AOO410/main/shell/source/win32/shlxthandler/ooofilt/stream_helper.cxx

/**************************************************************
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/



// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_shell.hxx"

#if defined _MSC_VER
#pragma warning(push, 1)
#endif
#include <windows.h>
#if defined _MSC_VER
#pragma warning(pop)
#endif 

#include <stdio.h>
#include <objidl.h>

/*#include <string.h>
#include <filter.h>
#include <filterr.h>
#include <ntquery.h>
#include "assert.h"
#include "propspec.hxx"
#ifdef __MINGW32__
#include <algorithm>
using ::std::min;
#endif
*/

#include "internal/stream_helper.hxx"

extern "C" {
	voidpf ZCALLBACK cb_sopen OF((voidpf opaque, const char * filename, int mode));
	uLong ZCALLBACK cb_sread OF((voidpf opaque, voidpf stream, void* vuf, uLong size));
	uLong ZCALLBACK cb_swrite OF((voidpf opaque, voidpf stream, const void* buf, uLong size));
	long ZCALLBACK cb_stell OF((voidpf opaque, voidpf stream));
	long ZCALLBACK cb_sseek OF((voidpf opaque, voidpf stream, uLong offset, int origin));
	int ZCALLBACK cb_sclose OF((voidpf opaque, voidpf stream));
	int ZCALLBACK cb_serror OF((voidpf opaque, voidpf stream));

	void fill_stream_filefunc (zlib_filefunc_def* pzlib_filefunc_def);
}

//-----------------------------
IStream* PrepareIStream( IStream* pStream, zlib_filefunc_def &zFileFunc )
{
    // These next few lines work around the "Seek pointer" bug found on Vista.
    char cBuf[20];
    unsigned long nCount;
    HRESULT hr;
    ULARGE_INTEGER nNewPosition;
    LARGE_INTEGER nMove;	
    nMove.QuadPart = 0;	
    hr = pStream->Seek( nMove, STREAM_SEEK_SET, &nNewPosition );	
    hr = pStream->Read( cBuf, 20, &nCount );

    fill_stream_filefunc( &zFileFunc );
    zFileFunc.opaque = (void*)pStream;

    return pStream;
}

extern "C" {

	// IStream callback
	voidpf ZCALLBACK cb_sopen (voidpf opaque, const char* /*filename*/, int /*mode*/) {		
		return opaque;
	}

	uLong ZCALLBACK cb_sread (voidpf /*opaque*/, voidpf stream, void* buf, uLong size) {
		unsigned long newsize;
		HRESULT hr;
	
		hr = ((IStream *)stream)->Read (buf, size, &newsize);
		if (hr == S_OK){
			return (unsigned long)newsize;
		}
		else {			
			return (uLong)0;
		}
	}

	long ZCALLBACK cb_sseek (voidpf /*opaque*/, voidpf stream, uLong offset, int origin) {
		// IStream::Seek parameters
		HRESULT hr;
		LARGE_INTEGER Move;
		DWORD dwOrigin;		
		Move.QuadPart = (__int64)offset;	

		switch (origin) {
			case SEEK_CUR:
				dwOrigin = STREAM_SEEK_CUR;
				break;
			case SEEK_END:
				dwOrigin = STREAM_SEEK_END;
				break;
			case SEEK_SET:
				dwOrigin = STREAM_SEEK_SET;
				break;
			default:
				return -1;
		}
	
		hr = ((IStream*)stream)->Seek (Move, dwOrigin, NULL);
		if (hr == S_OK){	
			return 0;
		}
		else {			
			return -1;
		}
	}

	long ZCALLBACK cb_stell (voidpf /*opaque*/, voidpf stream) {
		// IStream::Seek parameters
		HRESULT hr;
		LARGE_INTEGER Move;
		ULARGE_INTEGER NewPosition;
		Move.QuadPart = 0;
		NewPosition.QuadPart = 0;
		
		hr = ((IStream*)stream)->Seek (Move, STREAM_SEEK_CUR, &NewPosition);
		if (hr == S_OK){			
			return (long) NewPosition.QuadPart;
		}
		else {
			return -1;
		}
	}

	int ZCALLBACK cb_sclose (voidpf /*opaque*/, voidpf /*stream*/) {
		return 0;
	}

	int ZCALLBACK cb_serror (voidpf /*opaque*/, voidpf /*stream*/) {
		return 0;  //RJK - for now
	}

	uLong ZCALLBACK cb_swrite (voidpf /*opaque*/, voidpf stream, const void* buf, uLong size) {
		HRESULT hr;
		unsigned long writecount;
		hr = ((IStream*)stream)->Write (buf, size, &writecount);
		if (hr == S_OK)
			return (unsigned int)writecount;
		else
			return (uLong)0;
	}

	void fill_stream_filefunc (zlib_filefunc_def* pzlib_filefunc_def) {
		pzlib_filefunc_def->zopen_file = cb_sopen;
		pzlib_filefunc_def->zread_file = cb_sread;
		pzlib_filefunc_def->zwrite_file = cb_swrite;
		pzlib_filefunc_def->ztell_file = cb_stell;
		pzlib_filefunc_def->zseek_file = cb_sseek;
		pzlib_filefunc_def->zclose_file = cb_sclose;
		pzlib_filefunc_def->zerror_file = cb_serror;		
	}
}