JNI function returning illegal UTF characters at android - c

Question

Im trying to return string from JNI to android but its returning illegal UTF characters like this:
JNI DETECTED ERROR IN APPLICATION: input is not valid Modified UTF-8:
illegal start byte 0x80
04-12 16:08:09.899 18210-18372 A/art:art/runtime/runtime.cc:427]
string: '���� ���!��"��,"���"���#���$��%���
%��`&��'��H(���)��D*���*��X+��,���,���-��4.��|.��P/��t/���/��01��x1��
2��D2���2���3���4���5��06���6��9���9��;���;��H<��=��0=���=���>��8?��
Here is the code which I am using:
JNIEXPORT jbyteArray Java_pakdata_com_qurantextc_MainActivity_get(
JNIEnv *pEnv,
jobject this,
jint pageNo, jint lang) {
char* buffer=(char*)malloc(10000); // this buffer contains the ayat
register unsigned int pageNumber = pageNo - 1;
char * header=(char*)malloc(1000);
sprintf(header,"[{\"OFFSET\":%d,\"DATA\":\"",pageNumber+1);
strcpy(buffer,header);
// to get the last ayat of the page
// this loop will fetch all ayats of the page
for (int i = start_ayat; i <= end_ayat; i++) {
sprintf(buffer+strlen(buffer),"<div class=\\\"qr0\\\" data-ayat=\\\"%d\\\" id=\"%d\\\"><span>",i+1,i+1);
get(lang, i, buffer + strlen(buffer)); // len is equal to length of buffer ( strlen() )
strcpy(buffer+strlen(buffer),"<\\/span><\\/div>");
}
// char* footer;
sprintf(buffer+strlen(buffer),"<div class=\\\"pagebreak\">%d<a id=\\\"%d\\\"next\\\"href=\\\"\\/page\\/%d\\\"></a><\\/div <\\/div>\"}]",pageNumber+1,pageNumber+1,pageNumber+1);
__android_log_print(ANDROID_LOG_DEBUG, "LOG_TAG","string: '%s'" , buffer);
int l = strlen(buffer);
char c[l];
strcpy(c,replace(buffer,"\r","<br>"));
jbyteArray ret = (*pEnv)->NewByteArray(pEnv,l);
(*pEnv)->SetByteArrayRegion (pEnv,ret, 0, l, c);
const char * errorKind = NULL;
uint8_t utf8 = checkUtfytes(c, &errorKind);
if (errorKind != NULL) {
free(buffer);
return ret;
} else {
free(buffer);
return ret;
}
I have tried using this too:
return = (*pEnv)->NewStringUTF(pEnv,buffer)
but it still contain illegal UTF characters..
Here is my android side code
byte[] ss = get(a, pos);
s= new String(ss,"UTF-8");
Still getting illegal UTF character error.
I have tried encoding on java side but its no help either,
I am posting here because all other methods that are written here i have already tried but it didn't worked.
PLEASE HELP!!!

Answer 1

May be I am late but your code seems to be correct but according to JNI documentation they doesn't support these characters. You have to handle it from server side. Hope it helps.