From: Roland Haeder <roland@mxchange.org>
Date: Sat, 17 May 2014 20:41:22 +0000 (+0200)
Subject: Continued with file-based stacks:
X-Git-Url: https://git.mxchange.org/?p=core.git;a=commitdiff_plain;h=2724091df3f002f07609232a74ad5620934dbb47

Continued with file-based stacks:
- added flushFileHeader()
- still there will be a lot stub messages

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

diff --git a/contrib/file_stack/format.txt b/contrib/file_stack/format.txt
index 40044386..637baf6f 100644
--- a/contrib/file_stack/format.txt
+++ b/contrib/file_stack/format.txt
@@ -5,11 +5,11 @@ This is the format for a file-based stack which works as any Stackable class.
 
 General made up:
 
-Purpose: | "magic"   | separator | count    | position      | separator |
----------+-----------+-----------+----------+---------------+-----------+
-Bytes:   | 9         | 1         | 20 (hex) | 2 - n^2 (hex) | 1         |
----------+-----------+-----------+----------+---------------+-----------+
-Example: | STACKv1.0 | 00        | 00...ff  | 05            | ff        |
+Purpose: | "magic"   | separator | count    | position | separator |
+---------+-----------+-----------+----------+----------+-----------+
+Bytes:   | 9         | 1         | 20 (hex) | 20 (hex) | 1         |
+---------+-----------+-----------+----------+----------+-----------+
+Example: | STACKv1.0 | 00        | 00...ff  | 00...ff  | ff        |
 
 Continued:
 
diff --git a/inc/classes/main/stacker/file/class_BaseFileStack.php b/inc/classes/main/stacker/file/class_BaseFileStack.php
index f0539e10..8491479d 100644
--- a/inc/classes/main/stacker/file/class_BaseFileStack.php
+++ b/inc/classes/main/stacker/file/class_BaseFileStack.php
@@ -42,6 +42,16 @@ class BaseFileStack extends BaseStacker {
 	 */
 	const SEPARATOR_HASH_NAME = 0x05;
 
+	/**
+	 * Length of count
+	 */
+	const COUNT_LENGTH = 20;
+
+	/**
+	 * Length of position
+	 */
+	const COUNT_POSITION = 20;
+
 	/**
 	 * Protected constructor
 	 *
@@ -103,6 +113,50 @@ class BaseFileStack extends BaseStacker {
 		return $isInitialized;
 	}
 
+	/**
+	 * Creates the file-stack's header
+	 *
+	 * @return	void
+	 */
+	private function createFileHeader () {
+		// The file's header should not be initialized here
+		assert(!$this->isFileHeaderInitialized());
+
+		// Init	 counter
+		$this->getIteratorInstance()->initCounter();
+
+		// Flush file header
+		$this->flushFileHeader();
+	}
+
+	/**
+	 * Flushes the file header
+	 *
+	 * @return	void
+	 */
+	private function flushFileHeader () {
+		// Put all informations together
+		$header = sprintf('%s%s%s%s%s',
+			// Magic
+			self::STACK_MAGIC,
+
+			// Separator magic<->count
+			chr(self::SEPARATOR_MAGIC_COUNT),
+
+			// Total entries (will be zero) and pad it to 20 chars
+			str_pad($this->dec2hex($this->getIteratorInstance()->getCount()), self::COUNT_LENGTH, '0', STR_PAD_LEFT),
+
+			// Position (will be zero)
+			str_pad($this->dec2hex(0, 2), self::COUNT_POSITION, '0', STR_PAD_LEFT),
+
+			// Separator position<->entries
+			chr(self::SEPARATOR_SEEK_POS_ENTRIES)
+		);
+
+		// Write it to disk
+		$this->getIteratorInstance()->writeAtPosition(0, $header);
+	}
+
 	/**
 	 * Initializes this file-based stack.
 	 *
@@ -129,6 +183,9 @@ class BaseFileStack extends BaseStacker {
 		} else {
 			// No, then create it (which may pre-allocate the stack)
 			$this->createFileHeader();
+
+			// And pre-allocate a bit
+			$this->preAllocateFile();
 		}
 	}