static couchstore_error_t couch_open(couchstore_error_info_t *errinfo,
couch_file_handle* handle,
const char *path,
int oflag)
{
int creationflag = OPEN_EXISTING;
if(oflag & O_CREAT) {
creationflag = OPEN_ALWAYS;
}
HANDLE os_handle = CreateFileA(path, GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_DELETE | FILE_SHARE_WRITE | FILE_SHARE_READ,
NULL, creationflag, 0, NULL);
if(os_handle == INVALID_HANDLE_VALUE) {
DWORD last_error = save_windows_error(errinfo);
if(last_error == ERROR_FILE_NOT_FOUND ||
last_error == ERROR_SUCCESS) {
return (ssize_t) COUCHSTORE_ERROR_NO_SUCH_FILE;
};
return COUCHSTORE_ERROR_OPEN_FILE;
}
/* Tell the caller about the new handle (file descriptor) */
*handle = win_to_handle(os_handle);
return COUCHSTORE_SUCCESS;
}
static off_t couch_goto_eof(couch_file_handle handle)
{
HANDLE file = handle_to_win(handle);
LARGE_INTEGER size;
if(!GetFileSizeEx(file, &size)) {
save_windows_error();
return (off_t) COUCHSTORE_ERROR_READ;
}
return size.QuadPart;
}
static couchstore_error_t couch_sync(couch_file_handle handle)
{
HANDLE file = handle_to_win(handle);
if (!FlushFileBuffers(file)) {
save_windows_error();
return COUCHSTORE_ERROR_WRITE;
}
return COUCHSTORE_SUCCESS;
}
static ssize_t couch_pwrite(couch_file_handle handle, const void *buf, size_t nbyte, off_t offset)
{
#ifdef LOG_IO
fprintf(stderr, "PWRITE %8llx -- %8llx (%6.1f kbytes)\n", offset, offset+nbyte, nbyte/1024.0);
#endif
HANDLE file = handle_to_win(handle);
BOOL rv;
DWORD byteswritten;
OVERLAPPED winoffs;
memset(&winoffs, 0, sizeof(winoffs));
winoffs.Offset = offset & 0xFFFFFFFF;
winoffs.OffsetHigh = offset >> 32;
rv = WriteFile(file, buf, nbyte, &byteswritten, &winoffs);
if(!rv) {
save_windows_error();
return (ssize_t) COUCHSTORE_ERROR_WRITE;
}
return byteswritten;
}
static ssize_t couch_pread(couchstore_error_info_t *errinfo,
couch_file_handle handle,
void *buf,
size_t nbyte,
cs_off_t offset)
{
#ifdef LOG_IO
fprintf(stderr, "PREAD %8llx -- %8llx (%6.1f kbytes)\n", offset, offset+nbyte, nbyte/1024.0);
#endif
HANDLE file = handle_to_win(handle);
BOOL rv;
DWORD bytesread;
OVERLAPPED winoffs;
memset(&winoffs, 0, sizeof(winoffs));
winoffs.Offset = offset & 0xFFFFFFFF;
winoffs.OffsetHigh = (offset >> 32) & 0x7FFFFFFF;
rv = ReadFile(file, buf, nbyte, &bytesread, &winoffs);
if(!rv) {
save_windows_error(errinfo);
return (ssize_t) COUCHSTORE_ERROR_READ;
}
return bytesread;
}