X-Git-Url: https://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=src%2Ftim%2Fprune%2Fload%2FByteScooper.java;fp=src%2Ftim%2Fprune%2Fload%2FByteScooper.java;h=facf1c57238857883f1d7d7f7d5c66dca40cf12c;hp=0000000000000000000000000000000000000000;hb=ce6f2161b8596f7018d6a76bff79bc9e571f35fd;hpb=2d8cb72e84d5cc1089ce77baf1e34ea3ea2f8465

diff --git a/src/tim/prune/load/ByteScooper.java b/src/tim/prune/load/ByteScooper.java
new file mode 100644
index 0000000..facf1c5
--- /dev/null
+++ b/src/tim/prune/load/ByteScooper.java
@@ -0,0 +1,52 @@
+package tim.prune.load;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * Class to scoop bytes from an input stream into an array.
+ * The size of the array doesn't have to be known in advance.
+ * This is used for getting images and sound files out of zip
+ * files or from remote URLs.
+ */
+public class ByteScooper
+{
+	/** Bucket size in bytes */
+	private static final int BUCKET_SIZE = 5000;
+	/** Amount by which barrel size is increased on demand */
+	private static final int BARREL_SIZE_INCREMENT = 100000;
+
+	/**
+	 * Scoop bytes from the given input stream and return the result
+	 * @param inIs input stream to scoop bytes from
+	 * @return byte array
+	 */
+	public static byte[] scoop(InputStream inIs) throws IOException
+	{
+		byte[] _barrel = new byte[BARREL_SIZE_INCREMENT];
+		byte[] _bucket = new byte[BUCKET_SIZE];
+		int numBytesInBarrel = 0;
+		// read from stream into the bucket
+		int numBytesRead = inIs.read(_bucket);
+		while (numBytesRead >= 0)
+		{
+			// expand barrel if necessary
+			if ((numBytesInBarrel + numBytesRead) > _barrel.length)
+			{
+				byte[] newBarrel = new byte[_barrel.length + BARREL_SIZE_INCREMENT];
+				System.arraycopy(_barrel, 0, newBarrel, 0, numBytesInBarrel);
+				_barrel = newBarrel;
+			}
+			// copy from bucket into barrel
+			System.arraycopy(_bucket, 0, _barrel, numBytesInBarrel, numBytesRead);
+			numBytesInBarrel += numBytesRead;
+			// read next lot from stream into the bucket
+			numBytesRead = inIs.read(_bucket);
+		}
+		// Now we know how many bytes there are, so crop to size
+		if (numBytesInBarrel == 0) return null;
+		byte[] result = new byte[numBytesInBarrel];
+		System.arraycopy(_barrel, 0, result, 0, numBytesInBarrel);
+		return result;
+	}
+}