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Dancer Vesperman
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Starting to hack a unified file-access API
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‎files/Flex.cc‎

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/*
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Copyright (C) 2000 Dancer A.L Vesperman
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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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 General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#if __GNUG__ >= 2
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# pragma implementation
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#endif
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#include "Flex.h"
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#include <cstdio>
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#include <iostream>
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void Flex::IndexFlexFile(void)
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{
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Flex &ret=*this;
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FILE *fp;
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const char *name=ret.filename.c_str();
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fp=fopen(name,"rb");
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if(!fp)
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{
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throw 0;
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return;
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}
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fread(ret.title,sizeof(ret.title),1,fp);
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fread(&ret.magic1,sizeof(uint32),1,fp);
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fread(&ret.count,sizeof(uint32),1,fp);
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fread(&ret.magic2,sizeof(uint32),1,fp);
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if(magic1!=0xffff1a00UL)
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throw 0; // Not a flex file
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for(int i=0;i<9;i++)
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fread(&ret.padding[i],sizeof(uint32),1,fp);
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#if DEBUGFLEX
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cout << "Title: " << ret.title << endl;
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cout << "Count: " << ret.count << endl;
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#endif
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// We should already be there.
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fseek(fp,128,SEEK_SET);
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for(unsigned int i=0;i<ret.count;i++)
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{
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Flex::Reference f;
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fread(&f.offset,sizeof(uint32),1,fp);
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fread(&f.size,sizeof(uint32),1,fp);
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#if DEBUGFLEX
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cout << "Item " << i << ": " << f.size << " bytes @ " << f.offset << endl;
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#endif
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ret.object_list.push_back(f);
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}
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fclose(fp);
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}
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#if 0
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char *Flex::read_object(int objnum,uint32 &length)
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{
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if((unsigned)objnum>=object_list.size())
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{
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cerr << "objnum too large in read_object()" << endl;
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return 0;
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}
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FILE *fp=fopen(filename.c_str(),"rb");
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if(!fp)
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{
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cerr << "File open failed in read_object" << endl;
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return 0;
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}
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fseek(fp,object_list[objnum].offset,SEEK_SET);
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length=object_list[objnum].size;
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char *ret=new char[length];
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fread(ret,length,1,fp);
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fclose(fp);
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return ret;
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}
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#endif

‎files/Flex.h‎

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/*
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Copyright (C) 2000 Dancer A.L Vesperman
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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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 General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef __Flex_h_
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#define __Flex_h_
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#if !AUTOCONFIGURED
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#include "../autoconfig.h"
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#endif
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#include <vector>
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#include <string>
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#include "common_types.h"
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#include "U7file.h"
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class Flex : public virtual U7file
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{
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protected:
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char title[80];
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uint32 magic1;
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uint32 count;
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uint32 magic2;
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uint32 padding[9];
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struct Reference
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{
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uint32 offset;
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uint32 size;
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Reference() : offset(0),size(0) {};
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};
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vector<Reference> object_list;
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public:
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Flex(const char *fname);
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Flex(const string &fname);
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~Flex();
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// char *read_object(int objnum,uint32 &length);
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virtual int number_of_objects(const char *) { return object_list.size(); };
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virtual int retrieve(const char *,int objnum,char *,size_t *len); // To a memory block
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virtual int retrieve(const char *,int objnum,const char *); // To a file
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private:
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Flex(); // No default constructor
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void IndexFlexFile(void);
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};
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#endif

‎files/README‎

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The goal here is to make a unified files API that is inherently
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object-centric rather than file-centric. The same (simple) API
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is used to fetch any given object by any given exult subsystem
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and the subsystem requesting the object does not need to know
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what sort of file-format contains the object. The API takes
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care of all of that ugly need-to-know business.
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For the future, and a game creator, the API can be extended to
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pack files as well. I'm also interested in the idea of
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configurable redirections, where an object in a collection can
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be overriden and replaced by some other file/object and that
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redirection be transparent to the core.

‎files/Table.cc‎

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/*
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Copyright (C) 2000 Dancer A.L Vesperman
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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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 General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#if __GNUG__ >= 2
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# pragma implementation
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#endif
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#include "Table.h"
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#include <cstdio>
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#include <iostream>
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Table AccessTableFile(const char *name)
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{
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Table ret;
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FILE *fp;
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ret.filename=name;
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fp=fopen(name,"rb");
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if(!fp)
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{
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return ret;
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}
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unsigned int i=0;
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while(1)
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{
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Table::Reference f;
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fread(&f.size,sizeof(uint16),1,fp);
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if(f.size==65535)
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break;
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fread(&f.offset,sizeof(uint32),1,fp);
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#if 0
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cout << "Item " << i << ": " << f.size << " @ " << f.offset << endl;
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#endif
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ret.object_list.push_back(f);
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i++;
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}
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fclose(fp);
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return ret;
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}
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char *Table::read_object(int objnum,uint32 &length)
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{
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if((unsigned)objnum>=object_list.size())
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{
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cerr << "objnum too large in read_object()" << endl;
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return 0;
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}
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FILE *fp=fopen(filename.c_str(),"rb");
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if(!fp)
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{
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cerr << "File open failed in read_object" << endl;
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return 0;
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}
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fseek(fp,object_list[objnum].offset,SEEK_SET);
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// length=object_list[objnum].size;
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uint16 sz;
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fread(&sz,sizeof(sz),1,fp);
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length=sz-2;
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char *ret=new char[length];
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fread(ret,length,1,fp);
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fclose(fp);
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return ret;
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}

‎files/Table.h‎

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/*
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Copyright (C) 2000 Dancer A.L Vesperman
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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9+
This program is distributed in the hope that it will be useful,
10+
but WITHOUT ANY WARRANTY; without even the implied warranty of
11+
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
13+
14+
You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
16+
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef __Table_h_
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#define __Table_h_
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#if !AUTOCONFIGURED
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#include "../autoconfig.h"
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#endif
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#include <vector>
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#include <string>
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#include "common.h"
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struct Table
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{
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string filename;
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struct Reference
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{
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uint32 offset;
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uint16 size;
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Reference() : offset(0),size(0) {};
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};
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vector<Reference> object_list;
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char *read_object(int objnum,uint32 &length);
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};
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extern Table AccessTableFile(const char *);
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#endif

‎files/U7file.h‎

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#include <string>
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#include <map>
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class U7file
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{
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protected:
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string filename;
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public:
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U7file() {};
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U7file(const char *name) : filename(name) {};
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virtual int number_of_objects(const char *)=0;
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virtual int retrieve(const char *,int objnum,char *,size_t *len)=0; // To a memory block
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virtual int retrieve(const char *,int objnum,const char *)=0; // To a file
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virtual ~U7file();
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};
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class U7FileManager
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{
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protected:
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map<const string,U7file *> file_list;
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public:
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U7FileManager();
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~U7FileManager();
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U7file *get_file_object(const string &s);
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};
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class U7object
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{
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protected:
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string filename;
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int objnumber;
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public:
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virtual int retrieve(char *,size_t len); // Retrieve to a memory block
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virtual int retrieve(const char *); // Retrieve to a filename
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U7object(const char *file,int objnum);
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virtual ~U7object();
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};

‎files/common_types.h‎

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/*
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Copyright (C) 2000 Dancer A.L Vesperman
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4+
This program is free software; you can redistribute it and/or
5+
modify it under the terms of the GNU General Public License
6+
as published by the Free Software Foundation; either version 2
7+
of the License, or (at your option) any later version.
8+
9+
This program is distributed in the hope that it will be useful,
10+
but WITHOUT ANY WARRANTY; without even the implied warranty of
11+
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12+
GNU General Public License for more details.
13+
14+
You should have received a copy of the GNU General Public License
15+
along with this program; if not, write to the Free Software
16+
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef ____common_h_
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#define ____common_h_
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#if !AUTOCONFIGURED
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#include "../autoconfig.h"
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#endif
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typedef unsigned char uint8;
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typedef unsigned long uint32;
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typedef unsigned short uint16;
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#endif
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