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Diffstat (limited to 'Source/cmFileTimeComparison.cxx')
-rw-r--r-- | Source/cmFileTimeComparison.cxx | 277 |
1 files changed, 277 insertions, 0 deletions
diff --git a/Source/cmFileTimeComparison.cxx b/Source/cmFileTimeComparison.cxx new file mode 100644 index 0000000..5727470 --- /dev/null +++ b/Source/cmFileTimeComparison.cxx @@ -0,0 +1,277 @@ +/*============================================================================ + 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; + } +} |