-/* This file is part of
- * ======================================================
- *
- * LyX, The Document Processor
- * Copyright 2001 The LyX Team.
+/**
+ * \file lyxsum.C
+ * This file is part of LyX, the document processor.
+ * Licence details can be found in the file COPYING.
*
- * ======================================================
+ * \author Lars Gullik Bjønnes
+ *
+ * Full author contact details are available in file CREDITS.
*/
-
#include <config.h>
-#include <algorithm>
-#include <boost/crc.hpp>
-
#include "support/lyxlib.h"
+
#include "debug.h"
+#include <boost/crc.hpp>
+
+#include <algorithm>
+
using std::endl;
+using std::string;
+
+
+// OK, this is ugly, but it is the only workaround I found to compile
+// with gcc (any version) on a system which uses a non-GNU toolchain.
+// The problem is that gcc uses a weak symbol for a particular
+// instantiation and that the system linker usually does not
+// understand those weak symbols (seen on HP-UX, tru64, AIX and
+// others). Thus we force an explicit instanciation of this particular
+// template (JMarc)
+template struct boost::detail::crc_table_t<32, 0x04C11DB7, true>;
// Various implementations of lyx::sum(), depending on what methods
// are available. Order is faster to slowest.
// not `compatibility' version with caddr_t.
#define _POSIX_C_SOURCE 199506L
-#include <sys/types.h>
-#include <sys/stat.h>
+#ifdef HAVE_SYS_TYPES_H
+# include <sys/types.h>
+#endif
+#ifdef HAVE_SYS_STAT_H
+# include <sys/stat.h>
+#endif
#include <fcntl.h>
-#include <unistd.h>
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
#include <sys/mman.h>
-unsigned long lyx::sum(string const & file)
+
+namespace lyx {
+
+unsigned long support::sum(string const & file)
{
lyxerr[Debug::FILES] << "lyx::sum() using mmap (lightning fast)"
<< endl;
-
+
int fd = open(file.c_str(), O_RDONLY);
- if(!fd)
+ if (!fd)
return 0;
-
+
struct stat info;
fstat(fd, &info);
-
+
void * mm = mmap(0, info.st_size, PROT_READ,
MAP_PRIVATE, fd, 0);
// Some platforms have the wrong type for MAP_FAILED (compaq cxx).
close(fd);
return 0;
}
-
+
char * beg = static_cast<char*>(mm);
char * end = beg + info.st_size;
-
+
boost::crc_32_type crc;
crc.process_block(beg, end);
unsigned long result = crc.checksum();
-
+
munmap(mm, info.st_size);
close(fd);
-
+
return result;
}
+
+} // namespace lyx
+
#else // No mmap
#include <fstream>
#include <iterator>
+
namespace {
template<typename InputIterator>
return crc.checksum();
}
-} // namespace
+} // namespace anon
+
+
+namespace lyx {
+using std::ifstream;
#if HAVE_DECL_ISTREAMBUF_ITERATOR
-unsigned long lyx::sum(string const & file)
+using std::istreambuf_iterator;
+
+unsigned long support::sum(string const & file)
{
lyxerr[Debug::FILES] << "lyx::sum() using istreambuf_iterator (fast)"
<< endl;
- std::ifstream ifs(file.c_str());
+ ifstream ifs(file.c_str());
if (!ifs) return 0;
-
- std::istreambuf_iterator<char> beg(ifs);
- std::istreambuf_iterator<char> end;
-
+
+ istreambuf_iterator<char> beg(ifs);
+ istreambuf_iterator<char> end;
+
return do_crc(beg,end);
}
#else
-unsigned long lyx::sum(string const & file)
+
+using std::istream_iterator;
+using std::ios;
+
+unsigned long support::sum(string const & file)
{
lyxerr[Debug::FILES]
<< "lyx::sum() using istream_iterator (slow as a snail)"
<< endl;
-
- std::ifstream ifs(file.c_str());
+
+ ifstream ifs(file.c_str());
if (!ifs) return 0;
-
- ifs.unsetf(std::ios::skipws);
- std::istream_iterator<char> beg(ifs);
- std::istream_iterator<char> end;
-
+
+ ifs.unsetf(ios::skipws);
+ istream_iterator<char> beg(ifs);
+ istream_iterator<char> end;
+
return do_crc(beg,end);
}
#endif
+
+} // namespace lyx
+
#endif // mmap