jpeg revision 276415
1 2#------------------------------------------------------------------------------ 3# $File: jpeg,v 1.21 2014/09/12 20:47:00 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 beshort 0xffd8 JPEG image data 13!:mime image/jpeg 14!:apple 8BIMJPEG 15!:strength +2 16>6 string JFIF \b, JFIF standard 17# The following added by Erik Rossen <rossen@freesurf.ch> 1999-09-06 18# in a vain attempt to add image size reporting for JFIF. Note that these 19# tests are not fool-proof since some perfectly valid JPEGs are currently 20# impossible to specify in magic(4) format. 21# First, a little JFIF version info: 22>>11 byte x \b %d. 23>>12 byte x \b%02d 24# Next, the resolution or aspect ratio of the image: 25>>13 byte 0 \b, aspect ratio 26>>13 byte 1 \b, resolution (DPI) 27>>13 byte 2 \b, resolution (DPCM) 28>>14 beshort x \b, density %dx 29>>16 beshort x \b%d 30>>4 beshort x \b, segment length %d 31# Next, show thumbnail info, if it exists: 32>>18 byte !0 \b, thumbnail %dx 33>>>19 byte x \b%d 34 35# EXIF moved down here to avoid reporting a bogus version number, 36# and EXIF version number printing added. 37# - Patrik R=E5dman <patrik+file-magic@iki.fi> 38>6 string Exif \b, EXIF standard 39# Look for EXIF IFD offset in IFD 0, and then look for EXIF version tag in EXIF IFD. 40# All possible combinations of entries have to be enumerated, since no looping 41# is possible. And both endians are possible... 42# The combinations included below are from real-world JPEGs. 43# Little-endian 44>>12 string II 45# IFD 0 Entry #5: 46>>>70 leshort 0x8769 47# EXIF IFD Entry #1: 48>>>>(78.l+14) leshort 0x9000 49>>>>>(78.l+23) byte x %c 50>>>>>(78.l+24) byte x \b.%c 51>>>>>(78.l+25) byte !0x30 \b%c 52# IFD 0 Entry #9: 53>>>118 leshort 0x8769 54# EXIF IFD Entry #3: 55>>>>(126.l+38) leshort 0x9000 56>>>>>(126.l+47) byte x %c 57>>>>>(126.l+48) byte x \b.%c 58>>>>>(126.l+49) byte !0x30 \b%c 59# IFD 0 Entry #10 60>>>130 leshort 0x8769 61# EXIF IFD Entry #3: 62>>>>(138.l+38) leshort 0x9000 63>>>>>(138.l+47) byte x %c 64>>>>>(138.l+48) byte x \b.%c 65>>>>>(138.l+49) byte !0x30 \b%c 66# EXIF IFD Entry #4: 67>>>>(138.l+50) leshort 0x9000 68>>>>>(138.l+59) byte x %c 69>>>>>(138.l+60) byte x \b.%c 70>>>>>(138.l+61) byte !0x30 \b%c 71# EXIF IFD Entry #5: 72>>>>(138.l+62) leshort 0x9000 73>>>>>(138.l+71) byte x %c 74>>>>>(138.l+72) byte x \b.%c 75>>>>>(138.l+73) byte !0x30 \b%c 76# IFD 0 Entry #11 77>>>142 leshort 0x8769 78# EXIF IFD Entry #3: 79>>>>(150.l+38) leshort 0x9000 80>>>>>(150.l+47) byte x %c 81>>>>>(150.l+48) byte x \b.%c 82>>>>>(150.l+49) byte !0x30 \b%c 83# EXIF IFD Entry #4: 84>>>>(150.l+50) leshort 0x9000 85>>>>>(150.l+59) byte x %c 86>>>>>(150.l+60) byte x \b.%c 87>>>>>(150.l+61) byte !0x30 \b%c 88# EXIF IFD Entry #5: 89>>>>(150.l+62) leshort 0x9000 90>>>>>(150.l+71) byte x %c 91>>>>>(150.l+72) byte x \b.%c 92>>>>>(150.l+73) byte !0x30 \b%c 93# Big-endian 94>>12 string MM 95# IFD 0 Entry #9: 96>>>118 beshort 0x8769 97# EXIF IFD Entry #1: 98>>>>(126.L+14) beshort 0x9000 99>>>>>(126.L+23) byte x %c 100>>>>>(126.L+24) byte x \b.%c 101>>>>>(126.L+25) byte !0x30 \b%c 102# EXIF IFD Entry #3: 103>>>>(126.L+38) beshort 0x9000 104>>>>>(126.L+47) byte x %c 105>>>>>(126.L+48) byte x \b.%c 106>>>>>(126.L+49) byte !0x30 \b%c 107# IFD 0 Entry #10 108>>>130 beshort 0x8769 109# EXIF IFD Entry #3: 110>>>>(138.L+38) beshort 0x9000 111>>>>>(138.L+47) byte x %c 112>>>>>(138.L+48) byte x \b.%c 113>>>>>(138.L+49) byte !0x30 \b%c 114# EXIF IFD Entry #5: 115>>>>(138.L+62) beshort 0x9000 116>>>>>(138.L+71) byte x %c 117>>>>>(138.L+72) byte x \b.%c 118>>>>>(138.L+73) byte !0x30 \b%c 119# IFD 0 Entry #11 120>>>142 beshort 0x8769 121# EXIF IFD Entry #4: 122>>>>(150.L+50) beshort 0x9000 123>>>>>(150.L+59) byte x %c 124>>>>>(150.L+60) byte x \b.%c 125>>>>>(150.L+61) byte !0x30 \b%c 126 127# Jump to the first segment 128>(4.S+4) use jpeg_segment 129 130# This uses recursion... 1310 name jpeg_segment 132>0 beshort 0xFFFE 133>>(2.S+2) use jpeg_segment 134>>2 pstring/HJ x \b, comment: "%s" 135 136>0 beshort 0xFFC0 137>>(2.S+2) use jpeg_segment 138>>4 byte x \b, baseline, precision %d 139>>7 beshort x \b, %dx 140>>5 beshort x \b%d 141>>9 byte x \b, frames %d 142 143>0 beshort 0xFFC1 144>>(2.S+2) use jpeg_segment 145>>4 byte x \b, extended sequential, precision %d 146>>7 beshort x \b, %dx 147>>5 beshort x \b%d 148>>9 byte x \b, frames %d 149 150>0 beshort 0xFFC2 151>>(2.S+2) use jpeg_segment 152>>4 byte x \b, progressive, precision %d 153>>7 beshort x \b, %dx 154>>5 beshort x \b%d 155>>9 byte x \b, frames %d 156 157# Define Huffman Tables 158>0 beshort 0xFFC4 159>>(2.S+2) use jpeg_segment 160 161# Application specific markers 162>0 beshort&0xFFE0 =0xFFE0 163>>(2.S+2) use jpeg_segment 164 165# DB: Define Quantization tables 166# DD: Define Restart interval [XXX: wrong here, it is 4 bytes] 167# D8: Start of image 168# D9: End of image 169# Dn: Restart 170>0 beshort&0xFFD0 =0xFFD0 171>>(2.S+2) use jpeg_segment 172 173# HSI is Handmade Software's proprietary JPEG encoding scheme 1740 string hsi1 JPEG image data, HSI proprietary 175 176# From: David Santinoli <david@santinoli.com> 1770 string \x00\x00\x00\x0C\x6A\x50\x20\x20\x0D\x0A\x87\x0A JPEG 2000 178# From: Johan van der Knijff <johan.vanderknijff@kb.nl> 179# Added sub-entries for JP2, JPX, JPM and MJ2 formats; added mimetypes 180# https://github.com/bitsgalore/jp2kMagic 181# 182# Now read value of 'Brand' field, which yields a few possibilities: 183>20 string \x6a\x70\x32\x20 Part 1 (JP2) 184!:mime image/jp2 185>20 string \x6a\x70\x78\x20 Part 2 (JPX) 186!:mime image/jpx 187>20 string \x6a\x70\x6d\x20 Part 6 (JPM) 188!:mime image/jpm 189>20 string \x6d\x6a\x70\x32 Part 3 (MJ2) 190!:mime video/mj2 191 192# Type: JPEG 2000 codesream 193# From: Mathieu Malaterre <mathieu.malaterre@gmail.com> 1940 belong 0xff4fff51 JPEG 2000 codestream 19545 beshort 0xff52 196