static jobject nativeNewInstanceFromFileDescriptor(JNIEnv* env, jobject clazz,
jobject fileDescriptor, jboolean isShareable) {
NPE_CHECK_RETURN_ZERO(env, fileDescriptor);
jint descriptor = jniGetFDFromFileDescriptor(env, fileDescriptor);
SkStream *stream = NULL;
struct stat fdStat;
int newFD;
if (fstat(descriptor, &fdStat) == -1) {
doThrowIOE(env, "broken file descriptor");
return nullObjectReturn("fstat return -1");
}
if (isShareable &&
S_ISREG(fdStat.st_mode) &&
(newFD = ::dup(descriptor)) != -1) {
SkFDStream* fdStream = new SkFDStream(newFD, true);
if (!fdStream->isValid()) {
fdStream->unref();
return NULL;
}
stream = fdStream;
} else {
/* Restore our offset when we leave, so we can be called more than once
with the same descriptor. This is only required if we didn't dup the
file descriptor, but it is OK to do it all the time.
*/
AutoFDSeek as(descriptor);
SkFDStream* fdStream = new SkFDStream(descriptor, false);
if (!fdStream->isValid()) {
fdStream->unref();
return NULL;
}
stream = buildSkMemoryStream(fdStream);
fdStream->unref();
}
return doBuildTileIndex(env, stream);
}
