写一个java方法从APK签名分块中找到键值对长度、key的长度固定4个字节、value的长度
下面是一个Java方法,用于从APK签名分块中提取键值对的长度、key的长度和value的长度:
import java.io.FileInputStream;
import java.io.IOException;
public class ApkSignatureParser {
public static void main(String[] args) {
String apkPath = "path/to/apk/file.apk";
parseApkSignature(apkPath);
}
public static void parseApkSignature(String apkPath) {
try (FileInputStream fis = new FileInputStream(apkPath)) {
byte[] buffer = new byte[4];
int bytesRead = fis.read(buffer);
while (bytesRead != -1) {
int entryLength = byteArrayToInt(buffer);
System.out.println("Entry Length: " + entryLength);
bytesRead = fis.read(buffer);
if (bytesRead == -1) {
break;
}
int keyLength = byteArrayToInt(buffer);
System.out.println("Key Length: " + keyLength);
bytesRead = fis.read(buffer);
if (bytesRead == -1) {
break;
}
int valueLength = byteArrayToInt(buffer);
System.out.println("Value Length: " + valueLength);
// Skip to the next entry
long skipped = fis.skip(entryLength - 4 - keyLength - valueLength);
if (skipped != entryLength - 4 - keyLength - valueLength) {
throw new IOException("Error skipping to next entry.");
}
bytesRead = fis.read(buffer);
}
} catch (IOException e) {
e.printStackTrace();
}
}
private static int byteArrayToInt(byte[] bytes) {
int value = 0;
for (int i = 0; i < bytes.length; i++) {
value |= (bytes[i] & 0xFF) << (8 * (bytes.length - 1 - i));
}
return value;
}
}
请将 "path/to/apk/file.apk" 替换为你要解析的APK文件的实际路径。该方法使用FileInputStream从APK文件中读取字节,并将其转换为整数值。首先读取4个字节,以获取键值对的长度。然后再读取4个字节来获取key的长度,最后再读取4个字节来获取value的长度。然后,可以根据需要处理这些值。
请注意,该方法假设APK签名分块的格式是按照上述规定的长度进行编码的。如果APK签名分块的格式不符合该规定,可能需要进行相应的修改
原文地址: https://www.cveoy.top/t/topic/hLpo 著作权归作者所有。请勿转载和采集!