void FArchiveFileReaderWindows::Seek( INT InPos )
{
check(InPos>=0);
check(InPos<=Size);
if( SetFilePointer( Handle, InPos, NULL, FILE_BEGIN )==INVALID_SET_FILE_POINTER )
{
ArIsError = 1;
Error->Logf( TEXT("SetFilePointer Failed %i/%i: %i %s"), InPos, Size, Pos, appGetSystemErrorMessage() );
}
Pos = InPos;
BufferBase = Pos;
BufferCount = 0;
}
void FArchiveFileReaderWindows::Serialize( void* V, INT Length )
{
while( Length>0 )
{
INT Copy = Min( Length, BufferBase+BufferCount-Pos );
if( Copy<=0 )
{
if( Length >= ARRAY_COUNT(Buffer) )
{
INT Count=0;
// Read data from device via Win32 ReadFile API.
{
SCOPED_FILE_IO_READ_STATS( StatsHandle, Length, Pos );
ReadFile( Handle, V, Length, (DWORD*)&Count, NULL );
}
if( Count!=Length )
{
ArIsError = 1;
Error->Logf( TEXT("ReadFile failed: Count=%i Length=%i Error=%s for file %s"),
Count, Length, appGetSystemErrorMessage(), *Filename );
}
Pos += Length;
BufferBase += Length;
return;
}
InternalPrecache( Pos, MAXINT );
Copy = Min( Length, BufferBase+BufferCount-Pos );
if( Copy<=0 )
{
ArIsError = 1;
Error->Logf( TEXT("ReadFile beyond EOF %i+%i/%i for file %s"),
Pos, Length, Size, *Filename );
}
if( ArIsError )
{
return;
}
}
appMemcpy( V, Buffer+Pos-BufferBase, Copy );
Pos += Copy;
Length -= Copy;
V = (BYTE*)V + Copy;
}
}
UBOOL FArchiveFileReaderWindows::InternalPrecache( INT PrecacheOffset, INT PrecacheSize )
{
// Only precache at current position and avoid work if precaching same offset twice.
if( Pos == PrecacheOffset && (!BufferBase || !BufferCount || BufferBase != Pos) )
{
BufferBase = Pos;
BufferCount = Min( Min( PrecacheSize, (INT)(ARRAY_COUNT(Buffer) - (Pos&(ARRAY_COUNT(Buffer)-1))) ), Size-Pos );
BufferCount = Max(BufferCount,0); // clamp to 0
INT Count=0;
// Read data from device via Win32 ReadFile API.
{
SCOPED_FILE_IO_READ_STATS( StatsHandle, BufferCount, Pos );
ReadFile( Handle, Buffer, BufferCount, (DWORD*)&Count, NULL );
}
if( Count!=BufferCount )
{
ArIsError = 1;
Error->Logf( TEXT("ReadFile failed: Count=%i BufferCount=%i Error=%s"), Count, BufferCount, appGetSystemErrorMessage() );
}
}
return TRUE;
}
static void ErrFail(const char *what)
{
int err = GetLastError();
appWPrintf("...%s failed\nError %d %s\n", what, err, appGetSystemErrorMessage(err));
}
