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112 lines
4.3 KiB
112 lines
4.3 KiB
14 years ago
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/*==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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