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kernel32: Use fstat in GetFileSize (#10) 

Improves mwldeppc performance significantly.

Before:
real    0m30.322s
user    0m7.800s
sys     0m22.495s

After:
real	0m16.679s
user	0m4.693s
sys	    0m11.965s

Wine (for comparison):
real    0m24.625s
user    0m0.048s
sys     0m0.034s
This commit is contained in:
Luke Street 2022-07-05 18:13:20 -04:00 committed by GitHub
parent 07af846d1c
commit a8b9452f33
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 11 additions and 11 deletions
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22
kernel32.cpp
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@ -7,6 +7,7 @@
#include <malloc.h>
#include <stdarg.h>
#include <system_error>
#include <sys/stat.h>
namespace kernel32 {
@ -442,19 +443,18 @@ namespace kernel32 {
*/
unsigned int WIN_FUNC GetFileSize(void *hFile, unsigned int *lpFileSizeHigh) {
DEBUG_LOG("GetFileSize\n");
struct stat64 st;
FILE *fp = files::fpFromHandle(hFile);
long pos = ftell(fp);
assert(pos >= 0);
int r = fseek(fp, 0L, SEEK_END);
assert(r == 0);
long sz = ftell(fp);
assert(sz >= 0);
fseek(fp, pos, SEEK_SET);
if (lpFileSizeHigh) {
*lpFileSizeHigh = 0;
fflush(fp);
if (fstat64(fileno(fp), &st) == -1 || !S_ISREG(st.st_mode)) {
wibo::lastError = 2; // ERROR_FILE_NOT_FOUND (?)
return ~0u; // INVALID_FILE_SIZE
}
DEBUG_LOG("-> %d\n", (int)sz);
return (unsigned int)sz;
DEBUG_LOG("-> %ld\n", st.st_size);
if (lpFileSizeHigh != nullptr) {
*lpFileSizeHigh = st.st_size >> 32;
}
return st.st_size;
}
struct FILETIME {