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First step toward fixing bug http://bugzilla.lyx.org/show_bug.cgi?id=5252
- Move lyx::sum() to FileName.cpp - Get rid of the third slow implementation of sum() as istreambuf_iterator is supported since at least gcc 3.2. git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@26588 a592a061-630c-0410-9148-cb99ea01b6c8
This commit is contained in:
Abdelrazak Younes
parent
ac1598df31
commit
4122944455
@ -341,7 +341,6 @@ src_support_files = Split('''
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kill.cpp
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lassert.cpp
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lstrings.cpp
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lyxsum.cpp
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lyxtime.cpp
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os.cpp
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qstring_helpers.cpp
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@ -16,6 +16,7 @@
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#include "support/convert.h"
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#include "support/debug.h"
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#include "support/filetools.h"
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#include "support/lassert.h"
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#include "support/lstrings.h"
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#include "support/qstring_helpers.h"
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#include "support/os.h"
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@ -30,13 +31,15 @@
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#include <QTemporaryFile>
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#include <QTime>
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#include "support/lassert.h"
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#include <boost/crc.hpp>
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#include <boost/scoped_array.hpp>
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#include <algorithm>
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#include <iterator>
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#include <fstream>
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#include <iomanip>
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#include <map>
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#include <sstream>
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#include <fstream>
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#include <algorithm>
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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@ -75,11 +78,85 @@ extern "C" int mkstemp(char *);
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# endif
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#endif
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// Various implementations of sum(), depending on what methods
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// are available. Order is faster to slowest.
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#if defined(HAVE_MMAP) && defined(HAVE_MUNMAP)
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#define SUM_WITH_MMAP
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_STAT_H
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# include <sys/stat.h>
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#endif
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#include <fcntl.h>
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#include <sys/mman.h>
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#endif // SUM_WITH_MMAP
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using namespace std;
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// OK, this is ugly, but it is the only workaround I found to compile
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// with gcc (any version) on a system which uses a non-GNU toolchain.
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// The problem is that gcc uses a weak symbol for a particular
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// instantiation and that the system linker usually does not
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// understand those weak symbols (seen on HP-UX, tru64, AIX and
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// others). Thus we force an explicit instanciation of this particular
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// template (JMarc)
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template struct boost::detail::crc_table_t<32, 0x04C11DB7, true>;
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namespace lyx {
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namespace support {
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static unsigned long sum(char const * file)
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{
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#ifdef SUM_WITH_MMAP
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//LYXERR(Debug::FILES, "lyx::sum() using mmap (lightning fast)");
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int fd = open(file, O_RDONLY);
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if (!fd)
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return 0;
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struct stat info;
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fstat(fd, &info);
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void * mm = mmap(0, info.st_size, PROT_READ,
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MAP_PRIVATE, fd, 0);
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// Some platforms have the wrong type for MAP_FAILED (compaq cxx).
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if (mm == reinterpret_cast<void*>(MAP_FAILED)) {
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close(fd);
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return 0;
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}
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char * beg = static_cast<char*>(mm);
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char * end = beg + info.st_size;
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boost::crc_32_type crc;
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crc.process_block(beg, end);
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unsigned long result = crc.checksum();
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munmap(mm, info.st_size);
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close(fd);
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return result;
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#else // no SUM_WITH_MMAP
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//LYXERR(Debug::FILES, "lyx::sum() using istreambuf_iterator (fast)");
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ifstream ifs(file, ios_base::in | ios_base::binary);
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if (!ifs)
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return 0;
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istreambuf_iterator<char> beg(ifs);
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istreambuf_iterator<char> end;
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boost::crc_32_type crc;
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crc = for_each(beg, end, crc);
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return crc.checksum();
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#endif // SUM_WITH_MMAP
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}
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/////////////////////////////////////////////////////////////////////
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//
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@ -431,8 +508,6 @@ bool FileName::chdir() const
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}
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extern unsigned long sum(char const * file);
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unsigned long FileName::checksum() const
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{
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if (!exists()) {
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@ -72,7 +72,6 @@ liblyxsupport_la_SOURCES = \
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lyxlib.h \
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lyxtime.cpp \
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lyxtime.h \
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lyxsum.cpp \
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Messages.cpp \
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Messages.h \
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os.cpp \
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@ -1,133 +0,0 @@
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/**
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* \file lyxsum.cpp
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author Lars Gullik Bjønnes
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*
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* Full author contact details are available in file CREDITS.
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*/
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#include <config.h>
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#include "support/debug.h"
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#include <boost/crc.hpp>
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#include <algorithm>
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#include <iomanip>
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using namespace std;
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// OK, this is ugly, but it is the only workaround I found to compile
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// with gcc (any version) on a system which uses a non-GNU toolchain.
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// The problem is that gcc uses a weak symbol for a particular
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// instantiation and that the system linker usually does not
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// understand those weak symbols (seen on HP-UX, tru64, AIX and
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// others). Thus we force an explicit instanciation of this particular
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// template (JMarc)
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template struct boost::detail::crc_table_t<32, 0x04C11DB7, true>;
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// Various implementations of lyx::sum(), depending on what methods
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// are available. Order is faster to slowest.
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#if defined(HAVE_MMAP) && defined(HAVE_MUNMAP)
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_STAT_H
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# include <sys/stat.h>
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#endif
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#include <fcntl.h>
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#include <sys/mman.h>
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namespace lyx {
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namespace support {
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unsigned long sum(char const * file)
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{
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//LYXERR(Debug::FILES, "lyx::sum() using mmap (lightning fast)");
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int fd = open(file, O_RDONLY);
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if (!fd)
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return 0;
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struct stat info;
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fstat(fd, &info);
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void * mm = mmap(0, info.st_size, PROT_READ,
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MAP_PRIVATE, fd, 0);
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// Some platforms have the wrong type for MAP_FAILED (compaq cxx).
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if (mm == reinterpret_cast<void*>(MAP_FAILED)) {
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close(fd);
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return 0;
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}
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char * beg = static_cast<char*>(mm);
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char * end = beg + info.st_size;
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boost::crc_32_type crc;
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crc.process_block(beg, end);
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unsigned long result = crc.checksum();
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munmap(mm, info.st_size);
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close(fd);
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return result;
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}
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} // namespace support
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} // namespace lyx
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#else // No mmap
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#include <fstream>
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#include <iterator>
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namespace {
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template<typename InputIterator>
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inline
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unsigned long do_crc(InputIterator first, InputIterator last)
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{
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boost::crc_32_type crc;
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crc = for_each(first, last, crc);
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return crc.checksum();
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}
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} // namespace anon
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namespace lyx {
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namespace support {
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unsigned long sum(char const * file)
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{
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ifstream ifs(file, ios_base::in | ios_base::binary);
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if (!ifs)
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return 0;
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#if HAVE_DECL_ISTREAMBUF_ITERATOR
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//LYXERR(Debug::FILES, "lyx::sum() using istreambuf_iterator (fast)");
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istreambuf_iterator<char> beg(ifs);
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istreambuf_iterator<char> end;
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#else
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//LYXERR(Debug::FILES, "lyx::sum() using istream_iterator (slow as a snail)");
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ifs.unsetf(ios::skipws);
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istream_iterator<char> beg(ifs);
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istream_iterator<char> end;
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#endif
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return do_crc(beg,end);
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}
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} // namespace support
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} // namespace lyx
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#endif // mmap
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