Module core 

Functions

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. Fused single-pass: read chunk -> strip whitespace -> decode immediately. Uses 8MB read buffer for maximum pipe throughput — read_full retries to fill the entire buffer from the pipe, saturating the 4MB pipe buffer and reducing syscall count. 8MB means ~2 read+decode+write cycles for 10MB. memchr2-based SIMD whitespace stripping handles the common case efficiently.

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.