#gzip

This documents version 0.1.2. The support record tracks platform verification and exact-version publication evidence separately, including the frozen 0.1.1 stored-block encoder.

Compress stdin to a gzip stream, or use -c -n to compress named files while keeping the originals:

printf 'hello\n' | moonx cli/gzip > hello.gz
moonx cli/gzip -cn notes.txt > notes.txt.gz
moonx cli/gzip -dc notes.txt.gz
moonx cli/gzip -t notes.txt.gz

-d/--decompress decodes, -t/--test checks compressed data without writing decoded bytes, and -c/--stdout selects stdout. -n/--no-name omits saved names and timestamps. Multiple operands are processed in order; - reads stdin. The encoder uses pure MoonBit LZ matching with a 32 KiB history and 3–258 byte matches. It compares complete stored/fixed/dynamic DEFLATE bit costs, including headers and alignment, and can extend an open Huffman block. Input is processed in 64 KiB chunks with bounded history, tokens and coding tables. -1 through -9 select search effort, defaulting to -6; --fast aliases -1 and --best aliases -9. The last level option wins, including grouped short options. Levels are accepted and ignored when decompressing or testing. Compressed bytes need not match GNU's encoding. All nine levels pass the direct Native/Wasm GNU roundtrips and selected size limits in the G1 development report. Published MoonX and performance acceptance remain open.

Decompression accepts concatenated members, optional names, comments and extra header fields, and verifies header CRC, payload CRC and size. Decoded bytes already written remain visible if a later member or trailer fails. Zero padding is accepted; trailing garbage produces a warning and status 2 (-q suppresses the warning). Input and format failures return 1. Both directions stream input and output in bounded chunks. Decoding uses 64 KiB input/output buffers, a 32 KiB history window and bounded Huffman lookup tables; it does not retain the whole compressed input or decoded output. The G2 development report records byte/error checks, direct timings and memory observations.

Named-file compression requires -cn; named-file decompression requires -c unless only testing. In-place replacement, saved metadata, recursive traversal, listing and force/pass-through modes are rejected. The public Bytes decoder remains an adapter; its caller still holds the supplied bytes. --help and --version describe this command.

#Standalone metadata

Standalone --version prints exactly gzip 0.1.2 followed by one newline. Standalone --help starts with Usage: gzip, lists both metadata options, and ends with a newline. Both write to stdout, leave stdin unread, and exit with status 0. Exact-version publication and verification remain recorded separately in the support record.

Source Files

main.mbt

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