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145 lines
4.4 KiB
C
145 lines
4.4 KiB
C
/*
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File: FoldersGlue.c
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Contains: FindFolder (also known as Folder Manager) glue for 7.0 Apps
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that will allow them to run on 6.0 also.
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Written by: Prashant Patel
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Copyright: © 1990-1991 by Apple Computer, Inc., all rights reserved.
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Change History (most recent first):
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<4> 11/14/91 JL Had to change ifndef of SystemSevenOrLater to If it was false
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because it's always defined in Types.h.
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<3> 11/13/91 JL Changed kSupportSysDir to kNoSupportsSysDir and changed logic to
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check for System Folder support. The 17th bit of vMAttrib is set
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if there is no support - the logic got confusing. This fixes the
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bug about not recognizing a System Folder on a drive that has
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one.
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<2> 11/4/91 JSM Conditionalize glue for pre-System 7 only.
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<1> 11/13/90 PP (PP/dba) first checked in
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*/
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#include <Folders.h>
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#include <GestaltEqu.h>
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#include <SysEqu.h>
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#include <Errors.h>
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#include <Files.h>
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/* Real FindFolder Trap in Sys 7.0. */
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pascal OSErr
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__FindFolder(short vRefNum, OSType, Boolean createFolder, short* foundVRefNum, long* foundDirID)
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= { 0x7000, 0xA823 };
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#if !(SystemSevenOrLater)
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/* need glue for FindFolder for pre-7.0 systems */
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/* Global Reference number of system resource file (word) */
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#define SYSMAP (* (short *) SysMap)
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#define kNoSupportsSysDir (1<<17) // Does volume support System Folder? <3>
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typedef struct
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{ // GetVolParms buffer
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short version;
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long attributes;
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} VolParmsBuf;
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pascal OSErr FindFolder(short vRefNum,
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OSType folderType,
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Boolean createFolder,
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short* foundVRefNum,
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long* foundDirID)
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{
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OSErr error; // return code
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long result; // Gestalt result
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Boolean findFolderPresent = false;
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HParamBlockRec hpb; // generic h Param Block
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VolParmsBuf volumeParms; // answer from GetVolParms
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/* Determine if real FindFolder is present or not. */
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error = Gestalt( gestaltFindFolderAttr, &result );
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if (error == noErr)
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{
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if (result & (1<<gestaltFindFolderPresent))
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findFolderPresent = true;
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}
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if (findFolderPresent)
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return (__FindFolder(vRefNum, folderType, createFolder, foundVRefNum, foundDirID));
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else
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{
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/* Folders that do not reside in System Folder are not valid for 6.0.
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In such a case, return paramErr.
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*/
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if (folderType != kSystemFolderType &&
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folderType != kTemporaryFolderType &&
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folderType != kPreferencesFolderType &&
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folderType != kExtensionFolderType &&
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folderType != kControlPanelFolderType &&
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folderType != kAppleMenuFolderType &&
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folderType != kStartupFolderType &&
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folderType != kPrintMonitorDocsFolderType)
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return (paramErr);
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hpb.fileParam.ioNamePtr = nil; // not interested in name
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if (vRefNum == (short)kOnSystemDisk) // vRefNum of Boot disk
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{
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/* Get vRefNum of the System disk. HParamBlockRec mapped to FCBPBRec. */
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hpb.fileParam.ioFRefNum = SYSMAP; // the system file's refNum
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hpb.fileParam.ioFDirIndex = 0; // get file by refNum
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(*(FCBPBPtr)&hpb).ioFCBParID = fsRtDirID; // init in case of an MFS disk
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error = PBGetFCBInfoSync ((FCBPBPtr) &hpb);
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if (error != noErr)
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goto EXIT;
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/* cooked vRefNum is returned in ioFCBVRefNum. */
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hpb.volumeParam.ioVRefNum = (*(FCBPBPtr)&hpb).ioFCBVRefNum;
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}
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else
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hpb.volumeParam.ioVRefNum = vRefNum;
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/* Get volume params for this disk, specially the attributes bits. */
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hpb.ioParam.ioReqCount = sizeof (VolParmsBuf); // size of return buffer
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hpb.ioParam.ioBuffer = (Ptr) &volumeParms; // pointer to return buffer
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error = PBHGetVolParmsSync (&hpb);
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if (error == paramErr || // just lack of PBHGetVolParms
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(error == noErr && !(volumeParms.attributes & kNoSupportsSysDir))) // System Folder supported <3>
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{
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/* Get cooked vRefNum and System Folder dirID by calling HGetVInfo. */
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hpb.volumeParam.ioVolIndex = 0; // get info by vRefNum
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hpb.volumeParam.ioVFndrInfo[0] = 0; // init in case of an MFS disk
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hpb.fileParam.ioDirID = 0; // *** bug related to changing working Dir???
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error = PBHGetVInfoSync (&hpb);
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if (error != noErr)
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goto EXIT;
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if (hpb.volumeParam.ioVFndrInfo[0] != 0) // System Folder dirID on this disk
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{
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*foundVRefNum = hpb.volumeParam.ioVRefNum; // cooked vRefNum is returned
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*foundDirID = hpb.volumeParam.ioVFndrInfo[0]; // System Folder dirID on this disk
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}
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else
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error = fnfErr;
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}
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else if (error == noErr)
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error = fnfErr;
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}
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EXIT:
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return (error);
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}
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#endif |