From: David ‘Bombe’ Roden <bombe@pterodactylus.net>
Date: Sat, 23 May 2009 15:18:48 +0000 (+0200)
Subject: Add toByte() method.
X-Git-Url: https://git.pterodactylus.net/?a=commitdiff_plain;h=2e719ee43cf1b21c9445c67a0707e8373d77ee66;p=jSite2.git

Add toByte() method.
---

diff --git a/src/net/pterodactylus/util/number/Hex.java b/src/net/pterodactylus/util/number/Hex.java
index 246fa41..3f6145f 100644
--- a/src/net/pterodactylus/util/number/Hex.java
+++ b/src/net/pterodactylus/util/number/Hex.java
@@ -61,4 +61,26 @@ public class Hex {
 		return hexString.toString();
 	}
 
+	/**
+	 * Decodes a hexadecimal string into a byte array.
+	 *
+	 * @param hexString
+	 *            The hexadecimal representation to decode
+	 * @return The decoded byte array
+	 * @see Integer#parseInt(java.lang.String, int)
+	 */
+	public static byte[] toByte(String hexString) {
+		if ((hexString.length() & 0x01) == 0x01) {
+			/* odd length, this is not correct. */
+			throw new IllegalArgumentException("hex string must have even length.");
+		}
+		byte[] dataBytes = new byte[hexString.length() / 2];
+		for (int stringIndex = 0; stringIndex < hexString.length(); stringIndex += 2) {
+			String hexNumber = hexString.substring(stringIndex, stringIndex + 2);
+			byte dataByte = (byte) Integer.parseInt(hexNumber, 16);
+			dataBytes[stringIndex / 2] = dataByte;
+		}
+		return dataBytes;
+	}
+
 }