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Add support for constructing a DexBackedDexFile from a DexBuffer

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This commit is contained in:
Huaxin Li 2020-01-09 16:00:22 -08:00 committed by Ben Gruver
parent bf65e575a0
commit b7a1052c66
1 changed files with 29 additions and 0 deletions
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29
dexlib2/src/main/java/org/jf/dexlib2/dexbacked/DexBackedDexFile.java
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@ -98,6 +98,35 @@ public class DexBackedDexFile implements DexFile {
mapOffset = dexBuffer.readSmallUint(HeaderItem.MAP_OFFSET); mapOffset = dexBuffer.readSmallUint(HeaderItem.MAP_OFFSET);
} }
protected DexBackedDexFile(@Nullable Opcodes opcodes, @Nonnull DexBuffer dexBuffer, @Nonnull DexBuffer dataBuffer, int offset, boolean verifyMagic) {
this.dexBuffer = dexBuffer;
this.dataBuffer = dataBuffer;
byte[] headerBuf = dexBuffer.readByteRange(offset, /* lengthOfHeader= */ 112);
int dexVersion = getVersion(headerBuf, offset, verifyMagic);
if (opcodes == null) {
this.opcodes = getDefaultOpcodes(dexVersion);
} else {
this.opcodes = opcodes;
}
stringCount = dexBuffer.readSmallUint(HeaderItem.STRING_COUNT_OFFSET);
stringStartOffset = dexBuffer.readSmallUint(HeaderItem.STRING_START_OFFSET);
typeCount = dexBuffer.readSmallUint(HeaderItem.TYPE_COUNT_OFFSET);
typeStartOffset = dexBuffer.readSmallUint(HeaderItem.TYPE_START_OFFSET);
protoCount = dexBuffer.readSmallUint(HeaderItem.PROTO_COUNT_OFFSET);
protoStartOffset = dexBuffer.readSmallUint(HeaderItem.PROTO_START_OFFSET);
fieldCount = dexBuffer.readSmallUint(HeaderItem.FIELD_COUNT_OFFSET);
fieldStartOffset = dexBuffer.readSmallUint(HeaderItem.FIELD_START_OFFSET);
methodCount = dexBuffer.readSmallUint(HeaderItem.METHOD_COUNT_OFFSET);
methodStartOffset = dexBuffer.readSmallUint(HeaderItem.METHOD_START_OFFSET);
classCount = dexBuffer.readSmallUint(HeaderItem.CLASS_COUNT_OFFSET);
classStartOffset = dexBuffer.readSmallUint(HeaderItem.CLASS_START_OFFSET);
mapOffset = dexBuffer.readSmallUint(HeaderItem.MAP_OFFSET);
}
/** /**
* @return The offset that various data offsets are relative to. This is always 0 for a dex file, but may be * @return The offset that various data offsets are relative to. This is always 0 for a dex file, but may be
* different for other related formats (e.g. cdex). * different for other related formats (e.g. cdex).