souffle::gzfstream::internal::gzfstreambuf Class Reference

#include <gzfstream.h>

Inheritance diagram for souffle::gzfstream::internal::gzfstreambuf:

Collaboration diagram for souffle::gzfstream::internal::gzfstreambuf:

Public Member Functions
gzfstreambuf *	close ()
	gzfstreambuf ()
	gzfstreambuf (const gzfstreambuf &)=delete
	gzfstreambuf (gzfstreambuf &&old)=default
bool	is_open () const
gzfstreambuf *	open (const std::string &filename, std::ios_base::openmode mode)
	~gzfstreambuf () override

Protected Member Functions
int_type	overflow (int c=EOF) override
int	sync () override
int_type	underflow () override

Private Attributes
char	buffer [bufferSize] = {}
gzFile	fileHandle = {}
bool	isOpen = false
std::ios_base::openmode	mode = std::ios_base::in

Static Private Attributes
static constexpr unsigned int	bufferSize = 65536
static constexpr unsigned int	reserveSize = 16

Detailed Description

Definition at line 45 of file gzfstream.h.

Constructor & Destructor Documentation

gzfstreambuf() [1/3]

souffle::gzfstream::internal::gzfstreambuf::gzfstreambuf ( )

inline

Definition at line 52 of file gzfstream.h.

                                   {
            return nullptr;
        }

gzfstreambuf() [2/3]

souffle::gzfstream::internal::gzfstreambuf::gzfstreambuf ( const gzfstreambuf &  )

delete

gzfstreambuf() [3/3]

souffle::gzfstream::internal::gzfstreambuf::gzfstreambuf ( gzfstreambuf &&  old )

default

~gzfstreambuf()

souffle::gzfstream::internal::gzfstreambuf::~gzfstreambuf ( )

inlineoverride

Definition at line 96 of file gzfstream.h.

                                  {

Member Function Documentation

close()

gzfstreambuf* souffle::gzfstream::internal::gzfstreambuf::close ( )

inline

Definition at line 81 of file gzfstream.h.

         :
    int_type overflow(int c = EOF) override {
        if (((mode & std::ios::out) == 0) || !isOpen) {
            return EOF;
        }
 
        if (c != EOF) {

is_open()

bool souffle::gzfstream::internal::gzfstreambuf::is_open ( ) const

inline

Definition at line 92 of file gzfstream.h.

                                                              {

Referenced by open().

open()

gzfstreambuf* souffle::gzfstream::internal::gzfstreambuf::open ( const std::string &  filename, std::ios_base::openmode  mode  )

inline

Definition at line 61 of file gzfstream.h.

                          {
        if (is_open()) {
            sync();
            isOpen = false;
            if (gzclose(fileHandle) == Z_OK) {
                return this;
            }
        }
        return nullptr;
    }
 
    bool is_open() const {
        return isOpen;
    }
 
    ~gzfstreambuf() override {
        try {
            close();
        } catch (...) {

References fileHandle, is_open(), isOpen, and sync().

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overflow()

int_type souffle::gzfstream::internal::gzfstreambuf::overflow ( int  c = EOF )

inlineoverrideprotected

Definition at line 105 of file gzfstream.h.

                                                       {
            return traits_type::to_int_type(*gptr());
        }
 
        unsigned charsPutBack = gptr() - eback();
        if (charsPutBack > reserveSize) {
            charsPutBack = reserveSize;
        }
        memcpy(buffer + reserveSize - charsPutBack, gptr() - charsPutBack, charsPutBack);
 
        int charsRead = gzread(fileHandle, buffer + reserveSize, bufferSize - reserveSize);
        if (charsRead <= 0) {
            return EOF;
        }
 

sync()

int souffle::gzfstream::internal::gzfstreambuf::sync ( )

inlineoverrideprotected

Definition at line 147 of file gzfstream.h.

                : virtual public std::ios {
public:
    gzfstream() {
        init(&buf);
    }
 
    gzfstream(const std::string& filename, std::ios_base::openmode mode) {
        init(&buf);
        open(filename, mode);

References souffle::gzfstream::internal::gzfstream::buf, souffle::gzfstream::internal::gzfstream::gzfstream(), and souffle::gzfstream::internal::gzfstream::open().

Referenced by open().

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underflow()

int_type souffle::gzfstream::internal::gzfstreambuf::underflow ( )

inlineoverrideprotected

Definition at line 123 of file gzfstream.h.

                        {
        if ((pptr() != nullptr) && pptr() > pbase()) {
            int toWrite = pptr() - pbase();
            if (gzwrite(fileHandle, pbase(), toWrite) != toWrite) {
                return -1;
            }
            pbump(-toWrite);
        }
        return 0;
    }
 
private:
    static constexpr unsigned int bufferSize = 65536;
    static constexpr unsigned int reserveSize = 16;
 
    char buffer[bufferSize] = {};
    gzFile fileHandle = {};
    bool isOpen = false;
    std::ios_base::openmode mode = std::ios_base::in;

Field Documentation

buffer

char souffle::gzfstream::internal::gzfstreambuf::buffer[bufferSize] = {}

private

Definition at line 162 of file gzfstream.h.

bufferSize

constexpr unsigned int souffle::gzfstream::internal::gzfstreambuf::bufferSize = 65536

staticconstexprprivate

Definition at line 159 of file gzfstream.h.

fileHandle

gzFile souffle::gzfstream::internal::gzfstreambuf::fileHandle = {}

private

Definition at line 163 of file gzfstream.h.

Referenced by open().

isOpen

bool souffle::gzfstream::internal::gzfstreambuf::isOpen = false

private

Definition at line 164 of file gzfstream.h.

Referenced by open().

mode

std::ios_base::openmode souffle::gzfstream::internal::gzfstreambuf::mode = std::ios_base::in

private

Definition at line 165 of file gzfstream.h.

reserveSize

constexpr unsigned int souffle::gzfstream::internal::gzfstreambuf::reserveSize = 16

staticconstexprprivate

Definition at line 160 of file gzfstream.h.

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The documentation for this class was generated from the following file:

• include/souffle/io/gzfstream.h