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#311 in Encoding
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decart is a library and a command-line tool for reading and (in the future) generating "Octocarts",
CHIP-8 game cartridges for the Octo environment, written in Rust.
- Decoding: You can extract the program source code and runtime settings from an
Octocart file. The source code can be assembled into CHIP-8 bytecode with Octo or
decasm. The runtime settings can be given to a CHIP-8 interpreter like Octo or
deca, or saved as JSON for the CHIP-8 Archive or an
.octo.rcfile for C-Octo or
- Encoding: TODO
Octo cartridge files, or Octocarts, are GIF89a images with a payload steganographically embedded in one or more animation frames. Data is stored in the least significant bits of colors – 1 from the red/blue channels and 2 from the green channel – allowing us to pack a hidden byte into every 2 successive pixels.
The payload consists of a 32-bit length, followed by a sequence of ASCII bytes consisting of the JSON-encoded options dictionary and source text.
An Octo cartridge contains the source code of an Octo program, and a set of
configuration options (parsed by
for the CHIP-8 interpreter telling it how to run the program.