Change bloom filter's dependence on size_t.

That type can vary across platforms, but factored in to a bloom
filter's internal state, e.g. size of the seed.

src/probabilistic/BitVector.cc

@@ -492,10 +492,8 @@ BitVector::size_type BitVector::FindNext(size_type i) const
 	return block ? bi * bits_per_block + lowest_bit(block) : find_from(bi + 1);
 	}
 
-size_t BitVector::Hash() const
+uint64_t BitVector::Hash() const
 	{
-	size_t hash = 0;
-
 	u_char buf[SHA256_DIGEST_LENGTH];
 	SHA256_CTX ctx;
 	sha256_init(&ctx);
@@ -504,7 +502,7 @@ size_t BitVector::Hash() const
 		sha256_update(&ctx, &bits[i], sizeof(bits[i]));
 
 	sha256_final(&ctx, buf);
-	return *reinterpret_cast<size_t*>(buf); // Use the first bytes as seed.
+	return *reinterpret_cast<uint64_t*>(buf); // Use the first bytes as seed.
 	}
 
 BitVector::size_type BitVector::lowest_bit(block_type block)

src/probabilistic/BitVector.h

@@ -15,7 +15,7 @@ namespace probabilistic {
  */
 class BitVector : public SerialObj {
 public:
-	typedef size_t block_type;
+	typedef uint64_t block_type;
 	typedef size_t size_type;
 	typedef bool const_reference;
 
@@ -281,7 +281,7 @@ public:
 	  *
 	  * @return The hash.
 	  */
-	size_t Hash() const;
+	uint64_t Hash() const;
 
 	/**
 	 * Serializes the bit vector.

src/probabilistic/BloomFilter.cc

@@ -111,7 +111,7 @@ BasicBloomFilter* BasicBloomFilter::Clone() const
 
 std::string BasicBloomFilter::InternalState() const
 	{
-	return fmt("%" PRIu64, (uint64_t)bits->Hash());
+	return fmt("%" PRIu64, bits->Hash());
 	}
 
 BasicBloomFilter::BasicBloomFilter()
@@ -219,7 +219,7 @@ CountingBloomFilter* CountingBloomFilter::Clone() const
 
 string CountingBloomFilter::InternalState() const
 	{
-	return fmt("%" PRIu64, (uint64_t)cells->Hash());
+	return fmt("%" PRIu64, cells->Hash());
 	}
 
 IMPLEMENT_SERIAL(CountingBloomFilter, SER_COUNTINGBLOOMFILTER)

src/probabilistic/CounterVector.cc

@@ -153,7 +153,7 @@ CounterVector operator|(const CounterVector& x, const CounterVector& y)
 
 }
 
-size_t CounterVector::Hash() const
+uint64_t CounterVector::Hash() const
 	{
 	return bits->Hash();
 	}

src/probabilistic/CounterVector.h

@@ -131,7 +131,7 @@ public:
 	  *
 	  * @return The hash.
 	  */
-	size_t Hash() const;
+	uint64_t Hash() const;
 
 	/**
 	 * Serializes the bit vector.

src/probabilistic/Hasher.cc

@@ -10,7 +10,7 @@
 
 using namespace probabilistic;
 
-size_t Hasher::MakeSeed(const void* data, size_t size)
+uint64_t Hasher::MakeSeed(const void* data, size_t size)
 	{
 	u_char buf[SHA256_DIGEST_LENGTH];
 	SHA256_CTX ctx;
@@ -29,7 +29,7 @@ size_t Hasher::MakeSeed(const void* data, size_t size)
 		}
 
 	sha256_final(&ctx, buf);
-	return *reinterpret_cast<size_t*>(buf); // Use the first bytes as seed.
+	return *reinterpret_cast<uint64_t*>(buf); // Use the first bytes as seed.
 	}
 
 Hasher::digest_vector Hasher::Hash(const HashKey* key) const

src/probabilistic/Hasher.h

@@ -30,7 +30,7 @@ public:
 	 *
 	 * @return A seed suitable for hashers.
 	 */
-	static size_t MakeSeed(const void* data, size_t size);
+	static uint64_t MakeSeed(const void* data, size_t size);
 
 	/**
 	 * Destructor.