1 2#------------------------------------------------------------------------------ 3# $File: jpeg,v 1.36 2021/08/28 12:30:52 christos Exp $ 4# JPEG images 5# SunOS 5.5.1 had 6# 7# 0 string \377\330\377\340 JPEG file 8# 0 string \377\330\377\356 JPG file 9# 10# both of which turn into "JPEG image data" here. 11# 120 belong 0xffd8fff7 JPEG-LS image data 13!:mime image/jls 14!:ext jls 15>0 use jpeg 16 170 belong&0xffffff00 0xffd8ff00 JPEG image data 18!:mime image/jpeg 19!:apple 8BIMJPEG 20!:strength *3 21!:ext jpeg/jpg/jpe/jfif 22>0 use jpeg 23 240 name jpeg 25>6 string JFIF \b, JFIF standard 26# The following added by Erik Rossen <rossen@freesurf.ch> 1999-09-06 27# in a vain attempt to add image size reporting for JFIF. Note that these 28# tests are not fool-proof since some perfectly valid JPEGs are currently 29# impossible to specify in magic(4) format. 30# First, a little JFIF version info: 31>>11 byte x \b %d. 32>>12 byte x \b%02d 33# Next, the resolution or aspect ratio of the image: 34>>13 byte 0 \b, aspect ratio 35>>13 byte 1 \b, resolution (DPI) 36>>13 byte 2 \b, resolution (DPCM) 37>>14 beshort x \b, density %dx 38>>16 beshort x \b%d 39>>4 beshort x \b, segment length %d 40# Next, show thumbnail info, if it exists: 41>>18 byte !0 \b, thumbnail %dx 42>>>19 byte x \b%d 43>6 string Exif \b, Exif standard: [ 44>>12 indirect/r x 45>>12 string x \b] 46 47# Jump to the first segment 48>(4.S+4) use jpeg_segment 49 50# This uses recursion... 510 name jpeg_segment 52>0 beshort 0xFFFE 53# Recursion handled by FFE0 54#>>(2.S+2) use jpeg_segment 55>>2 pstring/HJ x \b, comment: "%s" 56 57>0 beshort 0xFFC0 58>>(2.S+2) use jpeg_segment 59>>4 byte x \b, baseline, precision %d 60>>7 beshort x \b, %dx 61>>5 beshort x \b%d 62>>9 byte x \b, components %d 63 64>0 beshort 0xFFC1 65>>(2.S+2) use jpeg_segment 66>>4 byte x \b, extended sequential, precision %d 67>>7 beshort x \b, %dx 68>>5 beshort x \b%d 69>>9 byte x \b, components %d 70 71>0 beshort 0xFFC2 72>>(2.S+2) use jpeg_segment 73>>4 byte x \b, progressive, precision %d 74>>7 beshort x \b, %dx 75>>5 beshort x \b%d 76>>9 byte x \b, components %d 77 78# Define Huffman Tables 79>0 beshort 0xFFC4 80>>(2.S+2) use jpeg_segment 81 82>0 beshort 0xFFE1 83# Recursion handled by FFE0 84#>>(2.S+2) use jpeg_segment 85>>4 string Exif \b, Exif Standard: [ 86>>>10 indirect/r x 87>>>10 string x \b] 88 89# Application specific markers 90>0 beshort&0xFFE0 =0xFFE0 91>>(2.S+2) use jpeg_segment 92 93# DB: Define Quantization tables 94# DD: Define Restart interval [XXX: wrong here, it is 4 bytes] 95# D8: Start of image 96# D9: End of image 97# Dn: Restart 98>0 beshort&0xFFD0 =0xFFD0 99>>0 beshort&0xFFE0 !0xFFE0 100>>>(2.S+2) use jpeg_segment 101 102#>0 beshort x unknown %#x 103#>>(2.S+2) use jpeg_segment 104 105# HSI is Handmade Software's proprietary JPEG encoding scheme 1060 string hsi1 JPEG image data, HSI proprietary 107 108# From: David Santinoli <david@santinoli.com> 1090 string \x00\x00\x00\x0C\x6A\x50\x20\x20\x0D\x0A\x87\x0A JPEG 2000 110# From: Johan van der Knijff <johan.vanderknijff@kb.nl> 111# Added sub-entries for JP2, JPX, JPM and MJ2 formats; added mimetypes 112# https://github.com/bitsgalore/jp2kMagic 113# 114# Now read value of 'Brand' field, which yields a few possibilities: 115>20 string \x6a\x70\x32\x20 Part 1 (JP2) 116!:mime image/jp2 117>20 string \x6a\x70\x78\x20 Part 2 (JPX) 118!:mime image/jpx 119>20 string \x6a\x70\x6d\x20 Part 6 (JPM) 120!:mime image/jpm 121>20 string \x6d\x6a\x70\x32 Part 3 (MJ2) 122!:mime video/mj2 123 124# Type: JPEG 2000 codesream 125# From: Mathieu Malaterre <mathieu.malaterre@gmail.com> 1260 belong 0xff4fff51 JPEG 2000 codestream 12745 beshort 0xff52 128 129# JPEG extended range 1300 string \x49\x49\xbc 131>3 byte 1 132>>4 lelong%2 0 JPEG-XR 133!:mime image/jxr 134!:ext jxr 135 136# JPEG XL 137# From: Ian Tester 1380 string \xff\x0a JPEG XL codestream 139!:mime image/jxl 140!:ext jxl 141 142# JPEG XL (transcoded JPEG file) 1430 string \x00\x00\x00\x0cJXL\x20\x0d\x0a\x87\x0a JPEG XL container 144!:mime image/jxl 145!:ext jxl 146