127 lines
3.4 KiB
Plaintext
127 lines
3.4 KiB
Plaintext
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#------------------------------------------------------------------------------
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# $File: jpeg,v 1.32 2018/10/01 18:58:29 christos 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 *3
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!:ext jpeg/jpg/jpe/jfif
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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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>>14 beshort x \b, density %dx
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>>16 beshort x \b%d
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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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>6 string Exif \b, Exif standard: [
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>>12 indirect/r x
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>>12 string x \b]
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# Jump to the first segment
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>(4.S+4) use jpeg_segment
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# This uses recursion...
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0 name jpeg_segment
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>0 beshort 0xFFFE
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# Recursion handled by FFE0
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#>>(2.S+2) use jpeg_segment
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>>2 pstring/HJ x \b, comment: "%s"
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>0 beshort 0xFFC0
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>>(2.S+2) use jpeg_segment
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>>4 byte x \b, baseline, precision %d
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>>7 beshort x \b, %dx
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>>5 beshort x \b%d
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>>9 byte x \b, components %d
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>0 beshort 0xFFC1
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>>(2.S+2) use jpeg_segment
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>>4 byte x \b, extended sequential, precision %d
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>>7 beshort x \b, %dx
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>>5 beshort x \b%d
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>>9 byte x \b, components %d
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>0 beshort 0xFFC2
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>>(2.S+2) use jpeg_segment
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>>4 byte x \b, progressive, precision %d
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>>7 beshort x \b, %dx
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>>5 beshort x \b%d
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>>9 byte x \b, components %d
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# Define Huffman Tables
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>0 beshort 0xFFC4
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>>(2.S+2) use jpeg_segment
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>0 beshort 0xFFE1
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# Recursion handled by FFE0
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#>>(2.S+2) use jpeg_segment
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>>4 string Exif \b, Exif Standard: [
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>>>10 indirect/r x
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>>>10 string x \b]
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# Application specific markers
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>0 beshort&0xFFE0 =0xFFE0
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>>(2.S+2) use jpeg_segment
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# DB: Define Quantization tables
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# DD: Define Restart interval [XXX: wrong here, it is 4 bytes]
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# D8: Start of image
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# D9: End of image
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# Dn: Restart
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>0 beshort&0xFFD0 =0xFFD0
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>>0 beshort&0xFFE0 !0xFFE0
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>>>(2.S+2) use jpeg_segment
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#>0 beshort x unknown 0x%x
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#>>(2.S+2) use jpeg_segment
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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
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# From: Johan van der Knijff <johan.vanderknijff@kb.nl>
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# Added sub-entries for JP2, JPX, JPM and MJ2 formats; added mimetypes
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# https://github.com/bitsgalore/jp2kMagic
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#
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# Now read value of 'Brand' field, which yields a few possibilities:
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>20 string \x6a\x70\x32\x20 Part 1 (JP2)
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!:mime image/jp2
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>20 string \x6a\x70\x78\x20 Part 2 (JPX)
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!:mime image/jpx
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>20 string \x6a\x70\x6d\x20 Part 6 (JPM)
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!:mime image/jpm
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>20 string \x6d\x6a\x70\x32 Part 3 (MJ2)
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!:mime video/mj2
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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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# JPEG extended range
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0 string \x49\x49\xbc
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>3 byte 1
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>>4 lelong%2 0 JPEG-XR
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!:mime image/jxr
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!:ext jxr
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