Fix javac --incremental by using jmake for dependency analysis

third_party/jmake/src/org/pantsbuild/jmake/BinaryFileWriter.java

+/* Copyright (c) 2002-2008 Sun Microsystems, Inc. All rights reserved
+ *
+ * This program is distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+package org.pantsbuild.jmake;
+
+/**
+ * Basic operations for writing to a byte array representing a binary file.
+ *
+ * @author  Misha Dmitriev
+ *  30 January 2002
+ */
+public class BinaryFileWriter {
+
+    protected byte[] buf;
+    protected int curBufSize,  bufInc,  curBufPos,  threshold;
+    private boolean bufferIncreaseAllowed = true;
+
+    protected void initBuf(int initSize) {
+        buf = new byte[initSize];
+        curBufSize = initSize;
+        bufInc = initSize / 5;
+        curBufPos = 0;
+        threshold = curBufSize - bufInc;
+    }
+
+    protected void increaseBuf() {
+        if (!bufferIncreaseAllowed) {
+            return;
+        }
+        byte newBuf[] = new byte[curBufSize + bufInc];
+        System.arraycopy(buf, 0, newBuf, 0, curBufPos);
+        buf = newBuf;
+        curBufSize = buf.length;
+        threshold = curBufSize - bufInc;
+    }
+
+    // This should be called with false only when we are sure that we set the exact size of the buffer
+    // and there is no need to increase it.
+    protected void setBufferIncreaseMode(boolean increaseMode) {
+        bufferIncreaseAllowed = increaseMode;
+    }
+
+    public byte[] getBuffer() {
+        return buf;
+    }
+
+
+    protected void writeByte(byte b) {
+        if (curBufPos > threshold) {
+            increaseBuf();
+        }
+        buf[curBufPos++] = b;
+    }
+
+    protected void writeChar(int ch) {
+        buf[curBufPos++] = (byte) ((ch >> 8) & 255);
+        buf[curBufPos++] = (byte) (ch & 255);
+        if (curBufPos > threshold) {
+            increaseBuf();
+        }
+    }
+
+    protected void writeInt(int i) {
+        buf[curBufPos++] = (byte) ((i >> 24) & 255);
+        buf[curBufPos++] = (byte) ((i >> 16) & 255);
+        buf[curBufPos++] = (byte) ((i >> 8) & 255);
+        buf[curBufPos++] = (byte) (i & 255);
+        if (curBufPos > threshold) {
+            increaseBuf();
+        }
+    }
+
+    protected void writeLong(long l) {
+        buf[curBufPos++] = (byte) ((l >> 56) & 255);
+        buf[curBufPos++] = (byte) ((l >> 48) & 255);
+        buf[curBufPos++] = (byte) ((l >> 40) & 255);
+        buf[curBufPos++] = (byte) ((l >> 32) & 255);
+        buf[curBufPos++] = (byte) ((l >> 24) & 255);
+        buf[curBufPos++] = (byte) ((l >> 16) & 255);
+        buf[curBufPos++] = (byte) ((l >> 8) & 255);
+        buf[curBufPos++] = (byte) (l & 255);
+        if (curBufPos > threshold) {
+            increaseBuf();
+        }
+    }
+
+    protected void writeFloat(float f) {
+        int i = Float.floatToIntBits(f);
+        writeInt(i);
+    }
+
+    protected void writeDouble(double d) {
+        long l = Double.doubleToLongBits(d);
+        writeLong(l);
+    }
+}