Putting Message4 into place to become the new BMessage implementation. Will cleanup USING_MESSAGE4 now.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16709 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/app/MessageUtils.cpp

@@ -0,0 +1,106 @@
+/*
+ * Copyright 2001-2005, Haiku.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *		Erik Jaesler ([email protected])
+ */
+
+/**	Extra messaging utility functions */
+
+#include <string.h>
+#include <ByteOrder.h>
+
+#include <MessageUtils.h>
+
+namespace BPrivate {
+
+uint32
+CalculateChecksum(const uint8 *buffer, int32 size)
+{
+	uint32 sum = 0;
+	uint32 temp = 0;
+
+	while (size > 3) {
+#if defined(__INTEL__)
+		sum += B_SWAP_INT32(*(int32 *)buffer);
+#else
+		sum += *(int32 *)buffer;
+#endif
+		buffer += 4;
+		size -= 4;
+	}
+
+	while (size > 0) {
+		temp = (temp << 8) + *buffer++;
+		size -= 1;
+	}
+
+	return sum + temp;
+}
+
+
+/* entry_ref support functions */
+status_t
+entry_ref_flatten(char *buffer, size_t *size, const entry_ref *ref)
+{
+	memcpy((void *)buffer, (const void *)&ref->device, sizeof(ref->device));
+	buffer += sizeof(ref->device);
+	memcpy((void *)buffer, (const void *)&ref->directory, sizeof(ref->directory));
+	buffer += sizeof (ref->directory);
+
+	size_t nameLength = 0;
+	if (ref->name) {
+		nameLength = strlen(ref->name) + 1;
+		memcpy((void *)buffer, (const void *)ref->name, nameLength);
+	}
+
+	*size = sizeof(ref->device) + sizeof(ref->directory) + nameLength;
+	return B_OK;
+}
+
+
+status_t
+entry_ref_unflatten(entry_ref *ref, const char *buffer, size_t size)
+{
+	if (size < sizeof(ref->device) + sizeof(ref->directory)) {
+		*ref = entry_ref();
+		return B_BAD_VALUE;
+	}
+
+	memcpy((void  *)&ref->device, (const void *)buffer, sizeof(ref->device));
+	buffer += sizeof (ref->device);
+	memcpy((void *)&ref->directory, (const void *)buffer, sizeof(ref->directory));
+	buffer += sizeof(ref->directory);
+
+	if (ref->device != -1 && size > sizeof(ref->device)
+		+ sizeof(ref->directory)) {
+		ref->set_name(buffer);
+		if (ref->name == NULL) {
+			*ref = entry_ref();
+			return B_NO_MEMORY;
+		}
+	} else
+		ref->set_name(NULL);
+
+	return B_OK;
+}
+
+
+status_t
+entry_ref_swap(char *buffer, size_t size)
+{
+	if (size < sizeof(dev_t) + sizeof(ino_t))
+		return B_BAD_VALUE;
+
+	dev_t *dev = (dev_t *)buffer;
+	*dev = B_SWAP_INT32(*dev);
+	buffer += sizeof(dev_t);
+
+	ino_t *ino = (ino_t *)buffer;
+	*ino = B_SWAP_INT64(*ino);
+
+	return B_OK;
+}
+
+} // namespace BPrivate