+ return $md5_link . NL . $delete_link_code . NL . urlencode($crypt_key);
+}
+
+/**
+ * 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;
+}
+
+/** Get block size in bytes.
+ * @param $id identifier of the block
+ * @return block size in bytes
+ */
+function
+jirafeau_block_get_size ($id)
+{
+ $p = VAR_BLOCK . s2p ($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)
+ {
+ echo date ('U'). " $date ";
+ jirafeau_block_delete_ ($id);
+ return "Error";
+ }
+
+ return $block_size;
+}
+
+/**
+ * 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";
git.p6c8.net / jirafeau.git / blobdiff