GIF_LSH_LENGTH = 2
GIF_LSW_LENGTH = 2
GIF_SIGNATURE_LENGTH = 3
GIF_VERSION_LENGTH = 3
JPG_DATA_PRECISION_LENGTH = 1
JPG_IMH_LENGTH_LENGTH = 2
JPG_IMW_LENGTH_LENGTH = 2
JPG_NUM_COMPONENTS_LENGTH = 1
JPG_PARAM_LENGTH_LENGTH = 2
M_APP0 = 0xE0
M_APP12 = 0xEC
M_COM = 0xFE
M_EOI = 0xD9
M_SOF0 = 0xC0
M_SOF1 = 0xC1
M_SOF2 = 0xC2
M_SOF3 = 0xC3
M_SOF5 = 0xC5
M_SOF6 = 0xC6
M_SOF7 = 0xC7
M_SOF9 = 0xC9
M_SOF10 = 0xCA
M_SOF11 = 0xCB
M_SOF13 = 0xCD
M_SOF14 = 0xCE
M_SOF15 = 0xCF
M_SOI = 0xD8
M_SOS = 0xDA
PNG_IHDR_CHUNKTYPE_LENGTH = 4
PNG_IHDR_IMH_LENGTH = 4
PNG_IHDR_IMW_LENGTH = 4
PNG_IHDR_LENGTH_LENGTH = 4
PNG_SIGNATURE_LENGTH = 8