126 lines
2.5 KiB
C++
126 lines
2.5 KiB
C++
//This file is part of Photon (http://photon.sourceforge.net)
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//Copyright (C) 2004-2005 James Turk
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//
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// Author:
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// James Turk (jpt2433@rit.edu)
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//
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// Version:
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// $Id: FileBuffer.cpp,v 1.6 2005/06/11 05:28:41 cozman Exp $
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#include "util/FileBuffer.hpp"
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#include "exceptions.hpp"
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namespace photon
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{
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namespace util
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{
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FileBuffer::FileBuffer() :
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file_(0)
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{}
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FileBuffer::FileBuffer(const std::string& filename)
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{
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open(filename);
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}
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FileBuffer::~FileBuffer()
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{}
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void FileBuffer::open(const std::string& filename)
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{
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file_ = PHYSFS_openRead(filename.c_str());
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if(file_ == 0)
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{
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throw ResourceException();
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}
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}
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void FileBuffer::close()
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{
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if(file_ == 0)
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{
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throw PreconditionException("No file open in FileBuffer::close");
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}
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PHYSFS_close(file_);
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}
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std::vector<ubyte> FileBuffer::getData(int amount)
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{
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if(file_ == 0)
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{
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throw PreconditionException("No file open in FileBuffer::getData");
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}
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// if amount is 0, read entire buffer
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if(amount == 0)
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{
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amount = getSize();
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}
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std::vector<ubyte> buffer(amount); //create buffer
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// try to read 'amount' bytes into buffer
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PHYSFS_sint64 bytesRead = PHYSFS_read(file_, &buffer[0], 1, amount);
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// if -1 is returned (an error) or fewer bytes were read than asked but
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// eof hasn't been reached, PhysFS encountered an error
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if( bytesRead == -1 || (bytesRead < amount && PHYSFS_eof(file_) == 0) )
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{
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throw APIError(std::string("PhysFS failure in FileBuffer::getData (") +
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PHYSFS_getLastError() + ")");
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}
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buffer.resize(bytesRead); //shrink to size()==bytesRead
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return buffer;
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}
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uint FileBuffer::getPosition() const
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{
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if(file_ == 0)
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{
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throw PreconditionException("No file open in FileBuffer::getPosition");
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}
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PHYSFS_sint64 pos = PHYSFS_tell(file_);
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if(pos == -1)
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{
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throw APIError(
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std::string("PhysFS failure in FileBuffer::getPosition (") +
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PHYSFS_getLastError() + ")");
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}
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return pos;
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}
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uint FileBuffer::getSize() const
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{
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if(file_ == 0)
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{
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throw PreconditionException("No file open in FileBuffer::getSize");
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}
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PHYSFS_sint64 size = PHYSFS_fileLength(file_);
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if(size == -1)
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{
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throw APIError(std::string("PhysFS failure in FileBuffer::getSize (") +
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PHYSFS_getLastError() + ")");
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}
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return size;
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}
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bool FileBuffer::isOpen() const
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{
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return file_ != 0;
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}
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}
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}
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