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    MitMacher
    15 years ago
    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. But lower values then 1024 are bad overall because they slow down the whole process, so 4096 will be fine for all purposes, I guess.
    The error was caused by the use of "empty()".

    Here comes the corrected version which I have tested for all kind of files and length (up to 4,5 Gb!) without any error:

    <?php
    $fh     = fopen('Input-File', 'rb');
    //$fh2 = fopen('Output-File', 'wb');

    $cache = '';
    $eof = false;

    while (    1) {

    if (!    $eof) {
    if (!    feof($fh)) {
    $row = fgets($fh, 4096);
    } else {
    $row = '';
    $eof = true;
    }
    }

    if (    $cache !== '')
    $row = $cache.$row;
    elseif (    $eof)
    break;

    $b64 = base64_encode($row);
    $put = '';

    if (    strlen($b64) < 76) {
    if (    $eof) {
    $put = $b64."\n";
    $cache = '';
    } else {
    $cache = $row;
    }

    } elseif (    strlen($b64) > 76) {
    do {
    $put .= substr($b64, 0, 76)."\n";
    $b64 = substr($b64, 76);
    } while (    strlen($b64) > 76);

    $cache = base64_decode($b64);

    } else {
    if (!    $eof && $b64{75} == '=') {
    $cache = $row;
    } else {
    $put = $b64."\n";
    $cache = '';
    }
    }

    if (    $put !== '') {
    echo     $put;
    //fputs($fh2, $put);
    //fputs($fh2, base64_decode($put)); // for comparing
    }
    }

    //fclose($fh2);
    fclose($fh);
    ?>

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