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1 line
19 KiB
C
Executable File
1 line
19 KiB
C
Executable File
/*
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File: FileCopy.c
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Contains: A robust, general purpose file copy routine.
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Version: MoreFiles
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Copyright: © 1992-2001 by Apple Computer, Inc., all rights reserved.
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You may incorporate this sample code into your applications without
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restriction, though the sample code has been provided "AS IS" and the
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responsibility for its operation is 100% yours. However, what you are
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not permitted to do is to redistribute the source as "DSC Sample Code"
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after having made changes. If you're going to re-distribute the source,
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we require that you make it clear in the source that the code was
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descended from Apple Sample Code, but that you've made changes.
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File Ownership:
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DRI: Apple Macintosh Developer Technical Support
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Other Contact: Apple Macintosh Developer Technical Support
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<http://developer.apple.com/bugreporter/>
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Technology: DTS Sample Code
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Writers:
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(JL) Jim Luther
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Change History (most recent first):
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<2> 2/7/01 JL Added standard header. Updated names of includes. Updated
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various routines to use new calling convention of the
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MoreFilesExtras accessor functions.
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<1> 12/06/99 JL MoreFiles 1.5.
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*/
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#include <MacTypes.h>
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#include <MacErrors.h>
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#include <MacMemory.h>
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#include <Files.h>
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#include <Math64.h>
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#define __COMPILINGMOREFILES
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#include "MoreFiles.h"
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#include "MoreFilesExtras.h"
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#include "MoreDesktopMgr.h"
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#include "FileCopy.h"
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/*****************************************************************************/
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/* local constants */
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/* The deny-mode privileges to use when opening the source and destination files. */
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enum
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{
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srcCopyMode = dmRdDenyWr,
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dstCopyMode = dmWrDenyRdWr
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};
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/* The largest (16K) and smallest (.5K) copy buffer to use if the caller doesn't supply
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** their own copy buffer. */
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enum
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{
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bigCopyBuffSize = 0x00004000,
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minCopyBuffSize = 0x00000200
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};
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/*****************************************************************************/
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/* static prototypes */
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static OSErr GetDestinationDirInfo(short vRefNum,
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long dirID,
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ConstStr255Param name,
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long *theDirID,
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Boolean *isDirectory,
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Boolean *isDropBox);
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/* GetDestinationDirInfo tells us if the destination is a directory, it's
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directory ID, and if it's an AppleShare drop box (write privileges only --
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no read or search privileges).
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vRefNum input: Volume specification.
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dirID input: Directory ID.
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name input: Pointer to object name, or nil when dirID
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specifies a directory that's the object.
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theDirID output: If the object is a file, then its parent directory
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ID. If the object is a directory, then its ID.
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isDirectory output: True if object is a directory; false if
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object is a file.
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isDropBox output: True if directory is an AppleShare drop box.
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*/
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static OSErr CheckForForks(short vRefNum,
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long dirID,
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ConstStr255Param name,
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Boolean *hasDataFork,
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Boolean *hasResourceFork);
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/* CheckForForks tells us if there is a data or resource fork to copy.
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vRefNum input: Volume specification of the file's current
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location.
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dirID input: Directory ID of the file's current location.
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name input: The name of the file.
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*/
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static OSErr PreflightFileCopySpace(short srcVRefNum,
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long srcDirID,
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ConstStr255Param srcName,
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ConstStr255Param dstVolName,
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short dstVRefNum,
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Boolean *spaceOK);
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/* PreflightFileCopySpace determines if there's enough space on a
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volume to copy the specified file to that volume.
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Note: The results of this routine are not perfect. For example if the
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volume's catalog or extents overflow file grows when the new file is
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created, more allocation blocks may be needed beyond those needed for
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the file's data and resource forks.
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srcVRefNum input: Volume specification of the file's current
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location.
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srcDirID input: Directory ID of the file's current location.
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srcName input: The name of the file.
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dstVolName input: A pointer to the name of the volume where
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the file will be copied or NULL.
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dstVRefNum input: Volume specification indicating the volume
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where the file will be copied.
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spaceOK output: true if there's enough space on the volume for
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the file's data and resource forks.
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*/
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/*****************************************************************************/
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static OSErr GetDestinationDirInfo(short vRefNum,
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long dirID,
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ConstStr255Param name,
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long *theDirID,
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Boolean *isDirectory,
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Boolean *isDropBox)
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{
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CInfoPBRec pb;
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OSErr error;
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pb.dirInfo.ioACUser = 0; /* ioACUser used to be filler2, clear it before calling GetCatInfo */
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error = GetCatInfoNoName(vRefNum, dirID, name, &pb);
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*theDirID = pb.dirInfo.ioDrDirID;
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*isDirectory = (pb.dirInfo.ioFlAttrib & kioFlAttribDirMask) != 0;
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/* see if access priviledges are make changes, not see folder, and not see files (drop box) */
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*isDropBox = userHasDropBoxAccess(pb.dirInfo.ioACUser);
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return ( error );
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}
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/*****************************************************************************/
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static OSErr CheckForForks(short vRefNum,
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long dirID,
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ConstStr255Param name,
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Boolean *hasDataFork,
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Boolean *hasResourceFork)
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{
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HParamBlockRec pb;
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OSErr error;
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pb.fileParam.ioNamePtr = (StringPtr)name;
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pb.fileParam.ioVRefNum = vRefNum;
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pb.fileParam.ioFVersNum = 0;
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pb.fileParam.ioDirID = dirID;
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pb.fileParam.ioFDirIndex = 0;
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error = PBHGetFInfoSync(&pb);
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*hasDataFork = (pb.fileParam.ioFlLgLen != 0);
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*hasResourceFork = (pb.fileParam.ioFlRLgLen != 0);
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return ( error );
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}
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/*****************************************************************************/
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static OSErr PreflightFileCopySpace(short srcVRefNum,
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long srcDirID,
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ConstStr255Param srcName,
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ConstStr255Param dstVolName,
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short dstVRefNum,
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Boolean *spaceOK)
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{
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UniversalFMPB pb;
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OSErr error;
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unsigned long dstFreeBlocks;
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unsigned long dstBlksPerAllocBlk;
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unsigned long srcDataBlks;
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unsigned long srcResourceBlks;
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error = XGetVolumeInfoNoName(dstVolName, dstVRefNum, &pb.xPB);
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if ( error == noErr )
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{
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/* get allocation block size (always multiple of 512) and divide by 512
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to get number of 512-byte blocks per allocation block */
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dstBlksPerAllocBlk = ((unsigned long)pb.xPB.ioVAlBlkSiz >> 9);
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/* Convert freeBytes to free disk blocks (512-byte blocks) */
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dstFreeBlocks = U32SetU(U64ShiftRight(pb.xPB.ioVFreeBytes, 9));
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/* Now, get the size of the file's data resource forks */
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pb.hPB.fileParam.ioNamePtr = (StringPtr)srcName;
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pb.hPB.fileParam.ioVRefNum = srcVRefNum;
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pb.hPB.fileParam.ioFVersNum = 0;
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pb.hPB.fileParam.ioDirID = srcDirID;
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pb.hPB.fileParam.ioFDirIndex = 0;
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error = PBHGetFInfoSync(&pb.hPB);
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if ( error == noErr )
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{
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/* Since space on Mac OS disks is always allocated in allocation blocks, */
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/* this code takes into account rounding up to the end of an allocation block. */
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/* get number of 512-byte blocks needed for data fork */
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if ( ((unsigned long)pb.hPB.fileParam.ioFlLgLen & 0x000001ff) != 0 )
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{
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srcDataBlks = ((unsigned long)pb.hPB.fileParam.ioFlLgLen >> 9) + 1;
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}
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else
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{
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srcDataBlks = (unsigned long)pb.hPB.fileParam.ioFlLgLen >> 9;
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}
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/* now, calculate number of new allocation blocks needed */
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if ( srcDataBlks % dstBlksPerAllocBlk )
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{
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srcDataBlks = (srcDataBlks / dstBlksPerAllocBlk) + 1;
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}
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else
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{
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srcDataBlks /= dstBlksPerAllocBlk;
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}
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/* get number of 512-byte blocks needed for resource fork */
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if ( ((unsigned long)pb.hPB.fileParam.ioFlRLgLen & 0x000001ff) != 0 )
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{
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srcResourceBlks = ((unsigned long)pb.hPB.fileParam.ioFlRLgLen >> 9) + 1;
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}
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else
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{
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srcResourceBlks = (unsigned long)pb.hPB.fileParam.ioFlRLgLen >> 9;
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}
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/* now, calculate number of new allocation blocks needed */
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if ( srcResourceBlks % dstBlksPerAllocBlk )
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{
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srcResourceBlks = (srcResourceBlks / dstBlksPerAllocBlk) + 1;
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}
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else
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{
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srcResourceBlks /= dstBlksPerAllocBlk;
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}
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/* Is there enough room on the destination volume for the source file? */
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*spaceOK = ( ((srcDataBlks + srcResourceBlks) * dstBlksPerAllocBlk) <= dstFreeBlocks );
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}
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}
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return ( error );
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}
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/*****************************************************************************/
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pascal OSErr FileCopy(short srcVRefNum,
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long srcDirID,
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ConstStr255Param srcName,
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short dstVRefNum,
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long dstDirID,
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ConstStr255Param dstPathname,
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ConstStr255Param copyName,
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void *copyBufferPtr,
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long copyBufferSize,
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Boolean preflight)
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{
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OSErr err;
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short srcRefNum = 0, /* 0 when source data and resource fork are closed */
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dstDataRefNum = 0, /* 0 when destination data fork is closed */
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dstRsrcRefNum = 0; /* 0 when destination resource fork is closed */
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Str63 dstName; /* The filename of the destination. It might be the
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** source filename, it might be a new name... */
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GetVolParmsInfoBuffer infoBuffer; /* Where PBGetVolParms dumps its info */
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long srcServerAdr; /* AppleTalk server address of source (if any) */
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Boolean dstCreated = false, /* true when destination file has been created */
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ourCopyBuffer = false, /* true if we had to allocate the copy buffer */
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isDirectory, /* true if destination is really a directory */
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isDropBox; /* true if destination is an AppleShare drop box */
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long tempLong;
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short tempInt;
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Boolean spaceOK; /* true if there's enough room to copy the file to the destination volume */
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Boolean hasDataFork;
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Boolean hasResourceFork;
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/* Preflight for size */
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if ( preflight )
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{
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err = PreflightFileCopySpace(srcVRefNum, srcDirID, srcName,
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dstPathname, dstVRefNum, &spaceOK);
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if ( err != noErr )
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{
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return ( err );
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}
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if ( !spaceOK )
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{
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return ( dskFulErr );
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}
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}
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/* get the destination's real dirID and make sure it really is a directory */
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err = GetDestinationDirInfo(dstVRefNum, dstDirID, dstPathname,
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&dstDirID, &isDirectory, &isDropBox);
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if ( err != noErr )
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{
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goto ErrorExit;
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}
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if ( !isDirectory )
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{
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return ( dirNFErr );
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}
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/* get the destination's real vRefNum */
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err = DetermineVRefNum(dstPathname, dstVRefNum, &dstVRefNum);
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if ( err != noErr )
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{
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goto ErrorExit;
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}
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/* See if PBHCopyFile can be used. Using PBHCopyFile saves time by letting the file server
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** copy the file if the source and destination locations are on the same file server. */
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tempLong = sizeof(infoBuffer);
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err = HGetVolParms(srcName, srcVRefNum, &infoBuffer, &tempLong);
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if ( (err != noErr) && (err != paramErr) )
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{
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return ( err );
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}
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if ( (err != paramErr) && hasCopyFile(&infoBuffer) )
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{
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/* The source volume supports PBHCopyFile. */
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srcServerAdr = infoBuffer.vMServerAdr;
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/* Now, see if the destination volume is on the same file server. */
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tempLong = sizeof(infoBuffer);
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err = HGetVolParms(NULL, dstVRefNum, &infoBuffer, &tempLong);
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if ( (err != noErr) && (err != paramErr) )
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{
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return ( err );
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}
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if ( (err != paramErr) && (srcServerAdr == infoBuffer.vMServerAdr) )
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{
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/* Source and Dest are on same server and PBHCopyFile is supported. Copy with CopyFile. */
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err = HCopyFile(srcVRefNum, srcDirID, srcName, dstVRefNum, dstDirID, NULL, copyName);
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if ( err != noErr )
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{
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return ( err );
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}
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/* AppleShare's CopyFile clears the isAlias bit, so I still need to attempt to copy
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the File's attributes to attempt to get things right. */
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if ( copyName != NULL ) /* Did caller supply copy file name? */
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{
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/* Yes, use the caller supplied copy file name. */
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(void) CopyFileMgrAttributes(srcVRefNum, srcDirID, srcName,
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dstVRefNum, dstDirID, copyName, true);
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}
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else
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{
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/* They didn't, so get the source file name and use it. */
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if ( GetFilenameFromPathname(srcName, dstName) == noErr )
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{
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/* */
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(void) CopyFileMgrAttributes(srcVRefNum, srcDirID, srcName,
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dstVRefNum, dstDirID, dstName, true);
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}
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}
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return ( err );
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}
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}
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/* If we're here, then PBHCopyFile couldn't be used so we have to copy the file by hand. */
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/* Make sure a copy buffer is allocated. */
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if ( copyBufferPtr == NULL )
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{
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/* The caller didn't supply a copy buffer so grab one from the application heap.
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** Try to get a big copy buffer, if we can't, try for a 512-byte buffer.
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** If 512 bytes aren't available, we're in trouble. */
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copyBufferSize = bigCopyBuffSize;
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copyBufferPtr = NewPtr(copyBufferSize);
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if ( copyBufferPtr == NULL )
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{
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copyBufferSize = minCopyBuffSize;
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copyBufferPtr = NewPtr(copyBufferSize);
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if ( copyBufferPtr == NULL )
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{
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return ( memFullErr );
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}
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}
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ourCopyBuffer = true;
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}
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/* Open the source data fork. */
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err = HOpenAware(srcVRefNum, srcDirID, srcName, srcCopyMode, &srcRefNum);
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if ( err != noErr )
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return ( err );
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/* Once a file is opened, we have to exit via ErrorExit to make sure things are cleaned up */
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/* See if the copy will be renamed. */
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if ( copyName != NULL ) /* Did caller supply copy file name? */
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BlockMoveData(copyName, dstName, copyName[0] + 1); /* Yes, use the caller supplied copy file name. */
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else
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{ /* They didn't, so get the source file name and use it. */
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err = GetFileLocation(srcRefNum, &tempInt, &tempLong, dstName);
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if ( err != noErr )
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{
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goto ErrorExit;
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}
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}
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/* Create the destination file. */
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err = HCreateMinimum(dstVRefNum, dstDirID, dstName);
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if ( err != noErr )
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{
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goto ErrorExit;
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}
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dstCreated = true; /* After creating the destination file, any
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** error conditions should delete the destination file */
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/* An AppleShare dropbox folder is a folder for which the user has the Make Changes
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** privilege (write access), but not See Files (read access) and See Folders (search access).
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** Copying a file into an AppleShare dropbox presents some special problems. Here are the
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** rules we have to follow to copy a file into a dropbox:
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** ¥ File attributes can be changed only when both forks of a file are empty.
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** ¥ DeskTop Manager comments can be added to a file only when both forks of a file
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** are empty.
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** ¥ A fork can be opened for write access only when both forks of a file are empty.
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** So, with those rules to live with, we'll do those operations now while both forks
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** are empty. */
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if ( isDropBox )
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{
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/* We only set the file attributes now if the file is being copied into a
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** drop box. In all other cases, it is better to set the attributes last
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** so that if FileCopy is modified to give up time to other processes
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** periodicly, the Finder won't try to read any bundle information (because
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** the bundle-bit will still be clear) from a partially copied file. If the
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** copy is into a drop box, we have to set the attributes now, but since the
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** destination forks are opened with write/deny-read/deny-write permissions,
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** any Finder that might see the file in the drop box won't be able to open
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** its resource fork until the resource fork is closed.
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**
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** Note: if you do modify FileCopy to give up time to other processes, don't
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** give up time between the time the destination file is created (above) and
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** the time both forks are opened (below). That way, you stand the best chance
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** of making sure the Finder doesn't read a partially copied resource fork.
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*/
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/* Copy attributes but don't lock the destination. */
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err = CopyFileMgrAttributes(srcVRefNum, srcDirID, srcName,
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dstVRefNum, dstDirID, dstName, false);
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if ( err != noErr )
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{
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goto ErrorExit;
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}
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}
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/* Attempt to copy the comments while both forks are empty.
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** Ignore the result because we really don't care if it worked or not. */
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(void) DTCopyComment(srcVRefNum, srcDirID, srcName, dstVRefNum, dstDirID, dstName);
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/* See which forks we need to copy. By doing this, we won't create a data or resource fork
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** for the destination unless it's really needed (some foreign file systems such as
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** the ProDOS File System and Macintosh PC Exchange have to create additional disk
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** structures to support resource forks). */
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err = CheckForForks(srcVRefNum, srcDirID, srcName, &hasDataFork, &hasResourceFork);
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if ( err != noErr )
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{
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goto ErrorExit;
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}
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if ( hasDataFork )
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{
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/* Open the destination data fork. */
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err = HOpenAware(dstVRefNum, dstDirID, dstName, dstCopyMode, &dstDataRefNum);
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if ( err != noErr )
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{
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goto ErrorExit;
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}
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}
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if ( hasResourceFork )
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{
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/* Open the destination resource fork. */
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err = HOpenRFAware(dstVRefNum, dstDirID, dstName, dstCopyMode, &dstRsrcRefNum);
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if ( err != noErr )
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{
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goto ErrorExit;
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|
}
|
|
}
|
|
|
|
if ( hasDataFork )
|
|
{
|
|
/* Copy the data fork. */
|
|
err = CopyFork(srcRefNum, dstDataRefNum, copyBufferPtr, copyBufferSize);
|
|
if ( err != noErr )
|
|
{
|
|
goto ErrorExit;
|
|
}
|
|
|
|
/* Close both data forks and clear reference numbers. */
|
|
(void) FSClose(srcRefNum);
|
|
(void) FSClose(dstDataRefNum);
|
|
srcRefNum = dstDataRefNum = 0;
|
|
}
|
|
else
|
|
{
|
|
/* Close the source data fork since it was opened earlier */
|
|
(void) FSClose(srcRefNum);
|
|
srcRefNum = 0;
|
|
}
|
|
|
|
if ( hasResourceFork )
|
|
{
|
|
/* Open the source resource fork. */
|
|
err = HOpenRFAware(srcVRefNum, srcDirID, srcName, srcCopyMode, &srcRefNum);
|
|
if ( err != noErr )
|
|
{
|
|
goto ErrorExit;
|
|
}
|
|
|
|
/* Copy the resource fork. */
|
|
err = CopyFork(srcRefNum, dstRsrcRefNum, copyBufferPtr, copyBufferSize);
|
|
if ( err != noErr )
|
|
{
|
|
goto ErrorExit;
|
|
}
|
|
|
|
/* Close both resource forks and clear reference numbers. */
|
|
(void) FSClose(srcRefNum);
|
|
(void) FSClose(dstRsrcRefNum);
|
|
srcRefNum = dstRsrcRefNum = 0;
|
|
}
|
|
|
|
/* Get rid of the copy buffer if we allocated it. */
|
|
if ( ourCopyBuffer )
|
|
{
|
|
DisposePtr((Ptr)copyBufferPtr);
|
|
}
|
|
|
|
/* Attempt to copy attributes again to set mod date. Copy lock condition this time
|
|
** since we're done with the copy operation. This operation will fail if we're copying
|
|
** into an AppleShare dropbox, so we don't check for error conditions. */
|
|
CopyFileMgrAttributes(srcVRefNum, srcDirID, srcName,
|
|
dstVRefNum, dstDirID, dstName, true);
|
|
|
|
/* Hey, we did it! */
|
|
return ( noErr );
|
|
|
|
ErrorExit:
|
|
if ( srcRefNum != 0 )
|
|
{
|
|
(void) FSClose(srcRefNum); /* Close the source file */
|
|
}
|
|
if ( dstDataRefNum != 0 )
|
|
{
|
|
(void) FSClose(dstDataRefNum); /* Close the destination file data fork */
|
|
}
|
|
if ( dstRsrcRefNum != 0 )
|
|
{
|
|
(void) FSClose(dstRsrcRefNum); /* Close the destination file resource fork */
|
|
}
|
|
if ( dstCreated )
|
|
{
|
|
(void) HDelete(dstVRefNum, dstDirID, dstName); /* Delete dest file. This may fail if the file
|
|
is in a "drop folder" */
|
|
}
|
|
if ( ourCopyBuffer ) /* dispose of any memory we allocated */
|
|
{
|
|
DisposePtr((Ptr)copyBufferPtr);
|
|
}
|
|
|
|
return ( err );
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
|
|
pascal OSErr FSpFileCopy(const FSSpec *srcSpec,
|
|
const FSSpec *dstSpec,
|
|
ConstStr255Param copyName,
|
|
void *copyBufferPtr,
|
|
long copyBufferSize,
|
|
Boolean preflight)
|
|
{
|
|
return ( FileCopy(srcSpec->vRefNum, srcSpec->parID, srcSpec->name,
|
|
dstSpec->vRefNum, dstSpec->parID, dstSpec->name,
|
|
copyName, copyBufferPtr, copyBufferSize, preflight) );
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
|