re-add library escpos

htdocs/includes/mike42/escpos-php/src/AbstractCapabilityProfile.php

@@ -0,0 +1,61 @@
+<?php
+/**
+ * Not all printers support the same subset of available Esc/POS commands. Profiles allow you to specify
+ * which features are available on your printer, so that Escpos is less likely to send unsupported commands.
+ */
+abstract class AbstractCapabilityProfile {
+	/**
+	 * Sub-classes must be retrieved via getInstance(), so that validation
+	 * can be attached to guarantee that dud profiles are not used on an Escpos object.
+	 */
+	protected final function __construct() {
+		// This space intentionally left blank.
+	}
+
+	/**
+	 * If getSupportedCodePages contains custom code pages, their character maps must be provided here.
+	 */
+	abstract function getCustomCodePages();
+
+	/**
+	 * Return a map of code page numbers to names for this printer. Names
+	 * should match iconv code page names where possible (non-matching names will not be used).
+	 */
+	abstract function getSupportedCodePages();
+
+	/**
+	 * True to support barcode "function b", false to use only function A.
+	 */
+	abstract function getSupportsBarcodeB();
+
+	/**
+	 * True for bitImage support, false for no bitImage support.
+	 */
+	abstract function getSupportsBitImage();
+
+	/**
+	 * True for graphics support, false for no graphics support.
+	 */
+	abstract function getSupportsGraphics();
+
+	/**
+	 * True for 'STAR original' commands, false for standard ESC/POS only.
+	 */
+	abstract function getSupportsStarCommands();
+
+	/**
+	 * True if the printer renders its own QR codes, false to send an image.
+	 */
+	abstract function getSupportsQrCode();
+
+	/**
+	 * @return AbstractCapabilityProfile Instance of sub-class.
+	 */
+	public static final function getInstance() {
+		static $profile = null;
+		if ($profile === null) {
+			$profile = new static();
+		}
+		return $profile;
+	}
+}