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/*
* Copyright 2012, Google LLC
*
* 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 LLC 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 com.android.tools.smali.dexlib2.dexbacked.value;
import com.android.tools.smali.dexlib2.ValueType;
import com.android.tools.smali.dexlib2.immutable.value.ImmutableBooleanEncodedValue;
import com.android.tools.smali.dexlib2.immutable.value.ImmutableByteEncodedValue;
import com.android.tools.smali.dexlib2.immutable.value.ImmutableCharEncodedValue;
import com.android.tools.smali.dexlib2.immutable.value.ImmutableDoubleEncodedValue;
import com.android.tools.smali.dexlib2.immutable.value.ImmutableFloatEncodedValue;
import com.android.tools.smali.dexlib2.immutable.value.ImmutableIntEncodedValue;
import com.android.tools.smali.dexlib2.immutable.value.ImmutableLongEncodedValue;
import com.android.tools.smali.dexlib2.immutable.value.ImmutableNullEncodedValue;
import com.android.tools.smali.dexlib2.immutable.value.ImmutableShortEncodedValue;
import com.android.tools.smali.dexlib2.util.Preconditions;
import com.android.tools.smali.util.ExceptionWithContext;
import com.android.tools.smali.dexlib2.dexbacked.DexBackedDexFile;
import com.android.tools.smali.dexlib2.dexbacked.DexReader;
import com.android.tools.smali.dexlib2.iface.value.EncodedValue;
import javax.annotation.Nonnull;
public abstract class DexBackedEncodedValue {
@Nonnull
public static EncodedValue readFrom(@Nonnull DexBackedDexFile dexFile, @Nonnull DexReader reader) {
int startOffset = reader.getOffset();
try {
int b = reader.readUbyte();
int valueType = b & 0x1f;
int valueArg = b >>> 5;
switch (valueType) {
case ValueType.BYTE:
Preconditions.checkValueArg(valueArg, 0);
return new ImmutableByteEncodedValue((byte)reader.readByte());
case ValueType.SHORT:
Preconditions.checkValueArg(valueArg, 1);
return new ImmutableShortEncodedValue((short)reader.readSizedInt(valueArg + 1));
case ValueType.CHAR:
Preconditions.checkValueArg(valueArg, 1);
return new ImmutableCharEncodedValue((char)reader.readSizedSmallUint(valueArg + 1));
case ValueType.INT:
Preconditions.checkValueArg(valueArg, 3);
return new ImmutableIntEncodedValue(reader.readSizedInt(valueArg + 1));
case ValueType.LONG:
Preconditions.checkValueArg(valueArg, 7);
return new ImmutableLongEncodedValue(reader.readSizedLong(valueArg + 1));
case ValueType.FLOAT:
Preconditions.checkValueArg(valueArg, 3);
return new ImmutableFloatEncodedValue(Float.intBitsToFloat(
reader.readSizedRightExtendedInt(valueArg + 1)));
case ValueType.DOUBLE:
Preconditions.checkValueArg(valueArg, 7);
return new ImmutableDoubleEncodedValue(Double.longBitsToDouble(
reader.readSizedRightExtendedLong(valueArg + 1)));
case ValueType.STRING:
Preconditions.checkValueArg(valueArg, 3);
return new DexBackedStringEncodedValue(dexFile, reader, valueArg);
case ValueType.TYPE:
Preconditions.checkValueArg(valueArg, 3);
return new DexBackedTypeEncodedValue(dexFile, reader, valueArg);
case ValueType.FIELD:
Preconditions.checkValueArg(valueArg, 3);
return new DexBackedFieldEncodedValue(dexFile, reader, valueArg);
case ValueType.METHOD:
Preconditions.checkValueArg(valueArg, 3);
return new DexBackedMethodEncodedValue(dexFile, reader, valueArg);
case ValueType.ENUM:
Preconditions.checkValueArg(valueArg, 3);
return new DexBackedEnumEncodedValue(dexFile, reader, valueArg);
case ValueType.ARRAY:
Preconditions.checkValueArg(valueArg, 0);
return new DexBackedArrayEncodedValue(dexFile, reader);
case ValueType.ANNOTATION:
Preconditions.checkValueArg(valueArg, 0);
return new DexBackedAnnotationEncodedValue(dexFile, reader);
case ValueType.NULL:
Preconditions.checkValueArg(valueArg, 0);
return ImmutableNullEncodedValue.INSTANCE;
case ValueType.BOOLEAN:
Preconditions.checkValueArg(valueArg, 1);
return ImmutableBooleanEncodedValue.forBoolean(valueArg == 1);
case ValueType.METHOD_HANDLE:
Preconditions.checkValueArg(valueArg, 3);
return new DexBackedMethodHandleEncodedValue(dexFile, reader, valueArg);
case ValueType.METHOD_TYPE:
Preconditions.checkValueArg(valueArg, 3);
return new DexBackedMethodTypeEncodedValue(dexFile, reader, valueArg);
default:
throw new ExceptionWithContext("Invalid encoded_value type: 0x%x", valueType);
}
} catch (Exception ex) {
throw ExceptionWithContext.withContext(ex, "Error while reading encoded value at offset 0x%x", startOffset);
}
}
public static void skipFrom(@Nonnull DexReader reader) {
int startOffset = reader.getOffset();
try {
int b = reader.readUbyte();
int valueType = b & 0x1f;
switch (valueType) {
case ValueType.BYTE:
reader.skipByte();
break;
case ValueType.SHORT:
case ValueType.CHAR:
case ValueType.INT:
case ValueType.LONG:
case ValueType.FLOAT:
case ValueType.DOUBLE:
case ValueType.STRING:
case ValueType.TYPE:
case ValueType.FIELD:
case ValueType.METHOD:
case ValueType.ENUM:
case ValueType.METHOD_HANDLE:
case ValueType.METHOD_TYPE:
int valueArg = b >>> 5;
reader.moveRelative(valueArg+1);
break;
case ValueType.ARRAY:
DexBackedArrayEncodedValue.skipFrom(reader);
break;
case ValueType.ANNOTATION:
DexBackedAnnotationEncodedValue.skipFrom(reader);
break;
case ValueType.NULL:
case ValueType.BOOLEAN:
break;
default:
throw new ExceptionWithContext("Invalid encoded_value type: 0x%x", valueType);
}
} catch (Exception ex) {
throw ExceptionWithContext.withContext(ex, "Error while skipping encoded value at offset 0x%x",
startOffset);
}
}
}
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