X-Git-Url: http://git.nikiroo.be/?a=blobdiff_plain;f=src%2Fbe%2Fnikiroo%2Futils%2Fstreams%2FStreamUtils.java;fp=src%2Fbe%2Fnikiroo%2Futils%2Fstreams%2FStreamUtils.java;h=6b8251a6e692f498452d8dcacab6d0d1958318f7;hb=c8ce09c4dc57142f94afcdc290dd79c4bddf7820;hp=0000000000000000000000000000000000000000;hpb=8e76f6ab13a8a4a651f2518b6c91d5e6424c7922;p=nikiroo-utils.git

diff --git a/src/be/nikiroo/utils/streams/StreamUtils.java b/src/be/nikiroo/utils/streams/StreamUtils.java
new file mode 100644
index 0000000..6b8251a
--- /dev/null
+++ b/src/be/nikiroo/utils/streams/StreamUtils.java
@@ -0,0 +1,70 @@
+package be.nikiroo.utils.streams;
+
+import java.io.UnsupportedEncodingException;
+
+/**
+ * Some non-public utilities used in the stream classes.
+ * 
+ * @author niki
+ */
+class StreamUtils {
+	/**
+	 * Check if the buffer starts with the given search term (given as an array,
+	 * a start position and an end position).
+	 * <p>
+	 * Note: the parameter <tt>stop</tt> is the <b>index</b> of the last
+	 * position, <b>not</b> the length.
+	 * <p>
+	 * Note: the search term size <b>must</b> be smaller or equal the internal
+	 * buffer size.
+	 * 
+	 * @param search
+	 *            the term to search for
+	 * @param buffer
+	 *            the buffer to look into
+	 * @param start
+	 *            the offset at which to start the search
+	 * @param stop
+	 *            the maximum index of the data to check (this is <b>not</b> a
+	 *            length, but an index)
+	 * 
+	 * @return TRUE if the search content is present at the given location and
+	 *         does not exceed the <tt>len</tt> index
+	 */
+	static public boolean startsWith(byte[] search, byte[] buffer, int start,
+			int stop) {
+
+		// Check if there even is enough space for it
+		if (search.length > (stop - start)) {
+			return false;
+		}
+
+		boolean same = true;
+		for (int i = 0; i < search.length; i++) {
+			if (search[i] != buffer[start + i]) {
+				same = false;
+				break;
+			}
+		}
+
+		return same;
+	}
+
+	/**
+	 * Return the bytes array representation of the given {@link String} in
+	 * UTF-8.
+	 * 
+	 * @param str
+	 *            the string to transform into bytes
+	 * @return the content in bytes
+	 */
+	static public byte[] bytes(String str) {
+		try {
+			return str.getBytes("UTF-8");
+		} catch (UnsupportedEncodingException e) {
+			// All conforming JVM must support UTF-8
+			e.printStackTrace();
+			return null;
+		}
+	}
+}