+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;
+ }
+}
projects / GpsPrune.git / commitdiff
