80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
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#ifndef NXS_INDEX_FILE_H
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#define NXS_INDEX_FILE_H
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#include <assert.h>
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#include <vector>
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#include "mfile.h"
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namespace nxs {
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/* WARINING when subclassing this class you must add a Close()
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in the destructor! */
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template <class T>
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class IndexFile: public MFile, public std::vector<T> {
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public:
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virtual ~IndexFile() {}
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bool Create(const std::string &filename, unsigned int header_size,
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unsigned int max_file_size = MFILE_MAX_SIZE) {
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clear();
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if(!MFile::Create(filename, max_file_size)) return false;
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MFile::Redim(header_size);
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offset = header_size;
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return true;
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}
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bool Load(const std::string &filename, bool readonly = false) {
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clear();
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if(!MFile::Load(filename, readonly)) return false;
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SetPosition(0);
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LoadHeader();
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SetPosition(offset);
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unsigned int tot;
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ReadBuffer(&tot, sizeof(unsigned int));
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resize(tot);
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ReadBuffer(&*begin(), size() * sizeof(T));
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return true;
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}
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void Close() {
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if(IsReadOnly()) return;
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if(files.size() == 0) return; //not loaded, not created or closed
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MFile::Redim(offset + size() * sizeof(T));
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SetPosition(offset);
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unsigned int tot = size();
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WriteBuffer(&tot, sizeof(unsigned int));
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WriteBuffer(&*begin(), size() * sizeof(T));
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SetPosition(0);
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SaveHeader();
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MFile::Close();
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}
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int64 Length() { //count the header but not the index...
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return offset;
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}
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void Redim(int64 size) {
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MFile::Redim(size);
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offset = size;
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assert(MFile::Length() == offset);
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}
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protected:
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int64 offset;
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//MUST set offset to its correct value
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virtual bool LoadHeader() = 0;
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//MUST save offset somewhere
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virtual void SaveHeader() = 0;
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};
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} //namespace
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#endif
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