168349Sobrien 268349Sobrien#------------------------------------------------------------------------------ 3284193Sdelphij# $File: jpeg,v 1.25 2015/01/02 16:56:50 christos Exp $ 468349Sobrien# JPEG images 568349Sobrien# SunOS 5.5.1 had 668349Sobrien# 768349Sobrien# 0 string \377\330\377\340 JPEG file 868349Sobrien# 0 string \377\330\377\356 JPG file 968349Sobrien# 1068349Sobrien# both of which turn into "JPEG image data" here. 1168349Sobrien# 1268349Sobrien0 beshort 0xffd8 JPEG image data 13186690Sobrien!:mime image/jpeg 14191736Sobrien!:apple 8BIMJPEG 15267843Sdelphij!:strength +2 1668349Sobrien>6 string JFIF \b, JFIF standard 1768349Sobrien# The following added by Erik Rossen <rossen@freesurf.ch> 1999-09-06 1868349Sobrien# in a vain attempt to add image size reporting for JFIF. Note that these 1968349Sobrien# tests are not fool-proof since some perfectly valid JPEGs are currently 2068349Sobrien# impossible to specify in magic(4) format. 2168349Sobrien# First, a little JFIF version info: 22133359Sobrien>>11 byte x \b %d. 23133359Sobrien>>12 byte x \b%02d 2468349Sobrien# Next, the resolution or aspect ratio of the image: 25284193Sdelphij>>13 byte 0 \b, aspect ratio 26284193Sdelphij>>13 byte 1 \b, resolution (DPI) 27284193Sdelphij>>13 byte 2 \b, resolution (DPCM) 28284193Sdelphij>>14 beshort x \b, density %dx 29284193Sdelphij>>16 beshort x \b%d 30284193Sdelphij>>4 beshort x \b, segment length %d 3168349Sobrien# Next, show thumbnail info, if it exists: 32133359Sobrien>>18 byte !0 \b, thumbnail %dx 33133359Sobrien>>>19 byte x \b%d 34284193Sdelphij>6 string Exif \b, Exif standard: [ 35284193Sdelphij>>12 indirect/r x 36284193Sdelphij>>12 string x \b] 37133359Sobrien 38284193Sdelphij# Jump to the first segment 39284193Sdelphij>(4.S+4) use jpeg_segment 4068349Sobrien 41284193Sdelphij# This uses recursion... 42284193Sdelphij0 name jpeg_segment 43284193Sdelphij>0 beshort 0xFFFE 44284193Sdelphij>>(2.S+2) use jpeg_segment 45284193Sdelphij>>2 pstring/HJ x \b, comment: "%s" 46284193Sdelphij 47284193Sdelphij>0 beshort 0xFFC0 48284193Sdelphij>>(2.S+2) use jpeg_segment 49284193Sdelphij>>4 byte x \b, baseline, precision %d 50284193Sdelphij>>7 beshort x \b, %dx 51284193Sdelphij>>5 beshort x \b%d 52284193Sdelphij>>9 byte x \b, frames %d 53284193Sdelphij 54284193Sdelphij>0 beshort 0xFFC1 55284193Sdelphij>>(2.S+2) use jpeg_segment 56284193Sdelphij>>4 byte x \b, extended sequential, precision %d 57284193Sdelphij>>7 beshort x \b, %dx 58284193Sdelphij>>5 beshort x \b%d 59284193Sdelphij>>9 byte x \b, frames %d 60284193Sdelphij 61284193Sdelphij>0 beshort 0xFFC2 62284193Sdelphij>>(2.S+2) use jpeg_segment 63284193Sdelphij>>4 byte x \b, progressive, precision %d 64284193Sdelphij>>7 beshort x \b, %dx 65284193Sdelphij>>5 beshort x \b%d 66284193Sdelphij>>9 byte x \b, frames %d 67284193Sdelphij 68284193Sdelphij# Define Huffman Tables 69284193Sdelphij>0 beshort 0xFFC4 70284193Sdelphij>>(2.S+2) use jpeg_segment 71284193Sdelphij 72284193Sdelphij>0 beshort 0xFFE1 73284193Sdelphij#>>(2.S+2) use jpeg_segment 74284193Sdelphij>>4 string Exif \b, Exif Standard: [ 75284193Sdelphij>>>10 indirect/r x 76284193Sdelphij>>>10 string x \b] 77284193Sdelphij 78284193Sdelphij# Application specific markers 79284193Sdelphij>0 beshort&0xFFE0 =0xFFE0 80284193Sdelphij>>(2.S+2) use jpeg_segment 81284193Sdelphij 82284193Sdelphij# DB: Define Quantization tables 83284193Sdelphij# DD: Define Restart interval [XXX: wrong here, it is 4 bytes] 84284193Sdelphij# D8: Start of image 85284193Sdelphij# D9: End of image 86284193Sdelphij# Dn: Restart 87284193Sdelphij>0 beshort&0xFFD0 =0xFFD0 88284193Sdelphij>>(2.S+2) use jpeg_segment 89284193Sdelphij 90284193Sdelphij#>0 beshort x unknown 0x%x 91284193Sdelphij#>>(2.S+2) use jpeg_segment 92284193Sdelphij 9368349Sobrien# HSI is Handmade Software's proprietary JPEG encoding scheme 9468349Sobrien0 string hsi1 JPEG image data, HSI proprietary 95111658Sobrien 96111658Sobrien# From: David Santinoli <david@santinoli.com> 97267843Sdelphij0 string \x00\x00\x00\x0C\x6A\x50\x20\x20\x0D\x0A\x87\x0A JPEG 2000 98267843Sdelphij# From: Johan van der Knijff <johan.vanderknijff@kb.nl> 99267843Sdelphij# Added sub-entries for JP2, JPX, JPM and MJ2 formats; added mimetypes 100267843Sdelphij# https://github.com/bitsgalore/jp2kMagic 101267843Sdelphij# 102267843Sdelphij# Now read value of 'Brand' field, which yields a few possibilities: 103267843Sdelphij>20 string \x6a\x70\x32\x20 Part 1 (JP2) 104267843Sdelphij!:mime image/jp2 105267843Sdelphij>20 string \x6a\x70\x78\x20 Part 2 (JPX) 106267843Sdelphij!:mime image/jpx 107267843Sdelphij>20 string \x6a\x70\x6d\x20 Part 6 (JPM) 108267843Sdelphij!:mime image/jpm 109267843Sdelphij>20 string \x6d\x6a\x70\x32 Part 3 (MJ2) 110267843Sdelphij!:mime video/mj2 111186690Sobrien 112186690Sobrien# Type: JPEG 2000 codesream 113186690Sobrien# From: Mathieu Malaterre <mathieu.malaterre@gmail.com> 114186690Sobrien0 belong 0xff4fff51 JPEG 2000 codestream 115186690Sobrien45 beshort 0xff52 116