121 lines
2.7 KiB
C++
121 lines
2.7 KiB
C++
/*
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* Copyright 2005, Haiku.
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* Distributed under the terms of the MIT License.
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*
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* Authors:
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* Michael Lotz <mmlr@mlotz.ch>
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*/
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/* BMessageField contains the data for indiviual named fields in BMessageBody */
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#ifndef _MESSAGE_FIELD_H_
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#define _MESSAGE_FIELD_H_
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#include <List.h>
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#include <String.h>
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#include <SupportDefs.h>
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#include "MessageBody3.h"
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// we only support those
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#define MSG_FLAG_VALID 0x01
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#define MSG_FLAG_FIXED_SIZE 0x04
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#define MSG_FLAG_ALL 0x05
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// these are for R5 compatibility
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#define MSG_FLAG_MINI_DATA 0x02
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#define MSG_FLAG_SINGLE_ITEM 0x08
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#define MSG_LAST_ENTRY 0x00
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namespace BPrivate {
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struct field_header_s {
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uint8 flags;
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type_code type;
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int32 count;
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ssize_t dataSize;
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uint8 nameLength;
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} __attribute__((__packed__));
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struct item_info_s {
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item_info_s(int32 _offset)
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: offset(_offset)
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{
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}
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item_info_s(int32 _offset, int32 _length)
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: offset(_offset),
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length(_length)
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{
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}
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int32 offset;
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int32 length;
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int32 paddedLength;
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};
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typedef field_header_s FieldHeader;
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typedef item_info_s ItemInfo;
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class BMessageField {
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public:
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BMessageField(BMessageBody *parent,
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int32 offset, const char *name,
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type_code type);
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// only use this constructor to unflatten
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BMessageField(BMessageBody *parent);
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int32 Unflatten(int32 offset);
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uint8 Flags() const { return Header()->flags; };
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status_t SetFixedSize(int32 itemSize);
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bool FixedSize() const { return fFixedSize; };
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void SetName(const char *newName);
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const char *Name() const;
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uint8 NameLength() const { return Header()->nameLength; };
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type_code Type() const { return Header()->type; };
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void AddItem(const void *item, ssize_t length);
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uint8 *AddItem(ssize_t length);
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void ReplaceItem(int32 index, const void *newItem,
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ssize_t length);
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uint8 *ReplaceItem(int32 index, ssize_t length);
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void *ItemAt(int32 index, ssize_t *size);
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void RemoveItem(int32 index);
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int32 CountItems() const { return Header()->count; };
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void PrintToStream() const;
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void SetOffset(int32 offset) { fOffset = offset; };
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int32 Offset() const { return fOffset; };
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// always do MakeEmpty -> RemoveSelf -> delete
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void MakeEmpty();
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void RemoveSelf();
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// hash table support
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void SetNext(BMessageField *next) { fNext = next; };
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BMessageField *Next() const { return fNext; };
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private:
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inline FieldHeader *Header() const { return (FieldHeader *)(fParent->FlatBuffer() + fOffset); };
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BMessageBody *fParent;
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int32 fOffset;
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int32 fDataOffset;
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bool fFixedSize;
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int32 fItemSize;
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BList fItemInfos;
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BMessageField *fNext;
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};
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} // namespace BPrivate
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#endif // _MESSAGE_FIELD_H_
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