private long findTheLastIndex0() {
long size = 0;
try {
size = indexFileCache.size();
} catch (Exception e) {
return -1;
}
if (size <= 0) {
return -1;
}
int indexBlockSize = config.indexBlockSize();
for (long block = size / indexBlockSize - 1; block >= 0; block--) {
VanillaMappedBytes mbb = null;
try {
mbb = indexFileCache.acquire(block);
} catch (IOException e) {
continue;
}
if (block > 0 && mbb.readLong(0) == 0) {
continue;
}
int cacheLineSize = config.cacheLineSize();
for (int pos = 0; pos < indexBlockSize; pos += cacheLineSize) {
// if the next line is blank
if (pos + cacheLineSize >= indexBlockSize || mbb.readLong(pos + cacheLineSize) == 0) {
// last cache line.
int pos2 = 8;
for (pos2 = 8; pos2 < cacheLineSize; pos2 += 4) {
if (mbb.readInt(pos + pos2) == 0) {
break;
}
}
return (block * indexBlockSize + pos) / cacheLineSize * (cacheLineSize / 4 - 2)
+ pos2 / 4
- 3;
}
}
return (block + 1) * indexBlockSize / cacheLineSize * (cacheLineSize / 4 - 2);
}
return -1;
}
