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Cache the strings when reading a dex file

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This commit is contained in:
Ben Gruver
2012-12-30 13:47:04 -08:00
parent e29142d406
commit 0a9e289eb2
1 changed files with 13 additions and 6 deletions
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19
dexlib2/src/main/java/org/jf/dexlib2/dexbacked/DexBuffer.java
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@ -55,6 +55,8 @@ public class DexBuffer {
private final int classCount;
private final int classStartOffset;
@Nonnull private final String[] stringCache;
private static final byte[][] MAGIC_VALUES= new byte[][] {
new byte[]{0x64, 0x65, 0x78, 0x0a, 0x30, 0x33, 0x35, 0x00},
new byte[]{0x64, 0x65, 0x78, 0x0a, 0x30, 0x33, 0x36, 0x00}};
@ -103,7 +105,6 @@ public class DexBuffer {
public static final int TYPE_LIST_SIZE_OFFSET = 0;
public static final int TYPE_LIST_LIST_OFFSET = 4;
protected DexBuffer(@Nonnull byte[] buf, boolean bare) {
this.buf = buf;
@ -136,6 +137,7 @@ public class DexBuffer {
classCount = 0;
classStartOffset = 0;
}
stringCache = new String[stringCount];
}
public DexBuffer(@Nonnull byte[] buf) {
@ -231,11 +233,16 @@ public class DexBuffer {
@Nonnull
public String getString(int stringIndex) {
int stringOffset = getStringIdItemOffset(stringIndex);
int stringDataOffset = readSmallUint(stringOffset);
DexReader reader = readerAt(stringDataOffset);
int utf16Length = reader.readSmallUleb128();
return Utf8Utils.utf8BytesWithUtf16LengthToString(buf, reader.getOffset(), utf16Length);
String ret = stringCache[stringIndex];
if (ret == null) {
int stringOffset = getStringIdItemOffset(stringIndex);
int stringDataOffset = readSmallUint(stringOffset);
DexReader reader = readerAt(stringDataOffset);
int utf16Length = reader.readSmallUleb128();
ret = Utf8Utils.utf8BytesWithUtf16LengthToString(buf, reader.getOffset(), utf16Length);
stringCache[stringIndex] = ret;
}
return ret;
}
@Nullable