macclassic.c

嵌入式环境下的GUI

/*
 * MacOS Classic support routines for PhysicsFS.
 *
 * Please see the file LICENSE in the source's root directory.
 *
 *  This file written by Ryan C. Gordon.
 */

#if HAVE_CONFIG_H
#  include <config.h>
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <alloca.h>

/*
 * Most of the API calls in here are, according to ADC, available since
 *  MacOS 8.1. I don't think I used any MacOS 9 or CarbonLib-specific
 *  functions. There might be one or two 8.5 calls, and perhaps when the
 *  ADC docs say "Available in MacOS 8.1" they really mean "this works
 *  with System 6, but we don't want to hear about it at this point."
 *
 * IsAliasFile() showed up in MacOS 8.5. You can duplicate this code with
 *  PBGetCatInfoSync(), which is an older API, if you hope the bits in the
 *  catalog info never change (which they won't for, say, MacOS 8.1).
 *  See Apple Technote FL-30:
 *    http://developer.apple.com/technotes/fl/fl_30.html
 *
 * If you want to use weak pointers and Gestalt, and choose the correct
 *  code to use during __PHYSFS_platformInit(), I'll accept a patch, but
 *  chances are, it wasn't worth the time it took to write this, let alone
 *  implement that.
 */


/*
 * Please note that I haven't tried this code with CarbonLib or under
 *  MacOS X at all. The code in unix.c is known to work with Darwin,
 *  and you may or may not be better off using that, especially since
 *  mutexes are no-ops in this file. Patches welcome.
 */
#ifdef __PHYSFS_CARBONIZED__  /* this is currently not defined anywhere. */
#include <Carbon.h>
#else
#include <OSUtils.h>
#include <Processes.h>
#include <Files.h>
#include <TextUtils.h>
#include <Resources.h>
#include <MacMemory.h>
#include <Events.h>
#include <DriverGestalt.h>
#include <Aliases.h>
#endif

#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"


const char *__PHYSFS_platformDirSeparator = ":";


static const char *get_macos_error_string(OSErr err)
{
    if (err == noErr)
        return(NULL);

    switch (err)
    {
        case fnfErr: return(ERR_NO_SUCH_FILE);
        case notOpenErr: return(ERR_NO_SUCH_VOLUME);
        case dirFulErr: return(ERR_DIRECTORY_FULL);
        case dskFulErr: return(ERR_DISK_FULL);
        case nsvErr: return(ERR_NO_SUCH_VOLUME);
        case ioErr: return(ERR_IO_ERROR);
        case bdNamErr: return(ERR_BAD_FILENAME);
        case fnOpnErr: return(ERR_NOT_A_HANDLE);
        case eofErr: return(ERR_PAST_EOF);
        case posErr: return(ERR_SEEK_OUT_OF_RANGE);
        case tmfoErr: return(ERR_TOO_MANY_HANDLES);
        case wPrErr: return(ERR_VOL_LOCKED_HW);
        case fLckdErr: return(ERR_FILE_LOCKED);
        case vLckdErr: return(ERR_VOL_LOCKED_SW);
        case fBsyErr: return(ERR_FILE_OR_DIR_BUSY);
        case dupFNErr: return(ERR_FILE_EXISTS);
        case opWrErr: return(ERR_FILE_ALREADY_OPEN_W);
        case rfNumErr: return(ERR_INVALID_REFNUM);
        case gfpErr: return(ERR_GETTING_FILE_POS);
        case volOffLinErr: return(ERR_VOLUME_OFFLINE);
        case permErr: return(ERR_PERMISSION_DENIED);
        case volOnLinErr: return(ERR_VOL_ALREADY_ONLINE);
        case nsDrvErr: return(ERR_NO_SUCH_DRIVE);
        case noMacDskErr: return(ERR_NOT_MAC_DISK);
        case extFSErr: return(ERR_VOL_EXTERNAL_FS);
        case fsRnErr: return(ERR_PROBLEM_RENAME);
        case badMDBErr: return(ERR_BAD_MASTER_BLOCK);
        case wrPermErr: return(ERR_PERMISSION_DENIED);
        case memFullErr: return(ERR_OUT_OF_MEMORY);
        case dirNFErr: return(ERR_NO_SUCH_PATH);
        case tmwdoErr: return(ERR_TOO_MANY_HANDLES);
        case badMovErr: return(ERR_CANT_MOVE_FORBIDDEN);
        case wrgVolTypErr: return(ERR_WRONG_VOL_TYPE);
        case volGoneErr: return(ERR_SERVER_VOL_LOST);
        case errFSNameTooLong: return(ERR_BAD_FILENAME);
        case errFSNotAFolder: return(ERR_NOT_A_DIR);
        /*case errFSNotAFile: return(ERR_NOT_A_FILE);*/
        case fidNotFound: return(ERR_FILE_ID_NOT_FOUND);
        case fidExists: return(ERR_FILE_ID_EXISTS);
        case afpAccessDenied: return(ERR_ACCESS_DENIED);
        case afpNoServer: return(ERR_SERVER_NO_RESPOND);
        case afpUserNotAuth: return(ERR_USER_AUTH_FAILED);
        case afpPwdExpiredErr: return(ERR_PWORD_EXPIRED);

        case paramErr:
        case errFSBadFSRef:
        case errFSBadBuffer:
        case errFSMissingName:
        case errFSBadPosMode:
        case errFSBadAllocFlags:
        case errFSBadItemCount:
        case errFSBadSearchParams:
        case afpDenyConflict:
            return(ERR_PHYSFS_BAD_OS_CALL);

        default: return(ERR_MACOS_GENERIC);
    } /* switch */

    return(NULL);
} /* get_macos_error_string */


static OSErr oserr(OSErr retval)
{
    char buf[sizeof (ERR_MACOS_GENERIC) + 32];
    const char *errstr = get_macos_error_string(retval);
    if (strcmp(errstr, ERR_MACOS_GENERIC) == 0)
    {
        snprintf(buf, sizeof (buf), ERR_MACOS_GENERIC, (int) retval);
        errstr = buf;
    } /* if */

    if (errstr != NULL)
        __PHYSFS_setError(errstr);

    return(retval);
} /* oserr */


static struct ProcessInfoRec procInfo;
static FSSpec procfsspec;

int __PHYSFS_platformInit(void)
{
    OSErr err;
    ProcessSerialNumber psn;
    BAIL_IF_MACRO(oserr(GetCurrentProcess(&psn)) != noErr, NULL, 0);
    memset(&procInfo, '\0', sizeof (ProcessInfoRec));
    memset(&procfsspec, '\0', sizeof (FSSpec));
    procInfo.processInfoLength = sizeof (ProcessInfoRec);
    procInfo.processAppSpec = &procfsspec;
    err = GetProcessInformation(&psn, &procInfo);
    BAIL_IF_MACRO(oserr(err) != noErr, NULL, 0);
    return(1);  /* we're golden. */
} /* __PHYSFS_platformInit */


int __PHYSFS_platformDeinit(void)
{
    return(1);  /* always succeed. */
} /* __PHYSFS_platformDeinit */


/* 
 * CD detection code is borrowed from Apple Technical Q&A DV18.
 *  http://developer.apple.com/qa/dv/dv18.html
 */
char **__PHYSFS_platformDetectAvailableCDs(void)
{
    DriverGestaltParam pb;
    DrvQEl *dqp;
    OSErr status;
    char **retval = (char **) malloc(sizeof (char *));
    int cd_count = 1;

    BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);

    *retval = NULL;

    pb.csCode = kDriverGestaltCode;
    pb.driverGestaltSelector = kdgDeviceType;
    dqp = (DrvQEl *) GetDrvQHdr()->qHead;

    while (dqp != NULL)
    {
        pb.ioCRefNum = dqp->dQRefNum;
        pb.ioVRefNum = dqp->dQDrive;
        status = PBStatusSync((ParmBlkPtr) &pb);
        if ((status == noErr) && (pb.driverGestaltResponse == kdgCDType))
        {
            Str63 volName;
            HParamBlockRec hpbr;
            memset(&hpbr, '\0', sizeof (HParamBlockRec));
            hpbr.volumeParam.ioNamePtr = volName;
            hpbr.volumeParam.ioVRefNum = dqp->dQDrive;
            hpbr.volumeParam.ioVolIndex = 0;
            if (PBHGetVInfoSync(&hpbr) == noErr)
            {
                char **tmp = realloc(retval, sizeof (char *) * (cd_count + 1));
                if (tmp)
                {
                    char *str = (char *) malloc(volName[0] + 1);
                    retval = tmp;
                    if (str != NULL)
                    {
                        memcpy(str, &volName[1], volName[0]);
                        str[volName[0]] = '\0';
                        retval[cd_count-1] = str;
                        cd_count++;
                    } /* if */
                } /* if */
            } /* if */
        } /* if */

        dqp = (DrvQEl *) dqp->qLink;
    } /* while */

    retval[cd_count - 1] = NULL;
    return(retval);
} /* __PHYSFS_platformDetectAvailableCDs */


static char *convFSSpecToPath(FSSpec *spec, int includeFile)
{
    char *ptr;
    char *retval = NULL;
    UInt32 retLength = 0;
    CInfoPBRec infoPB;
    Str255 str255;

    str255[0] = spec->name[0];
    memcpy(&str255[1], &spec->name[1], str255[0]);

    memset(&infoPB, '\0', sizeof (CInfoPBRec));
    infoPB.dirInfo.ioNamePtr = str255;          /* put name in here.         */
    infoPB.dirInfo.ioVRefNum = spec->vRefNum;   /* ID of bin's volume.       */ 
    infoPB.dirInfo.ioDrParID = spec->parID;     /* ID of bin's dir.          */
    infoPB.dirInfo.ioFDirIndex = (includeFile) ? 0 : -1;

    /* walk the tree back to the root dir (volume), building path string... */
    do
    {
        /* check parent dir of what we last looked at... */
        infoPB.dirInfo.ioDrDirID = infoPB.dirInfo.ioDrParID;
        if (oserr(PBGetCatInfoSync(&infoPB)) != noErr)
        {
            if (retval != NULL)
                free(retval);
            return(NULL);
        } /* if */

        infoPB.dirInfo.ioFDirIndex = -1;  /* look at parent dir next time. */

        /* allocate more space for the retval... */
        retLength += str255[0] + 1; /* + 1 for a ':' or null char... */
        ptr = (char *) malloc(retLength);
        if (ptr == NULL)
        {
            if (retval != NULL)
                free(retval);
            BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);
        } /* if */

        /* prepend new dir to retval and cleanup... */
        memcpy(ptr, &str255[1], str255[0]);
        ptr[str255[0]] = '\0';  /* null terminate it. */
        if (retval != NULL)
        {
            strcat(ptr, ":");
            strcat(ptr, retval);
            free(retval);
        } /* if */
        retval = ptr;
    } while (infoPB.dirInfo.ioDrDirID != fsRtDirID);

    return(retval);
} /* convFSSpecToPath */


char *__PHYSFS_platformCalcBaseDir(const char *argv0)
{
    FSSpec spec;
    
    /* Get the name of the binary's parent directory. */
    FSMakeFSSpec(procfsspec.vRefNum, procfsspec.parID, procfsspec.name, &spec);
    return(convFSSpecToPath(&spec, 0));
} /* __PHYSFS_platformCalcBaseDir */


char *__PHYSFS_platformGetUserName(void)
{
    char *retval = NULL;
    StringHandle strHandle;
    short origResourceFile = CurResFile();

    /* use the System resource file. */
    UseResFile(0);
    /* apparently, -16096 specifies the username. */
    strHandle = GetString(-16096);
    UseResFile(origResourceFile);
    BAIL_IF_MACRO(strHandle == NULL, NULL, NULL);

    HLock((Handle) strHandle);
    retval = (char *) malloc((*strHandle)[0] + 1);
    if (retval == NULL)
    {
        HUnlock((Handle) strHandle);
        BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);
    } /* if */
    memcpy(retval, &(*strHandle)[1], (*strHandle)[0]);
    retval[(*strHandle)[0]] = '\0';  /* null-terminate it. */
    HUnlock((Handle) strHandle);

    return(retval);
} /* __PHYSFS_platformGetUserName */


char *__PHYSFS_platformGetUserDir(void)
{
#if 0
    return(NULL);  /* bah...use default behaviour, I guess. */
#else
    /* (Hmm. Default behaviour is broken in the base library.  :)  )  */
    return(__PHYSFS_platformCalcBaseDir(NULL));
#endif
} /* __PHYSFS_platformGetUserDir */


PHYSFS_uint64 __PHYSFS_platformGetThreadID(void)
{
    return(1);  /* single threaded. */
} /* __PHYSFS_platformGetThreadID */


int __PHYSFS_platformStricmp(const char *x, const char *y)
{
    extern int _stricmp(const char *, const char *);
    return(_stricmp(x, y));  /* (*shrug*) */
} /* __PHYSFS_platformStricmp */


static OSErr fnameToFSSpecNoAlias(const char *fname, FSSpec *spec)
{
    OSErr err;
    Str255 str255;
    int needColon = (strchr(fname, ':') == NULL);
    int len = strlen(fname) + ((needColon) ? 1 : 0);
    if (len > 255)
        return(bdNamErr);

    /* !!! FIXME: What happens with relative pathnames? */

    str255[0] = len;
    memcpy(&str255[1], fname, len);

    /* probably just a volume name, which seems to need a ':' at the end. */
    if (needColon)
        str255[len] = ':';

    err = oserr(FSMakeFSSpec(0, 0, str255, spec));
    return(err);
} /* fnameToFSSpecNoAlias */


static OSErr fnameToFSSpec(const char *fname, FSSpec *spec)
{
    Boolean alias = 0;
    Boolean folder = 0;
    OSErr err = fnameToFSSpecNoAlias(fname, spec);

    if (err == dirNFErr)  /* might be an alias in the middle of the path. */
    {
        /* 
         * Has to be at least two ':' chars, or we wouldn't get a
         *  dir-not-found condition. (no ':' means it was just a volume,
         *  just one ':' means we would have gotten a fnfErr, if anything.
         */
        char *ptr;
        char *start;
        char *path = alloca(strlen(fname) + 1);
        strcpy(path, fname);
        ptr = strchr(path, ':');
        BAIL_IF_MACRO(!ptr, ERR_NO_SUCH_FILE, err); /* just in case */
        ptr = strchr(ptr + 1, ':');
        BAIL_IF_MACRO(!ptr, ERR_NO_SUCH_FILE, err); /* just in case */
        *ptr = '\0';
        err = fnameToFSSpecNoAlias(path, spec); /* get first dir. */
        BAIL_IF_MACRO(oserr(err) != noErr, NULL, err);
        start = ptr;
        ptr = strchr(start + 1, ':');

        /* Now check each element of the path for aliases... */
        do
        {
            CInfoPBRec infoPB;
            memset(&infoPB, '\0', sizeof (CInfoPBRec));
            infoPB.dirInfo.ioNamePtr = spec->name;
            infoPB.dirInfo.ioVRefNum = spec->vRefNum;
            infoPB.dirInfo.ioDrDirID = spec->parID;
            infoPB.dirInfo.ioFDirIndex = 0;
            err = PBGetCatInfoSync(&infoPB);
            if (err != noErr)  /* not an alias, really just a bogus path. */
                return(fnameToFSSpecNoAlias(fname, spec)); /* reset */

            if ((infoPB.dirInfo.ioFlAttrib & kioFlAttribDirMask) != 0)
                spec->parID = infoPB.dirInfo.ioDrDirID;

            if (ptr != NULL)  /* terminate string after next element. */
                *ptr = '\0';

            *start = strlen(start + 1);  /* make it a pstring. */
            err = FSMakeFSSpec(spec->vRefNum, spec->parID,
                               (const unsigned char *) start, spec);
            if (err != noErr)  /* not an alias, really a bogus path. */
                return(fnameToFSSpecNoAlias(fname, spec)); /* reset */

            err = ResolveAliasFileWithMountFlags(spec, 1, &folder, &alias, 0);
            if (err != noErr)  /* not an alias, really a bogus path. */
                return(fnameToFSSpecNoAlias(fname, spec)); /* reset */

            start = ptr;  /* move to the next element. */
            if (ptr != NULL)
                ptr = strchr(start + 1, ':');                
        } while (start != NULL);
    } /* if */

    else /* there's something there; make sure final file is not an alias. */
    {
        BAIL_IF_MACRO(oserr(err) != noErr, NULL, err);
        err = ResolveAliasFileWithMountFlags(spec, 1, &folder, &alias, 0);
        BAIL_IF_MACRO(oserr(err) != noErr, NULL, err);
    } /* else */

    return(noErr);  /* w00t. */
} /* fnameToFSSpec */


int __PHYSFS_platformExists(const char *fname)
{
    FSSpec spec;
    return(fnameToFSSpec(fname, &spec) == noErr);
} /* __PHYSFS_platformExists */