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111 lines
4.7 KiB
111 lines
4.7 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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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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// plBSDiffBuffer - 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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// that will modify an old data buffer to match a new one. |
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// It's a useful utility class when doing binary file |
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// patching, for example, as you can write out the changes |
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// to this class, get back a data buffer suitable for writing, |
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// then use this class again later to reconstruct the new buffer. |
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// |
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// This class is copied in structure (not substance) from |
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// plDiffBuffer. It is based on bsdiff-4.1 from BSD |
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// Linux (http://www.daemonology.org/bsdiff). It's *extremely* |
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// hard to read code (written by a PhD), but it works well. The |
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// original BSD code has been modified to have the bzip2 pipes |
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// it used to compress data removed. It has also been converted |
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// to work a C++ utility class. |
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// |
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// There isn't really an Add or Copy command in bsdiff. It just |
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// uses three control numbers and two diff/data buffers. |
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// |
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////////////////////////////////////////////////////////////////////////////// |
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#ifndef _plBSDiffBuffer_h |
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#define _plBSDiffBuffer_h |
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#include "hsTypes.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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{ |
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protected: |
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hsBool fWriting; |
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UInt32 fNewLength, fPatchLength; |
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unsigned char* fPatchBuffer; |
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public: |
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plBSDiffBuffer( UInt32 newLength, UInt32 oldLength = 0 ); // Constructor for writing new buffers. oldLength isn't required but helpful for optimizations |
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plBSDiffBuffer( void *buffer, UInt32 length ); // Constructor for applying a given diff set |
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// to an old buffer |
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virtual ~plBSDiffBuffer(); |
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/// Creation/write functions |
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// Diff() creates the diff buffer from the new and old. |
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UInt32 Diff( UInt32 oldLength, void *oldBuffer, UInt32 newLength, void *newBuffer ); |
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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 &length, void *&bufferPtr ); |
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/// Apply functions |
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// Apply() is another way to call Patch(). |
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UInt32 Apply( UInt32 oldLength, void *oldBuffer, UInt32 &newLength, void *&newBuffer ) |
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{ return Patch(oldLength, oldBuffer, newLength, newBuffer); }; |
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// Patch() will take this diff buffer and apply it to the given old buffer, |
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// allocating and producing a new buffer. You are responsible for freeing the new buffer. |
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UInt32 Patch( UInt32 oldLength, void *oldBuffer, UInt32 &newLength, void *&newBuffer ); |
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private: |
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UInt32 IReadUnsignedInt8(unsigned char *buf); |
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void IWriteUnsignedInt8(UInt32 x,unsigned char *buf); |
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void ISafeMemcpy(unsigned char *dest, unsigned char *src, size_t nbytes, |
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unsigned char *destend, unsigned char *srcend); |
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void ISplit(Int32 *I,Int32 *V,UInt32 start,UInt32 len,UInt32 h); |
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void IQSuffixSort(Int32 *I,Int32 *V,unsigned char *old,UInt32 oldsize); |
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UInt32 IMatchLen( unsigned char *oldBuffer, UInt32 oldLength, |
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unsigned char *newBuffer, UInt32 newLength); |
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UInt32 ISearch( Int32 *I, |
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unsigned char *oldBuffer, UInt32 oldLength, |
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unsigned char *newBuffer, UInt32 newLength, |
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UInt32 st, UInt32 en, Int32 *pos); |
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}; |
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#endif // _plBSDiffBuffer_h
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