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//---------------------------------------------------------------------------
// ChunkedFile.h
//---------------------------------------------------------------------------
// -=* VPatch *=-
//---------------------------------------------------------------------------
// Copyright (C) 2001-2005 Koen van de Sande / Van de Sande Productions
//---------------------------------------------------------------------------
// Website: http://www.tibed.net/vpatch
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
// 3. This notice may not be removed or altered from any source distribution.
//
// Reviewed for Unicode support by Jim Park -- 08/29/2007
#if !defined(ChunkedFile_H)
#define ChunkedFile_H
#include "GlobalTypes.h"
#include "adler32.h"
#include <iostream>
#include <algorithm>
// private data type: the data tree information
typedef struct TChunkChecksum {
Checksum::uLong adler32;
CHECKSUM_BLOCK v;
} TChunkChecksum;
inline bool operator<(const TChunkChecksum& a, const TChunkChecksum& b) {
return (a.adler32 < b.adler32) ? true : (
(a.adler32 == b.adler32) ? (a.v < b.v) : false
);
}
inline bool operator==(const TChunkChecksum& a, const TChunkChecksum& b) {
return (a.v == b.v) && (a.adler32 == b.adler32);
}
typedef struct FileChunk {
TFileOffset offset;
TChunkChecksum checksum;
} FileChunk;
inline bool operator<(const FileChunk& a, const FileChunk& b) {
return a.checksum < b.checksum;
}
class ChunkedFile {
public:
TFileOffset chunkCount;
FileChunk* chunks;
ChunkedFile(bistream& f, TFileOffset fSize, TFileOffset chunkSize);
~ChunkedFile() {
if(chunks != NULL) delete[] chunks;
}
bool search(TChunkChecksum key, TFileOffset* start);
inline void calculateChecksum(unsigned char* data, TFileOffset size, TChunkChecksum& K) {
K.v = *reinterpret_cast<CHECKSUM_BLOCK*>(data);
K.adler32 = Checksum::adler32(1L,data,size);
}
};
#endif // ChunkedFile_H
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