Module: Cul::Image::Magic

Defined in:

lib/cul_image_props/image/magic.rb

Constant Summary

BMP =

“x42x4D”

[0x42, 0x4d]

GIF =

“x47x49x46x38”

[0x47,0x49,0x46,0x38]

JPEG =

“xFFxD8”

[0xff,0xd8]

JFM_BYTES =

[[0xff,0xc0],[0xff,0xc1],[0xff,0xc2],[0xff,0xc5],[0xff,0xc6],[0xff,0xc9],[0xff,0xca],[0xff,0xcd],[0xff,0xce]]

JPEG_FRAME_MARKERS =

JFM_BYTES.collect {|bytes| bytes.pack('C*')}

JPEG_SEGMENTS =

{
  [0xFF,0xE0]=>"APP0",
  [0xFF,0xE1]=>"APP1",
  [0xFF,0xC1]=>"SOF1", # image data: extended sequential dct
  [0xFF,0xC2]=>"SOF2", # image data: progressive dct
  [0xFF,0xC4]=>"DHT", # image data: huffman table(s)
  [0xFF,0xDA]=>"SOS", # image data: start of scan
  [0xFF,0xDB]=>"DQT" # quantization tables
}

PNG =

“x89x50x4ex47x0dx0ax1ax0a”

[0x89,0x50,0x4e,0x47,0x0d,0x0a,0x1a,0x0a]

TIFF_MOTOROLA_BE =

“x4dx4dx00x2a”

[0x4d,0x4d,0x00,0x2a]

TIFF_INTEL_LE =

“x49x49x2ax00”

[0x49,0x49,0x2a,0x00]