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/* $Id: FileStream.cpp,v 1.4 2009/06/03 01:10:56 ellson Exp $ $Revision: 1.4 $ */
/* vim:set shiftwidth=4 ts=8: */
/**********************************************************
* This software is part of the graphviz package *
* http://www.graphviz.org/ *
* *
* Copyright (c) 1994-2008 AT&T Corp. *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Corp. *
* *
* Information and Software Systems Research *
* AT&T Research, Florham Park NJ *
**********************************************************/
#include "FileStream.h"
#include "gvplugin_device.h"
#include "gvplugin_gdiplus.h"
IStream *FileStream::Create(char *name, FILE *file)
{
return new FileStream(name, file);
}
/* IUnknown methods */
HRESULT FileStream::QueryInterface(
REFIID riid,
void **ppvObject)
{
if (riid == IID_IUnknown)
{
*ppvObject = (IUnknown*)this;
++_ref;
return S_OK;
}
else if (riid == IID_ISequentialStream)
{
*ppvObject = (ISequentialStream*)this;
++_ref;
return S_OK;
}
else if (riid == IID_IStream)
{
*ppvObject = (IStream*)this;
++_ref;
return S_OK;
}
else
{
*ppvObject = NULL;
return E_NOINTERFACE;
}
}
ULONG FileStream::AddRef()
{
return ++_ref;
}
ULONG FileStream::Release()
{
ULONG ref = --_ref;
if (ref == 0)
delete this;
return ref;
}
/* ISequentialStream methods */
HRESULT FileStream::Read(
void *pv,
ULONG cb,
ULONG *pcbRead)
{
ULONG read = fread(pv, 1, cb, _file);
if (pcbRead)
*pcbRead = read;
return S_OK;
}
HRESULT FileStream::Write(
const void *pv,
ULONG cb,
ULONG *pcbWritten)
{
ULONG written = fwrite(pv, 1, cb, _file);
if (pcbWritten)
*pcbWritten = written;
return S_OK;
}
/* IStream methods */
HRESULT FileStream::Seek(
LARGE_INTEGER dlibMove,
DWORD dwOrigin,
ULARGE_INTEGER *plibNewPosition)
{
long whence;
switch (dwOrigin)
{
case STREAM_SEEK_SET:
default:
whence = SEEK_SET;
break;
case STREAM_SEEK_CUR:
whence = SEEK_CUR;
break;
case STREAM_SEEK_END:
whence = SEEK_END;
break;
}
if (dlibMove.HighPart > 0 || fseek(_file, dlibMove.LowPart, whence) != 0)
return S_FALSE;
if (plibNewPosition)
{
long pos = ftell(_file);
if (pos == -1L)
return S_FALSE;
plibNewPosition->HighPart = 0;
plibNewPosition->LowPart = pos;
}
return S_OK;
}
HRESULT FileStream::SetSize(
ULARGE_INTEGER libNewSize)
{
return E_NOTIMPL;
}
HRESULT FileStream::CopyTo(
IStream *pstm,
ULARGE_INTEGER cb,
ULARGE_INTEGER *pcbRead,
ULARGE_INTEGER *pcbWritten)
{
return E_NOTIMPL;
}
HRESULT FileStream::Commit(
DWORD grfCommitFlags)
{
return E_NOTIMPL;
}
HRESULT FileStream::Revert()
{
return 0;
}
HRESULT FileStream::LockRegion(
ULARGE_INTEGER libOffset,
ULARGE_INTEGER cb,
DWORD dwLockType)
{
return E_NOTIMPL;
}
HRESULT FileStream::UnlockRegion(
ULARGE_INTEGER libOffset,
ULARGE_INTEGER cb,
DWORD dwLockType)
{
return E_NOTIMPL;
}
HRESULT FileStream::Stat(
STATSTG *pstatstg,
DWORD grfStatFlag)
{
/* call UNIX fstat on underlying descriptor */
struct _stat file_stat;
if (_fstat(_fileno(_file), &file_stat) != 0)
return S_FALSE;
/* fill in filename, if needed */
if (grfStatFlag != STATFLAG_NONAME)
{
int wide_count = MultiByteToWideChar(CP_UTF8, 0, _name, -1, NULL, 0);
if (wide_count > 0)
{
pstatstg->pwcsName = (LPOLESTR)CoTaskMemAlloc(wide_count * 2);
MultiByteToWideChar(CP_UTF8, 0, _name, -1, pstatstg->pwcsName, wide_count);
}
else
pstatstg->pwcsName = NULL;
}
/* fill out rest of STATSTG */
pstatstg->type = STGTY_STREAM;
pstatstg->cbSize.QuadPart = file_stat.st_size;
UnixTimeToFileTime(file_stat.st_mtime, pstatstg->mtime);
UnixTimeToFileTime(file_stat.st_ctime, pstatstg->ctime);
UnixTimeToFileTime(file_stat.st_atime, pstatstg->atime);
pstatstg->grfLocksSupported = 0;
pstatstg->grfMode = STGM_READWRITE;
pstatstg->clsid = CLSID_NULL;
pstatstg->grfStateBits = 0;
pstatstg->reserved = 0;
return S_OK;
}
HRESULT FileStream::Clone(
IStream **ppstm)
{
return E_NOTIMPL;
}
FileStream::FileStream(char *name, FILE *file): _ref(1), _name(name), _file(file)
{
}
void FileStream::UnixTimeToFileTime(time_t unixTime, FILETIME &fileTime)
{
/* convert Unix time (seconds since 1/1/1970) to Windows filetime (100 nanoseconds since 1/1/1601) */
LONGLONG ft = (LONGLONG)unixTime * 10000000LL + 116444736000000000LL;
fileTime.dwLowDateTime = (DWORD)ft;
fileTime.dwHighDateTime = ft >> 32;
}
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