Octane: bitio/file_bitreader.hpp Source File

00001 //
00002 // file_bitreader  --  file bitreader
00003 //
00004 // Copyright (c) 2003 by Jørgen Ibsen / Jibz
00005 // All Rights Reserved
00006 //
00007 // http://www.ibsensoftware.com/
00008 //
00009 
00014 
00015 #ifndef FILE_BITREADER_HPP_INCLUDED
00016 #define FILE_BITREADER_HPP_INCLUDED
00017 
00018 #include <fstream>
00019 
00020 #include "bitreader.hpp"
00021 
00033 class file_bitreader : public bitreader {
00034 
00035 public:
00039     file_bitreader(const char *name)
00040         : s(name, std::ios::binary)
00041     {
00042         if (s)
00043         {
00044             length = 8 * s.seekg(0, std::ios::end).tellg();
00045             s.seekg(0);
00046         }
00047     }
00051     file_bitreader(const char *name, size_t size_in_bits)
00052         : bitreader(size_in_bits), s(name, std::ios::binary) { ; }
00053 
00054     ~file_bitreader() { finalize(); }
00055 
00058     bool error() const { return !s; }
00059 
00060     bool supports_seek() const { return true; }
00061 
00062 protected:
00063     char read_next_byte() { char c; s.get(c); return c; }
00064     void set_position(size_t pos) { s.seekg((std::streamoff)pos); }
00065 
00066     std::ifstream s;
00067 };
00068 
00069 #endif // FILE_BITREADER_HPP_INCLUDED