fast 0..255 * 0..255 => 0..255 rounded multiplication

if there's a pending marker from the entropy stream, return that otherwise, fetch from the stream and get a marker. if there's no marker, return 0xff,

take a -128..127 value and stbi__clamp it and convert to 0..255

returns 1 if "a*b*c + add" has no negative terms/factors and doesn't overflow

* Encode a 4 bit word into a 8 bits with parity * Non standard version used in sx1272. * https://en.wikipedia.org/wiki/Hamming_code ***************

initialize a callback-based context

initialize a memory-decode context

returns 1 if the product is valid, 0 on overflow. negative factors are considered invalid.

This function adds the round key to state. The round key is added to the state by an XOR function.

clean up the temporary component buffers

decode a jpeg huffman value from the bitstream

after a restart interval, stbi__jpeg_reset the entropy decoder and the dc prediction

mallocs with size overflow checking

initialize a callback-based context

combined JPEG 'receive' and JPEG 'extend', since baseline always extends everything it receives.

returns 0..31 for the highest set bit

extract an arbitrarily-aligned N-bit value (N=bits) from v, and then make it 8-bits long and fractionally extend it to full full range.

returns STBI_rgb or whatever, 0 on error

Cipher is the main function that encrypts the PlainText.

return 1 if the sum is valid, 0 on overflow. negative terms are considered invalid.

@OPTIMIZE: provide an option that always forces left-predict or paeth predict