author | Pat Downey <patd@symbian.org> |
Wed, 01 Sep 2010 12:28:30 +0100 | |
branch | RCL_3 |
changeset 94 | 919f36ff910f |
parent 93 | 79859ed3eea9 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2000 - 2001 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of the License "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* |
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*/ |
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/** ----------------------------------------------------------------------- ** |
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@package: NW_TinyTree |
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@synopsis: default |
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@description: default |
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** ----------------------------------------------------------------------- **/ |
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#ifndef NW_TINYTREE_EBUFFER_H |
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#define NW_TINYTREE_EBUFFER_H |
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#include <cxml_proj.h> |
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#ifdef __cplusplus |
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extern "C" { |
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#endif /* __cplusplus */ |
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/* ----------------------------------------------------------------------- ** |
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EBuffers (expandable buffers) provide storage blocks of bytes that |
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can be accessed by index. Tiny trees use these to store serialized |
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tree data. Node source offsets are stored as ebuffer indexes. EBuffers |
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are similar to segmented vectors, but with variable segment sizes so |
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that continuous byte blocks of different sizes can be stored efficiently. |
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Unlike vectors, EBuffers store only byte data, so alignment calculations |
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are not needed. Also, EBuffers support appending, but not insertion and |
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deletion. These simplifications make it much easier to deal with |
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variable segment sizes while guaranteeing that continuous blocks remain |
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continuous. |
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** ----------------------------------------------------------------------- **/ |
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/* ------------------------------------------------------------------------- */ |
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#define NW_TINY_TREE_BLOCK_SIZE_DEFAULT ((CXML_Vector_Metric_t) 256) |
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/** ----------------------------------------------------------------------- ** |
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@struct: NW_TinyTree_Segment |
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@synopsis: Tiny tree data segment. |
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@scope: public |
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@variables: |
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NW_Uint8* storage |
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Data storage. |
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CXML_Vector_Metric_t segmentSize |
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Size of segment. |
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CXML_Vector_Metric_t freeOffset |
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Free offset. |
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@description: Tiny tree data segment. |
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** ----------------------------------------------------------------------- **/ |
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typedef struct NW_TinyTree_Segment_s { |
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NW_Uint8* storage; |
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NW_TinyTree_Offset_t segmentSize; |
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NW_TinyTree_Offset_t freeOffset; |
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} NW_TinyTree_Segment_t; |
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/** ----------------------------------------------------------------------- ** |
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@struct: NW_TinyTree_EBuffer |
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@synopsis: Tiny tree E buffer. |
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@scope: public |
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@variables: |
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NW_Bool ownFirstBlock |
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Ownership flag. |
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CXML_Vector_Metric_t blockSize |
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Size of block, |
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NW_TinyTree_Segment_t* segmentList |
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List of segments. |
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CXML_Vector_Metric_t segmentListSize |
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Size of segment list. |
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CXML_Vector_Metric_t numSegments |
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Number of segments. |
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@description: EBuffers (expandable buffers) provide storage blocks |
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of bytes that can be accessed by index. Tiny trees use |
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these to store serialized tree data. Node source |
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offsets are stored as ebuffer indexes. EBuffers are |
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similar to segmented vectors, but with variable |
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segment sizes so that continuous byte blocks of |
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different sizes can be stored efficiently. Unlike |
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vectors, EBuffers store only byte data, so alignment |
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calculations are not needed. Also, EBuffers support |
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appending, but not insertion and deletion. These |
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simplifications make it much easier to deal with |
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variable segment sizes while guaranteeing that |
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continuous blocks remain continuous. |
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** ----------------------------------------------------------------------- **/ |
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typedef struct NW_TinyTree_EBuffer_s { |
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NW_Bool ownFirstBlock; |
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CXML_Vector_Metric_t blockSize; |
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NW_TinyTree_Segment_t* segmentList; |
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CXML_Vector_Metric_t segmentListSize; |
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CXML_Vector_Metric_t numSegments; |
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} NW_TinyTree_EBuffer_t; |
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/* ------------------------------------------------------------------------- * |
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public methods |
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* ------------------------------------------------------------------------- */ |
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NW_TinyTree_EBuffer_t* |
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NW_TinyTree_EBuffer_Construct (NW_Uint8* initialBuffer, |
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NW_TinyTree_Offset_t initBuffSize, |
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NW_TinyTree_Offset_t blockSize, |
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NW_Bool freeBuff); |
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void |
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NW_TinyTree_EBuffer_Destruct (NW_TinyTree_EBuffer_t* thisObj); |
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extern |
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NW_Uint8* |
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NW_TinyTree_EBuffer_GetWritableBlock(NW_TinyTree_EBuffer_t* ebuffer, |
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NW_TinyTree_Offset_t size, |
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NW_TinyTree_Offset_t* index); |
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extern |
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NW_Status_t |
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NW_TinyTree_EBuffer_GetSegmentAndOffset(NW_TinyTree_EBuffer_t* ebuffer, |
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NW_TinyTree_Offset_t index, |
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NW_Uint8** segment, /* OUT */ |
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NW_TinyTree_Offset_t* segSize, /* OUT */ |
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NW_TinyTree_Offset_t* offset); /* OUT */ |
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extern |
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NW_Status_t |
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NW_TinyTree_EBuffer_GetIndex(NW_TinyTree_EBuffer_t* ebuffer, |
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NW_Uint8* segmentAddr, |
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NW_TinyTree_Offset_t offset, |
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NW_TinyTree_Offset_t * index); /* OUT */ |
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extern |
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NW_Uint8* |
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NW_TinyTree_EBuffer_AddressAt(NW_TinyTree_EBuffer_t* ebuffer, |
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NW_TinyTree_Offset_t index); |
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#ifdef __cplusplus |
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} /* extern "C" { */ |
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#endif /* __cplusplus */ |
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#endif /* NW_TINYTREE_EBUFFER_H */ |