Initial community commit

Src/nu/bitbuffer.cpp

@@ -0,0 +1,71 @@
+#include "bitbuffer.h"
+#include <memory.h>
+#include <stdlib.h>
+
+BitBuffer::BitBuffer()
+{
+  buffer=0;
+  length=0;
+  bits=0;
+}
+
+void BitBuffer::WriteBit(char bit)
+{
+  if (bits == 0)
+    Resize(length+1);
+  
+  bit = !!bit;
+  unsigned char mask = 1 << (7-bits);
+  buffer[length-1] &= ~mask;
+  buffer[length-1] |= (bit << (7-bits));
+  bits=(bits+1)%8;
+}
+
+void BitBuffer::Resize(size_t newlen)
+{
+  	if (newlen > length)
+  	{
+		unsigned char *new_buffer = (unsigned char *)realloc(buffer, newlen);
+		if (new_buffer)
+		{
+			buffer = new_buffer;
+    		memset(buffer+length, 0, newlen-length); // zero out new data
+    		length=newlen;
+		}
+		else
+		{
+    		new_buffer = (unsigned char *)malloc(newlen);
+			if (new_buffer)
+			{
+				memcpy(new_buffer, buffer, length);
+				free(buffer);
+				buffer = new_buffer;
+	    		memset(buffer+length, 0, newlen-length); // zero out new data
+	    		length=newlen;
+			}
+		}
+  	}
+}
+
+void BitBuffer::WriteBits(uintptr_t num, size_t bitlen)
+{
+  for (size_t i=0;i!=bitlen;i++)
+  {
+    WriteBit((num >> (bitlen-i-1))&1);
+  }
+}
+
+void BitBuffer::WriteBytes(void *buffer, size_t bytes)
+{
+  unsigned char *b = (unsigned char *)buffer;
+  for (size_t i=0;i!=bytes;i++)
+    WriteBits(b[i], 8);
+}
+
+void BitBuffer::WriteByte(unsigned char byte)
+{
+	for (size_t i=0;i!=8;i++)
+	{
+		WriteBit((byte >> (7-i))&1);
+	}
+}