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1 // Copyright (c) 1995-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of the License "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // Accenture - minor tweaks to build in to fshell chkdeps command |
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13 // |
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14 // Description: |
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15 // f32\sfile\sf_pgcompr.h |
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16 // |
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17 // |
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18 |
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19 #ifndef __SF_PGCOMPR_H__ |
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20 #define __SF_PGCOMPR_H__ |
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21 |
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22 #include <e32base.h> |
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23 #include<f32file.h> |
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24 //#include "sf_std.h" |
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25 #include <f32image.h> |
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26 //#include "sf_image.h" |
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27 #include <e32uid.h> |
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28 #include <e32rom.h> |
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29 //#include "sf_cache.h" |
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30 |
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31 |
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32 const TUint KBytePairPageSize = 4096; |
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33 |
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34 // Buffer sized for at least 8 compressed pages - a noncompressible page is one byte larger |
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35 const TUint KReadNumberOfPages = 8; |
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36 const TUint KPagesBufferSize = (KBytePairPageSize + 1) * KReadNumberOfPages; |
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37 |
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38 typedef TUint8* (*TMemoryMoveFunction)(TAny* aTrg,const TAny* aSrc,TInt aLength); |
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39 |
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40 struct IndexTableHeader |
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41 { |
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42 TInt iSizeOfData; // Includes the index and compressed pages |
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43 TInt iDecompressedSize; |
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44 TUint16 iNumberOfPages; |
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45 }; |
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46 |
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47 // sizeof(IndexTableHeader) returns the wrong value due to rounding/padding, so calculate it |
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48 const TUint KIndexTableHeaderSize = sizeof(TInt) + sizeof(TInt) + sizeof(TUint16); |
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49 |
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50 NONSHARABLE_CLASS(CBytePairReader) : public CBase |
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51 { |
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52 public: |
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53 static CBytePairReader* NewLC(TUint8* aBuffer, TUint32 aLength); |
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54 CBytePairReader(TUint8* aBuffer, TUint32 aLength); |
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55 |
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56 virtual TUint DecompressPagesL(TUint8* aTarget, TInt aLength, TMemoryMoveFunction aMemMoveFn); |
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57 void GetPageOffsetsL(TInt32 aInitialOffset, TInt& aPageCount, TInt32*& aPageStarts); |
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58 TUint GetPageL(TUint aPageNum, TUint8* aTarget, TInt aLength, TMemoryMoveFunction aMemMoveFn); |
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59 virtual void SeekForwardL(TUint aBytes); |
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60 |
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61 protected: |
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62 virtual void ReadInTableL(); |
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63 void ReleaseTable(); |
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64 |
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65 IndexTableHeader iHeader; |
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66 TUint16* iIndexTable; |
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67 TUint8* iNextPage; |
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68 TUint iBytesLeft; |
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69 TUint8 iPageBuf[KBytePairPageSize]; |
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70 }; |
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71 |
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72 NONSHARABLE_CLASS(CBytePairFileReader) : public CBytePairReader |
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73 { |
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74 public: |
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75 static CBytePairFileReader* NewLC(RFile& aFile); |
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76 CBytePairFileReader(RFile& aFile); |
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77 ~CBytePairFileReader(); |
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78 |
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79 virtual TUint DecompressPagesL(TUint8* aTarget, TInt aLength, TMemoryMoveFunction aMemMovefn); |
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80 virtual void SeekForwardL(TUint aBytes); |
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81 |
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82 protected: |
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83 virtual void ReadInTableL(); |
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84 |
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85 RFile& iFile; |
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86 TUint8 iBuffer[KPagesBufferSize]; |
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87 }; |
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88 |
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89 #endif // __SF_PGCOMPR_H__ |