- if(PHYSFS_eof(file))
- return traits_type::eof();
-
- size_t bytesread = (size_t) PHYSFS_read(file, buf, 1, sizeof(buf));
- if(bytesread == 0)
- return traits_type::eof();
- setg(buf, buf, buf + bytesread);
-
- return buf[0];
+ 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);