// TODO: Allow us to read an XML file from stdin
bool HaggleKernel::readStartupDataObject(FILE *fp)
{
long len;
ssize_t k;
size_t i, j, items, total_bytes_read = 0;
char *data;
bool ret = false;
if (!fp) {
HAGGLE_ERR("Invalid file pointer\n");
return false;
}
// Figure out how large the file is.
fseek(fp, 0, SEEK_END);
// No, this does not handle files larger than 2^31 bytes, but that
// shouldn't be a problem, and could be easily fixed if necessary.
len = ftell(fp);
fseek(fp, 0, SEEK_SET);
// Allocate space to put the data in. +1 byte
// so that we make sure we read until EOF in
// the read loop.
data = new char[++len];
if (!data) {
HAGGLE_ERR("Could not allocate data\n");
return false;
}
// Read the data:
do {
items = fread(data + total_bytes_read, 1, len - total_bytes_read, fp);
total_bytes_read += items;
} while (items != 0 && total_bytes_read < (size_t)len);
if (ferror(fp) != 0) {
HAGGLE_ERR("File error when reading configuration\n");
goto out;
}
// Check that we reached EOF
if (feof(fp) != 0) {
DataObject *dObj = NULL;
// Success! Now create data object(s):
i = 0;
while (i < total_bytes_read) {
if (!dObj)
dObj = DataObject::create_for_putting();
if (!dObj) {
HAGGLE_ERR("Could not create data object for putting\n");
ret = false;
goto out;
}
k = dObj->putData(&(data[i]), total_bytes_read - i, &j);
// Check return value:
if (k < 0) {
// Error occured, stop everything:
HAGGLE_ERR("Error parsing startup data object "
"(byte %ld of %ld)\n", i, total_bytes_read);
i = total_bytes_read;
} else {
// No error, check if we're done:
if (k == 0 || j == 0) {
// Done with this data object:
#ifdef DEBUG
dObj->print(NULL); // MOS - NULL means print to debug trace
#endif
addEvent(new Event(EVENT_TYPE_DATAOBJECT_RECEIVED, DataObjectRef(dObj)));
// Should absolutely not deallocate this, since it
// is in the event queue:
dObj = NULL;
// These bytes have been consumed:
i += k;
ret = true;
} else if (k > 0) {
// These bytes have been consumed:
i += k;
}
}
}
// Clean up:
if (dObj) {
delete dObj;
}
}
out:
delete [] data;
return ret;
}
