InStream.cpp

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// -*- mode: C++; tab-width: 4 -*-
// vi: ts=4

/*
 * Copyright (c) 2009, Patrick A. Palmer.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 *
 *   - Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Patrick A. Palmer nor the names of its
 *     contributors may be used to endorse or promote products derived from
 *     this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE.
 */
 

#include <cstdio>


#include "DPXStream.h"


InStream::InStream() : fp(0)
{
}


InStream::~InStream()
{
}


bool InStream::Open(const char *f)
{
        if (this->fp)
                this->Close();
        if ((this->fp = ::fopen(f, "rb")) == 0)
                return false;
                
        return true;
}


void InStream::Close()
{
        if (this->fp)
        {
                ::fclose(this->fp);
                this->fp = 0;
        }
}


void InStream::Rewind()
{
        if (this->fp)
                ::rewind(fp);
}


bool InStream::Seek(long offset, Origin origin)
{
        int o = 0;
        switch (origin)
        {
        case kCurrent:
                o = SEEK_CUR;
                break;
        case kEnd:
                o = SEEK_END;
                break;
        case kStart:
                o = SEEK_SET;
                break;
        }
        
        if (this->fp == 0)
                return -1;
        return (::fseek(this->fp, offset, o) == 0);
}



size_t InStream::Read(void *buf, const size_t size)
{
        if (this->fp == 0)
                return 0;
        return ::fread(buf, 1, size, this->fp);
}


size_t InStream::ReadDirect(void *buf, const size_t size)
{
        return this->Read(buf, size);
}


bool InStream::EndOfFile() const 
{
        if (this->fp == 0)
                return true;
        return ::feof(this->fp);
}