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Merge "Tweak buffer size for APK checksumming."

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This commit is contained in:
Alex Buynytskyy
2021-08-30 18:23:08 +00:00
committed by Android (Google) Code Review
parent b38ce845a2 e7e43738df
commit ab1d302c75
1 changed files with 9 additions and 6 deletions
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15
services/core/java/com/android/server/pm/ApkChecksums.java
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@@ -64,7 +64,6 @@ import com.android.internal.annotations.VisibleForTesting;
import com.android.internal.security.VerityUtils;
import com.android.server.pm.parsing.pkg.AndroidPackage;
import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
@@ -724,16 +723,20 @@ public class ApkChecksums {
}
}
static final int MIN_BUFFER_SIZE = 4 * 1024;
static final int MAX_BUFFER_SIZE = 128 * 1024;
private static byte[] getApkChecksum(File file, int type) {
try (FileInputStream fis = new FileInputStream(file);
BufferedInputStream bis = new BufferedInputStream(fis)) {
byte[] dataBytes = new byte[512 * 1024];
final int bufferSize = (int) Math.max(MIN_BUFFER_SIZE,
Math.min(MAX_BUFFER_SIZE, file.length()));
try (FileInputStream fis = new FileInputStream(file)) {
final byte[] buffer = new byte[bufferSize];
int nread = 0;
final String algo = getMessageDigestAlgoForChecksumKind(type);
MessageDigest md = MessageDigest.getInstance(algo);
while ((nread = bis.read(dataBytes)) != -1) {
md.update(dataBytes, 0, nread);
while ((nread = fis.read(buffer)) != -1) {
md.update(buffer, 0, nread);
}
return md.digest();