From: Roland Haeder <roland@mxchange.org>
Date: Fri, 30 May 2014 21:26:19 +0000 (+0200)
Subject: Rewrote next() to avoid loading whole empty file.
X-Git-Url: https://git.mxchange.org/?p=core.git;a=commitdiff_plain;h=2fec9045a98aa767876276a0ef934b8a3eccc5fa;ds=sidebyside

Rewrote next() to avoid loading whole empty file.

Signed-off-by: Roland Häder <roland@mxchange.org>
---

diff --git a/inc/classes/main/file_directories/class_BaseFile.php b/inc/classes/main/file_directories/class_BaseFile.php
index c96a4440..1d3dac19 100644
--- a/inc/classes/main/file_directories/class_BaseFile.php
+++ b/inc/classes/main/file_directories/class_BaseFile.php
@@ -722,7 +722,6 @@ y	 * @return	void
 	 * Advances to next "block" of bytes
 	 *
 	 * @return	void
-	 * @todo	This method will load large but empty files in a whole
 	 */
 	public function next () {
 		// Is there nothing to read?
@@ -740,17 +739,37 @@ y	 * @return	void
 		// Short be more than zero!
 		assert($length > 0);
 
-		// Wait until a entry/block separator has been found
+		// Read possibly back-buffered bytes from previous call of next().
 		$data = $this->getBackBuffer();
+
+		/*
+		 * Read until a entry/block separator has been found. The next read
+		 * "block" may not fit, so this loop will continue until the EOB or EOF
+		 * has been reached whatever comes first.
+		 */
 		while ((!$this->isEndOfFileReached()) && (!self::isBlockSeparatorFound($data))) {
-			// Then read the block
-			$data .= $this->read($length);
-			//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('data()=' . strlen($data));
+			// Then read the next possible block
+			$block = $this->read($length);
+
+			// Is it all empty?
+			if (strlen(trim($block)) == 0) {
+				// Mark this block as empty
+				$this->markCurrentBlockAsEmpty($length);
+
+				// Skip to next block
+				continue;
+			} // END - if
+
+			// At this block then
+			$data .= $block;
+
+			// A debug message
+			//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d] data()=%s', __FUNCTION__, __LINE__, strlen($data)));
 		} // END - if
 
 		// EOF reached?
 		if ($this->isEndOfFileReached()) {
-			// Set whole data as current block
+			// Set whole data as current read block
 			//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('Calling setCurrentBlock(' . strlen($data) . ') ...');
 			$this->setCurrentBlock($data);