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/*
* Copyright (C) 2008-2012, OctaneSnail <os@v12pwr.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <windows.h>
#include <streams.h>
#include "File.h"
#include "Utils.h"
static int compare (const void *pos, const void *part)
{
if (*((LONGLONG *) pos) < ((CRFSFilePart *) part)->in_file_offset)
return -1;
if (*((LONGLONG *) pos) >= ((CRFSFilePart *) part)->in_file_offset + ((CRFSFilePart *) part)->size)
return 1;
return 0;
}
int CRFSFile::FindStartPart (LONGLONG position)
{
if (position > size)
return -1;
// Check if the previous lookup up still matches.
if (m_prev_part && !compare (&position, m_prev_part))
return (int) (m_prev_part - array);
m_prev_part = (CRFSFilePart *) bsearch (&position, array, parts, sizeof (CRFSFilePart), compare);
if (!m_prev_part)
return -1;
return (int) (m_prev_part - array);
}
HRESULT CRFSFile::SyncRead (LONGLONG llPosition, DWORD lLength, BYTE* pBuffer, LONG *cbActual)
{
OVERLAPPED o;
LARGE_INTEGER offset;
DWORD to_read, read, acc = 0;
LONGLONG offset2;
int pos;
#ifdef _DEBUG
static int last_pos = -1;
#endif
if (!pBuffer)
return E_POINTER;
pos = FindStartPart (llPosition);
if (pos == -1)
{
DbgLog((LOG_TRACE, 2, L"FindStartPart bailed length = %lu, pos = %lld", lLength, llPosition));
return S_FALSE;
}
#ifdef _DEBUG
if (pos != last_pos)
{
DbgLog((LOG_TRACE, 2, L"Now reading volume %d.", pos));
last_pos = pos;
}
#endif
CRFSFilePart *part = array + pos;
offset2 = llPosition - part->in_file_offset;
offset.QuadPart = part->in_rar_offset + offset2;
memset (&o, 0, sizeof (o));
if (!(o.hEvent = CreateEvent (NULL, FALSE, FALSE, NULL)))
{
ErrorMsg (GetLastError (), L"CRFSOutputPin::SyncRead - CreateEvent");
return S_FALSE;
}
while (true)
{
read = 0;
to_read = min (lLength, (DWORD) (part->size - offset2));
o.Offset = offset.LowPart;
o.OffsetHigh = offset.HighPart;
if (!ReadFile (part->file, pBuffer + acc, to_read, NULL, &o))
{
DWORD err = GetLastError ();
if (err != ERROR_IO_PENDING)
{
ErrorMsg (err, L"CRFSOutputPin::SyncRead - ReadFile");
break;
}
}
if (!GetOverlappedResult (part->file, &o, &read, TRUE))
{
ErrorMsg (GetLastError (), L"CRFSOutputPin::SyncRead - GetOverlappedResult");
break;
}
lLength -= read;
acc += read;
if (lLength == 0)
{
CloseHandle (o.hEvent);
if (cbActual)
*cbActual = acc;
return S_OK;
}
pos ++;
if (pos >= parts)
break;
part ++;
offset2 = 0;
offset.QuadPart = part->in_rar_offset;
}
CloseHandle (o.hEvent);
if (cbActual)
*cbActual = acc;
return S_FALSE;
}
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