| /* |
| * 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; |
| /* package private */ final int baseOffset; |
| |
| public BaseDexBuffer(@Nonnull byte[] buf) { |
| this(buf, 0); |
| } |
| public BaseDexBuffer(@Nonnull byte[] buf, int offset) { |
| this.buf = buf; |
| this.baseOffset = offset; |
| } |
| |
| public int readSmallUint(int offset) { |
| byte[] buf = this.buf; |
| offset += baseOffset; |
| 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; |
| offset += baseOffset; |
| 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; |
| offset += baseOffset; |
| return (buf[offset] & 0xff) | |
| ((buf[offset+1] & 0xff) << 8); |
| } |
| |
| public int readUbyte(int offset) { |
| return buf[offset + baseOffset] & 0xff; |
| } |
| |
| public long readLong(int offset) { |
| byte[] buf = this.buf; |
| offset += baseOffset; |
| 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 readLongAsSmallUint(int offset) { |
| byte[] buf = this.buf; |
| offset += baseOffset; |
| long result = (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); |
| if (result < 0 || result > Integer.MAX_VALUE) { |
| throw new ExceptionWithContext("Encountered out-of-range ulong at offset 0x%x", offset); |
| } |
| return (int)result; |
| } |
| |
| public int readInt(int offset) { |
| byte[] buf = this.buf; |
| offset += baseOffset; |
| 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; |
| offset += baseOffset; |
| return (buf[offset] & 0xff) | |
| (buf[offset+1] << 8); |
| } |
| |
| public int readByte(int offset) { |
| return buf[baseOffset + offset]; |
| } |
| |
| @Nonnull |
| public BaseDexReader readerAt(int offset) { |
| return new BaseDexReader<BaseDexBuffer>(this, offset); |
| } |
| |
| @Nonnull |
| protected byte[] getBuf() { |
| return buf; |
| } |
| |
| protected int getBaseOffset() { |
| return baseOffset; |
| } |
| } |