deflate(data, level) -> compressed, err

Compress data using raw deflate (no header/trailer)

Level ranges from 0 (no compression) to 10 (maximum), default 6.

compress(data, level) -> compressed, err

Compress data with zlib wrapping (header + adler32 footer)

Level ranges from 0 (no compression) to 10 (maximum), default 6.

gzip(data, level) -> compressed, err

Compress data in gzip format (RFC 1952)

Level ranges from 0 (no compression) to 10 (maximum), default 6. Output is compatible with the gzip command-line tool.

inflate(data, max_size) -> decompressed, bytes_consumed, err

Decompress raw deflate data

Returns the decompressed data and the number of compressed bytes consumed from the input. max_size caps the output buffer to guard against decompression bombs (default 64 MB).

decompress(data, max_size) -> decompressed, bytes_consumed, err

Decompress zlib-wrapped data

Input must include the zlib header and adler32 footer. Returns the decompressed data and the number of bytes consumed from the input. max_size caps the output buffer (default 64 MB).

gunzip(data, max_size) -> decompressed, bytes_consumed, err

Decompress gzip data (RFC 1952)

Parses the gzip header, inflates the payload, and validates the CRC32 trailer. Compatible with output from the gzip command. Returns the decompressed data and total bytes consumed. max_size caps the output buffer (default 64 MB).

crc32(data, initial) -> checksum

Compute CRC-32 checksum

Returns the CRC-32 value as a number. Pass a previous result as initial to compute a running checksum over multiple chunks.

adler32(data, initial) -> checksum

Compute Adler-32 checksum

Returns the Adler-32 value as a number. Pass a previous result as initial to compute a running checksum over multiple chunks.