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 16MB read buffer to reduce syscalls and memchr2-based SIMD whitespace stripping for the common case (only \n and \r whitespace in base64 streams).

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. Uses 3MB read chunks (aligned to 3 bytes for padding-free intermediate encoding). 3MB is optimal for piped input: large enough for good throughput, small enough that read_full() fills the buffer quickly from pipes (3 reads at 1MB pipe size).

encode_to_writer

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