85 lines
2.7 KiB
Java
85 lines
2.7 KiB
Java
/* ###
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* IP: GHIDRA
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* REVIEWED: YES
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// This script condenses a sequence of equal bytes into a byte array. Starts at the current address and
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// looks for bytes equal to the byte at that address in sequence until it encounters a different byte
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// value
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// does not condense into new memory blocks
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// does not overwrite previously defined code or memory
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//@category Analysis
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import ghidra.app.script.GhidraScript;
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import ghidra.program.model.address.Address;
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import ghidra.program.model.data.AlignmentDataType;
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import ghidra.program.model.listing.Listing;
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import ghidra.program.model.mem.MemoryBlock;
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/**
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* condenses sequence of equal bytes, starting at current byte, into an array of bytes
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*/
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public class CondenseRepeatingBytes extends GhidraScript {
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@Override
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public void run() throws Exception {
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if (currentAddress == null) {
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println("No Location.");
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return;
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}
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MemoryBlock currentMemoryBlock = currentProgram.getMemory().getBlock(currentAddress);
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if(!currentMemoryBlock.isInitialized()){
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println("Script cannot run in uninitialized memory.");
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return;
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}
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Listing listing = currentProgram.getListing();
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Address currentAddr = currentAddress;
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byte repeatingByte = currentProgram.getMemory().getByte(currentAddr);
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int repeatLen = 1;
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currentAddr = currentAddr.addNoWrap(1);
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byte nextByte;
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boolean sameMemoryBlock;
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if(currentProgram.getMemory().getBlock(currentAddr).equals(currentMemoryBlock)) {
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nextByte = currentProgram.getMemory().getByte(currentAddr);
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sameMemoryBlock = true;
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}
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else{
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sameMemoryBlock = false;
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return;
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}
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boolean noCollisions = true;
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while((sameMemoryBlock) && (nextByte == repeatingByte) && (noCollisions)){
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repeatLen++;
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currentAddr = currentAddr.addNoWrap(1);
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if(currentProgram.getMemory().getBlock(currentAddr) != currentMemoryBlock){
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sameMemoryBlock = false;
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}
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else{
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nextByte = currentProgram.getMemory().getByte(currentAddr);
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noCollisions = listing.isUndefined(currentAddr,currentAddr);
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}
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}
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listing.createData(currentAddress, new AlignmentDataType(), repeatLen);
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println("Applied Alignment datatype at " + currentAddress.toString());
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}
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}
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