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162 lines
5.3 KiB
Plaintext
162 lines
5.3 KiB
Plaintext
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#------------------------------------------------------------------------------
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# $File: jpeg,v 1.16 2011/01/04 19:29:32 rrt Exp $
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# JPEG images
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# SunOS 5.5.1 had
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#
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# 0 string \377\330\377\340 JPEG file
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# 0 string \377\330\377\356 JPG file
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#
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# both of which turn into "JPEG image data" here.
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#
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0 beshort 0xffd8 JPEG image data
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!:mime image/jpeg
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!:apple 8BIMJPEG
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!:strength +1
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>6 string JFIF \b, JFIF standard
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# The following added by Erik Rossen <rossen@freesurf.ch> 1999-09-06
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# in a vain attempt to add image size reporting for JFIF. Note that these
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# tests are not fool-proof since some perfectly valid JPEGs are currently
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# impossible to specify in magic(4) format.
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# First, a little JFIF version info:
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>>11 byte x \b %d.
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>>12 byte x \b%02d
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# Next, the resolution or aspect ratio of the image:
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#>>13 byte 0 \b, aspect ratio
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#>>13 byte 1 \b, resolution (DPI)
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#>>13 byte 2 \b, resolution (DPCM)
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#>>4 beshort x \b, segment length %d
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# Next, show thumbnail info, if it exists:
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>>18 byte !0 \b, thumbnail %dx
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>>>19 byte x \b%d
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# EXIF moved down here to avoid reporting a bogus version number,
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# and EXIF version number printing added.
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# - Patrik R=E5dman <patrik+file-magic@iki.fi>
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>6 string Exif \b, EXIF standard
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# Look for EXIF IFD offset in IFD 0, and then look for EXIF version tag in EXIF IFD.
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# All possible combinations of entries have to be enumerated, since no looping
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# is possible. And both endians are possible...
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# The combinations included below are from real-world JPEGs.
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# Little-endian
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>>12 string II
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# IFD 0 Entry #5:
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>>>70 leshort 0x8769
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# EXIF IFD Entry #1:
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>>>>(78.l+14) leshort 0x9000
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>>>>>(78.l+23) byte x %c
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>>>>>(78.l+24) byte x \b.%c
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>>>>>(78.l+25) byte !0x30 \b%c
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# IFD 0 Entry #9:
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>>>118 leshort 0x8769
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# EXIF IFD Entry #3:
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>>>>(126.l+38) leshort 0x9000
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>>>>>(126.l+47) byte x %c
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>>>>>(126.l+48) byte x \b.%c
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>>>>>(126.l+49) byte !0x30 \b%c
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# IFD 0 Entry #10
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>>>130 leshort 0x8769
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# EXIF IFD Entry #3:
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>>>>(138.l+38) leshort 0x9000
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>>>>>(138.l+47) byte x %c
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>>>>>(138.l+48) byte x \b.%c
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>>>>>(138.l+49) byte !0x30 \b%c
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# EXIF IFD Entry #4:
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>>>>(138.l+50) leshort 0x9000
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>>>>>(138.l+59) byte x %c
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>>>>>(138.l+60) byte x \b.%c
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>>>>>(138.l+61) byte !0x30 \b%c
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# EXIF IFD Entry #5:
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>>>>(138.l+62) leshort 0x9000
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>>>>>(138.l+71) byte x %c
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>>>>>(138.l+72) byte x \b.%c
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>>>>>(138.l+73) byte !0x30 \b%c
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# IFD 0 Entry #11
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>>>142 leshort 0x8769
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# EXIF IFD Entry #3:
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>>>>(150.l+38) leshort 0x9000
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>>>>>(150.l+47) byte x %c
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>>>>>(150.l+48) byte x \b.%c
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>>>>>(150.l+49) byte !0x30 \b%c
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# EXIF IFD Entry #4:
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>>>>(150.l+50) leshort 0x9000
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>>>>>(150.l+59) byte x %c
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>>>>>(150.l+60) byte x \b.%c
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>>>>>(150.l+61) byte !0x30 \b%c
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# EXIF IFD Entry #5:
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>>>>(150.l+62) leshort 0x9000
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>>>>>(150.l+71) byte x %c
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>>>>>(150.l+72) byte x \b.%c
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>>>>>(150.l+73) byte !0x30 \b%c
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# Big-endian
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>>12 string MM
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# IFD 0 Entry #9:
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>>>118 beshort 0x8769
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# EXIF IFD Entry #1:
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>>>>(126.L+14) beshort 0x9000
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>>>>>(126.L+23) byte x %c
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>>>>>(126.L+24) byte x \b.%c
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>>>>>(126.L+25) byte !0x30 \b%c
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# EXIF IFD Entry #3:
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>>>>(126.L+38) beshort 0x9000
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>>>>>(126.L+47) byte x %c
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>>>>>(126.L+48) byte x \b.%c
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>>>>>(126.L+49) byte !0x30 \b%c
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# IFD 0 Entry #10
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>>>130 beshort 0x8769
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# EXIF IFD Entry #3:
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>>>>(138.L+38) beshort 0x9000
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>>>>>(138.L+47) byte x %c
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>>>>>(138.L+48) byte x \b.%c
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>>>>>(138.L+49) byte !0x30 \b%c
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# EXIF IFD Entry #5:
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>>>>(138.L+62) beshort 0x9000
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>>>>>(138.L+71) byte x %c
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>>>>>(138.L+72) byte x \b.%c
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>>>>>(138.L+73) byte !0x30 \b%c
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# IFD 0 Entry #11
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>>>142 beshort 0x8769
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# EXIF IFD Entry #4:
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>>>>(150.L+50) beshort 0x9000
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>>>>>(150.L+59) byte x %c
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>>>>>(150.L+60) byte x \b.%c
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>>>>>(150.L+61) byte !0x30 \b%c
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# Here things get sticky. We can do ONE MORE marker segment with
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# indirect addressing, and that's all. It would be great if we could
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# do pointer arithemetic like in an assembler language. Christos?
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# And if there was some sort of looping construct to do searches, plus a few
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# named accumulators, it would be even more effective...
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# At least we can show a comment if no other segments got inserted before:
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>(4.S+5) byte 0xFE \b, comment:
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>>(4.S+6) pstring/HJ x "%s"
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# Or, we can show the encoding type (I've included only the three most common)
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# and image dimensions if we are lucky and the SOFn (image segment) is here:
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>(4.S+5) byte 0xC0 \b, baseline
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>>(4.S+6) byte x \b, precision %d
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>>(4.S+7) beshort x \b, %dx
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>>(4.S+9) beshort x \b%d
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>(4.S+5) byte 0xC1 \b, extended sequential
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>>(4.S+6) byte x \b, precision %d
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>>(4.S+7) beshort x \b, %dx
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>>(4.S+9) beshort x \b%d
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>(4.S+5) byte 0xC2 \b, progressive
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>>(4.S+6) byte x \b, precision %d
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>>(4.S+7) beshort x \b, %dx
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>>(4.S+9) beshort x \b%d
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# I've commented-out quantisation table reporting. I doubt anyone cares yet.
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#>(4.S+5) byte 0xDB \b, quantisation table
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#>>(4.S+6) beshort x \b length=%d
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#>14 beshort x \b, %d x
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#>16 beshort x \b %d
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# HSI is Handmade Software's proprietary JPEG encoding scheme
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0 string hsi1 JPEG image data, HSI proprietary
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# From: David Santinoli <david@santinoli.com>
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0 string \x00\x00\x00\x0C\x6A\x50\x20\x20\x0D\x0A\x87\x0A JPEG 2000 image data
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# Type: JPEG 2000 codesream
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# From: Mathieu Malaterre <mathieu.malaterre@gmail.com>
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0 belong 0xff4fff51 JPEG 2000 codestream
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45 beshort 0xff52
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