losslessformate

LosslessFormate is a hypothetical, open, lossless data encoding format designed for archival and interchange of arbitrary digital content. It is intended to provide a single, self-describing file structure that supports raw data payloads as well as metadata, enabling exact reconstruction of the original data without loss.

The format defines a container that bundles a header, an optional set of metadata blocks, and one or more compressed data blocks. Each block carries a length, a checksum, and an index to support random access and streaming. A version tag and a magic signature are included to aid validation and forward compatibility.

LosslessFormate supports streaming encoding and decoding, with block-level parallelism to leverage multi-core processors. It allows partial decompression, so consumers can retrieve specific regions without decoding the entire payload. The specification supports cross-platform byte ordering and includes a reference API for common programming languages.

Compression in LosslessFormate relies on a combination of a dictionary-based encoder and entropy coding. A sliding-window dictionary captures repeated patterns, while Huffman or arithmetic coding reduces residual entropy. The format provides selectable profiles ranging from fast to high- compression, and can apply optional pre-processing transforms for data types such as text or images.

LosslessFormate is a theoretical format with publicly documented specifications and reference implementations in several languages. It has no widespread standardization body endorsement, but is used in academic examples and as a basis for comparing lossless data formats. Real-world use tends to favor established formats like ZIP, PNG, or FLAC for specific domains.