SpectMorph: lib/smmmapin.hh Source File

SpectMorph
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00001 /*
00002  * Copyright (C) 2010 Stefan Westerfeld
00003  *
00004  * This library is free software; you can redistribute it and/or modify it
00005  * under the terms of the GNU Lesser General Public License as published by the
00006  * Free Software Foundation; either version 3 of the License, or (at your
00007  * option) any later version.
00008  *
00009  * This library is distributed in the hope that it will be useful, but WITHOUT
00010  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00011  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
00012  * for more details.
00013  *
00014  * You should have received a copy of the GNU Lesser General Public License
00015  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
00016  */
00017 
00018 #ifndef SPECTMORPH_MMAP_IN_HH
00019 #define SPECTMORPH_MMAP_IN_HH
00020 
00021 #include <string>
00022 
00023 #include "smgenericin.hh"
00024 
00025 namespace SpectMorph
00026 {
00027 
00028 class MMapIn : public GenericIn
00029 {
00030   unsigned char *mapfile;
00031   unsigned char *mapend;
00032   unsigned char *pos;
00033   int            fd;
00034 
00035   MMapIn (unsigned char *mapfile, unsigned char *mapend, int fd);
00036   ~MMapIn();
00037 public:
00038   static GenericIn* open (const std::string& filename);
00039   static GenericIn* open_mem (unsigned char *mem_start, unsigned char *mem_end);
00040 
00041   int get_byte();     // like fgetc
00042   int read (void *ptr, size_t size);
00043   bool skip (size_t size);
00044   unsigned char *mmap_mem (size_t& remaining);
00045   size_t get_pos();
00046   GenericIn *open_subfile (size_t pos, size_t len);
00047 };
00048 
00049 }
00050 
00051 #endif /* SPECTMORPH_MMAP_IN_HH */