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+/*============================================================================
+ CMake - Cross Platform Makefile Generator
+ Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
+
+ Distributed under the OSI-approved BSD License (the "License");
+ see accompanying file Copyright.txt for details.
+
+ This software is distributed WITHOUT ANY WARRANTY; without even the
+ implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ See the License for more information.
+============================================================================*/
+#include "cmFileTimeComparison.h"
+
+// Use a hash table to avoid duplicate file time checks from disk.
+#if defined(CMAKE_BUILD_WITH_CMAKE)
+# include <cmsys/hash_map.hxx>
+#endif
+
+#include <cmsys/Encoding.hxx>
+
+// Use a platform-specific API to get file times efficiently.
+#if !defined(_WIN32) || defined(__CYGWIN__)
+# define cmFileTimeComparison_Type struct stat
+# include <ctype.h>
+# include <sys/stat.h>
+#else
+# define cmFileTimeComparison_Type FILETIME
+# include <windows.h>
+#endif
+
+//----------------------------------------------------------------------------
+class cmFileTimeComparisonInternal
+{
+public:
+ // Internal comparison method.
+ inline bool FileTimeCompare(const char* f1, const char* f2, int* result);
+
+ bool FileTimesDiffer(const char* f1, const char* f2);
+
+private:
+#if defined(CMAKE_BUILD_WITH_CMAKE)
+ // Use a hash table to efficiently map from file name to modification time.
+ class HashString
+ {
+ public:
+ size_t operator()(const std::string& s) const
+ {
+ return h(s.c_str());
+ }
+ cmsys::hash<const char*> h;
+ };
+ typedef cmsys::hash_map<std::string,
+ cmFileTimeComparison_Type, HashString> FileStatsMap;
+ FileStatsMap Files;
+#endif
+
+ // Internal methods to lookup and compare modification times.
+ inline bool Stat(const char* fname, cmFileTimeComparison_Type* st);
+ inline int Compare(cmFileTimeComparison_Type* st1,
+ cmFileTimeComparison_Type* st2);
+ inline bool TimesDiffer(cmFileTimeComparison_Type* st1,
+ cmFileTimeComparison_Type* st2);
+};
+
+//----------------------------------------------------------------------------
+bool cmFileTimeComparisonInternal::Stat(const char* fname,
+ cmFileTimeComparison_Type* st)
+{
+#if defined(CMAKE_BUILD_WITH_CMAKE)
+ // Use the stored time if available.
+ cmFileTimeComparisonInternal::FileStatsMap::iterator fit =
+ this->Files.find(fname);
+ if ( fit != this->Files.end() )
+ {
+ *st = fit->second;
+ return true;
+ }
+#endif
+
+#if !defined(_WIN32) || defined(__CYGWIN__)
+ // POSIX version. Use the stat function.
+ int res = ::stat(fname, st);
+ if ( res != 0 )
+ {
+ return false;
+ }
+#else
+ // Windows version. Get the modification time from extended file
+ // attributes.
+ WIN32_FILE_ATTRIBUTE_DATA fdata;
+ if(!GetFileAttributesExW(cmsys::Encoding::ToWide(fname).c_str(),
+ GetFileExInfoStandard, &fdata))
+ {
+ return false;
+ }
+
+ // Copy the file time to the output location.
+ *st = fdata.ftLastWriteTime;
+#endif
+
+#if defined(CMAKE_BUILD_WITH_CMAKE)
+ // Store the time for future use.
+ this->Files[fname] = *st;
+#endif
+
+ return true;
+}
+
+//----------------------------------------------------------------------------
+cmFileTimeComparison::cmFileTimeComparison()
+{
+ this->Internals = new cmFileTimeComparisonInternal;
+}
+
+//----------------------------------------------------------------------------
+cmFileTimeComparison::~cmFileTimeComparison()
+{
+ delete this->Internals;
+}
+
+//----------------------------------------------------------------------------
+bool cmFileTimeComparison::FileTimeCompare(const char* f1,
+ const char* f2, int* result)
+{
+ return this->Internals->FileTimeCompare(f1, f2, result);
+}
+
+//----------------------------------------------------------------------------
+bool cmFileTimeComparison::FileTimesDiffer(const char* f1, const char* f2)
+{
+ return this->Internals->FileTimesDiffer(f1, f2);
+}
+
+//----------------------------------------------------------------------------
+int cmFileTimeComparisonInternal::Compare(cmFileTimeComparison_Type* s1,
+ cmFileTimeComparison_Type* s2)
+{
+#if !defined(_WIN32) || defined(__CYGWIN__)
+# if cmsys_STAT_HAS_ST_MTIM
+ // Compare using nanosecond resolution.
+ if(s1->st_mtim.tv_sec < s2->st_mtim.tv_sec)
+ {
+ return -1;
+ }
+ else if(s1->st_mtim.tv_sec > s2->st_mtim.tv_sec)
+ {
+ return 1;
+ }
+ else if(s1->st_mtim.tv_nsec < s2->st_mtim.tv_nsec)
+ {
+ return -1;
+ }
+ else if(s1->st_mtim.tv_nsec > s2->st_mtim.tv_nsec)
+ {
+ return 1;
+ }
+# else
+ // Compare using 1 second resolution.
+ if(s1->st_mtime < s2->st_mtime)
+ {
+ return -1;
+ }
+ else if(s1->st_mtime > s2->st_mtime)
+ {
+ return 1;
+ }
+# endif
+ // Files have the same time.
+ return 0;
+#else
+ // Compare using system-provided function.
+ return (int)CompareFileTime(s1, s2);
+#endif
+}
+
+//----------------------------------------------------------------------------
+bool cmFileTimeComparisonInternal::TimesDiffer(cmFileTimeComparison_Type* s1,
+ cmFileTimeComparison_Type* s2)
+{
+#if !defined(_WIN32) || defined(__CYGWIN__)
+# if cmsys_STAT_HAS_ST_MTIM
+ // Times are integers in units of 1ns.
+ long long bil = 1000000000;
+ long long t1 = s1->st_mtim.tv_sec * bil + s1->st_mtim.tv_nsec;
+ long long t2 = s2->st_mtim.tv_sec * bil + s2->st_mtim.tv_nsec;
+ if(t1 < t2)
+ {
+ return (t2 - t1) >= bil;
+ }
+ else if(t2 < t1)
+ {
+ return (t1 - t2) >= bil;
+ }
+ else
+ {
+ return false;
+ }
+# else
+ // Times are integers in units of 1s.
+ if(s1->st_mtime < s2->st_mtime)
+ {
+ return (s2->st_mtime - s1->st_mtime) >= 1;
+ }
+ else if(s1->st_mtime > s2->st_mtime)
+ {
+ return (s1->st_mtime - s2->st_mtime) >= 1;
+ }
+ else
+ {
+ return false;
+ }
+# endif
+#else
+ // Times are integers in units of 100ns.
+ LARGE_INTEGER t1;
+ LARGE_INTEGER t2;
+ t1.LowPart = s1->dwLowDateTime;
+ t1.HighPart = s1->dwHighDateTime;
+ t2.LowPart = s2->dwLowDateTime;
+ t2.HighPart = s2->dwHighDateTime;
+ if(t1.QuadPart < t2.QuadPart)
+ {
+ return (t2.QuadPart - t1.QuadPart) >= static_cast<LONGLONG>(10000000);
+ }
+ else if(t2.QuadPart < t1.QuadPart)
+ {
+ return (t1.QuadPart - t2.QuadPart) >= static_cast<LONGLONG>(10000000);
+ }
+ else
+ {
+ return false;
+ }
+#endif
+}
+
+//----------------------------------------------------------------------------
+bool cmFileTimeComparisonInternal::FileTimeCompare(const char* f1,
+ const char* f2,
+ int* result)
+{
+ // Get the modification time for each file.
+ cmFileTimeComparison_Type s1;
+ cmFileTimeComparison_Type s2;
+ if(this->Stat(f1, &s1) &&
+ this->Stat(f2, &s2))
+ {
+ // Compare the two modification times.
+ *result = this->Compare(&s1, &s2);
+ return true;
+ }
+ else
+ {
+ // No comparison available. Default to the same time.
+ *result = 0;
+ return false;
+ }
+}
+
+//----------------------------------------------------------------------------
+bool cmFileTimeComparisonInternal::FileTimesDiffer(const char* f1,
+ const char* f2)
+{
+ // Get the modification time for each file.
+ cmFileTimeComparison_Type s1;
+ cmFileTimeComparison_Type s2;
+ if(this->Stat(f1, &s1) &&
+ this->Stat(f2, &s2))
+ {
+ // Compare the two modification times.
+ return this->TimesDiffer(&s1, &s2);
+ }
+ else
+ {
+ // No comparison available. Default to different times.
+ return true;
+ }
+}