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Reading the input file in chunks that are a multiple of three bytes in length results in a chunk that can be encoded independently of the rest of the input file.
MIME additionally enforces a line length of 76 characters plus the CRLF.
There is no need to retain left-over symbols (either six- or eight-bit) from one chunk to the next.
Just read a chunk, encode it, write it out, and go on to the next chunk.
So the correct function should be: I needed a simple way to obfuscate auto_increment primary keys in databases when they are visible to users in URIs or API calls.
The users should not be able to increment the id in the URL and see the next data record in the database table.
So if you read from the input file in chunks of 8151 (=57*143) bytes you will get (up to) 8151 eight-bit symbols, which encode as exactly 10868 six-bit symbols, which then wrap to exactly 143 MIME-formatted lines.
76 characters is enough for 19 quadruples of six-bit symbols thus representing 19 triples of eight-bit symbols.
Reading 57 eight-bit symbols provides exactly enough data for a complete MIME-formatted line.
function urlsafe_b64encode($string) function urlsafe_b64decode($string) Php version of perl's MIME:: Base64:: URLSafe, that provides an url-safe base64 string encoding/decoding (compatible with python base64's urlsafe methods) Unfortunately my "function" for encoding base64 on-the-fly from 2007 [which has been removed from the manual in favor of this post] had 2 errors!
The first led to an endless loop because of a missing "$feof"-check, the second caused the rare mentioned errors when encoding failed for some reason in larger files, especially when setting fgets($fh, 2) for example.