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//--------------------------------------------------------------------
//
// Visual Binary Diff
// Copyright 1997-2005 by Christopher J. Madsen
//
// Support functions for Win32 file I/O
//
// 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 <https://www.gnu.org/licenses/>.
//--------------------------------------------------------------------
#ifndef INCLUDED_FILEIO_HPP
#define INCLUDED_FILEIO_HPP
typedef HANDLE File;
typedef __int64 FPos;
typedef int Size;
const DWORD
SeekEnd = FILE_END,
SeekPos = FILE_BEGIN;
const File InvalidFile = INVALID_HANDLE_VALUE;
#ifndef INVALID_SET_FILE_POINTER
#define INVALID_SET_FILE_POINTER ((DWORD)0xFFFFFFFF)
#endif
//--------------------------------------------------------------------
LPCTSTR ErrorMsg()
{
static TCHAR buf[512];
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | 65, NULL, GetLastError(), 0,
buf, sizeof(buf), NULL);
return buf;
} // end ErrorMsg
//--------------------------------------------------------------------
inline File OpenFile(const char* path, bool writable=false)
{
return CreateFile(path, (writable ? GENERIC_READ|GENERIC_WRITE : GENERIC_READ),
FILE_SHARE_READ|FILE_SHARE_WRITE,
NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
} // end OpenFile
//--------------------------------------------------------------------
inline void CloseFile(File file)
{
CloseHandle(file);
} // end CloseFile
//--------------------------------------------------------------------
inline bool WriteFile(File file, const void* buffer, Size count)
{
DWORD bytesWritten;
return (WriteFile(file, buffer, count, &bytesWritten, NULL) != 0
&& bytesWritten == count);
} // end WriteFile
//--------------------------------------------------------------------
Size ReadFile(File file, void* buffer, Size count)
{
DWORD bytesRead;
if (!ReadFile(file, buffer, count, &bytesRead, NULL)) return -1;
return bytesRead;
} // end ReadFile
//--------------------------------------------------------------------
FPos SeekFile(File file, FPos position, DWORD whence=SeekPos)
{
LARGE_INTEGER li;
li.QuadPart = position;
li.LowPart = SetFilePointer(file, li.LowPart, &li.HighPart, whence);
if ((li.LowPart == INVALID_SET_FILE_POINTER) && (GetLastError() != NO_ERROR))
li.QuadPart = -1;
return li.QuadPart;
} // end SeekFile
//--------------------------------------------------------------------
inline FPos ConvString(char* buffer)
{
return _strtoui64(buffer, NULL, 16);
} // end ConvString
#endif // INCLUDED_FILEIO_HPP
// Local Variables:
// c-file-style: "cjm"
// End:
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