More optimization for Message2. It now uses a more lightweight BSimpleMallocIO instead of the full blown BMallocIO. This wastes less memory and reduces unnecessary overhead when unflattening.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@13861 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/app/MessageBody2.h

@@ -43,7 +43,7 @@ public:
 		status_t			Flatten(BDataIO *stream) const;
 		status_t			Unflatten(BDataIO *stream);
 
-		status_t			AddData(const char *name, BMallocIO *buffer,
+		status_t			AddData(const char *name, BSimpleMallocIO *buffer,
 								type_code type);
 		status_t			RemoveData(const char *name, int32 index = 0);
 
@@ -52,7 +52,7 @@ public:
 								int32 index, const void **data,
 								ssize_t *numBytes) const;
 		status_t			ReplaceData(const char *name, int32 index,
-								BMallocIO *buffer, type_code type);
+								BSimpleMallocIO *buffer, type_code type);
 
 		status_t			Rename(const char *oldName, const char *newName);
 		status_t			RemoveName(const char *name);
@@ -77,6 +77,8 @@ private:
 		BList				fFieldList;
 		BMessageField		**fFieldTable;
 		int32				fFieldTableSize;
+
+mutable	ssize_t				fFlattenedSize;
 };
 
 } // namespace BPrivate

headers/private/app/MessageField2.h

@@ -25,6 +25,8 @@
 
 namespace BPrivate {
 
+class BSimpleMallocIO;
+
 class BMessageField {
 public:
 							BMessageField();
@@ -41,10 +43,9 @@ public:
 		uint8				NameLength() const { return fName.Length(); };
 		type_code			Type() const { return fType; };
 
-		void				AddItem(BMallocIO *item);
-		void				ReplaceItem(int32 index, BMallocIO *item,
-								bool deleteOld = true);
-		void				RemoveItem(int32 index, bool deleteIt = true);
+		void				AddItem(BSimpleMallocIO *item);
+		void				ReplaceItem(int32 index, BSimpleMallocIO *item);
+		void				RemoveItem(int32 index);
 		int32				CountItems() const { return fItems.CountItems(); };
 		size_t				SizeAt(int32 index) const;
 		const void			*BufferAt(int32 index) const;

headers/private/app/MessageUtils2.h

@@ -116,15 +116,14 @@ public:
 								if (fError < B_OK)
 									throw fError;
 
-								if (IsSwapping()) {
+								if (IsSwapping())
 									byte_swap(data);
-								}
 							}
 
 		template<class T>
 		inline void			operator()(T data, size_t len)
 							{
-								fError = fStream->Read((void*)data, len);
+								fError = fStream->Read((void *)data, len);
 								if (fError < B_OK)
 									throw fError;
 							}

headers/private/app/SimpleMallocIO.h

@@ -0,0 +1,88 @@
+/*
+ * Copyright 2005, Haiku.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *		Michael Lotz <[email protected]>
+ */
+
+/* A BMallocIO similar structure but with less overhead */
+
+#ifndef _SIMPLE_MALLOC_IO_H_
+#define _SIMPLE_MALLOC_IO_H_
+
+#include <malloc.h>
+
+namespace BPrivate {
+
+class BSimpleMallocIO {
+public:
+						BSimpleMallocIO(size_t size)
+							:	fSize(size)
+						{
+							fBuffer = (char *)malloc(size);
+						}
+
+						~BSimpleMallocIO()
+						{
+							free(fBuffer);
+						}
+
+		void			Read(void *buffer)
+						{
+							memcpy(buffer, fBuffer, fSize);
+						}
+
+		void			Read(void *buffer, size_t size)
+						{
+							memcpy(buffer, fBuffer, size);
+						}
+
+		void			ReadAt(off_t pos, void *buffer, size_t size)
+						{
+							memcpy(buffer, fBuffer + pos, size);
+						}
+
+		void			Write(const void *buffer)
+						{
+							memcpy(fBuffer, buffer, fSize);
+						}
+
+		void			Write(const void *buffer, size_t size)
+						{
+							memcpy(fBuffer, buffer, size);
+						}
+
+		void			WriteAt(off_t pos, const void *buffer, size_t size)
+						{
+							memcpy(fBuffer + pos, buffer, size);
+						}
+
+		status_t		SetSize(off_t size)
+						{
+							fBuffer = (char *)realloc(fBuffer, size);
+							if (!fBuffer)
+								return B_NO_MEMORY;
+
+							fSize = size;
+							return B_OK;
+						}
+
+		char			*Buffer()
+						{
+							return fBuffer;
+						}
+
+		size_t			BufferLength()
+						{
+							return fSize;
+						}
+
+private:
+		char			*fBuffer;
+		size_t			fSize;
+};
+
+} // namespace BPivate
+
+#endif // _SIMPLE_MALLOC_IO_H_

src/kits/app/Message2.cpp

@@ -34,11 +34,12 @@
 
 #include <AppMisc.h>
 #include <KMessage.h>
-#include <MessageUtils2.h>
 #include <TokenSpace.h>
 
 #include "MessageBody2.h"
 #include "MessageField2.h"
+#include "MessageUtils2.h"
+#include "SimpleMallocIO.h"
 #include "dano_message.h"
 
 // flags for the overall message (the bitfield is 1 byte)
@@ -873,9 +874,6 @@ BMessage::Unflatten(BDataIO *stream)
 		header.WriteTo(*this);
 
 		status = fBody->Unflatten(stream);
-		if (status < B_OK)
-			return status;
-
 	} catch (status_t &error) {
 		status = error;
 	}
@@ -1152,11 +1150,9 @@ BMessage::AddMessenger(const char *name, BMessenger messenger)
 status_t
 BMessage::AddRef(const char* name, const entry_ref* ref)
 {
-	BMallocIO *buffer = new BMallocIO();
-	buffer->SetSize(sizeof(entry_ref) + B_PATH_NAME_LENGTH);
-
-	size_t size;
-	status_t error = entry_ref_flatten((char *)buffer->Buffer(), &size, ref);
+	size_t size = sizeof(entry_ref) + B_PATH_NAME_LENGTH;
+	BSimpleMallocIO *buffer = new BSimpleMallocIO(size);
+	status_t error = entry_ref_flatten(buffer->Buffer(), &size, ref);
 	buffer->SetSize(size);
 
 	if (error >= B_OK)
@@ -1172,8 +1168,9 @@ BMessage::AddRef(const char* name, const entry_ref* ref)
 status_t
 BMessage::AddMessage(const char *name, const BMessage *msg)
 {
-	BMallocIO *buffer = new BMallocIO();
-	status_t error = msg->Flatten(buffer);
+	size_t size = msg->FlattenedSize();
+	BSimpleMallocIO *buffer = new BSimpleMallocIO(size);
+	status_t error = msg->Flatten(buffer->Buffer(), size);
 
 	if (error >= B_OK)
 		error = fBody->AddData(name, buffer, B_MESSAGE_TYPE);
@@ -1189,10 +1186,9 @@ status_t
 BMessage::AddFlat(const char *name, BFlattenable *object, int32 count)
 {
 	ssize_t size = object->FlattenedSize();
-	BMallocIO *buffer = new BMallocIO();
-	buffer->SetSize(size);
+	BSimpleMallocIO *buffer = new BSimpleMallocIO(size);
+	status_t error = object->Flatten(buffer->Buffer(), size);
 
-	status_t error = object->Flatten((void *)buffer->Buffer(), size);
 	if (error >= B_OK)
 		error = fBody->AddData(name, buffer, object->TypeCode());
 
@@ -1212,8 +1208,8 @@ BMessage::AddData(const char *name, type_code type, const void *data,
 	// the user attempts to add something bigger or smaller.  We may need to
 	// enforce the size thing.
 
-	BMallocIO *buffer = new BMallocIO();
-	buffer->Write(data, numBytes);
+	BSimpleMallocIO *buffer = new BSimpleMallocIO(numBytes);
+	buffer->Write(data);
 	status_t error = fBody->AddData(name, buffer, type);
 
 	if (error < B_OK)
@@ -1364,7 +1360,7 @@ BMessage::FindMessage(const char *name, int32 index, BMessage *msg) const
 	status_t error = FindData(name, B_MESSAGE_TYPE, index, (const void **)&data, &size);
 
 	if (!error)
-		error = msg->Unflatten((const char*)data);
+		error = msg->Unflatten((const char *)data);
 	else
 		*msg = BMessage();
 
@@ -1493,11 +1489,9 @@ BMessage::ReplaceRef(const char *name, const entry_ref *ref)
 status_t
 BMessage::ReplaceRef(const char *name, int32 index, const entry_ref *ref)
 {
-	BMallocIO *buffer = new BMallocIO();
-	buffer->SetSize(sizeof(entry_ref) + B_PATH_NAME_LENGTH);
-
-	size_t size;
-	status_t error = entry_ref_flatten((char *)buffer->Buffer(), &size, ref);
+	size_t size = sizeof(entry_ref) + B_PATH_NAME_LENGTH;
+	BSimpleMallocIO *buffer = new BSimpleMallocIO(size);
+	status_t error = entry_ref_flatten(buffer->Buffer(), &size, ref);
 	buffer->SetSize(size);
 
 	if (error >= B_OK)
@@ -1520,8 +1514,9 @@ BMessage::ReplaceMessage(const char *name, const BMessage *msg)
 status_t
 BMessage::ReplaceMessage(const char *name, int32 index, const BMessage *msg)
 {
-	BMallocIO *buffer = new BMallocIO();
-	status_t error = msg->Flatten(buffer);
+	size_t size = msg->FlattenedSize();
+	BSimpleMallocIO *buffer = new BSimpleMallocIO(size);
+	status_t error = msg->Flatten(buffer->Buffer(), size);
 
 	if (error >= B_OK)
 		error = fBody->ReplaceData(name, index, buffer, B_MESSAGE_TYPE);
@@ -1544,10 +1539,9 @@ status_t
 BMessage::ReplaceFlat(const char *name, int32 index, BFlattenable *object)
 {
 	ssize_t size = object->FlattenedSize();
-	BMallocIO *buffer = new BMallocIO();
-	buffer->SetSize(size);
+	BSimpleMallocIO *buffer = new BSimpleMallocIO(size);
+	status_t error = object->Flatten(buffer->Buffer(), size);
 
-	status_t error = object->Flatten((void *)buffer->Buffer(), size);
 	if (error >= B_OK)
 		error = fBody->ReplaceData(name, index, buffer, object->TypeCode());
 
@@ -1570,8 +1564,8 @@ status_t
 BMessage::ReplaceData(const char *name, type_code type, int32 index,
 	const void *data, ssize_t data_size)
 {
-	BMallocIO *buffer = new BMallocIO();
-	buffer->Write(data, data_size);
+	BSimpleMallocIO *buffer = new BSimpleMallocIO(data_size);
+	buffer->Write(data);
 	status_t error = fBody->ReplaceData(name, index, buffer, type);
 
 	if (error < B_OK)
@@ -1629,7 +1623,7 @@ BMessage::operator delete(void *ptr, size_t size)
 status_t
 BMessage::real_flatten(char *result, ssize_t size) const
 {
-	BMemoryIO stream((void*)result, size);
+	BMemoryIO stream((void *)result, size);
 	return real_flatten(&stream, NULL);
 }
 
@@ -1640,9 +1634,12 @@ BMessage::real_flatten(BDataIO *stream, ssize_t *size) const
 	Header header(*this);
 
 	status_t error = header.WriteTo(*stream);
-	if (!error)
+	if (error >= B_OK)
 		error = fBody->Flatten(stream);
 
+	if (size)
+		*size = FlattenedSize();
+
 	return error;
 }
 
@@ -1686,14 +1683,14 @@ BMessage::calc_hdr_size(uchar flags) const
 	ssize_t size = min_hdr_size();
 
 	if (fTarget != B_NULL_TOKEN)
-		size += sizeof (fTarget);
+		size += sizeof(fTarget);
 
 	if (fReplyTo.port >= 0
 		&& fReplyTo.target != B_NULL_TOKEN
 		&& fReplyTo.team >= 0) {
-		size += sizeof (fReplyTo.port);
-		size += sizeof (fReplyTo.target);
-		size += sizeof (fReplyTo.team);
+		size += sizeof(fReplyTo.port);
+		size += sizeof(fReplyTo.target);
+		size += sizeof(fReplyTo.team);
 
 		size += 4;	// For the "big" flags
 	}

src/kits/app/MessageBody2.cpp

@@ -9,14 +9,17 @@
 /* BMessageBody handles data storage and retrieval for BMessage. */
 
 #include <stdio.h>
-#include <DataIO.h>
-#include <MessageUtils.h>
 #include <TypeConstants.h>
 #include "MessageBody2.h"
+#include "MessageUtils2.h"
+#include "SimpleMallocIO.h"
 
 namespace BPrivate {
 
 static int64 sPadding[2] = { 0, 0 };
+static uint8 sPadLengths[8] = { 4, 3, 2, 1, 0, 7, 6, 5 };
+
+#define CALC_PADDING_8(x) sPadLengths[x % 8]
 
 BMessageBody::BMessageBody()
 {
@@ -59,6 +62,7 @@ BMessageBody::operator=(const BMessageBody &other)
 status_t
 BMessageBody::InitCommon()
 {
+	fFlattenedSize = -1;
 	fFieldTableSize = 100;
 	fFieldTable = new BMessageField *[fFieldTableSize];
 	HashClear();
@@ -201,6 +205,7 @@ BMessageBody::Rename(const char *oldName, const char *newName)
 
 	field->SetName(newName);
 	HashInsert(HashRemove(oldName));
+	fFlattenedSize = -1;
 	return B_OK;
 }
 
@@ -208,6 +213,9 @@ BMessageBody::Rename(const char *oldName, const char *newName)
 ssize_t
 BMessageBody::FlattenedSize() const
 {
+	if (fFlattenedSize > 0)
+		return fFlattenedSize;
+
 	ssize_t size = 1; // for MSG_LAST_ENTRY
 
 	for (int32 index = 0; index < fFieldList.CountItems(); index++) {
@@ -233,15 +241,12 @@ BMessageBody::FlattenedSize() const
 		// name length byte and name length
 		size += 1 + field->NameLength();
 
-		// individual sizes
-		if (!(flags & MSG_FLAG_FIXED_SIZE)) {
-			size += field->CountItems() * sizeof(size_t);
-			size += field->TotalPadding();
-		}
-
 		size += field->TotalSize();
 	}
 
+	// cache the value for next time.
+	// changing the body will reset this.
+	fFlattenedSize = size;
 	return size;
 }
 
@@ -249,8 +254,6 @@ BMessageBody::FlattenedSize() const
 status_t
 BMessageBody::Flatten(BDataIO *stream) const
 {
-	status_t error = B_OK;
-
 	for (int32 index = 0; index < fFieldList.CountItems(); index++) {
 		BMessageField *field = (BMessageField *)fFieldList.ItemAt(index);
 
@@ -270,16 +273,8 @@ BMessageBody::Flatten(BDataIO *stream) const
 				stream->Write(&count, sizeof(count));
 		}
 
-		bool isFixed = flags & MSG_FLAG_FIXED_SIZE;
-
-		// overall data size
+		// overall data size (includes padding for non fixed size fields)
 		size_t size = field->TotalSize();
-		if (!isFixed) {
-			// add bytes for holding each items size
-			size += count * sizeof(size_t);
-			size += field->TotalPadding();
-		}
-
 		if (flags & MSG_FLAG_MINI_DATA) {
 			uint8 miniSize = (uint8)size;
 			stream->Write(&miniSize, sizeof(miniSize));
@@ -293,32 +288,29 @@ BMessageBody::Flatten(BDataIO *stream) const
 		// name
 		stream->Write(field->Name(), nameLength);
 
-		// if we have a fixed size we initialize size once here
-		if (isFixed)
-			size = field->SizeAt(0);
-
 		// data items
-		for (int32 dataIndex = 0; dataIndex < count; dataIndex++) {
-			if (!isFixed) {
-				// set the size for each item
+		if (flags & MSG_FLAG_FIXED_SIZE) {
+			size = field->SizeAt(0);
+			for (int32 dataIndex = 0; dataIndex < count; dataIndex++)
+				stream->Write(field->BufferAt(dataIndex), size);
+		} else {
+			for (int32 dataIndex = 0; dataIndex < count; dataIndex++) {
 				size = field->SizeAt(dataIndex);
 				stream->Write(&size, sizeof(size));
+
+				stream->Write(field->BufferAt(dataIndex), size);
+				size_t error = stream->Write(sPadding, CALC_PADDING_8(size));
 			}
-
-			error = stream->Write(field->BufferAt(dataIndex), size);
-
-			if (!isFixed)
-				error = stream->Write(sPadding, calc_padding(size + 4, 8));
 		}
 	}
 
-	if (error >= B_OK) {
-		uint8 lastEntry = 0;
-		error = stream->Write(&lastEntry, sizeof(lastEntry));
-	}
+	uint8 lastEntry = 0;
+	size_t error = stream->Write(&lastEntry, sizeof(lastEntry));
 
-	if (error >= B_OK)
+	if (error > B_OK)
 		return B_OK;
+	else if (error == 0)
+		return B_ERROR;
 
 	return error;
 }
@@ -344,6 +336,7 @@ BMessageBody::Unflatten(BDataIO *stream)
 			int32 itemCount;
 			int32 dataLength;
 			uint8 littleData;
+
 			if (flags & MSG_FLAG_SINGLE_ITEM) {
 				itemCount = 1;
 
@@ -398,9 +391,8 @@ BMessageBody::Unflatten(BDataIO *stream)
 				int32 itemSize = dataLength / itemCount;
 
 				for (int32 index = 0; index < itemCount; index++) {
-					BMallocIO *buffer = new BMallocIO();
-					buffer->SetSize(itemSize);
-					reader((char *)buffer->Buffer(), itemSize);
+					BSimpleMallocIO *buffer = new BSimpleMallocIO(itemSize);
+					reader(buffer->Buffer(), itemSize);
 					field->AddItem(buffer);
 				}
 			} else {
@@ -408,12 +400,10 @@ BMessageBody::Unflatten(BDataIO *stream)
 				ssize_t dataLength;
 
 				for (int32 index = 0; index < itemCount; index++) {
-					BMallocIO *buffer = new BMallocIO();
 					reader(dataLength);
-					buffer->SetSize(dataLength);
-
-					reader((char *)buffer->Buffer(), dataLength);
-					reader(padding, calc_padding(dataLength + 4, 8));
+					BSimpleMallocIO *buffer = new BSimpleMallocIO(dataLength);
+					reader(buffer->Buffer(), dataLength);
+					reader(padding, CALC_PADDING_8(dataLength));
 					field->AddItem(buffer);
 				}
 			}
@@ -429,7 +419,7 @@ BMessageBody::Unflatten(BDataIO *stream)
 
 
 status_t
-BMessageBody::AddData(const char *name, BMallocIO *buffer, type_code type)
+BMessageBody::AddData(const char *name, BSimpleMallocIO *buffer, type_code type)
 {
 	status_t error = B_OK;
 	BMessageField *foundField = FindData(name, type, error);
@@ -457,6 +447,7 @@ BMessageBody::AddData(const char *name, BMallocIO *buffer, type_code type)
 		foundField->AddItem(buffer);
 	}
 
+	fFlattenedSize = -1;
 	return error;
 }
 
@@ -485,7 +476,7 @@ BMessageBody::AddField(const char *name, type_code type, status_t &error)
 
 
 status_t
-BMessageBody::ReplaceData(const char *name, int32 index, BMallocIO *buffer,
+BMessageBody::ReplaceData(const char *name, int32 index, BSimpleMallocIO *buffer,
 	type_code type)
 {
 	if (type == B_ANY_TYPE)
@@ -501,6 +492,7 @@ BMessageBody::ReplaceData(const char *name, int32 index, BMallocIO *buffer,
 		return B_ERROR;
 
 	field->ReplaceItem(index, buffer);
+	fFlattenedSize = -1;
 	return error;
 }
 
@@ -508,9 +500,8 @@ BMessageBody::ReplaceData(const char *name, int32 index, BMallocIO *buffer,
 status_t
 BMessageBody::RemoveData(const char *name, int32 index)
 {
-	if (index < 0) {
+	if (index < 0)
 		return B_BAD_VALUE;
-	}
 
 	status_t error = B_OK;
 	BMessageField *field = FindData(name, B_ANY_TYPE, error);
@@ -518,10 +509,10 @@ BMessageBody::RemoveData(const char *name, int32 index)
 	if (field) {
 		if (index < field->CountItems()) {
 			field->RemoveItem(index);
+			fFlattenedSize = -1;
 
-			if (field->CountItems() == 0) {
+			if (field->CountItems() == 0)
 				RemoveName(name);
-			}
 		} else
 			error = B_BAD_INDEX;
 	}
@@ -538,6 +529,7 @@ BMessageBody::RemoveName(const char *name)
 
 	if (field) {
 		fFieldList.RemoveItem(field);
+		fFlattenedSize = -1;
 		HashRemove(name);
 		delete field;
 	}
@@ -555,6 +547,7 @@ BMessageBody::MakeEmpty()
 	}
 
 	fFieldList.MakeEmpty();
+	fFlattenedSize = -1;
 	HashClear();
 	return B_OK;
 }

src/kits/app/MessageField2.cpp

@@ -7,18 +7,18 @@
  */
 
 #include <stdio.h>
-#include <DataIO.h>
-#include <MessageUtils.h>
 #include <TypeConstants.h>
 #include "MessageField2.h"
+#include "SimpleMallocIO.h"
 
 namespace BPrivate {
 
+#define ROUND_TO_8(x) (fFixedSize ? x : (x + 11) & ~7)
+
 BMessageField::BMessageField()
 	:	fType(0),
 		fFixedSize(false),
 		fTotalSize(0),
-		fTotalPadding(0),
 		fNext(NULL)
 {
 	SetName("");
@@ -28,7 +28,6 @@ BMessageField::BMessageField()
 BMessageField::BMessageField(const char *name, type_code type)
 	:	fType(type),
 		fTotalSize(0),
-		fTotalPadding(0),
 		fNext(NULL)
 {
 	SetName(name);
@@ -58,13 +57,12 @@ BMessageField::operator=(const BMessageField &other)
 		fType = other.fType;
 		fFixedSize = other.fFixedSize;
 		fTotalSize = other.fTotalSize;
-		fTotalPadding = other.fTotalPadding;
 		fNext = NULL;
 
 		for (int32 index = 0; index < other.fItems.CountItems(); index++) {
-			BMallocIO *otherBuffer = (BMallocIO *)other.fItems.ItemAt(index);
-			BMallocIO *newBuffer = new BMallocIO;
-			newBuffer->Write(otherBuffer->Buffer(), otherBuffer->BufferLength());
+			BSimpleMallocIO *otherBuffer = (BSimpleMallocIO *)other.fItems.ItemAt(index);
+			BSimpleMallocIO *newBuffer = new BSimpleMallocIO(otherBuffer->BufferLength());
+			newBuffer->Write(otherBuffer->Buffer());
 			fItems.AddItem((void *)newBuffer);
 		}
 	}
@@ -77,7 +75,7 @@ void
 BMessageField::MakeEmpty()
 {
 	for (int32 index = 0; index < fItems.CountItems(); index++) {
-		BMallocIO *item = (BMallocIO *)fItems.ItemAt(index);
+		BSimpleMallocIO *item = (BSimpleMallocIO *)fItems.ItemAt(index);
 		delete item;
 	}
 
@@ -89,11 +87,11 @@ uint8
 BMessageField::Flags()
 {
 	uint8 flags = MSG_FLAG_VALID;
-	
+
 	if (fItems.CountItems() == 1)
 		flags |= MSG_FLAG_SINGLE_ITEM;
 
-	if (fTotalSize + fTotalPadding < 255)
+	if (fTotalSize < 255)
 		flags |= MSG_FLAG_MINI_DATA;
 
 	if (fFixedSize)
@@ -115,46 +113,39 @@ BMessageField::SetName(const char *name)
 
 
 void
-BMessageField::AddItem(BMallocIO *item)
+BMessageField::AddItem(BSimpleMallocIO *item)
 {
 	fItems.AddItem((void *)item);
-	fTotalSize += item->BufferLength();
-	fTotalPadding += calc_padding(item->BufferLength() + 4, 8);
+	fTotalSize += ROUND_TO_8(item->BufferLength());
 }
 
 
 void
-BMessageField::ReplaceItem(int32 index, BMallocIO *item, bool deleteOld)
+BMessageField::ReplaceItem(int32 index, BSimpleMallocIO *item)
 {
-	BMallocIO *oldItem = (BMallocIO *)fItems.ItemAt(index);
-	fTotalSize -= oldItem->BufferLength();
-	fTotalPadding -= calc_padding(oldItem->BufferLength() + 4, 8);
-
+	BSimpleMallocIO *oldItem = (BSimpleMallocIO *)fItems.ItemAt(index);
 	fItems.ReplaceItem(index, item);
-	fTotalSize += item->BufferLength();
-	fTotalPadding += calc_padding(item->BufferLength() + 4, 8);
 
-	if (deleteOld)
-		delete oldItem;
+	fTotalSize -= ROUND_TO_8(oldItem->BufferLength());
+	fTotalSize += ROUND_TO_8(item->BufferLength());
+
+	delete oldItem;
 }
 
 
 void
-BMessageField::RemoveItem(int32 index, bool deleteIt)
+BMessageField::RemoveItem(int32 index)
 {
-	BMallocIO *item = (BMallocIO *)fItems.RemoveItem(index);
-
-	fTotalSize -= item->BufferLength();
-	fTotalPadding -= calc_padding(item->BufferLength() + 4, 8);
-	if (deleteIt)
-		delete item;
+	BSimpleMallocIO *item = (BSimpleMallocIO *)fItems.RemoveItem(index);
+	fTotalSize -= ROUND_TO_8(item->BufferLength());
+	delete item;
 }
 
 
 size_t
 BMessageField::SizeAt(int32 index) const
 {
-	BMallocIO *buffer = (BMallocIO *)fItems.ItemAt(index);
+	BSimpleMallocIO *buffer = (BSimpleMallocIO *)fItems.ItemAt(index);
 
 	if (buffer)
 		return buffer->BufferLength();
@@ -166,7 +157,7 @@ BMessageField::SizeAt(int32 index) const
 const void *
 BMessageField::BufferAt(int32 index) const
 {
-	BMallocIO *buffer = (BMallocIO *)fItems.ItemAt(index);
+	BSimpleMallocIO *buffer = (BSimpleMallocIO *)fItems.ItemAt(index);
 
 	if (buffer)
 		return buffer->Buffer();