Quoted-Printable Encoder Encode text to Quoted-Printable format for email transport.

The qpEncode function uses a TextEncoder from the Encoding API to convert input strings into byte sequences, which are then iterated over to determine whether each byte should be encoded or left as-is. This process involves checking if a byte falls within specific ASCII ranges, such as between 33 and 60, or between 62 and 126, in which case it is appended directly to the result string without modification. Bytes outside these ranges are encoded using the format =HH, where HH represents the hexadecimal value of the byte, padded with zeros if necessary to ensure a two-digit representation.

To prevent excessively long lines, the tool implements line wrapping by tracking the current line length and inserting a soft line break sequence (= followed by \r\n) whenever the limit of 75 characters is exceeded. This ensures compliance with RFC 2045 specifications for quoted-printable encoding. The use of React's useCallback hook allows the onProcess function to memoize the qpEncode function, preventing unnecessary re-renders and optimizing performance. When processing input strings, it checks each byte individually, handling special cases such as tabs and spaces at the end of lines, which are encoded to prevent data corruption during transmission.

In terms of character encoding, the tool relies on the UTF-8 encoding scheme implicitly supported by the TextEncoder API, allowing it to handle a wide range of Unicode characters. The qpEncode function's use of bitwise operations and hexadecimal conversions enables efficient encoding of non-printable bytes, while its line wrapping logic ensures that the output remains readable and compliant with MIME standards. By using JavaScript's built-in string manipulation capabilities and React's hooks for optimization, the tool provides accurate quoted-printable encoding functionality entirely on the client-side, eliminating reliance on server-side dependencies. The qpEncode function's implementation details are also influenced by the requirements of RFC 2045, which dictates specific rules for encoding certain characters, such as the = character itself being encoded as =3D.