1b6cee71dSXin LI 2b6cee71dSXin LI#------------------------------------------------------------------------------ 3*43a5ec4eSXin LI# $File: jpeg,v 1.36 2021/08/28 12:30:52 christos Exp $ 4b6cee71dSXin LI# JPEG images 5b6cee71dSXin LI# SunOS 5.5.1 had 6b6cee71dSXin LI# 7b6cee71dSXin LI# 0 string \377\330\377\340 JPEG file 8b6cee71dSXin LI# 0 string \377\330\377\356 JPG file 9b6cee71dSXin LI# 10b6cee71dSXin LI# both of which turn into "JPEG image data" here. 11b6cee71dSXin LI# 12*43a5ec4eSXin LI0 belong 0xffd8fff7 JPEG-LS image data 13*43a5ec4eSXin LI!:mime image/jls 14*43a5ec4eSXin LI!:ext jls 15*43a5ec4eSXin LI>0 use jpeg 16*43a5ec4eSXin LI 17*43a5ec4eSXin LI0 belong&0xffffff00 0xffd8ff00 JPEG image data 18b6cee71dSXin LI!:mime image/jpeg 19b6cee71dSXin LI!:apple 8BIMJPEG 205f0216bdSXin LI!:strength *3 215f0216bdSXin LI!:ext jpeg/jpg/jpe/jfif 22*43a5ec4eSXin LI>0 use jpeg 23*43a5ec4eSXin LI 24*43a5ec4eSXin LI0 name jpeg 25b6cee71dSXin LI>6 string JFIF \b, JFIF standard 26b6cee71dSXin LI# The following added by Erik Rossen <rossen@freesurf.ch> 1999-09-06 27b6cee71dSXin LI# in a vain attempt to add image size reporting for JFIF. Note that these 28b6cee71dSXin LI# tests are not fool-proof since some perfectly valid JPEGs are currently 29b6cee71dSXin LI# impossible to specify in magic(4) format. 30b6cee71dSXin LI# First, a little JFIF version info: 31b6cee71dSXin LI>>11 byte x \b %d. 32b6cee71dSXin LI>>12 byte x \b%02d 33b6cee71dSXin LI# Next, the resolution or aspect ratio of the image: 34c2931133SXin LI>>13 byte 0 \b, aspect ratio 35c2931133SXin LI>>13 byte 1 \b, resolution (DPI) 36c2931133SXin LI>>13 byte 2 \b, resolution (DPCM) 37c2931133SXin LI>>14 beshort x \b, density %dx 38c2931133SXin LI>>16 beshort x \b%d 39c2931133SXin LI>>4 beshort x \b, segment length %d 40b6cee71dSXin LI# Next, show thumbnail info, if it exists: 41b6cee71dSXin LI>>18 byte !0 \b, thumbnail %dx 42b6cee71dSXin LI>>>19 byte x \b%d 434460e5b0SXin LI>6 string Exif \b, Exif standard: [ 444460e5b0SXin LI>>12 indirect/r x 454460e5b0SXin LI>>12 string x \b] 46c2931133SXin LI 47c2931133SXin LI# Jump to the first segment 48c2931133SXin LI>(4.S+4) use jpeg_segment 49c2931133SXin LI 50c2931133SXin LI# This uses recursion... 51c2931133SXin LI0 name jpeg_segment 52c2931133SXin LI>0 beshort 0xFFFE 535f0216bdSXin LI# Recursion handled by FFE0 545f0216bdSXin LI#>>(2.S+2) use jpeg_segment 55c2931133SXin LI>>2 pstring/HJ x \b, comment: "%s" 56c2931133SXin LI 57c2931133SXin LI>0 beshort 0xFFC0 58c2931133SXin LI>>(2.S+2) use jpeg_segment 59c2931133SXin LI>>4 byte x \b, baseline, precision %d 60c2931133SXin LI>>7 beshort x \b, %dx 61c2931133SXin LI>>5 beshort x \b%d 6248c779cdSXin LI>>9 byte x \b, components %d 63c2931133SXin LI 64c2931133SXin LI>0 beshort 0xFFC1 65c2931133SXin LI>>(2.S+2) use jpeg_segment 66c2931133SXin LI>>4 byte x \b, extended sequential, precision %d 67c2931133SXin LI>>7 beshort x \b, %dx 68c2931133SXin LI>>5 beshort x \b%d 6948c779cdSXin LI>>9 byte x \b, components %d 70c2931133SXin LI 71c2931133SXin LI>0 beshort 0xFFC2 72c2931133SXin LI>>(2.S+2) use jpeg_segment 73c2931133SXin LI>>4 byte x \b, progressive, precision %d 74c2931133SXin LI>>7 beshort x \b, %dx 75c2931133SXin LI>>5 beshort x \b%d 7648c779cdSXin LI>>9 byte x \b, components %d 77c2931133SXin LI 78c2931133SXin LI# Define Huffman Tables 79c2931133SXin LI>0 beshort 0xFFC4 80c2931133SXin LI>>(2.S+2) use jpeg_segment 81c2931133SXin LI 824460e5b0SXin LI>0 beshort 0xFFE1 835f0216bdSXin LI# Recursion handled by FFE0 844460e5b0SXin LI#>>(2.S+2) use jpeg_segment 854460e5b0SXin LI>>4 string Exif \b, Exif Standard: [ 864460e5b0SXin LI>>>10 indirect/r x 874460e5b0SXin LI>>>10 string x \b] 884460e5b0SXin LI 89c2931133SXin LI# Application specific markers 90c2931133SXin LI>0 beshort&0xFFE0 =0xFFE0 91c2931133SXin LI>>(2.S+2) use jpeg_segment 92c2931133SXin LI 93c2931133SXin LI# DB: Define Quantization tables 94c2931133SXin LI# DD: Define Restart interval [XXX: wrong here, it is 4 bytes] 95c2931133SXin LI# D8: Start of image 96c2931133SXin LI# D9: End of image 97c2931133SXin LI# Dn: Restart 98c2931133SXin LI>0 beshort&0xFFD0 =0xFFD0 995f0216bdSXin LI>>0 beshort&0xFFE0 !0xFFE0 1005f0216bdSXin LI>>>(2.S+2) use jpeg_segment 101b6cee71dSXin LI 102*43a5ec4eSXin LI#>0 beshort x unknown %#x 1034460e5b0SXin LI#>>(2.S+2) use jpeg_segment 1044460e5b0SXin LI 105b6cee71dSXin LI# HSI is Handmade Software's proprietary JPEG encoding scheme 106b6cee71dSXin LI0 string hsi1 JPEG image data, HSI proprietary 107b6cee71dSXin LI 108b6cee71dSXin LI# From: David Santinoli <david@santinoli.com> 109b6cee71dSXin LI0 string \x00\x00\x00\x0C\x6A\x50\x20\x20\x0D\x0A\x87\x0A JPEG 2000 110b6cee71dSXin LI# From: Johan van der Knijff <johan.vanderknijff@kb.nl> 111b6cee71dSXin LI# Added sub-entries for JP2, JPX, JPM and MJ2 formats; added mimetypes 112b6cee71dSXin LI# https://github.com/bitsgalore/jp2kMagic 113b6cee71dSXin LI# 114b6cee71dSXin LI# Now read value of 'Brand' field, which yields a few possibilities: 115b6cee71dSXin LI>20 string \x6a\x70\x32\x20 Part 1 (JP2) 116b6cee71dSXin LI!:mime image/jp2 117b6cee71dSXin LI>20 string \x6a\x70\x78\x20 Part 2 (JPX) 118b6cee71dSXin LI!:mime image/jpx 119b6cee71dSXin LI>20 string \x6a\x70\x6d\x20 Part 6 (JPM) 120b6cee71dSXin LI!:mime image/jpm 121b6cee71dSXin LI>20 string \x6d\x6a\x70\x32 Part 3 (MJ2) 122b6cee71dSXin LI!:mime video/mj2 123b6cee71dSXin LI 124b6cee71dSXin LI# Type: JPEG 2000 codesream 125b6cee71dSXin LI# From: Mathieu Malaterre <mathieu.malaterre@gmail.com> 126b6cee71dSXin LI0 belong 0xff4fff51 JPEG 2000 codestream 127b6cee71dSXin LI45 beshort 0xff52 128a5d223e6SXin LI 129a5d223e6SXin LI# JPEG extended range 130a5d223e6SXin LI0 string \x49\x49\xbc 131a5d223e6SXin LI>3 byte 1 132a5d223e6SXin LI>>4 lelong%2 0 JPEG-XR 133a5d223e6SXin LI!:mime image/jxr 134a5d223e6SXin LI!:ext jxr 135*43a5ec4eSXin LI 136*43a5ec4eSXin LI# JPEG XL 137*43a5ec4eSXin LI# From: Ian Tester 138*43a5ec4eSXin LI0 string \xff\x0a JPEG XL codestream 139*43a5ec4eSXin LI!:mime image/jxl 140*43a5ec4eSXin LI!:ext jxl 141*43a5ec4eSXin LI 142*43a5ec4eSXin LI# JPEG XL (transcoded JPEG file) 143*43a5ec4eSXin LI0 string \x00\x00\x00\x0cJXL\x20\x0d\x0a\x87\x0a JPEG XL container 144*43a5ec4eSXin LI!:mime image/jxl 145*43a5ec4eSXin LI!:ext jxl 146