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/* ____ ____ ____ ____ ______ *\
** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala **
** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, LAMP/EPFL **
** /_____/\____/\___/\____/____/ **
** **
** $Id$
\* */
package scalac.util;
import java.io.IOException;
import scala.tools.util.AbstractFile;
public class AbstractFileReader {
/** the buffer containing the file
*/
public byte[] buf;
/** the current input pointer
*/
public int bp;
/** the file path name
*/
public final String path;
/** constructor
*/
public AbstractFileReader(AbstractFile f) throws IOException {
buf = f.read();
bp = 0;
path = f.getPath();
}
/** 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 mybp) {
return (char)(((buf[mybp] & 0xff) << 8) + (buf[mybp+1] & 0xff));
}
/** extract an integer at position bp from buf
*/
public int getInt(int mybp) {
return ((buf[mybp ] & 0xff) << 24) +
((buf[mybp+1] & 0xff) << 16) +
((buf[mybp+2] & 0xff) << 8) +
(buf[mybp+3] & 0xff);
}
/** extract a long integer at position bp from buf
*/
public long getLong(int mybp) {
return ((long)(getInt(mybp)) << 32) + (getInt(mybp + 4) & 0xffffffffL);
}
/** extract a float at position bp from buf
*/
public strictfp float getFloat(int mybp) {
return Float.intBitsToFloat(getInt(mybp));
}
/** extract a double at position bp from buf
*/
public strictfp double getDouble(int mybp) {
return Double.longBitsToDouble(getLong(mybp));
}
/** skip next 'n' bytes
*/
public void skip(int n) {
bp += n;
}
}
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