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#pragma once
#include "file_reader.hpp"
#include "file_writer.hpp"
#include "../std/vector.hpp"
#include "../std/string.hpp"
class FilesContainerBase
{
protected:
typedef string Tag;
struct Info
{
Tag m_tag;
uint64_t m_offset;
uint64_t m_size;
Info() {}
Info(Tag const & tag, uint64_t offset) : m_tag(tag), m_offset(offset) {}
};
struct LessInfo
{
bool operator() (Info const & t1, Info const & t2) const
{
return (t1.m_tag < t2.m_tag);
}
bool operator() (Info const & t1, Tag const & t2) const
{
return (t1.m_tag < t2);
}
bool operator() (Tag const & t1, Info const & t2) const
{
return (t1 < t2.m_tag);
}
};
typedef vector<Info> InfoContainer;
InfoContainer m_info;
void ReadInfo(FileReader & reader);
};
class FilesContainerR : public FilesContainerBase
{
public:
explicit FilesContainerR(string const & fName,
uint32_t logPageSize = 10,
uint32_t logPageCount = 10);
FileReader GetReader(Tag const & tag) const;
template <typename F> void ForEachTag(F f) const
{
for (size_t i = 0; i < m_info.size(); ++i)
f(m_info[i].m_tag);
}
private:
FileReader m_source;
};
class FilesContainerW : public FilesContainerBase
{
public:
FilesContainerW(string const & fName,
FileWriter::Op op = FileWriter::OP_WRITE_TRUNCATE);
~FilesContainerW();
FileWriter GetWriter(Tag const & tag);
/// @todo Subclass from FileWriter to check write bounds (avoid overrun).
/// Return this object with additional check.
/// @precondition Container should be constructed with OP_WRITE_EXISTING.
FileWriter GetExistingWriter(Tag const & tag);
/// @name Append to existing container.
/// @precondition Container should be constructed with OP_APPEND.
//@{
void Append(string const & fName, Tag const & tag);
void Append(vector<char> const & buffer, Tag const & tag);
//@}
void Finish();
private:
uint64_t SaveCurrentSize();
string m_name;
bool m_bNeedRewrite;
bool m_bFinished;
};
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