Matteo Collina 22ab7d77f1 buffer: add Buffer.stringLength() ...

Add `Buffer.stringLength(input[, encoding])`, the counterpart of
`Buffer.byteLength()`: it returns the number of UTF-16 code units that
`buf.toString(encoding)` would produce, without decoding.

For UTF-8 the count is computed with simdutf. Invalid input is counted
with the same maximal-subpart replacement that the decoder applies, so
the result always matches `toString().length`. The other encodings are
computed from `byteLength` alone.

This lets code that accumulates streamed input check the result against
`buffer.constants.MAX_STRING_LENGTH` and size its memory budget before
decoding.

Refs: https://github.com/nodejs/node/issues/66062
Signed-off-by: Matteo Collina <hello@matteocollina.com>
PR-URL: https://github.com/nodejs/node/pull/66064
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day>

2026-09-19 05:21:30 +00:00

..

_buffer-compare-offset.node-bench.js

benchmark: implement node:bench version of bench tools

2026-09-03 15:37:21 +00:00

buffer-atob.js

benchmark: use assert.ok instead of assert

2024-08-04 13:29:34 +00:00

buffer-base64-decode-wrapped.js

…

buffer-base64-decode.js

benchmark: add benchmarks for encodings

2023-10-25 20:46:33 +00:00

buffer-base64-encode.js

benchmark: add benchmarks for encodings

2023-10-25 20:46:33 +00:00

buffer-base64url-decode.js

benchmark: add benchmarks for encodings

2023-10-25 20:46:33 +00:00

buffer-base64url-encode.js

benchmark: add benchmarks for encodings

2023-10-25 20:46:33 +00:00

buffer-btoa.js

benchmark: use assert.ok instead of assert

2024-08-04 13:29:34 +00:00

buffer-bytelength-buffer.js

benchmark: split Buffer.byteLength benchmark

2023-02-26 19:02:42 +01:00

buffer-bytelength-string.js

buffer: improve performance of multiple Buffer operations

2026-03-27 21:50:58 +00:00

buffer-compare-instance-method.js

benchmark: add trailing commas in benchmark/buffers

2023-02-04 18:19:25 +00:00

buffer-compare-offset.js

benchmark: add trailing commas in benchmark/buffers

2023-02-04 18:19:25 +00:00

buffer-compare.js

benchmark: add trailing commas in benchmark/buffers

2023-02-04 18:19:25 +00:00

buffer-concat-fill.js

benchmark: add trailing commas in benchmark/buffers

2023-02-04 18:19:25 +00:00

buffer-concat.js

benchmark: add trailing commas in benchmark/buffers

2023-02-04 18:19:25 +00:00

buffer-copy-bytes-from.js

buffer: improve performance of multiple Buffer operations

2026-03-27 21:50:58 +00:00

buffer-copy.js

benchmark: adjust byte size for buffer-copy

2024-10-14 12:14:01 +00:00

buffer-creation.js

benchmark: add trailing commas in benchmark/buffers

2023-02-04 18:19:25 +00:00

buffer-equals.js

benchmark: add trailing commas in benchmark/buffers

2023-02-04 18:19:25 +00:00

buffer-fill.js

buffer: improve performance of multiple Buffer operations

2026-03-27 21:50:58 +00:00

buffer-from.js

benchmark: add trailing commas in benchmark/buffers

2023-02-04 18:19:25 +00:00

buffer-hex-decode.js

benchmark: add benchmarks for encodings

2023-10-25 20:46:33 +00:00

buffer-hex-encode.js

benchmark: add benchmarks for encodings

2023-10-25 20:46:33 +00:00

buffer-indexof-number.js

benchmark: add trailing commas in benchmark/buffers

2023-02-04 18:19:25 +00:00

buffer-indexof.js

buffer: improve performance of multiple Buffer operations

2026-03-27 21:50:58 +00:00

buffer-isascii.js

benchmark: add buffer.isAscii benchmark

2024-09-06 17:46:49 +00:00

buffer-isutf8.js

benchmark: add buffer.isUtf8 bench

2024-09-06 17:46:49 +00:00

buffer-iterate.js

buffer: move SlowBuffer to EOL

2025-05-09 19:41:31 +00:00

buffer-normalize-encoding.js

benchmark: add trailing commas in benchmark/buffers

2023-02-04 18:19:25 +00:00

buffer-read-float.js

benchmark: add trailing commas in benchmark/buffers

2023-02-04 18:19:25 +00:00

buffer-read-with-byteLength.js

buffer: move SlowBuffer to EOL

2025-05-09 19:41:31 +00:00

buffer-read.js

buffer: move SlowBuffer to EOL

2025-05-09 19:41:31 +00:00

buffer-slice.js

buffer: move SlowBuffer to EOL

2025-05-09 19:41:31 +00:00

buffer-stringlength.js

buffer: add Buffer.stringLength()

2026-09-19 05:21:30 +00:00

buffer-swap.js

benchmark: add trailing commas in benchmark/buffers

2023-02-04 18:19:25 +00:00

buffer-tojson.js

benchmark: add trailing commas in benchmark/buffers

2023-02-04 18:19:25 +00:00

buffer-tostring-utf8-latin1.js

src: add Latin1 fast path in StringBytes::Encode utf8

2026-06-01 07:05:25 +00:00

buffer-tostring.js

buffer: improve performance of multiple Buffer operations

2026-03-27 21:50:58 +00:00

buffer-transcode.js

test: remove unnecessary process.exit calls from test files

2026-03-01 11:33:00 +00:00

buffer-write-string-short.js

buffer: use fast API for writing one-byte strings

2024-08-15 01:01:05 +00:00

buffer-write-string-utf8.js

src: use simdutf for two-byte strings in UTF-8 writes

2026-08-18 16:34:15 +00:00

buffer-write-string.js

benchmark: add trailing commas in benchmark/buffers

2023-02-04 18:19:25 +00:00

buffer-write.js

buffer: move SlowBuffer to EOL

2025-05-09 19:41:31 +00:00

buffer-zero.js

benchmark: add trailing commas in benchmark/buffers

2023-02-04 18:19:25 +00:00

dataview-set.js

benchmark: add trailing commas in benchmark/buffers

2023-02-04 18:19:25 +00:00