Module core 

Functions

decode_mmap_inplace

Decode base64 from a mutable buffer (MAP_PRIVATE mmap or owned Vec). Strips whitespace in-place using SIMD memchr2 gap-copy, then decodes in-place with base64_simd::decode_inplace. Zero additional allocations.

decode_owned

Decode base64 from an owned Vec (in-place whitespace strip + decode).

decode_stream

Stream-decode from a reader to a writer. Used for stdin processing. In-place strip + decode: read chunk -> strip whitespace in-place in read buffer -> decode in-place -> write. Eliminates separate clean buffer allocation (saves 32MB). Uses 32MB read buffer for maximum pipe throughput — read_full retries to fill the entire buffer from the pipe, and 32MB means even large inputs (up to ~24MB after base64 encoding of 18MB raw) are read in a single syscall batch.

decode_to_writer

Decode base64 data and write to output (borrows data, allocates clean buffer). When ignore_garbage is true, strip all non-base64 characters. When false, only strip whitespace (standard behavior).

encode_stream

Stream-encode from a reader to a writer. Used for stdin processing. Dispatches to specialized paths for wrap_col=0 (no wrap) and wrap_col>0 (wrapping).

encode_to_writer

Encode data and write to output with line wrapping. Uses SIMD encoding with fused encode+wrap for maximum throughput.