0x30 \b%c
80 >>>>(150.l+50) leshort 0x9000
81 >>>>>(150.l+59) byte x %c
82 >>>>>(150.l+60) byte x \b.%c
83 >>>>>(150.l+61) byte !0x30 \b%c
85 >>>>(150.l+62) leshort 0x9000
86 >>>>>(150.l+71) byte x %c
87 >>>>>(150.l+72) byte x \b.%c
88 >>>>>(150.l+73) byte !0x30 \b%c
94 >>>>(126.L+14) beshort 0x9000
95 >>>>>(126.L+23) byte x %c
96 >>>>>(126.L+24) byte x \b.%c
97 >>>>>(126.L+25) byte !0x30 \b%c
99 >>>>(126.L+38) beshort 0x9000
100 >>>>>(126.L+47) byte x %c
101 >>>>>(126.L+48) byte x \b.%c
102 >>>>>(126.L+49) byte !0x30 \b%c
104 >>>130 beshort 0x8769
106 >>>>(138.L+38) beshort 0x9000
107 >>>>>(138.L+47) byte x %c
108 >>>>>(138.L+48) byte x \b.%c
109 >>>>>(138.L+49) byte !0x30 \b%c
111 >>>>(138.L+62) beshort 0x9000
112 >>>>>(138.L+71) byte x %c
113 >>>>>(138.L+72) byte x \b.%c
114 >>>>>(138.L+73) byte !0x30 \b%c
116 >>>142 beshort 0x8769
118 >>>>(150.L+50) beshort 0x9000
119 >>>>>(150.L+59) byte x %c
120 >>>>>(150.L+60) byte x \b.%c
121 >>>>>(150.L+61) byte !0x30 \b%c
122 # Here things get sticky. We can do ONE MORE marker segment with
123 # indirect addressing, and that's all. It would be great if we could
124 # do pointer arithemetic like in an assembler language. Christos?
125 # And if there was some sort of looping construct to do searches, plus a few
126 # named accumulators, it would be even more effective...
127 # At least we can show a comment if no other segments got inserted before:
129 >>(4.S+8) string >\0 \b, comment: "%s"
130 # FIXME: When we can do non-byte counted strings, we can use that to get
131 # the string's count, and fix Debian bug #283760
132 #>(4.S+5) byte 0xFE \b, comment
133 #>>(4.S+6) beshort x \b length=%d
134 #>>(4.S+8) string >\0 \b, "%s"
135 # Or, we can show the encoding type (I've included only the three most common)
136 # and image dimensions if we are lucky and the SOFn (image segment) is here:
137 >(4.S+5) byte 0xC0 \b, baseline
138 >>(4.S+6) byte x \b, precision %d
139 >>(4.S+7) beshort x \b, %dx
140 >>(4.S+9) beshort x \b%d
141 >(4.S+5) byte 0xC1 \b, extended sequential
142 >>(4.S+6) byte x \b, precision %d
143 >>(4.S+7) beshort x \b, %dx
144 >>(4.S+9) beshort x \b%d
145 >(4.S+5) byte 0xC2 \b, progressive
146 >>(4.S+6) byte x \b, precision %d
147 >>(4.S+7) beshort x \b, %dx
148 >>(4.S+9) beshort x \b%d
149 # I've commented-out quantisation table reporting. I doubt anyone cares yet.
150 #>(4.S+5) byte 0xDB \b, quantisation table
151 #>>(4.S+6) beshort x \b length=%d
152 #>14 beshort x \b, %d x
155 # HSI is Handmade Software's proprietary JPEG encoding scheme
156 0 string hsi1 JPEG image data, HSI proprietary
158 # From: David Santinoli <david@santinoli.com>
159 0 string \x00\x00\x00\x0C\x6A\x50\x20\x20\x0D\x0A\x87\x0A JPEG 2000 image data
161 # Type: JPEG 2000 codesream
162 # From: Mathieu Malaterre <mathieu.malaterre@gmail.com>
163 0 belong 0xff4fff51 JPEG 2000 codestream