/**
* filetimes.c : jni methods in nativefiletimes.dll
*
* For instructions on using javah and the C/C++ compiles see:
* http://mindprod.com/jgloss/jni.html#COMPILING
*
* Copyright: (c) 2004-2017 Roedy Green, Canadian Mind Products
*/
#include <windows.h>
// JNI prototypes prepared by javah
#include "filetimes.h"
/*
* prototypes
*/
HANDLE getDirReadHandle( jstring, JNIEnv *);
HANDLE getDirWriteHandle( jstring, JNIEnv *);
HANDLE getFileReadHandle( jstring, JNIEnv *);
HANDLE getFileWriteHandle( jstring, JNIEnv *);
/*
* Class:     com_mindprod_filetimes_FileTimes
* Method:    nativeSetFileTimes
* Signature: (Ljava/lang/String;JJJ)Z
*/
JNIEXPORT jboolean JNICALL Java_com_mindprod_filetimes_FileTimes_nativeSetFileTimes
   ( JNIEnv * env,
     jclass callerclass,
     jstring filename,
     jlong timecreated,
     jlong timeaccessed,
     jlong timeupdated
   )
   {
   // local vars
   // FILETIMES are just little-endian longs split in two.
   FILETIME fttimecreated;
   FILETIME fttimeaccessed;
   FILETIME fttimeupdated;
   HANDLE handle;
   jboolean result;
   fttimecreated.dwLowDateTime = (DWORD) (timecreated & 0xffffffff);
   fttimecreated.dwHighDateTime = (DWORD) ((timecreated >> 32) & 0xffffffff);
   fttimeaccessed.dwLowDateTime = (DWORD) (timeaccessed & 0xffffffff);
   fttimeaccessed.dwHighDateTime = (DWORD) ((timeaccessed >> 32) & 0xffffffff);
   fttimeupdated.dwLowDateTime = (DWORD) (timeupdated & 0xffffffff);
   fttimeupdated.dwHighDateTime = (DWORD) ((timeupdated >> 32) & 0xffffffff);
   handle = getFileWriteHandle ( filename, env );
   // INVALID_HANDLE_VALUE is -1 cast to HANDLE i.e. pointer type )
   if ( handle == INVALID_HANDLE_VALUE ) return 0;
   // return true on success.
   result = ( jboolean ) SetFileTime( handle, // identifies the file
                                      timecreated  ? &fttimecreated : NULL,
                                      timeaccessed ? &fttimeaccessed : NULL,
                                      timeupdated  ? &fttimeupdated : NULL
                                    );
   // status of close is immaterial. File is now changed.
   CloseHandle ( handle );
   return result;
   } // end function
/*
* Class:     com_mindprod_filetimes_FileTimes
* Method:    nativeGetFileCreated
* Signature: (Ljava/lang/String;)J
*/
JNIEXPORT jlong JNICALL Java_com_mindprod_filetimes_FileTimes_nativeGetFileCreated
   ( JNIEnv * env,
     jclass callerclass,
     jstring filename)
   {
   FILETIME fttimecreated;
   HANDLE handle;
   handle = getFileReadHandle( filename, env );
   // INVALID_HANDLE_VALUE is -1 cast to HANDLE i.e. pointer type )
   if ( handle == INVALID_HANDLE_VALUE ) return 0;
   // return true on success.
   GetFileTime( handle, // identifies the file
                &fttimecreated,
                NULL,
                NULL
              );
   // status of close is immaterial.
   CloseHandle ( handle );
   return(jlong)(fttimecreated.dwHighDateTime) << 32 | fttimecreated.dwLowDateTime;
   }
/*
* Class:     com_mindprod_filetimes_FileTimes
* Method:    nativeGetFileLastAccessed
* Signature: (Ljava/lang/String;)J
*/
JNIEXPORT jlong JNICALL Java_com_mindprod_filetimes_FileTimes_nativeGetFileLastAccessed
   ( JNIEnv * env,
     jclass callerclass,
     jstring filename)
   {
   FILETIME fttimelastAccessed;
   HANDLE handle;
   handle = getFileReadHandle( filename, env );
   // INVALID_HANDLE_VALUE is -1 cast to HANDLE i.e. pointer type )
   if ( handle == INVALID_HANDLE_VALUE ) return 0;
   // return true on success.
   GetFileTime( handle, // identifies the file
                NULL,
                &fttimelastAccessed,
                NULL
              );
   // status of close is immaterial. Dir is now changed.
   CloseHandle ( handle );
   return(jlong)(fttimelastAccessed.dwHighDateTime) << 32 | fttimelastAccessed.dwLowDateTime;
   }
/*
* Class:     com_mindprod_filetimes_FileTimes
* Method:    nativeGetFileLastModified
* Signature: (Ljava/lang/String;)J
*/
JNIEXPORT jlong JNICALL Java_com_mindprod_filetimes_FileTimes_nativeGetFileLastModified
   ( JNIEnv * env,
     jclass callerclass,
     jstring filename)
   {
   FILETIME fttimelastModified;
   HANDLE handle;
   handle = getFileReadHandle( filename, env );
   // INVALID_HANDLE_VALUE is -1 cast to HANDLE i.e. pointer type )
   if ( handle == INVALID_HANDLE_VALUE ) return 0;
   // return true on success.
   GetFileTime( handle, // identifies the file
                NULL,
                NULL,
                &fttimelastModified
              );
   // status of close is immaterial. Dir is now changed.
   CloseHandle ( handle );
   return(jlong)(fttimelastModified.dwHighDateTime) << 32 | fttimelastModified.dwLowDateTime;
   }
/*
* Class:     com_mindprod_filetimes_FileTimes
* Method:    nativeSetDirTimes
* Signature: (Ljava/lang/String;JJJ)Z
*/
JNIEXPORT jboolean JNICALL Java_com_mindprod_filetimes_FileTimes_nativeSetDirTimes
   ( JNIEnv * env,
     jclass callerclass,
     jstring dirname,
     jlong timecreated,
     jlong timeaccessed,
     jlong timeupdated
   )
   {
   // local vars
   // FILETIMES are just little-endian longs split in two.
   FILETIME fttimecreated;
   FILETIME fttimeaccessed;
   FILETIME fttimeupdated;
   HANDLE handle;
   jboolean result;
   fttimecreated.dwLowDateTime = (DWORD) (timecreated & 0xffffffff);
   fttimecreated.dwHighDateTime = (DWORD) ((timecreated >> 32) & 0xffffffff);
   fttimeaccessed.dwLowDateTime = (DWORD) (timeaccessed & 0xffffffff);
   fttimeaccessed.dwHighDateTime = (DWORD) ((timeaccessed >> 32) & 0xffffffff);
   fttimeupdated.dwLowDateTime = (DWORD) (timeupdated & 0xffffffff);
   fttimeupdated.dwHighDateTime = (DWORD) ((timeupdated >> 32) & 0xffffffff);
   handle = getDirWriteHandle( dirname, env );
   // INVALID_HANDLE_VALUE is -1 cast to HANDLE i.e. pointer type )
   if ( handle == INVALID_HANDLE_VALUE ) return 0;
   // return true on success.
   result = ( jboolean ) SetFileTime( handle, // identifies the dir
                                      timecreated  ? &fttimecreated : NULL,
                                      timeaccessed ? &fttimeaccessed : NULL,
                                      timeupdated  ? &fttimeupdated : NULL
                                    );
   // status of close is immaterial. Dir is now changed.
   CloseHandle ( handle );
   return result;
   } // end function
/*
* Class:     com_mindprod_dirtimes_DirTimes
* Method:    nativeGetDirCreated
* Signature: (Ljava/lang/String;)J
*/
JNIEXPORT jlong JNICALL Java_com_mindprod_filetimes_FileTimes_nativeGetDirCreated
   ( JNIEnv * env,
     jclass callerclass,
     jstring dirname)
   {
   FILETIME fttimecreated;
   HANDLE handle;
   handle = getDirReadHandle( dirname, env );
   // INVALID_HANDLE_VALUE is -1 cast to HANDLE i.e. pointer type )
   if ( handle == INVALID_HANDLE_VALUE ) return 0;
   // return true on success.
   GetFileTime( handle, // identifies the dir
                &fttimecreated,
                NULL,
                NULL
              );
   // status of close is immaterial. Dir is now changed.
   CloseHandle ( handle );
   return(jlong)(fttimecreated.dwHighDateTime) << 32 | fttimecreated.dwLowDateTime;
   }
/*
* Class:     com_mindprod_filetimes_FileTimes
* Method:    nativeGetDirLastAccessed
* Signature: (Ljava/lang/String;)J
*/
JNIEXPORT jlong JNICALL Java_com_mindprod_filetimes_FileTimes_nativeGetDirLastAccessed
   ( JNIEnv * env,
     jclass callerclass,
     jstring dirname)
   {
   FILETIME fttimelastAccessed;
   HANDLE handle;
   handle = getDirReadHandle( dirname, env );
   // INVALID_HANDLE_VALUE is -1 cast to HANDLE i.e. pointer type )
   if ( handle == INVALID_HANDLE_VALUE ) return 0;
   // return true on success.
   GetFileTime( handle, // identifies the dir
                NULL,
                &fttimelastAccessed,
                NULL
              );
   // status of close is immaterial. Dir is now changed.
   CloseHandle ( handle );
   return(jlong)(fttimelastAccessed.dwHighDateTime) << 32 | fttimelastAccessed.dwLowDateTime;
   }
/*
* Class:     com_mindprod_filetimes_FileTimes
* Method:    nativeGetDirLastModified
* Signature: (Ljava/lang/String;)J
*/
JNIEXPORT jlong JNICALL Java_com_mindprod_filetimes_FileTimes_nativeGetDirLastModified
   ( JNIEnv * env,
     jclass callerclass,
     jstring dirname)
   {
   FILETIME fttimelastModified;
   HANDLE handle;
   handle = getDirReadHandle( dirname, env );
   // INVALID_HANDLE_VALUE is -1 cast to HANDLE i.e. pointer type )
   if ( handle == INVALID_HANDLE_VALUE ) return 0;
   // return true on success.
   GetFileTime( handle, // identifies the dir
                NULL,
                NULL,
                &fttimelastModified
              );
   // status of close is immaterial. Dir is now changed.
   CloseHandle ( handle );
   return(jlong)(fttimelastModified.dwHighDateTime) << 32 | fttimelastModified.dwLowDateTime;
   }
/**
* get handle to dir we are about to examine.
*/
HANDLE getDirReadHandle( jstring dirname, JNIEnv * env )
   {
   const char * dirname8;
   HANDLE handle;
   // convert java 16 bit dirname string to 8-bit style
   dirname8 = (*env)->GetStringUTFChars( env, dirname, NULL );
   if ( dirname8 == NULL )
      {
      return INVALID_HANDLE_VALUE;
      }
   // get handle to dir
   handle = CreateFile( dirname8,              // identifies the dir
                        GENERIC_READ,           // access read mode
                        FILE_SHARE_READ,        // share mode
                        NULL,                   // address of security descriptor
                        OPEN_EXISTING,          // how to create
                        FILE_FLAG_BACKUP_SEMANTICS,  // Tell Windows we are doing a  backup. Lets us access directory times.
                        // We don't always do this in case they later tighten security.
                        NULL                    // handle of dir with attributes to copy
                      );
   (*env)->ReleaseStringUTFChars( env, dirname, dirname8 );
   return handle;
   }
/**
* get handle to file we are about to examine.
*/
HANDLE getDirWriteHandle( jstring dirname, JNIEnv * env )
   {
   const char * dirname8;
   HANDLE handle;
   // convert java 16 bit filename string to 8-bit style
   dirname8 = (*env)->GetStringUTFChars( env, dirname, NULL );
   if ( dirname8 == NULL )
      {
      return INVALID_HANDLE_VALUE;
      }
   // get handle to file
   handle = CreateFile( dirname8,              // identifies the file
                        GENERIC_WRITE,          // access (read-write) mode
                        FILE_SHARE_READ|FILE_SHARE_WRITE, // share mode
                        NULL,                   // address of security descriptor
                        OPEN_EXISTING,          // how to create
                        FILE_FLAG_BACKUP_SEMANTICS,  // Tell Windows we are restoring from backup. Lets us modifiy directory.
                        // We don't always do this in case they later tighten security.
                        NULL                    // handle of file with attributes to copy
                      );
   (*env)->ReleaseStringUTFChars( env, dirname, dirname8 );
   return handle;
   }
/**
* get handle to file we are about to examine.
*/
HANDLE getFileReadHandle( jstring filename, JNIEnv * env )
   {
   const char * filename8;
   HANDLE handle;
   // convert java 16 bit filename string to 8-bit style
   filename8 = (*env)->GetStringUTFChars( env, filename, NULL );
   if ( filename8 == NULL )
      {
      return INVALID_HANDLE_VALUE;
      }
   // get handle to file
   handle = CreateFile( filename8,              // identifies the file
                        GENERIC_READ,           // access read mode
                        FILE_SHARE_READ,        // share mode
                        NULL,                   // address of security descriptor
                        OPEN_EXISTING,          // how to create
                        0,                      // file attributes
                        NULL                    // handle of file with attributes to copy
                      );
   (*env)->ReleaseStringUTFChars( env, filename, filename8 );
   return handle;
   }
/**
* get handle to file we are about to examine.
*/
HANDLE getFileWriteHandle( jstring filename, JNIEnv * env )
   {
   const char * filename8;
   HANDLE handle;
   // convert java 16 bit filename string to 8-bit style
   filename8 = (*env)->GetStringUTFChars( env, filename, NULL );
   if ( filename8 == NULL )
      {
      return INVALID_HANDLE_VALUE;
      }
   // get handle to file
   handle = CreateFile( filename8,              // identifies the file
                        GENERIC_WRITE,          // access (read-write) mode
                        FILE_SHARE_READ|FILE_SHARE_WRITE, // share mode
                        NULL,                   // address of security descriptor
                        OPEN_EXISTING,          // how to create
                        0,                      // file attributes
                        NULL                    // handle of file with attributes to copy
                      );
   (*env)->ReleaseStringUTFChars( env, filename, filename8 );
   return handle;
   }
// end nativefiletimes.c