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119 lines
5.0 KiB
119 lines
5.0 KiB
/*==LICENSE==* |
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CyanWorlds.com Engine - MMOG client, server and tools |
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Copyright (C) 2011 Cyan Worlds, Inc. |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation, either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>. |
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Additional permissions under GNU GPL version 3 section 7 |
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If you modify this Program, or any covered work, by linking or |
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combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK, |
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NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent |
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JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK |
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(or a modified version of those libraries), |
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containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA, |
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PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG |
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JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the |
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licensors of this Program grant you additional |
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permission to convey the resulting work. Corresponding Source for a |
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non-source form of such a combination shall include the source code for |
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the parts of OpenSSL and IJG JPEG Library used as well as that of the covered |
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work. |
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You can contact Cyan Worlds, Inc. by email legal@cyan.com |
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or by snail mail at: |
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Cyan Worlds, Inc. |
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14617 N Newport Hwy |
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Mead, WA 99021 |
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*==LICENSE==*/ |
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////////////////////////////////////////////////////////////////////////////// |
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// |
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// plDiffBuffer - A utility class for writing and applying a difference |
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// buffer--i.e. a buffer containing a series of modifications |
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// (specifically, adds and copys) that will modify an old |
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// data buffer to match a new one. It's a useful utility |
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// class when doing binary file patching, for example, as you |
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// can write out the changes to this class, get back a data |
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// buffer suitable for writing, then use this class again |
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// later to reconstruct the new buffer. |
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// |
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// This class is meant to construct diff buffers using two |
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// ops: add and copy. Basically, the syntax is defined so |
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// that to reconstruct the new buffer, you run through the |
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// list of ops sequentially, each one defining the next |
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// chunk of data in the new buffer. Add ops will add new data |
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// to the buffer that didn't exist in the old buffer, and |
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// copy ops will copy data that existed in the old buffer |
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// (from an arbitrary offset, to facilitate encoding data |
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// shuffling). Delete ops are implicit, as they simply aren't |
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// defined in the stream of ops. |
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// |
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//// History ///////////////////////////////////////////////////////////////// |
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// |
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// 7.24.2002 mcn - Created (Happy late b-day to me!) |
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// |
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////////////////////////////////////////////////////////////////////////////// |
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#ifndef _plDiffBuffer_h |
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#define _plDiffBuffer_h |
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#include "HeadSpin.h" |
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#include "hsStream.h" |
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//// Class Definition //////////////////////////////////////////////////////// |
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class hsRAMStream; |
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class plBSDiffBuffer; |
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class plDiffBuffer |
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{ |
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protected: |
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bool fWriting, f16BitMode; |
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uint32_t fNewLength; |
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hsRAMStream *fStream; |
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// Support for BSDiff patch buffers (Patching only) |
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plBSDiffBuffer *fBSDiffBuffer; |
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bool fIsBSDiff; |
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public: |
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plDiffBuffer( uint32_t newLength, uint32_t oldLength = 0 ); // Constructor for writing new buffers. oldLength isn't required but helpful for optimizations |
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plDiffBuffer( void *buffer, uint32_t length ); // Constructor for applying a given diff set |
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// to an old buffer |
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virtual ~plDiffBuffer(); |
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/// Creation/write functions |
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// Add() appends an Add-New-Data operation to the diff buffer. The data supplied will be copied internally. |
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void Add( int32_t length, void *newData ); |
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// Copy() appends a Copy-Data-From-Old operation to the diff buffer |
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void Copy( int32_t length, uint32_t oldOffset ); |
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// GetBuffer() will copy the diff stream into a new buffer and return it. You are responsible for freeing the buffer. |
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void GetBuffer( uint32_t &length, void *&bufferPtr ); |
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/// Apply functions |
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// Apply() will take this diff buffer and apply it to the given old buffer, allocating and producing a new buffer. You are responsible for freeing the new buffer. |
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void Apply( uint32_t oldLength, void *oldBuffer, uint32_t &newLength, void *&newBuffer ); |
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}; |
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#endif // _plDiffBuffer_h
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