How to decrypt a json response with gzip encoded data in flutter? - json

Question

The Json response has encrypted objects which has to be decrypted to get the actual process. In android GZip was used .How can I achieve this The sample Json is as mentioned below.Any help is really appreciated.
{
"Data": "1.´ABCD´1150275,11028´01-Jan-2021´8,000.00´",
"Data": [
{
"Element": "8iMAAB+LCAAAAAAABADt1T8zBxwHgkefKcGh98Zcdz8FSqj9DMzK4d+L0Nj1tveNR2w6M8rRs3PJWBFDy"
},
{
"Element": "B1AV4bGp6JzQJI8ChnxzixrlT8vKnYHPwRM8zykKVn2gkceAFdxMwU0to"
}
],
"Status": 1,
"Msg": "Success",
"APIVersion": "1.4"
}
Basically how to decrypt a Gzip string. The same process was done in android ,but im new to flutter
Android java code is attached. i want to achieve something like that in flutter
public static String decompress(String zipText) throws IOException {
byte[] compressed = Base64.decode(zipText, Base64.DEFAULT);
if (compressed.length > 4) {
GZIPInputStream gzipInputStream = new GZIPInputStream(new ByteArrayInputStream(compressed, 4,compressed.length - 4));
ByteArrayOutputStream baos = new ByteArrayOutputStream();
for (int value = 0; value != -1; ) {
value = gzipInputStream.read();
if (value != -1) {
baos.write(value);
}
}
gzipInputStream.close();
baos.close();
return new String(baos.toByteArray(), StandardCharsets.UTF_8);
} else {
return "";
}
}
On way i tried was
List<int> data = utf8.encode(zipText);
var deCompressedString = GZipDecoder().decodeBytes(data);
print(deCompressedString);
Which throw exception
Unhandled Exception: FormatException: Invalid GZip Signature

Answer 1

For decrypt zipped: How to decode a Gzip Http Response in Flutter?
EDIT
decompress like this
String decompress(String zipText) {
final List<int> compressed = base64Decode(zipText);
if (compressed.length > 4) {
Uint8List uint8list = GZipDecoder().decodeBytes(compressed.sublist(4, compressed.length - 4));
// print( String.fromCharCodes(uint8list));
return String.fromCharCodes(uint8list);
} else {
return "";
}
}