Initial version.

1 files changed, 107 insertions, 0 deletions

diff --git a/sources/scalac/util/AbstractFileReader.java b/sources/scalac/util/AbstractFileReader.java
new file mode 100644
index 0000000000..0d18292838
--- /dev/null
+++ b/sources/scalac/util/AbstractFileReader.java
@@ -0,0 +1,107 @@
+/*     ____ ____  ____ ____  ______                                     *\
+**    / __// __ \/ __// __ \/ ____/    SOcos COmpiles Scala             **
+**  __\_ \/ /_/ / /__/ /_/ /\_ \       (c) 2002, LAMP/EPFL              **
+** /_____/\____/\___/\____/____/                                        **
+**                                                                      **
+** $Id$
+\*                                                                      */
+
+package scalac.util;
+
+import java.io.*;
+
+
+public class AbstractFileReader {
+
+    /** the buffer containing the file
+     */
+    public byte[] buf;
+
+    /** the current input pointer
+     */
+    public int bp;
+
+    /** constructor
+     */
+    public AbstractFileReader(AbstractFile f) throws IOException {
+        buf = f.read();
+        bp = 0;
+    }
+
+    /** return byte at offset 'pos'
+     */
+    public byte byteAt(int pos) {
+        return buf[pos];
+    }
+
+    /** read a byte
+     */
+    public byte nextByte() {
+        return buf[bp++];
+    }
+
+    /** read some bytes
+     */
+    public byte[] nextBytes(int len) {
+        byte[] res = new byte[len];
+        System.arraycopy(buf, bp, res, 0, len);
+        bp += len;
+        return res;
+    }
+
+    /** read a character
+     */
+    public char nextChar() {
+        return
+            (char)(((buf[bp++] & 0xff) << 8) +
+                    (buf[bp++] & 0xff));
+    }
+
+    /** read an integer
+     */
+    public int nextInt() {
+        return  ((buf[bp++] & 0xff) << 24) +
+                ((buf[bp++] & 0xff) << 16) +
+                ((buf[bp++] & 0xff) <<  8) +
+                (buf[bp++] & 0xff);
+    }
+
+    /** extract a character at position bp from buf
+     */
+    public char getChar(int bp) {
+        return (char)(((buf[bp] & 0xff) << 8) + (buf[bp+1] & 0xff));
+    }
+
+    /** extract an integer at position bp from buf
+     */
+    public int getInt(int bp) {
+        return  ((buf[bp  ] & 0xff) << 24) +
+                ((buf[bp+1] & 0xff) << 16) +
+                ((buf[bp+2] & 0xff) << 8) +
+                 (buf[bp+3] & 0xff);
+    }
+
+    /** extract a long integer at position bp from buf
+     */
+    public long getLong(int bp) {
+        return ((long)(getInt(bp)) << 32) + (getInt(bp + 4) & 0xffffffffL);
+    }
+
+    /** extract a float at position bp from buf
+     */
+    public strictfp float getFloat(int bp) {
+        return Float.intBitsToFloat(getInt(bp));
+    }
+
+    /** extract a double at position bp from buf
+     */
+    public strictfp double getDouble(int bp) {
+        return Double.longBitsToDouble(getLong(bp));
+    }
+
+   /** skip next 'n' bytes
+    */
+    public void skip(int n) {
+        bp += n;
+    }
+}