Initial community commit

Src/pfc/grow_buf.cpp

@@ -0,0 +1,78 @@
+#include "pfc.h"
+
+void grow_buf::makespace(int new_size)
+{
+	if (!ptr || !size)
+	{
+		size = 1;
+		while(size<new_size) 
+		{
+			if (size == (1 << 31))
+			{
+				return;
+			}
+			size<<=1;
+		}
+		ptr = malloc(size);
+	}
+	else
+	{
+		if (size<new_size)
+		{
+			do
+			{
+				if (size == (1 << 31))
+				{
+					free(ptr);
+					ptr=0;
+					return;
+				}
+				size<<=1;
+			}
+			while (size<new_size);
+			ptr = realloc(ptr,size);
+		}
+	}
+}
+
+void * grow_buf::finish()
+{
+	void * rv=0;
+	if (ptr)
+	{
+		rv = realloc(ptr,used);
+		ptr = 0;
+		size = 0;
+		used = 0;
+	}
+	return rv;
+}
+
+void grow_buf::reset()
+{
+	if (ptr) {free(ptr);ptr=0;}
+	used=0;
+	size=0;
+}
+
+static void foo_memcpy(void * dst,const void * src,size_t bytes)
+{
+	if (src) memcpy(dst,src,bytes);
+	else memset(dst,0,bytes);
+}
+
+bool grow_buf::write(const void * data, size_t bytes)
+{
+	makespace(used+bytes);
+	if (!ptr)
+		return false;
+	foo_memcpy((char*)ptr+used,data,bytes);
+	used+=bytes;
+	return true;
+}
+
+void grow_buf::write_ptr(const void * data, int bytes,int offset)
+{
+	if (offset+bytes>used) {used = offset;write(data,bytes);}
+	else foo_memcpy((char*)ptr+offset,data,bytes);
+}