C level serialisation

src/polluck_blockchain/block.hpp

@@ -11,6 +11,6 @@ struct Block {
     std::string hash;
 
     Block() : index(0), timestamp(0), nonce(0), data(), prev_hash(), hash() {}
-    Block(uint64_t idx, double ts, uint64_t n, const std::string& d, const std::string& pre_h, const std::string& h)
+    Block(uint64_t idx, uint64_t ts, uint64_t n, const std::string& d, const std::string& pre_h, const std::string& h)
         : index(idx), timestamp(ts), nonce(n), data(d), prev_hash(pre_h), hash(h) {}
 };

src/polluck_blockchain/block.pxd

@@ -4,7 +4,7 @@ from libc cimport stdint
 cdef extern from "block.hpp" namespace "":
     cdef cppclass Block:
         stdint.uint64_t index
-        double timestamp
+        stdint.uint64_t timestamp
         stdint.uint64_t nonce
         string data
         string prev_hash

src/polluck_blockchain/placeholder_native.pyx

@@ -17,18 +17,40 @@ from polluck_blockchain.block cimport Block
 from libcpp.unordered_map cimport unordered_map
 from libcpp.string cimport string
 from libc.stdint cimport uint64_t
+from libc.stdlib cimport malloc, free
+from libc.string cimport memcpy
 from cython.operator import postincrement, dereference
 
+
 ctypedef unsigned long ULong
 ctypedef unordered_map[uint64_t, Block*] BcHashmap
 
-cdef timestamp_to_datetime(double ts):
-    return datetime.datetime.fromtimestamp(ts, dopt_basics.datetime.TIMEZONE_UTC)
+cdef timestamp_to_datetime(uint64_t ts):
+    return datetime.datetime.fromtimestamp(float(ts), dopt_basics.datetime.TIMEZONE_UTC)
 
 
-cdef float_to_bytes(double num):
-    return struct.pack(">d", num)
+# cdef float_to_bytes(double num):
+#     return struct.pack(">d", num)
 
+cdef int serialize_uint32(unsigned char* out, unsigned int v) except -1 nogil:
+    out[0] = (v >> 24) & 0xFF
+    out[1] = (v >> 16) & 0xFF
+    out[2] = (v >> 8)  & 0xFF
+    out[3] = v & 0xFF
+
+cdef int serialize_uint64(unsigned char* out, unsigned long long v) except -1 nogil:
+    out[0] = (v >> 56) & 0xFF
+    out[1] = (v >> 48) & 0xFF
+    out[2] = (v >> 40) & 0xFF
+    out[3] = (v >> 32) & 0xFF
+    out[4] = (v >> 24) & 0xFF
+    out[5] = (v >> 16) & 0xFF
+    out[6] = (v >> 8)  & 0xFF
+    out[7] = v & 0xFF
+
+cdef struct SerializeResult:
+    unsigned char *ptr
+    size_t size
 
 cdef class PyBlock:
     cdef:
@@ -52,26 +74,19 @@ cdef class PyBlock:
         if not from_ptr:
             self.BlockC = new Block(
                 index,
-                datetime.datetime(2025, 12, 1, 12, 0, 0).timestamp(),
+                int(datetime.datetime(2025, 12, 1, 12, 0, 0).timestamp()),
                 nonce,
                 data.encode("UTF-8"),
                 previous_hash.encode("UTF-8"),
                 "".encode("UTF-8"),
             )
             if self.BlockC == NULL:
-                raise MemoryError("Allocation of block object failed")
+                raise MemoryError()
 
             self.ptr_owner = True
 
     def __init__(self, *args, **kwargs):
         pass
-        # self._index = index
-        # # self._timestamp = dopt_basics.datetime.current_time_tz().timestamp()
-        # self._timestamp = datetime.datetime(2025, 12, 1, 12, 0, 0).timestamp()
-        # self._data = data.encode("UTF-8")
-        # self._prev_hash = previous_hash.encode("UTF-8")
-        # self._nonce = nonce
-        # self._hash = "".encode("UTF-8")
     
     def __dealloc__(self):
         if self.BlockC is not NULL and self.ptr_owner is True:
@@ -144,6 +159,58 @@ cdef class PyBlock:
     def hash(self):
         return self.BlockC.hash.decode("UTF-8")
 
+    cdef SerializeResult bytes_serialize_c(self):
+        cdef:
+            size_t total_len
+            unsigned char* buf
+            size_t pos = 0
+        
+        # index (8), timestamp (8), nonce (8), data, prev_hash
+        total_len = (
+            <size_t>(8 * 3) +
+            self.BlockC.data.size() + 
+            self.BlockC.prev_hash.size()
+        )
+        buf = <unsigned char*>malloc(total_len * sizeof(unsigned char))
+
+        if buf == NULL:
+            raise MemoryError()
+        
+        serialize_uint64(buf + pos, self.BlockC.index)
+        pos += 8
+        serialize_uint64(buf + pos, self.BlockC.timestamp)
+        pos += 8
+        serialize_uint64(buf + pos, self.BlockC.nonce)
+        pos += 8
+        # Copy data
+        memcpy(
+            buf + pos,
+            self.BlockC.data.c_str(),
+            self.BlockC.data.size(),
+        )
+        pos += self.BlockC.data.size()
+        # Copy prev_hash
+        memcpy(
+            buf + pos,
+            self.BlockC.prev_hash.c_str(),
+            self.BlockC.prev_hash.size(),
+        )
+        pos += self.BlockC.prev_hash.size()
+
+        return SerializeResult(buf, total_len)
+
+    def bytes_serialize(self):
+        cdef SerializeResult serialize_res
+        try:
+            serialize_res = self.bytes_serialize_c()
+            return serialize_res.ptr[:serialize_res.size]
+        finally:
+            free(serialize_res.ptr)
+
+
+
+
+
     # @hash.setter
     # def hash(self, value):
     #     if not isinstance(value, str):
@@ -222,7 +289,7 @@ cdef class Blockchain:
     def create_genesis_block(self):
         cdef Block *block = new Block(
             self._index,
-            datetime.datetime(2025, 12, 1, 12, 0, 0).timestamp(),
+            int(datetime.datetime(2025, 12, 1, 12, 0, 0).timestamp()),
             0,
             "Genesis Block".encode("UTF-8"),
             "0".encode("UTF-8"),
@@ -242,7 +309,7 @@ cdef class Blockchain:
 
         cdef Block *block = new Block(
             new_idx,
-            datetime.datetime(2025, 12, 1, 12, 0, 0).timestamp(),
+            int(datetime.datetime(2025, 12, 1, 12, 0, 0).timestamp()),
             0,
             data.encode("UTF-8"),
             prev_hash,