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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "libMems/dmSML/awin32aio.h"
#include "libMems/dmSML/util.h"
#ifdef USE_WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
static VOID CALLBACK DummyCompletionRoutine( DWORD err, DWORD nbytes, LPOVERLAPPED lpo ) {
// we poll for completion, so this is just a dummy to make windows happy.
printf( "completion routine!\n" );
}
int OpenWIN32( aFILE * file, const char *path, int mode ) {
HANDLE result;
DWORD access = mode == A_READ ? GENERIC_READ : GENERIC_WRITE;
DWORD disposition = mode == A_READ ? OPEN_EXISTING : CREATE_ALWAYS;
result = CreateFile(
path,
access,
FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
disposition,
FILE_FLAG_OVERLAPPED,
NULL );
if( result == INVALID_HANDLE_VALUE ) {
access = GetLastError();
printf( "Error opening %s, code %d\n", path, access );
return( 0 );
}
file->w32handle = result;
return( 1 );
}
int CloseWIN32( aFILE * file ) {
return( CloseHandle( file->w32handle ) );
}
int WriteWIN32( aFILE * file, aIORec * rec ) {
static offset_t total_bytes = 0;
DWORD err;
if( file->mode != A_WRITE ) {
return( 0 );
}
rec->w32overlapped = malloc( sizeof( *(rec->w32overlapped) ) );
memset( rec->w32overlapped, 0, sizeof( *(rec->w32overlapped) ) );
if( rec->pos != CURRENT_POS ){
offset_t tmppos = rec->pos;
tmppos >>= 32;
file->filep_high = tmppos;
// clear high bits. Is this really necessary?
tmppos = rec->pos;
tmppos <<= 32;
tmppos >>= 32;
file->filep_low = tmppos;
}
rec->w32overlapped->OffsetHigh = file->filep_high;
rec->w32overlapped->Offset = file->filep_low;
//printf( "issuing write -- first few bytes of buffer are\n" );
//for( i = 0; i < 20; i++ ) {
// printf( "%c", rec->buf[i] );
//}
//printf( "\n" );
total_bytes += rec->size * rec->count;
//printf( "total bytes: %d\n", total_bytes );
if( WriteFileEx(
file->w32handle,
rec->buf,
rec->size*rec->count,
rec->w32overlapped,
DummyCompletionRoutine ) == 0 ) {
err = GetLastError();
printf( "error with WriteFileEx: %d\n", err );
return( 0 );
}
return( 1 );
}
int ReadWIN32( aFILE * file, aIORec * rec ) {
DWORD err;
if( file->mode != A_READ ) {
return( 0 );
}
rec->w32overlapped = malloc( sizeof( *(rec->w32overlapped) ) );
memset( rec->w32overlapped, 0, sizeof( *(rec->w32overlapped) ) );
if( rec->pos != CURRENT_POS ){
offset_t tmppos = rec->pos;
tmppos >>= 32;
file->filep_high = tmppos;
// clear high bits. Is this really necessary?
tmppos = rec->pos;
tmppos <<= 32;
tmppos >>= 32;
file->filep_low = tmppos;
}
rec->w32overlapped->OffsetHigh = file->filep_high;
rec->w32overlapped->Offset = file->filep_low;
if( ReadFileEx(
file->w32handle,
rec->buf,
rec->size*rec->count,
rec->w32overlapped,
DummyCompletionRoutine ) == 0 ) {
err = GetLastError();
switch( err ) {
case ERROR_HANDLE_EOF:
printf( "readfileex says EOF -- we'll pretend it worked\n" );
return( 1 );
default:
printf( "error with ReadFileEx -- Last Error: %d\n", GetLastError() );
printf( "called: ReadFileEx( %d, %d, %d, %d, %d )\n",
file->w32handle,
rec->buf,
rec->size*rec->count,
rec->w32overlapped,
DummyCompletionRoutine );
return( 0 );
}
}
return( 1 );
}
int QueryLastCompleteWIN32( aFILE * file ) {
DWORD result;
// this operation may not have ever been executed yet (the case
// where w32overlapped is NULL) so we must detect this.
if( file->queuetail && file->queuetail->w32overlapped ) {
// this is a simple poll, because we're waiting for 0 msec.
result = WaitForSingleObject( file->w32handle, 0 );
if( result != WAIT_TIMEOUT ) {
return( 1 );
} else {
return( 0 );
}
//return( HasOverlappedIoCompleted( file->queuetail->w32overlapped ) );
} else {
return( 0 );
}
}
#endif /* USE_WIN32 */
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