X-Git-Url: https://git.p6c8.net/jirafeau_project.git/blobdiff_plain/3221172a6d3e623090449000b4f541849bc9f9a5..13e2e31c60052e3572ad1bb091bf81ae62f00aca:/lib/functions.php diff --git a/lib/functions.php b/lib/functions.php index 87d2cff..868d76e 100755 --- a/lib/functions.php +++ b/lib/functions.php @@ -499,7 +499,10 @@ function check_errors () if (!is_writable (VAR_ASYNC)) add_error (t('The async directory is not writable!'), VAR_ASYNC); - /* Check if the install.php script is still in the directory. */ + if (!is_writable (VAR_BLOCK)) + add_error (t('The block directory is not writable!'), VAR_BLOCK); + + /* Check if the install.php script is still in the directory. */ if (file_exists (JIRAFEAU_ROOT . 'install.php')) add_error (t('Installer script still present'), t('Please make sure to delete the installer script ' . @@ -920,4 +923,309 @@ jirafeau_async_end ($ref, $code) jirafeau_async_delete ($ref); return $md5_link . NL . $delete_link_code; } + +/** + * Delete a block. + * @param $id identifier of the block. + */ +function +jirafeau_block_delete_ ($id) +{ + $p = VAR_BLOCK . s2p ($id); + if (!file_exists ($p)) + return; + + if (file_exists ($p . $id)) + unlink ($p . $id); + if (file_exists ($p . $id . '_infos')) + unlink ($p . $id . '_infos'); + $parse = $p; + $scan = array(); + while (file_exists ($parse) + && ($scan = scandir ($parse)) + && count ($scan) == 2 // '.' and '..' folders => empty. + && basename ($parse) != basename (VAR_BLOCK)) + { + rmdir ($parse); + $parse = substr ($parse, 0, strlen($parse) - strlen(basename ($parse)) - 1); + } +} + +/** + * Create a file filled with zeros. + * @param $size size of the file. + * @return a string corresponding to an id or the string "Error" + */ +function +jirafeau_block_init ($size) +{ + if (!ctype_digit ($size) || $size <= 0) + return "Error"; + + /* Create folder. */ + $id; + do + { + $id = jirafeau_gen_random (32); + $p = VAR_BLOCK . s2p ($id); + } while (file_exists ($p)); + @mkdir ($p, 0755, true); + if (!file_exists ($p)) + { + echo "Error"; + return; + } + + /* Create block. */ + $p .= $id; + $h = fopen ($p, 'w'); + $fill = str_repeat ("\0", 1024); + for ($cnt = 0; $cnt < $size; $cnt += 1024) + { + if ($size - $cnt < 1024) + $fill = str_repeat ("\0", $size - $cnt); + if (fwrite ($h, $fill) === false) + { + fclose ($h); + jirafeau_block_delete_ ($id); + return "Error"; + } + } + fclose ($h); + + /* Generate a write/delete code. */ + $code = jirafeau_gen_random (12); + + /* Add block infos. */ + if (file_put_contents ($p . '_infos', date ('U') . NL . $size . NL . $code) === FALSE) + { + jirafeau_block_delete_ ($id); + return "Error"; + } + + return $id . NL . $code; +} + +/** + * Read some data in a block. + * @param $id identifier of the block + * @param $start where to read data (starting from zero). + * @param $length length to read. + * @return echo data + */ +function +jirafeau_block_read ($id, $start, $length) +{ + if (!ctype_digit ($start) || $start < 0 + || !ctype_digit ($length) || $length <= 0) + { + echo "Error"; + return; + } + + $p = VAR_BLOCK . s2p ($id) . $id; + if (!file_exists ($p)) + { + echo "Error"; + return; + } + + /* Check date. */ + $f = file ($p . '_infos'); + $date = trim ($f[0]); + $block_size = trim ($f[1]); + $stored_code = trim ($f[2]); + /* Update date. */ + if (date ('U') - $date > JIRAFEAU_HOUR + && date ('U') - $date < JIRAFEAU_MONTH) + { + if (file_put_contents ($p . '_infos', date ('U') . NL . $block_size . NL . $stored_code) === FALSE) + { + jirafeau_block_delete_ ($id); + echo "Error"; + return; + } + } + /* Remove data. */ + elseif (date ('U') - $date >= JIRAFEAU_MONTH) + { + echo date ('U'). " $date "; + jirafeau_block_delete_ ($id); + echo "Error"; + return; + } + + if ($start + $length > $block_size) + { + echo "Error"; + return; + } + + /* Read content. */ + header ('Content-Length: ' . $length); + header ('Content-Disposition: attachment'); + + $r = fopen ($p, 'r'); + if (fseek ($r, $start) != 0) + { + echo "Error"; + return; + } + $c = 1024; + for ($cnt = 0; $cnt < $length && !feof ($r); $cnt += 1024) + { + if ($length - $cnt < 1024) + $c = $length - $cnt; + print fread ($r, $c); + ob_flush(); + } + fclose ($r); +} + +/** + * Write some data in a block. + * @param $id identifier of the block + * @param $start where to writing data (starting from zero). + * @param $data data to write. + * @param $code code to allow writing. + * @return string "Ok" or string "Error". + */ +function +jirafeau_block_write ($id, $start, $data, $code) +{ + if (!ctype_digit ($start) || $start < 0 + || strlen ($code) == 0) + return "Error"; + + $p = VAR_BLOCK . s2p ($id) . $id; + if (!file_exists ($p)) + return "Error"; + + /* Check date. */ + $f = file ($p . '_infos'); + $date = trim ($f[0]); + $block_size = trim ($f[1]); + $stored_code = trim ($f[2]); + /* Update date. */ + if (date ('U') - $date > JIRAFEAU_HOUR + && date ('U') - $date < JIRAFEAU_MONTH) + { + if (file_put_contents ($p . '_infos', date ('U') . NL . $block_size . NL . $stored_code) === FALSE) + { + jirafeau_block_delete_ ($id); + return "Error"; + } + } + /* Remove data. */ + elseif (date ('U') - $date >= JIRAFEAU_MONTH) + { + jirafeau_block_delete_ ($id); + return "Error"; + } + + /* Check code. */ + if ($stored_code != $code) + { + echo "Error"; + return; + } + + /* Check data. */ + $size = $data['size']; + if ($size <= 0) + return "Error"; + if ($start + $size > $block_size) + return "Error"; + + /* Open data. */ + $r = fopen ($data['tmp_name'], 'r'); + + /* Open Block. */ + $w = fopen ($p, 'r+'); + if (fseek ($w, $start) != 0) + return "Error"; + + /* Write content. */ + $c = 1024; + for ($cnt = 0; $cnt <= $size && !feof ($w); $cnt += 1024) + { + if ($size - $cnt < 1024) + $c = $size - $cnt; + $d = fread ($r, $c); + fwrite ($w, $d); + } + fclose ($r); + fclose ($w); + unlink ($data['tmp_name']); + return "Ok"; +} + +/** + * Delete a block. + * @param $id identifier of the block. + * @param $code code to allow writing. + * @return string "Ok" or string "Error". + */ +function +jirafeau_block_delete ($id, $code) +{ + $p = VAR_BLOCK . s2p ($id) . $id; + + if (!file_exists ($p)) + return "Error"; + + $f = file ($p . '_infos'); + $date = trim ($f[0]); + $block_size = trim ($f[1]); + $stored_code = trim ($f[2]); + + if ($code != $stored_code) + return "Error"; + + jirafeau_block_delete_ ($id); + return "Ok"; +} + +/** + * Clean old unused blocks. + * @return number of cleaned blocks. + */ +function +jirafeau_admin_clean_block () +{ + $count = 0; + /* Get all blocks. */ + $stack = array (VAR_BLOCK); + while (($d = array_shift ($stack)) && $d != NULL) + { + $dir = scandir ($d); + + foreach ($dir as $node) + { + if (strcmp ($node, '.') == 0 || strcmp ($node, '..') == 0) + continue; + + if (is_dir ($d . $node)) + { + /* Push new found directory. */ + $stack[] = $d . $node . '/'; + } + elseif (is_file ($d . $node) && preg_match ('/\_infos/i', "$node")) + { + /* Read block informations. */ + $f = file ($d . $node); + $date = trim ($f[0]); + $block_size = trim ($f[1]); + if (date ('U') - $date >= JIRAFEAU_MONTH) + { + jirafeau_block_delete_ (substr($node, 0, -6)); + $count++; + } + } + } + } + return $count; +} + + ?>