file.h

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// Evo C++ Library
/* Copyright 2019 Justin Crowell
Distributed under the BSD 2-Clause License -- see included file LICENSE.txt for details.
*/

#pragma once
#ifndef INCL_evo_file_h
#define INCL_evo_file_h

#include "iobase.h"

// Namespace: evo
namespace evo {



class File : public Stream<IoFile> {
public:
    typedef Stream<IoFile> Base;    

    File(Newline nl=NL_SYS, bool exceptions=EVO_EXCEPTIONS) : Base(nl)
        { excep(exceptions); }

    File(const char* path, Open mode=oREAD, bool flushlines=false, Newline nl=NL_SYS, bool exceptions=EVO_EXCEPTIONS) : Base(nl)
        { excep(exceptions); open(path, mode, flushlines); }

    File(const char* path, Open mode, Newline nl, bool exceptions=EVO_EXCEPTIONS) : Base(nl)
        { excep(exceptions); open(path, mode, false); }

    bool open(const char* path, Open mode=oREAD, bool flushlines=false) {
        const bool result = ((error_=device_.open(path, mode)) == ENone);
        if (result) {
            Base::init(mode, flushlines);
            owned_ = true;
        } else if (excep_ && error_ != ENone) {
            EVO_THROW_ERR(evo::ExceptionFileOpen, "File::open() failed", error_);
        }
        return result;
    }

    ulongl pos() {
        assert( bufrd_.curbuf_offset <= bufrd_.readbuf.used );
        if (savepos_ > 0)
            return device_.pos(error_) + bufwr_.used;
        return device_.pos(error_) - (bufrd_.readbuf.used-bufrd_.curbuf_offset) + (bufwr_.used);
    }

    ulongl seek(ulongl offset, Seek start=sBegin) {
        if (bufwr_.used > 0) {
            if (!flush())
                return 0;
            savepos_ = 0;
        }
        if (bufrd_.readbuf.used > 0)
            bufrd_.readbuf.used = bufrd_.curbuf_offset = 0;
        return device_.seek(error_, offset, start);
    }

private:
    File(const File&);
    File& operator=(const File&);
};


}
#endif