CMake/Source/cmFileTimeComparison.cxx

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/*============================================================================
CMake - Cross Platform Makefile Generator
Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
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Distributed under the OSI-approved BSD License (the "License");
see accompanying file Copyright.txt for details.
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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.
============================================================================*/
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#include "cmFileTimeComparison.h"
// Use a hash table to avoid duplicate file time checks from disk.
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#if defined(CMAKE_BUILD_WITH_CMAKE)
# include <cmsys/hash_map.hxx>
#endif
// Use a platform-specific API to get file times efficiently.
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#if !defined(_WIN32) || defined(__CYGWIN__)
# define cmFileTimeComparison_Type struct stat
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# include <ctype.h>
# include <sys/stat.h>
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#else
# define cmFileTimeComparison_Type FILETIME
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# include <windows.h>
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#endif
//----------------------------------------------------------------------------
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class cmFileTimeComparisonInternal
{
public:
// Internal comparison method.
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inline bool FileTimeCompare(const char* f1, const char* f2, int* result);
bool FileTimesDiffer(const char* f1, const char* f2);
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private:
#if defined(CMAKE_BUILD_WITH_CMAKE)
// Use a hash table to efficiently map from file name to modification time.
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class HashString
{
public:
size_t operator()(const cmStdString& s) const
{
return h(s.c_str());
}
cmsys::hash<const char*> h;
};
typedef cmsys::hash_map<cmStdString,
cmFileTimeComparison_Type, HashString> FileStatsMap;
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FileStatsMap Files;
#endif
// Internal methods to lookup and compare modification times.
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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);
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};
//----------------------------------------------------------------------------
bool cmFileTimeComparisonInternal::Stat(const char* fname,
cmFileTimeComparison_Type* st)
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{
#if defined(CMAKE_BUILD_WITH_CMAKE)
// Use the stored time if available.
cmFileTimeComparisonInternal::FileStatsMap::iterator fit =
this->Files.find(fname);
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if ( fit != this->Files.end() )
{
*st = fit->second;
return true;
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}
#endif
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#if !defined(_WIN32) || defined(__CYGWIN__)
// POSIX version. Use the stat function.
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int res = ::stat(fname, st);
if ( res != 0 )
{
return false;
}
#else
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// Windows version. Get the modification time from extended file
// attributes.
WIN32_FILE_ATTRIBUTE_DATA fdata;
if(!GetFileAttributesEx(fname, GetFileExInfoStandard, &fdata))
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{
return false;
}
// Copy the file time to the output location.
*st = fdata.ftLastWriteTime;
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#endif
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#if defined(CMAKE_BUILD_WITH_CMAKE)
// Store the time for future use.
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this->Files[fname] = *st;
#endif
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return true;
}
//----------------------------------------------------------------------------
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cmFileTimeComparison::cmFileTimeComparison()
{
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this->Internals = new cmFileTimeComparisonInternal;
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}
//----------------------------------------------------------------------------
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cmFileTimeComparison::~cmFileTimeComparison()
{
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delete this->Internals;
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}
//----------------------------------------------------------------------------
bool cmFileTimeComparison::FileTimeCompare(const char* f1,
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const char* f2, int* result)
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{
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return this->Internals->FileTimeCompare(f1, f2, result);
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}
//----------------------------------------------------------------------------
bool cmFileTimeComparison::FileTimesDiffer(const char* f1, const char* f2)
{
return this->Internals->FileTimesDiffer(f1, f2);
}
//----------------------------------------------------------------------------
int cmFileTimeComparisonInternal::Compare(cmFileTimeComparison_Type* s1,
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cmFileTimeComparison_Type* s2)
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{
#if !defined(_WIN32) || defined(__CYGWIN__)
# if cmsys_STAT_HAS_ST_MTIM
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// 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;
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#else
// Compare using system-provided function.
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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)
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{
// Get the modification time for each file.
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cmFileTimeComparison_Type s1;
cmFileTimeComparison_Type s2;
if(this->Stat(f1, &s1) &&
this->Stat(f2, &s2))
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{
// Compare the two modification times.
*result = this->Compare(&s1, &s2);
return true;
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}
else
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{
// No comparison available. Default to the same time.
*result = 0;
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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;
}
}