Split physfs/physfs_stream.?pp into multiple files

[supertux.git] / src / physfs / ifile_streambuf.cpp

diff --git a/src/physfs/ifile_streambuf.cpp b/src/physfs/ifile_streambuf.cpp
new file mode 100644 (file)
index 0000000..3d488ea
--- /dev/null
+++ b/src/physfs/ifile_streambuf.cpp
@@ -0,0 +1,101 @@
+//  SuperTux
+//  Copyright (C) 2006 Matthias Braun <matze@braunis.de>
+//
+//  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 3 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, see <http://www.gnu.org/licenses/>.
+
+#include "physfs/ifile_streambuf.hpp"
+
+#include <stdexcept>
+#include <sstream>
+
+IFileStreambuf::IFileStreambuf(const std::string& filename) :
+  file()
+{
+  // check this as PHYSFS seems to be buggy and still returns a
+  // valid pointer in this case
+  if(filename == "") {
+    throw std::runtime_error("Couldn't open file: empty filename");
+  }
+  file = PHYSFS_openRead(filename.c_str());
+  if(file == 0) {
+    std::stringstream msg;
+    msg << "Couldn't open file '" << filename << "': "
+        << PHYSFS_getLastError();
+    throw std::runtime_error(msg.str());
+  }
+}
+
+IFileStreambuf::~IFileStreambuf()
+{
+  PHYSFS_close(file);
+}
+
+int
+IFileStreambuf::underflow()
+{
+  if(PHYSFS_eof(file)) {
+    return traits_type::eof();
+  }
+
+  PHYSFS_sint64 bytesread = PHYSFS_read(file, buf, 1, sizeof(buf));
+  if(bytesread <= 0) {
+    return traits_type::eof();
+  }
+  setg(buf, buf, buf + bytesread);
+
+  return buf[0];
+}
+
+IFileStreambuf::pos_type
+IFileStreambuf::seekpos(pos_type pos, std::ios_base::openmode)
+{
+  if(PHYSFS_seek(file, static_cast<PHYSFS_uint64> (pos)) == 0) {
+    return pos_type(off_type(-1));
+  }
+
+  // the seek invalidated the buffer
+  setg(buf, buf, buf);
+  return pos;
+}
+
+IFileStreambuf::pos_type
+IFileStreambuf::seekoff(off_type off, std::ios_base::seekdir dir,
+                        std::ios_base::openmode mode)
+{
+  off_type pos = off;
+  PHYSFS_sint64 ptell = PHYSFS_tell(file);
+
+  switch(dir) {
+    case std::ios_base::beg:
+      break;
+    case std::ios_base::cur:
+      if(off == 0)
+        return static_cast<pos_type> (ptell) - static_cast<pos_type> (egptr() - gptr());
+      pos += static_cast<off_type> (ptell) - static_cast<off_type> (egptr() - gptr());
+      break;
+    case std::ios_base::end:
+      pos += static_cast<off_type> (PHYSFS_fileLength(file));
+      break;
+    default:
+#ifdef DEBUG
+      assert(false);
+#else
+      return pos_type(off_type(-1));
+#endif
+  }
+
+  return seekpos(static_cast<pos_type> (pos), mode);
+}
+
+/* EOF */