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1 // Copyright (c) 1999-2009 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 "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 // |
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13 // Description: |
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14 // EZLib: DECOMPRESSOR.H |
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15 // Declaration for Decompression class |
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16 // |
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17 // |
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18 |
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19 #ifndef __EZLIB_EZDECOMPRESSOR_H__ |
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20 #define __EZLIB_EZDECOMPRESSOR_H__ |
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21 |
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22 #include <e32base.h> |
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23 #include "OldEZstream.h" |
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24 #include "OldEZBufman.h" |
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25 |
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26 /** |
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27 The CEZDecompressor class provides in-memory de-compression functions, including integrity checks of the compressed data. |
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28 This version of the library supports only one compression / de-compression method (deflation / inflation). De-compression |
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29 can be done in a single step (using DecompressL()) if the buffers are large enough (for example if an input file is mmap'ed), |
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30 or can be done by repeated calls of the InflateL() function. The source data is de-compressed to the target buffer (both source |
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31 and target contained within the buffer manager argument). |
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32 |
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33 @publishedAll |
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34 @released |
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35 */ |
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36 namespace TOLDEZLIB |
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37 { |
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38 |
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39 class CEZDecompressor : public CEZZStream |
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40 { |
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41 public: |
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42 /** Decompression panic values */ |
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43 enum |
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44 { |
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45 EInflateInitlialiserError = EUnexpected + 1, |
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46 EInflateVersionError, |
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47 EInflateTerminated, |
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48 EInflateDictionaryError |
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49 }; |
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50 |
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51 /** Window Bits - the base two logarithm of the window size (the size of the history buffer) */ |
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52 enum |
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53 { |
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54 EMaxWBits = MAX_WBITS |
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55 }; |
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56 |
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57 public: |
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58 ~CEZDecompressor(); |
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59 |
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60 IMPORT_C static CEZDecompressor* NewLC(MEZBufferManager& aInit, TInt aWindowBits = EMaxWBits); |
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61 IMPORT_C static CEZDecompressor* NewL(MEZBufferManager& aInit, TInt aWindowBits = EMaxWBits); |
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62 |
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63 IMPORT_C static CEZDecompressor* NewLC(MEZBufferManager& aInit, const TDesC8& aDictionary, TInt aWindowBits = EMaxWBits); |
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64 IMPORT_C static CEZDecompressor* NewL(MEZBufferManager& aInit, const TDesC8& aDictionary, TInt aWindowBits = EMaxWBits); |
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65 |
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66 |
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67 IMPORT_C void ResetL(MEZBufferManager& aInit); |
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68 IMPORT_C TBool InflateL(); |
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69 |
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70 IMPORT_C static void DecompressL(TDes8 &aDestination, const TDesC8 &aSource); |
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71 |
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72 private: |
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73 enum TInflationState |
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74 { |
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75 ENoFlush, |
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76 EFinalize, |
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77 ETerminated |
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78 }; |
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79 |
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80 private: |
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81 void SetDictionaryL(); |
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82 CEZDecompressor(MEZBufferManager* aInit); |
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83 CEZDecompressor(MEZBufferManager* aInit, const TUint8 *aDictionary, TInt aLength); |
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84 void ConstructL(TInt aWindowBits); |
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85 |
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86 private: |
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87 MEZBufferManager* iBufferInit; |
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88 TInflationState iInflationState; |
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89 const TUint8* iDictionary; |
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90 TInt iDictionaryLength; |
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91 }; |
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92 |
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93 } //namespace TOLDEZLIB |
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94 #endif |
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95 |
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96 |