libopenraw
orfcontainer.cpp
00001 /*
00002  * libopenraw - orfcontainer.cpp
00003  *
00004  * Copyright (C) 2006, 2010 Hubert Figuiere
00005  *
00006  * This library is free software: you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public License
00008  * as published by the Free Software Foundation, either version 3 of
00009  * the License, or (at your option) any later version.
00010  *
00011  * This library is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with this library.  If not, see
00018  * <http://www.gnu.org/licenses/>.
00019  */
00020 
00021 
00022 #include "trace.h"
00023 #include "orfcontainer.h"
00024 
00025 
00026 using namespace Debug;
00027 
00028 namespace OpenRaw {
00029 
00030 namespace Internals {
00031 
00032 
00033 OrfContainer::OrfContainer(IO::Stream *_file, off_t offset)
00034     : IFDFileContainer(_file, offset)
00035     , subtype_(0)
00036 {
00037 }
00038 
00039 
00040 OrfContainer::~OrfContainer()
00041 {
00042 }
00043 
00044 
00045 IFDFileContainer::EndianType 
00046 OrfContainer::isMagicHeader(const char *p, int len)
00047 {           
00048     if (len < 4){
00049         // we need at least 4 bytes to check
00050         return ENDIAN_NULL;
00051     }
00052     if ((p[0] == 'I') && (p[1] == 'I')) {
00053         if((p[2] == 'R') && ((p[3] == 'O') || (p[3] == 'S'))) {
00054 
00055             Trace(DEBUG1) << "Identified EL ORF file. Subtype = " << p[3] << "\n";
00056             subtype_ = p[3];    
00057             return ENDIAN_LITTLE;
00058         }
00059     }
00060     else if((p[0] == 'M') && (p[1] == 'M')) {
00061         if((p[3] == 'R') && ((p[2] == 'O') || (p[2] == 'S'))) {
00062 
00063             Trace(DEBUG1) << "Identified BE ORF file. Subtype = " << p[2] << "\n";
00064             subtype_ = p[2];
00065             return ENDIAN_BIG;
00066         }
00067     }
00068 
00069     Trace(ERROR) << "Unidentified ORF file\n";
00070 
00071     return ENDIAN_NULL;
00072 }
00073 
00074 }
00075 }
00076