X-Git-Url: http://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=src%2Ftim%2Fprune%2Fsave%2Fxml%2FByteBuffer.java;fp=src%2Ftim%2Fprune%2Fsave%2Fxml%2FByteBuffer.java;h=67091e1c9a8d3385635ef86ee1a8a14be801fc64;hp=0000000000000000000000000000000000000000;hb=ce6f2161b8596f7018d6a76bff79bc9e571f35fd;hpb=2d8cb72e84d5cc1089ce77baf1e34ea3ea2f8465

diff --git a/src/tim/prune/save/xml/ByteBuffer.java b/src/tim/prune/save/xml/ByteBuffer.java
new file mode 100644
index 0000000..67091e1
--- /dev/null
+++ b/src/tim/prune/save/xml/ByteBuffer.java
@@ -0,0 +1,88 @@
+package tim.prune.save.xml;
+
+import java.nio.charset.Charset;
+
+/**
+ * Class to collect the bytes from an input stream
+ * and turn them into a String
+ */
+public class ByteBuffer
+{
+	// Array of bytes
+	private byte[] _bytes = new byte[1024];
+	// Current position to append
+	private int _currPos = 0;
+	// Flag for recognising utf8 encoded streams
+	private boolean _streamUtf8 = false;
+	// Flag for whether system is utf8 or not
+	private final boolean _systemUtf8 = XmlUtils.isSystemUtf8();
+
+	/**
+	 * Append the given byte to the buffer
+	 * @param inB byte to append
+	 */
+	public void appendByte(byte inB)
+	{
+		// Resize array if necessary
+		if (_currPos >= _bytes.length)
+		{
+			byte[] bigger = new byte[_bytes.length * 2];
+			System.arraycopy(_bytes, 0, bigger, 0, _bytes.length);
+			_bytes = bigger;
+		}
+		// Append byte and increment counter
+		_bytes[_currPos] = inB;
+		_currPos++;
+	}
+
+	/**
+	 * Clear the buffer and reset
+	 */
+	public void clear()
+	{
+		_currPos = 0;
+		// Reduce size back to default if it's got too big
+		if (_bytes.length > 5000) {
+			_bytes = new byte[1024];
+		}
+	}
+
+	/**
+	 * Set the flag that this stream is encoded with utf8
+	 */
+	public void setEncodingUtf8() {
+		_streamUtf8 = true;
+	}
+
+	/**
+	 * @return contents of buffer as a String
+	 */
+	public String toString()
+	{
+		// Sometimes the encoding of the read file isn't the default encoding of the system
+		if (_streamUtf8 && !_systemUtf8)
+		{
+			return new String(_bytes, 0, _currPos, Charset.forName("UTF-8"));
+		}
+		// Otherwise just use system encoding
+		return new String(_bytes, 0, _currPos);
+	}
+
+	/**
+	 * Look for the given character sequence in the last characters read
+	 * @param inChars sequence to look for
+	 * @return true if sequence found
+	 */
+	public boolean foundSequence(char[] inChars)
+	{
+		final int numChars = inChars.length;
+		if (_currPos < numChars) {return false;}
+		for (int i=0; i<numChars; i++)
+		{
+			char searchChar = inChars[numChars - 1 - i];
+			char sourceChar = (char) _bytes[_currPos - 1 - i];
+			if (searchChar != sourceChar) {return false;}
+		}
+		return true;
+	}
+}