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#pragma once
#include "coding/file_reader.hpp"
#include "coding/file_writer.hpp"
#include "std/vector.hpp"
#include "std/string.hpp"
#include "std/noncopyable.hpp"
class FilesContainerBase
{
public:
typedef string Tag;
/// Alignment of each new section that will be added to a file
/// container, i.e. section's offset in bytes will be a multiple of
/// this value.
///
/// WARNING! Existing sections may not be properly aligned.
static uint64_t const kSectionAlignment = 8;
bool IsExist(Tag const & tag) const
{
return GetInfo(tag) != 0;
}
protected:
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) {}
};
friend string DebugPrint(Info const & info);
Info const * GetInfo(Tag const & tag) const;
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);
}
};
struct LessOffset
{
bool operator() (Info const & t1, Info const & t2) const
{
if (t1.m_offset == t2.m_offset)
{
// Element with nonzero size should be the last one,
// for correct append writer mode (FilesContainerW::GetWriter).
return (t1.m_size < t2.m_size);
}
else
return (t1.m_offset < t2.m_offset);
}
bool operator() (Info const & t1, uint64_t const & t2) const
{
return (t1.m_offset < t2);
}
bool operator() (uint64_t const & t1, Info const & t2) const
{
return (t1 < t2.m_offset);
}
};
class EqualTag
{
Tag const & m_tag;
public:
EqualTag(Tag const & tag) : m_tag(tag) {}
bool operator() (Info const & t) const
{
return (t.m_tag == m_tag);
}
};
typedef vector<Info> InfoContainer;
InfoContainer m_info;
template <class ReaderT>
void ReadInfo(ReaderT & reader);
public:
template <class ToDo> void ForEachTag(ToDo toDo) const
{
for_each(m_info.begin(), m_info.end(), toDo);
}
};
class FilesContainerR : public FilesContainerBase
{
public:
typedef ModelReaderPtr ReaderT;
explicit FilesContainerR(string const & filePath,
uint32_t logPageSize = 10,
uint32_t logPageCount = 10);
explicit FilesContainerR(ReaderT const & file);
ReaderT 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);
}
inline uint64_t GetFileSize() const { return m_source.Size(); }
inline string const & GetFileName() const { return m_source.GetName(); }
pair<uint64_t, uint64_t> GetAbsoluteOffsetAndSize(Tag const & tag) const;
private:
ReaderT m_source;
};
namespace detail
{
class MappedFile
{
DISALLOW_COPY(MappedFile);
public:
MappedFile() = default;
~MappedFile() { Close(); }
void Open(string const & fName);
void Close();
class Handle
{
DISALLOW_COPY(Handle);
void Reset();
public:
Handle()
: m_base(0), m_origBase(0), m_size(0), m_origSize(0)
{
}
Handle(char const * base, char const * alignBase, uint64_t size, uint64_t origSize)
: m_base(base), m_origBase(alignBase), m_size(size), m_origSize(origSize)
{
}
Handle(Handle && h) : Handle()
{
Assign(move(h));
}
~Handle();
void Assign(Handle && h);
void Unmap();
bool IsValid() const { return (m_base != 0); }
uint64_t GetSize() const { return m_size; }
template <class T> T const * GetData() const
{
ASSERT_EQUAL(m_size % sizeof(T), 0, ());
return reinterpret_cast<T const *>(m_base);
}
template <class T> size_t GetDataCount() const
{
ASSERT_EQUAL(m_size % sizeof(T), 0, ());
return (m_size / sizeof(T));
}
private:
char const * m_base;
char const * m_origBase;
uint64_t m_size;
uint64_t m_origSize;
};
Handle Map(uint64_t off, uint64_t size, string const & tag) const;
private:
#ifdef OMIM_OS_WINDOWS
void * m_hFile = (void *)-1;
void * m_hMapping = (void *)-1;
#else
int m_fd = -1;
#endif
};
}
class FilesMappingContainer : public FilesContainerBase
{
public:
/// Do nothing by default, call Open to attach to file.
FilesMappingContainer() = default;
explicit FilesMappingContainer(string const & fName);
~FilesMappingContainer();
void Open(string const & fName);
void Close();
typedef detail::MappedFile::Handle Handle;
Handle Map(Tag const & tag) const;
FileReader GetReader(Tag const & tag) const;
string const & GetName() const { return m_name; }
private:
string m_name;
detail::MappedFile m_file;
};
class FilesContainerW : public FilesContainerBase
{
public:
FilesContainerW(string const & fName,
FileWriter::Op op = FileWriter::OP_WRITE_TRUNCATE);
~FilesContainerW();
FileWriter GetWriter(Tag const & tag);
void Write(string const & fPath, Tag const & tag);
void Write(ModelReaderPtr reader, Tag const & tag);
void Write(vector<char> const & buffer, Tag const & tag);
void Finish();
/// Delete section with rewriting file.
/// @precondition Container should be opened with FileWriter::OP_WRITE_EXISTING.
void DeleteSection(Tag const & tag);
inline string const & GetFileName() const { return m_name; }
private:
uint64_t SaveCurrentSize();
void Open(FileWriter::Op op);
void StartNew();
string m_name;
bool m_bNeedRewrite;
bool m_bFinished;
};
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