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/*
Copyright (C) 2000 Dancer A.L Vesperman
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "IFF.h"
#ifndef ALPHA_LINUX_CXX
# include <cstdio>
#endif
#include <iostream>
#include "exceptions.h"
#include "utils.h"
using std::string;
using std::vector;
#ifndef UNDER_CE
using std::cout;
using std::cerr;
using std::endl;
using std::FILE;
using std::memcmp;
using std::memset;
using std::size_t;
#endif
IFF::IFF(const string &n) : U7file(n)
{
IndexIFFFile();
}
void IFF::IndexIFFFile(void)
{
FILE *fp;
char ckid[4];
fp=U7open(filename.c_str(),"rb");
std::fread(ckid,4,1,fp);
if(memcmp(ckid,"FORM",4))
throw wrong_file_type_exception(filename,"IFF"); // Not an IFF file we recognise
#ifdef DEBUG
cout << "Okay. It looks like an IFF file chunk" << endl;
#endif
long full_length;
full_length = Read4high(fp);
#ifdef DEBUG
cout << "length looks like: " << full_length << endl;
#endif
fseek(fp,4,SEEK_CUR); // We don't really need to know what the general data type is
/*
-the objects entries
entry = type, size, object, [even]
type = 4 chars representing the type of this object
size = reversed longint (size of the entry excluding the first 8 bytes)
even = 1 byte (set to 0) present only to get an even number of bytes
(the objects found in U7 IFF files have the following format:)
object = name, data
name = 8 chars (filled with 0s)
data = the data of the object
*/
while(ftell(fp) < full_length)
{
Reference r;
char type[5];
memset(type,0,sizeof(type));
std::fread(type,4,1,fp); // 4 bytes of type
if(type[0]<32)
{
// We've missed the target. Try to correct
fseek(fp,-3,SEEK_CUR);
continue;
}
r.size=Read4high(fp); // 4 bytes for len
r.offset=ftell(fp);
if(r.size==0||r.offset==0)
break;
object_list.push_back(r);
fseek(fp,r.offset+r.size,SEEK_SET);
}
fclose(fp);
}
char * IFF::retrieve(uint32 objnum, size_t &len)
{
FILE *fp;
char *buffer;
if (objnum >= object_list.size())
throw exult_exception("objnum too large in IFF::retrieve()");
fp = U7open(filename.c_str(), "rb");
fseek(fp, object_list[objnum].offset, SEEK_SET);
len = object_list[objnum].size;
buffer = new char[len];
std::fread(buffer, len, 1, fp);
fclose(fp);
return buffer;
}
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