/*
* Copyright 2012, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.jf.dexlib2.dexbacked;
import org.jf.util.ExceptionWithContext;
import javax.annotation.Nonnull;
public class BaseDexBuffer {
@Nonnull /* package private */ final byte[] buf;
public BaseDexBuffer(@Nonnull byte[] buf) {
this.buf = buf;
}
public int readSmallUint(int offset) {
byte[] buf = this.buf;
int result = (buf[offset] & 0xff) |
((buf[offset+1] & 0xff) << 8) |
((buf[offset+2] & 0xff) << 16) |
((buf[offset+3]) << 24);
if (result < 0) {
throw new ExceptionWithContext("Encountered small uint that is out of range at offset 0x%x", offset);
}
return result;
}
public int readOptionalUint(int offset) {
byte[] buf = this.buf;
int result = (buf[offset] & 0xff) |
((buf[offset+1] & 0xff) << 8) |
((buf[offset+2] & 0xff) << 16) |
((buf[offset+3]) << 24);
if (result < -1) {
throw new ExceptionWithContext("Encountered optional uint that is out of range at offset 0x%x", offset);
}
return result;
}
public int readUshort(int offset) {
byte[] buf = this.buf;
return (buf[offset] & 0xff) |
((buf[offset+1] & 0xff) << 8);
}
public int readUbyte(int offset) {
return buf[offset] & 0xff;
}
public long readLong(int offset) {
byte[] buf = this.buf;
return (buf[offset] & 0xff) |
((buf[offset+1] & 0xff) << 8) |
((buf[offset+2] & 0xff) << 16) |
((buf[offset+3] & 0xffL) << 24) |
((buf[offset+4] & 0xffL) << 32) |
((buf[offset+5] & 0xffL) << 40) |
((buf[offset+6] & 0xffL) << 48) |
(((long)buf[offset+7]) << 56);
}
public int readInt(int offset) {
byte[] buf = this.buf;
return (buf[offset] & 0xff) |
((buf[offset+1] & 0xff) << 8) |
((buf[offset+2] & 0xff) << 16) |
(buf[offset+3] << 24);
}
public int readShort(int offset) {
byte[] buf = this.buf;
return (buf[offset] & 0xff) |
(buf[offset+1] << 8);
}
public int readByte(int offset) {
return buf[offset];
}
@Nonnull
public BaseDexReader readerAt(int offset) {
return new BaseDexReader<BaseDexBuffer>(this, offset);
}
@Nonnull
protected byte[] getBuf() {
return buf;
}
}