Spooky hash, smarter animqueue diffs

luprex/core/cpp/streambuffer.hpp

@@ -211,10 +211,12 @@
 #define STREAMBUFFER_HPP
 
 #include "luastack.hpp"
+#include "util.hpp"
 #include <cstdint>
 #include <string>
 #include <sstream>
 #include <cassert>
+#include <utility>
 
 class StreamException
 {
@@ -316,6 +318,7 @@ public:
     void write_int64(int64_t v);
     void write_float(float f);
     void write_double(double d);
+    void write_hashvalue(const util::HashValue &hv);
     void write_uint8(uint8_t v) { write_int8(v); }
     void write_uint16(uint16_t v) { write_int16(v); }
     void write_uint32(uint32_t v) { write_int32(v); }
@@ -345,6 +348,7 @@ public:
     int64_t read_int64();
     float read_float();
     double read_double();
+    util::HashValue read_hashvalue();
     uint8_t  read_uint8() { return read_int8(); }
     uint16_t read_uint16() { return read_int16(); }
     uint32_t read_uint32() { return read_int32(); }
@@ -375,6 +379,9 @@ public:
     // Rewind the write cursor to a previous position.
     void unwrite_to(int64_t write_count);
     
+    // Calculate a noncryptographic but good hash of what's in the buffer.
+    util::HashValue hash() const;
+
     // Use the stream buffer as a lua_Writer.
     static int lua_writer(lua_State *L, const void* p, size_t sz, void* ud);
     void *lua_writer_ud();