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Skips unknown bytes if mismatch occurs after reading Configurations

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- fixes #1131
This commit is contained in:
Connor Tumbleson 2016-04-29 09:13:16 -04:00
parent 3e566930c7
commit ba62238843
1 changed files with 23 additions and 10 deletions
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33
brut.apktool/apktool-lib/src/main/java/brut/androlib/res/decoder/ARSCDecoder.java
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@ -54,11 +54,10 @@ public class ARSCDecoder {
}
private ARSCDecoder(InputStream arscStream, ResTable resTable, boolean storeFlagsOffsets, boolean keepBroken) {
arscStream = mCountIn = new CountingInputStream(arscStream);
if (storeFlagsOffsets) {
arscStream = mCountIn = new CountingInputStream(arscStream);
mFlagsOffsets = new ArrayList<FlagsOffset>();
} else {
mCountIn = null;
mFlagsOffsets = null;
}
mIn = new ExtDataInput(new LittleEndianDataInputStream(arscStream));
@ -186,12 +185,18 @@ public class ARSCDecoder {
/* res0, res1 */mIn.skipBytes(3);
int entryCount = mIn.readInt();
/* entriesStart */mIn.skipInt();
int entriesStart = mIn.readInt();
mMissingResSpecs = new boolean[entryCount];
Arrays.fill(mMissingResSpecs, true);
ResConfigFlags flags = readConfigFlags();
int position = (mHeader.startPosition + entriesStart) - (entryCount * 4);
// For some APKs there is a disconnect between the reported size of Configs
// If we find a mismatch skip those bytes.
if (position != mCountIn.getCount()) {
mIn.skipBytes(position - mCountIn.getCount());
}
int[] entryOffsets = mIn.readIntArray(entryCount);
if (flags.isInvalid) {
@ -217,7 +222,10 @@ public class ARSCDecoder {
}
private void readEntry() throws IOException, AndrolibException {
/* size */mIn.skipBytes(2);
short size = mIn.readShort();
if (size < 0) {
throw new AndrolibException("Entry size is under 0 bytes.");
}
short flags = mIn.readShort();
int specNamesId = mIn.readInt();
@ -464,7 +472,7 @@ public class ARSCDecoder {
}
private Header nextChunk() throws IOException {
return mHeader = Header.read(mIn);
return mHeader = Header.read(mIn, mCountIn);
}
private void checkChunkType(int expectedType) throws AndrolibException {
@ -502,21 +510,26 @@ public class ARSCDecoder {
public final short type;
public final int headerSize;
public final int chunkSize;
public final int startPosition;
public final int endPosition;
public Header(short type, int headerSize, int chunkSize) {
public Header(short type, int headerSize, int chunkSize, int headerStart) {
this.type = type;
this.headerSize = headerSize;
this.chunkSize = chunkSize;
this.startPosition = headerStart;
this.endPosition = headerStart + chunkSize;
}
public static Header read(ExtDataInput in) throws IOException {
public static Header read(ExtDataInput in, CountingInputStream countIn) throws IOException {
short type;
int start = countIn.getCount();
try {
type = in.readShort();
} catch (EOFException ex) {
return new Header(TYPE_NONE, 0, 0);
return new Header(TYPE_NONE, 0, 0, countIn.getCount());
}
return new Header(type, in.readShort(), in.readInt());
return new Header(type, in.readShort(), in.readInt(), start);
}
public final static short TYPE_NONE = -1, TYPE_TABLE = 0x0002,