Symaptic: os/ossrv/compressionlibs/ziplib/test/oldezlib/inc/OldEZGzip.h@bde4ae8d615e

     1 // Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 //

    16 #ifndef __EZLIB_GZIP_H__

    17 #define __EZLIB_GZIP_H__

    19 #include "OldEZDecompressor.h"

    20 #include "OldEZCompressor.h"

    21 #include "OldEZFilebuffer.h"

    24 namespace TOLDEZLIB

    25 {

    27 /**

    28 The TEZGZipHeader class encapsulates a zip file header, which is written to the start of the zip

    29 file to store various settings of the archive

    31 @publishedAll

    32 @released

    33 */

    34 class TEZGZipHeader

    35 	{

    37 public:

    38 	IMPORT_C TEZGZipHeader();

    39 	IMPORT_C ~TEZGZipHeader();

    41 public:

    42 	TUint8 iId1;

    43 	TUint8 iId2;

    44 	TUint8 iCompressionMethod;

    45 	TUint8 iFlags;

    46 	TInt32 iTime;

    47 	TUint8 iExtraFlags;

    48 	TUint8 iOs;

    49 	TInt16 iXlen;

    50 	HBufC8* iExtra;

    51 	HBufC8* iFname;

    52 	HBufC8* iComment;

    53 	TInt16 iCrc;

    54 	};

    56 /**

    57 The TEZGZipTrailer class encapsulates a zip file trailer, which uses a CRC (cyclic redundancy check) to

    58 confirm the validity of the unpacked archive

    60 @publishedAll

    61 @released

    62 */

    63 class TEZGZipTrailer

    64 	{

    65 public:

    66 	IMPORT_C TEZGZipTrailer();

    67 	IMPORT_C TEZGZipTrailer(TInt32 aCrc, TInt32 aSize);

    68 public:

    69 	TInt32 iCrc32;

    70 	TInt32 iSize;

    71 	};

    73 /**

    74 The EZGZipFile class handles writing / reading of headers and trailers to / from zip files

    76 @publishedAll

    77 @released

    78 */

    79 class EZGZipFile

    80 	{

    81 public:

    83 	/** Zip file error codes */

    84 	enum { 	ENotGZipFile = KEZlibErrNotGZipFile,

    85 			EInvalidCompressionMethod = KEZlibErrInvalidCompression,

    86 			EBadGZipHeader= KEZlibErrBadGZipHeader,

    87 			EBadGZipTrailer = KEZlibErrBadGZipTrailer,

    88 			EBadGZipCrc = KEZlibErrBadGZipCrc };

    89 	/** Flags to determine which part of the header / trailer is being written */

    90 	enum { EFText = 0, EFHcrc = 1, EFExtra = 2, EFName = 3, EFComment = 4};

    92 public:

    93 	IMPORT_C static void ReadHeaderL(RFile &aFile, TEZGZipHeader &aHeader);

    94 	IMPORT_C static void WriteHeaderL(RFile &aFile, TEZGZipHeader &aHeader);

    95 	IMPORT_C static void ReadTrailerL(RFile &aFile, TEZGZipTrailer &aTrailer);

    96 	IMPORT_C static void WriteTrailerL(RFile &aFile, TEZGZipTrailer &aTrailer);

    97 	IMPORT_C static void LocateAndReadTrailerL(RFs &aRfs, const TDesC &aFname, TEZGZipTrailer &aTrailer);

    98 	IMPORT_C static TBool IsGzipFile(RFs &aRfs, const TDesC &aFname);

    99 	IMPORT_C static TBool IsGzipFileL(RFs &aRfs, const TDesC &aFname);

   101 private:

   102 	static void ReadStringIntoDescriptorL(RFile &aFile, HBufC8 **aDes);

   104 public:

   105 	/** First of the header ID pair */

   106 	static const TUint8 ID1;

   107 	/** Second of the header ID pair */

   108 	static const TUint8 ID2;

   109 	};

   111 /**

   112 The CEZFileToGzipBM manages the input and output buffers for compression

   114 @publishedAll

   115 @released

   116 */

   117 NONSHARABLE_CLASS(CEZFileToGzipBM) : public CEZFileBufferManager

   118 	{

   119 public:

   121 	static CEZFileToGzipBM* NewLC(RFile &aInput, RFile &aOutput, TInt aBufferSize);

   122 	static CEZFileToGzipBM* NewL(RFile &aInput, RFile &aOutput, TInt aBufferSize);

   124 	/**

   125 	Initialise the stream with input and output buffers and starts reading

   127 	@param aZStream the stream to initialise

   128 	*/

   129 	virtual void InitializeL(CEZZStream &aZStream);

   131 	/**

   132 	Set the stream's input buffer and starts reading

   134 	@param aZStream the steam whose input buffer to set

   135 	*/

   136 	virtual void NeedInputL(CEZZStream &aZStream);

   138 	/**

   139 	Return the CRC - used for checking validity of the archive

   141 	@return the CRC value

   142 	*/

   143 	TInt32 Crc() const { return iCrc; } ;

   145 private:

   146 	CEZFileToGzipBM(RFile &aInput, RFile &aOutput);

   147 private:

   148 	TInt32 iCrc;

   149 	};

   151 /**

   152 The CEZGzipToFileBM class manages the input and output buffers for de-compression

   154 @publishedAll

   155 @released

   156 */

   157 NONSHARABLE_CLASS(CEZGzipToFileBM) : public CEZFileBufferManager

   158 	{

   159 public:

   161 	static CEZGzipToFileBM* NewLC(RFile &aInput, RFile &aOutput, TInt aBufferSize);

   162 	static CEZGzipToFileBM* NewL(RFile &aInput, RFile &aOutput, TInt aBufferSize);

   164 	/**

   165 	Finish writing to the stream

   167 	@param aZStream the stream to complete writing to

   168 	*/

   169 	virtual void FinalizeL(CEZZStream &aZStream);

   171 	/**

   172 	Set the stream's output buffer and start writing

   174 	@param aZStream the steam whose output buffer to set

   175 	*/

   176 	virtual void NeedOutputL(CEZZStream &aZStream);

   178 	/**

   179 	Return the CRC - used for checking validity of the archive

   181 	@return the CRC value

   182 	*/

   183 	TInt32 Crc() const { return iCrc; } ;

   185 private:

   186 	CEZGzipToFileBM(RFile &aInput, RFile &aOutput);

   187 private:

   188 	TInt32 iCrc;

   189 	};

   192 /**

   193 A CEZGZipToFile object allows de-compression of a compressed file.

   194 The name of the compressed file is passed into the constructor along with a target file

   195 to contain the uncompressed data.  The file is uncompressed by calling the InflateL() function.

   197 @publishedAll

   198 @released

   199 */

   200 class CEZGZipToFile : public CBase

   201 	{

   202 public:

   203 	~CEZGZipToFile();

   205 	IMPORT_C static CEZGZipToFile* NewLC(RFs &aRfs, const TDesC &aGzFileName, RFile &aOutput, TInt aBufferSize = 0x8000);

   206 	IMPORT_C static CEZGZipToFile* NewL(RFs &aRfs, const TDesC &aGzFileName, RFile &aOutput, TInt aBufferSize = 0x8000);

   208 	IMPORT_C void ResetL(RFs &aRfs, const TDesC &aGzFileName, RFile &aOutput, TInt aBufferSize = 0x8000);

   210 	IMPORT_C TBool InflateL();

   212 private:

   213 	CEZGZipToFile();

   214 	void ConstructL(RFs &aRfs, const TDesC &aGzFileName, RFile &aOutput, TInt aBufferSize);

   215 	void InitialiseBufManL(RFs &aRfs, const TDesC &aGzFileName, RFile &aOutput, TInt aBufferSize);

   216 private:

   217 	CEZDecompressor *iDecompressor;

   218 	CEZGzipToFileBM *iBufferManager;

   219 	TEZGZipTrailer iTrailer;

   220 	RFile iGZipFile;

   221 	TEZGZipHeader iHeader;

   222 	};

   224 /**

   225 A CEZFileToGZip object allows compression of an uncompressed file to a zip file.

   226 The uncompressed source file is passed into the constructor along with the name of the target

   227 zip file.  The file is compressed by calling the DeflateL() function.

   229 @publishedAll

   230 @released

   231 */

   232 class CEZFileToGZip : public CBase

   233 	{

   234 public:

   235 	~CEZFileToGZip();

   237 	IMPORT_C static CEZFileToGZip* NewLC(RFs &aRfs, const TDesC &aGzFileName, RFile &aInput, TInt aBufferSize = 0x8000);

   238 	IMPORT_C static CEZFileToGZip* NewL(RFs &aRfs, const TDesC &aGzFileName, RFile &aInput, TInt aBufferSize = 0x8000);

   240 	IMPORT_C void ResetL(RFs &aRfs, const TDesC &aGzFileName, RFile &aInput, TInt aBufferSize = 0x8000);

   242 	IMPORT_C TBool DeflateL();

   244 private:

   245 	CEZFileToGZip();

   246 	void ConstructL(RFs &aRfs, const TDesC &aGzFileName, RFile &aInput, TInt aBufferSize);

   247 	void InitialiseBufManL(RFs &aRfs, const TDesC &aGzFileName, RFile &aInput, TInt aBufferSize);

   248 private:

   249 	CEZCompressor *iCompressor;

   250 	CEZFileToGzipBM *iBufferManager;

   251 	TInt iUncompressedDataSize;

   252 	RFile iGZipFile;

   253 	TEZGZipHeader iHeader;

   254 	};

   256 }// namespace TOLDEZLIB

   257 #endif

author	sl@SLION-WIN7.fritz.box
	Fri, 15 Jun 2012 03:10:57 +0200
changeset 0	bde4ae8d615e
permissions	-rw-r--r--