/*+
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).+
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* All rights reserved.+
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*+
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* This program is free software: you can redistribute it and/or modify+
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* it under the terms of the GNU Lesser General Public License as published by+
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* the Free Software Foundation, either version 3 of the License, or+
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* (at your option) any later version.+
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*+
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* This program is distributed in the hope that it will be useful,+
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* but WITHOUT ANY WARRANTY; without even the implied warranty of+
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the+
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* GNU Lesser General Public License for more details.+
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* +
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* You should have received a copy of the GNU Lesser General Public License+
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* along with this program.  If not, see <http://www.gnu.org/licenses/>.+
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*/+
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+
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#include <fcntl.h>+
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#include <sys/types.h>+
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#include <unistd.h>+
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#include <cassert>+
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+
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#include "elfromerror.h"+
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#include "inputfile.h"+
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+
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InputFile & InputFile::operator=(const InputFile & aInputFile) {+
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	// Don't copy fd. Force a new to be got.+
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	iOpened = false;+
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	// Force size to be re-computed+
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	iSizeValid = false;+
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	iOffset = aInputFile.iOffset;+
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	iPathName = aInputFile.iPathName;+
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	return *this;+
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}+
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+
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InputFile::InputFile(const InputFile & aInputFile){+
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	*this = aInputFile;+
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}+
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+
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InputFile::~InputFile(){+
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	Close();+
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}+
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+
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void InputFile::Open(){+
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	if (iOpened) return;+
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	if ((iFd = open(iPathName.c_str(), O_RDONLY|O_BINARY, 0)) < 0)+
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		errx(EX_NOINPUT, "open \"%s\" failed\n", iPathName.c_str());+
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	else+
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		iOpened = true;+
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}+
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+
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void InputFile::Close(){+
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	if (!iOpened) return;+
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	close(iFd);+
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	iOpened = false;+
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	iSizeValid = false;+
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}+
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+
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size_t InputFile::Size(){+
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	if (iSizeValid) return iSize - iOffset;+
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	SetSize();+
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	return iSize - iOffset;+
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}+
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+
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void InputFile::SetSize(){+
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	Open();+
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	if ((iSize = lseek(iFd, (size_t)0, SEEK_END)) == (size_t)-1)+
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		errx(EX_NOINPUT, "failed to get size of \"%s\"", iPathName.c_str());+
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	if (lseek(iFd, (size_t)0, SEEK_SET) != 0)+
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		errx(EX_NOINPUT, "failed to get size of \"%s\"", iPathName.c_str());+
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	Close();+
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	iSizeValid = true;+
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}+
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+
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char * InputFile::GetData(){+
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	size_t nbytes = Size();+
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	return GetData(nbytes);+
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}+
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+
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char * InputFile::GetData(size_t nbytes) {+
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	char * data = new char[nbytes];+
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	GetData(data, nbytes);+
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	return data;+
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}+
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+
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void InputFile::GetData(void * data, size_t nbytes){+
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	char * d = (char *)data;+
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	size_t done = 0;+
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	ssize_t n;+
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	+
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	Open();+
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	+
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	if (iOffset > 0)+
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		if ((size_t)lseek(iFd, iOffset, SEEK_SET) != iOffset) {+
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			Close();+
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			errx(EX_NOINPUT, "failed to read from \"%s\"", iPathName.c_str());+
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		}+
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	+
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	while (nbytes){+
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		n = read(iFd, d+done,nbytes);+
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		// n must be greater than 0+
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		if (n <= 0){+
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			Close();+
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			errx(EX_NOINPUT, "failed to read from \"%s\"", iPathName.c_str());+
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		}+
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		done += n;+
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		nbytes -= n;+
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	}+
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	+
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	Close();+
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}+
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