mirror of https://github.com/stella-emu/stella.git
These classes are used to provide a platform-independent way (I hope) to
store integers and booleans, even on systems with different variable widths. Currently, they are used to implement the storage and retrieval of binary data that make up the state files. I'd appreciate testing on systems with different variable widths and endianness (other than i386). git-svn-id: svn://svn.code.sf.net/p/stella/code/trunk@94 8b62c5a3-ac7e-4cc8-8f21-d9a121418aba
This commit is contained in:
stephena
parent
3e3ca7d10e
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158b91f98c
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//============================================================================
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//
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// SSSS tt lll lll
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// SS SS tt ll ll
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// SS tttttt eeee ll ll aaaa
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// SSSS tt ee ee ll ll aa
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// SS tt eeeeee ll ll aaaaa -- "An Atari 2600 VCS Emulator"
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// SS SS tt ee ll ll aa aa
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// SSSS ttt eeeee llll llll aaaaa
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//
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// Copyright (c) 1995-1998 by Bradford W. Mott
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//
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// See the file "license" for information on usage and redistribution of
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// this file, and for a DISCLAIMER OF ALL WARRANTIES.
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//
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// $Id: Deserializer.cxx,v 1.1 2002-05-13 19:14:17 stephena Exp $
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//============================================================================
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#include <iostream>
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#include <fstream>
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#include <string>
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#include "Deserializer.hxx"
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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Deserializer::Deserializer(void)
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{
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TruePattern = 0xfab1fab2;
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FalsePattern = 0xbad1bad2;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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Deserializer::~Deserializer(void)
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{
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close();
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if(myStream.is_open())
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myStream.close();
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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bool Deserializer::open(string& fileName)
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{
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close();
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myStream.open(fileName.c_str(), ios::in | ios::binary);
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return myStream.is_open();
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void Deserializer::close(void)
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{
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if(myStream.is_open())
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myStream.close();
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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long Deserializer::getLong(void)
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{
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if(myStream.eof())
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throw "Deserializer: end of file";
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long l;
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myStream.read(reinterpret_cast<char *> (&l), sizeof (long));
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if(myStream.bad())
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throw "Deserializer: file read failed";
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return l;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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string Deserializer::getString(void)
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{
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long len = getLong();
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string str;
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str.resize(len);
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myStream.read(&str[0], len);
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if(myStream.bad())
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throw "Deserializer: file read failed";
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return str;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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bool Deserializer::getBool(void)
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{
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bool result = false;
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long b = getLong();
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if(myStream.bad())
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throw "Deserializer: file read failed";
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if(b == TruePattern)
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result = true;
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else if(b == FalsePattern)
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result = false;
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else
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throw "Deserializer: data corruption";
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return result;
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}
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//============================================================================
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//
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// SSSS tt lll lll
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// SS SS tt ll ll
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// SS tttttt eeee ll ll aaaa
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// SSSS tt ee ee ll ll aa
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// SS tt eeeeee ll ll aaaaa -- "An Atari 2600 VCS Emulator"
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// SS SS tt ee ll ll aa aa
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// SSSS ttt eeeee llll llll aaaaa
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//
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// Copyright (c) 1995-1998 by Bradford W. Mott
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//
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// See the file "license" for information on usage and redistribution of
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// this file, and for a DISCLAIMER OF ALL WARRANTIES.
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//
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// $Id: Deserializer.hxx,v 1.1 2002-05-13 19:14:17 stephena Exp $
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//============================================================================
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#ifndef DESERIALIZER_HXX
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#define DESERIALIZER_HXX
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#include <fstream>
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#include <string>
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/**
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This class implements a Deserializer device, whereby data is
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deserialized from an input binary file in a system-independent
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way.
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All longs should be cast to their appropriate data type upon method
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return.
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@author Stephen Anthony
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@version $Id: Deserializer.hxx,v 1.1 2002-05-13 19:14:17 stephena Exp $
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*/
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class Deserializer
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{
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public:
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/**
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Creates a new Deserializer device.
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Open must be called with a valid file before this Deserializer can
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be used.
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*/
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Deserializer(void);
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/**
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Destructor
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*/
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virtual ~Deserializer(void);
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public:
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/**
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Opens the given file for input. Multiple calls to this method
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will close previously opened files.
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@param fileName The filename to get the deserialized data from.
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@return Result of opening the file. True on success, false on failure
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*/
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bool open(string& fileName);
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/**
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Closes the current input stream.
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*/
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void close(void);
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/**
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Reads a long value from the current input stream.
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@result The long value which has been read from the stream.
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*/
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long getLong(void);
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/**
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Reads a string from the current input stream.
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@result The string which has been read from the stream.
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*/
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string getString(void);
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/**
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Reads a boolean value from the current input stream.
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@result The boolean value which has been read from the stream.
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*/
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bool getBool(void);
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private:
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// The stream to get the deserialized data from.
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ifstream myStream;
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// A long pattern that represents a boolean value of true.
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long TruePattern;
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// A long pattern that represents a boolean value of false.
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long FalsePattern;
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};
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#endif
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@ -0,0 +1,81 @@
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//============================================================================
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//
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// SSSS tt lll lll
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// SS SS tt ll ll
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// SS tttttt eeee ll ll aaaa
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// SSSS tt ee ee ll ll aa
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// SS tt eeeeee ll ll aaaaa -- "An Atari 2600 VCS Emulator"
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// SS SS tt ee ll ll aa aa
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// SSSS ttt eeeee llll llll aaaaa
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//
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// Copyright (c) 1995-1998 by Bradford W. Mott
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//
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// See the file "license" for information on usage and redistribution of
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// this file, and for a DISCLAIMER OF ALL WARRANTIES.
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//
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// $Id: Serializer.cxx,v 1.1 2002-05-13 19:14:17 stephena Exp $
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//============================================================================
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#include <iostream>
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#include <fstream>
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#include <string>
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#include "Serializer.hxx"
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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Serializer::Serializer(void)
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{
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TruePattern = 0xfab1fab2;
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FalsePattern = 0xbad1bad2;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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Serializer::~Serializer(void)
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{
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close();
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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bool Serializer::open(string& fileName)
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{
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close();
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myStream.open(fileName.c_str(), ios::out | ios::binary);
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return myStream.is_open();
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void Serializer::close(void)
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{
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if(myStream.is_open())
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myStream.close();
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void Serializer::putLong(long value)
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{
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myStream.write(reinterpret_cast<char *> (&value), sizeof (long));
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if(myStream.bad())
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throw "Serializer: file write failed";
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void Serializer::putString(string& str)
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{
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int len = str.length();
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putLong(len);
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myStream.write(str.data(), len);
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if(myStream.bad())
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throw "Serializer: file write failed";
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void Serializer::putBool(bool b)
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{
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long l = b ? TruePattern: FalsePattern;
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putLong(l);
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if(myStream.bad ())
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throw "Serializer: file write failed";
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}
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@ -0,0 +1,100 @@
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//============================================================================
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//
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// SSSS tt lll lll
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// SS SS tt ll ll
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// SS tttttt eeee ll ll aaaa
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// SSSS tt ee ee ll ll aa
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// SS tt eeeeee ll ll aaaaa -- "An Atari 2600 VCS Emulator"
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// SS SS tt ee ll ll aa aa
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// SSSS ttt eeeee llll llll aaaaa
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//
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// Copyright (c) 1995-1998 by Bradford W. Mott
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//
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// See the file "license" for information on usage and redistribution of
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// this file, and for a DISCLAIMER OF ALL WARRANTIES.
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//
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// $Id: Serializer.hxx,v 1.1 2002-05-13 19:14:17 stephena Exp $
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//============================================================================
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#ifndef SERIALIZER_HXX
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#define SERIALIZER_HXX
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#include <fstream>
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#include <string>
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/**
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This class implements a Serializer device, whereby data is
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serialized and sent to an output binary file in a system-
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independent way.
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All bytes and integers are written as long's. Strings are
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written as characters prepended by the length of the string.
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Boolean values are written using a special pattern.
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@author Stephen Anthony
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@version $Id: Serializer.hxx,v 1.1 2002-05-13 19:14:17 stephena Exp $
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*/
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class Serializer
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{
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public:
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/**
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Creates a new Serializer device.
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Open must be called with a valid file before this Serializer can
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be used.
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*/
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Serializer(void);
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/**
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Destructor
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*/
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virtual ~Serializer(void);
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public:
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/**
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Opens the given file for output. Multiple calls to this method
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will close previously opened files.
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@param fileName The filename to send the serialized data to.
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@return Result of opening the file. True on success, false on failure
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*/
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bool open(string& fileName);
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/**
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Closes the current output stream.
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*/
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void close(void);
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/**
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Writes a long value to the current output stream.
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@param value The long value to write to the output stream.
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*/
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void putLong(long value);
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/**
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Writes a string to the current output stream.
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@param str The string to write to the output stream.
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*/
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void putString(string& str);
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/**
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Writes a boolean value to the current output stream.
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@param b The boolean value to write to the output stream.
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*/
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void putBool(bool b);
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private:
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// The stream to send the serialized data to.
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ofstream myStream;
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// A long pattern that represents a boolean value of true.
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long TruePattern;
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// A long pattern that represents a boolean value of false.
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long FalsePattern;
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};
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#endif
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