[英]Decompressing byte array in java
While decompressing adhaar qr code sample data steps follow as given https://uidai.gov.in/images/resource/User_manulal_QR_Code_15032019.pdf , I got java.util.zip.DataFormatException: incorrect header check error while decompressing the byte array
在解压缩 adhaar qr 代码示例数据步骤时,按照给定的https://uidai.gov.in/images/resource/User_manulal_QR_Code_15032019.pdf ,我得到了
java.util.zip.DataFormatException: incorrect header check error while decompressing the byte array
// getting aadhaar sample qr code data from
// https://uidai.gov.in/images/resource/User_manulal_QR_Code_15032019.pdf
String s ="taking here Aadhaar sample qr code data";
BigInteger bi = new BigInteger(s, 10);
byte[] array = bi.toByteArray();
Inflater decompresser = new Inflater(true);
decompresser.setInput(array);
ByteArrayOutputStream outputStream = new
ByteArrayOutputStream(array.length);
byte[] buffer = new byte[1024];
while (!decompresser.finished()) {
int count = decompresser.inflate(buffer);
outputStream.write(buffer, 0, count);
}
outputStream.close();
byte[] output = outputStream.toByteArray();
String st = new String(output, 0, 255, "ISO-8859-1");
System.out.println("==========="+st);
The problem is that you are using Inflater class of java which uses Zlib compression algorithm.问题是您使用的是使用 Zlib 压缩算法的 Java 的 Inflater 类。 However in UIDAI secure QR code, GZip compression algorithm is being used.
但是在UIDAI安全二维码中,使用了GZip压缩算法。 So the decompression logic has to be modified as following:-
所以解压逻辑必须修改如下:-
ByteArrayOutputStream os = new ByteArrayOutputStream();
try {
ByteArrayInputStream in = new ByteArrayInputStream(data);
GZIPInputStream gis = new GZIPInputStream(in);
byte[] buffer = new byte[1024];
int len;
while((len = gis.read(buffer)) != -1){ os.write(buffer, 0, len);
}
os.close();
gis.close();
}
catch (IOException e) {
e.printStackTrace();
return null;
}
byte[] output = os.toByteArray();
This is the project which decoded the data Correctly: https://github.com/dimagi/AadharUID这是正确解码数据的项目: https : //github.com/dimagi/AadharUID
It supports secure, xml and uid_number type它支持安全、xml 和 uid_number 类型
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