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fix grabbag__file_are_same() on win32 by using GetFileInformationByHandle() to compare

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This commit is contained in:
Josh Coalson
2006-11-02 01:39:54 +00:00
parent 6986469917
commit 7afb1553c7
2 changed files with 35 additions and 3 deletions
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4
include/share/grabbag/file.h
View File

@@ -45,8 +45,8 @@ const char *grabbag__file_get_basename(const char *srcpath);
*/
FLAC__bool grabbag__file_change_stats(const char *filename, FLAC__bool read_only);
/* returns true iff stat() succeeds for both files and they have the same device and inode */
/*@@@ this does not work on windows so for that the function just returns !strcmp(f1,f2) */
/* returns true iff stat() succeeds for both files and they have the same device and inode. */
/* on windows, uses GetFileInformationByHandle() to compare */
FLAC__bool grabbag__file_are_same(const char *f1, const char *f2);
/* attempts to make writable before unlinking */

34
src/share/grabbag/file.c
View File

@@ -40,6 +40,11 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h> /* for strrchr() */
#if defined _WIN32 && !defined __CYGWIN__
// for GetFileInformationByHandle() etc
#include <Windows.h>
#include <Winbase.h>
#endif
#include "share/grabbag.h"
@@ -111,7 +116,34 @@ FLAC__bool grabbag__file_change_stats(const char *filename, FLAC__bool read_only
FLAC__bool grabbag__file_are_same(const char *f1, const char *f2)
{
#if defined _MSC_VER || defined __MINGW32__
return f1 && f2 && 0 == strcmp(f1, f2); /*@@@@@@ need better method than strcmp */
/* see
* http://www.hydrogenaudio.org/forums/index.php?showtopic=49439&pid=444300&st=0
* http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/fs/getfileinformationbyhandle.asp
* http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/fs/by_handle_file_information_str.asp
* http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/fs/createfile.asp
* apparently both the files have to be open at the same time for the comparison to work
*/
FLAC__bool same = false;
BY_HANDLE_FILE_INFORMATION info1, info2;
HANDLE h1, h2;
BOOL ok = 1;
h1 = CreateFile(f1, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
h2 = CreateFile(f2, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if(h1 == INVALID_HANDLE_VALUE || h2 == INVALID_HANDLE_VALUE)
ok = 0;
ok &= GetFileInformationByHandle(h1, &info1);
ok &= GetFileInformationByHandle(h2, &info2);
if(ok)
same =
info1.dwVolumeSerialNumber == info2.dwVolumeSerialNumber &&
info1.nFileIndexHigh == info2.nFileIndexHigh &&
info1.nFileIndexLow == info2.nFileIndexLow
;
if(h1 != INVALID_HANDLE_VALUE)
CloseHandle(h1);
if(h2 != INVALID_HANDLE_VALUE)
CloseHandle(h2);
return same;
#else
struct stat s1, s2;
return f1 && f2 && stat(f1, &s1) == 0 && stat(f2, &s2) == 0 && s1.st_ino == s2.st_ino && s1.st_dev == s2.st_dev;