Moved source into separate src directory due to popular request

[GpsPrune.git] / src / tim / prune / save / xml / ByteBuffer.java

diff --git a/src/tim/prune/save/xml/ByteBuffer.java b/src/tim/prune/save/xml/ByteBuffer.java
new file mode 100644 (file)
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;
+       }
+}