/*

 * Mac OS X support routines for PhysicsFS.

 *

 * Please see the file LICENSE.txt in the source's root directory.

 *

 *  This file written by Ryan C. Gordon.

 */

#define __PHYSICSFS_INTERNAL__

#include "physfs_platforms.h"

#ifdef PHYSFS_PLATFORM_MACOSX

#include <CoreFoundation/CoreFoundation.h>

#if !defined(PHYSFS_NO_CDROM_SUPPORT)

#include <Carbon/Carbon.h>  /* !!! FIXME */

#include <IOKit/storage/IOMedia.h>

#include <IOKit/storage/IOCDMedia.h>

#include <IOKit/storage/IODVDMedia.h>

#include <sys/mount.h>

#endif

/* Seems to get defined in some system header... */

#ifdef Free

#undef Free

#endif

#include "physfs_internal.h"

#if defined(__APPLE__)

#if defined(TARGET_OS_MAC) && MAC_OS_X_VERSION_MAX_ALLOWED <= MAC_OS_X_VERSION_10_4

/* __eprintf shouldn't have been made visible from libstdc++, or anywhere, but

   on Mac OS X 10.4 it was defined in libstdc++.6.0.3.dylib; so on that platform

   we have to keep defining it to keep binary compatibility.

   We can't just put the libgcc version in the export list, because that

   doesn't work; once a symbol is marked as hidden, it stays that way.  */

void __eprintf (const char *string, const char *expression,

	        unsigned int line, const char *filename)

{

    fprintf(stderr, string, expression, line, filename);

    fflush(stderr);

    abort();

}

/* apparently libssp is missing from 10.4 SDK

   code from http://wiki.osdev.org/GCC_Stack_Smashing_Protector */

void * __stack_chk_guard = NULL;

void __stack_chk_guard_setup()

{

    unsigned char * p;

    p = (unsigned char *) &__stack_chk_guard;

    /* If you have the ability to generate random numbers in your kernel then use them,

       otherwise for 32-bit code: *p = 0x00000aff; */

    *p = random();

}

void __attribute__((noreturn)) __stack_chk_fail()

{

    /* put your panic function or similar in here */

    unsigned char * vid = (unsigned char *)0xB8000;

    vid[1] = 7;

    for(;;)

    vid[0]++;

}

#endif

#endif /* __APPLE__ */

/* Wrap PHYSFS_Allocator in a CFAllocator... */

static CFAllocatorRef cfallocator = NULL;

static CFStringRef cfallocDesc(const void *info)

{

    return CFStringCreateWithCString(cfallocator, "PhysicsFS",

                                     kCFStringEncodingASCII);

} /* cfallocDesc */

static void *cfallocMalloc(CFIndex allocSize, CFOptionFlags hint, void *info)

{

    return allocator.Malloc(allocSize);

} /* cfallocMalloc */

static void cfallocFree(void *ptr, void *info)

{

    allocator.Free(ptr);

} /* cfallocFree */

static void *cfallocRealloc(void *ptr, CFIndex newsize,

                            CFOptionFlags hint, void *info)

{

    if ((ptr == NULL) || (newsize <= 0))

        return NULL;  /* ADC docs say you should always return NULL here. */

    return allocator.Realloc(ptr, newsize);

} /* cfallocRealloc */

int __PHYSFS_platformInit(void)

{

    /* set up a CFAllocator, so Carbon can use the physfs allocator, too. */

    CFAllocatorContext ctx;

    memset(&ctx, '\0', sizeof (ctx));

    ctx.copyDescription = cfallocDesc;

    ctx.allocate = cfallocMalloc;

    ctx.reallocate = cfallocRealloc;

    ctx.deallocate = cfallocFree;

    cfallocator = CFAllocatorCreate(kCFAllocatorUseContext, &ctx);

    BAIL_IF_MACRO(!cfallocator, PHYSFS_ERR_OUT_OF_MEMORY, 0);

    return 1;  /* success. */

} /* __PHYSFS_platformInit */

int __PHYSFS_platformDeinit(void)

{

    CFRelease(cfallocator);

    cfallocator = NULL;

    return 1;  /* always succeed. */

} /* __PHYSFS_platformDeinit */

/* CD-ROM detection code... */

/*

 * Code based on sample from Apple Developer Connection:

 *  http://developer.apple.com/samplecode/Sample_Code/Devices_and_Hardware/Disks/VolumeToBSDNode/VolumeToBSDNode.c.htm

 */

#if !defined(PHYSFS_NO_CDROM_SUPPORT)

static int darwinIsWholeMedia(io_service_t service)

{

    int retval = 0;

    CFTypeRef wholeMedia;

    if (!IOObjectConformsTo(service, kIOMediaClass))

        return 0;

    wholeMedia = IORegistryEntryCreateCFProperty(service,

                                                 CFSTR(kIOMediaWholeKey),

                                                 cfallocator, 0);

    if (wholeMedia == NULL)

        return 0;

    retval = CFBooleanGetValue(wholeMedia);

    CFRelease(wholeMedia);

    return retval;

} /* darwinIsWholeMedia */

static int darwinIsMountedDisc(char *bsdName, mach_port_t masterPort)

{

    int retval = 0;

    CFMutableDictionaryRef matchingDict;

    kern_return_t rc;

    io_iterator_t iter;

    io_service_t service;

    if ((matchingDict = IOBSDNameMatching(masterPort, 0, bsdName)) == NULL)

        return 0;

    rc = IOServiceGetMatchingServices(masterPort, matchingDict, &iter);

    if ((rc != KERN_SUCCESS) || (!iter))

        return 0;

    service = IOIteratorNext(iter);

    IOObjectRelease(iter);

    if (!service)

        return 0;

    rc = IORegistryEntryCreateIterator(service, kIOServicePlane,

             kIORegistryIterateRecursively | kIORegistryIterateParents, &iter);

    if (!iter)

        return 0;

    if (rc != KERN_SUCCESS)

    {

        IOObjectRelease(iter);

        return 0;

    } /* if */

    IOObjectRetain(service);  /* add an extra object reference... */

    do

    {

        if (darwinIsWholeMedia(service))

        {

            if ( (IOObjectConformsTo(service, kIOCDMediaClass)) ||

                 (IOObjectConformsTo(service, kIODVDMediaClass)) )

            {

                retval = 1;

            } /* if */

        } /* if */

        IOObjectRelease(service);

    } while ((service = IOIteratorNext(iter)) && (!retval));

    IOObjectRelease(iter);

    IOObjectRelease(service);

    return retval;

} /* darwinIsMountedDisc */

#endif /* !defined(PHYSFS_NO_CDROM_SUPPORT) */

void __PHYSFS_platformDetectAvailableCDs(PHYSFS_StringCallback cb, void *data)

{

#if !defined(PHYSFS_NO_CDROM_SUPPORT)

    const char *devPrefix = "/dev/";

    const int prefixLen = strlen(devPrefix);

    mach_port_t masterPort = 0;

    struct statfs *mntbufp;

    int i, mounts;

    if (IOMasterPort(MACH_PORT_NULL, &masterPort) != KERN_SUCCESS)

        BAIL_MACRO(PHYSFS_ERR_OS_ERROR, ) /*return void*/;

    mounts = getmntinfo(&mntbufp, MNT_WAIT);  /* NOT THREAD SAFE! */

    for (i = 0; i < mounts; i++)

    {

        char *dev = mntbufp[i].f_mntfromname;

        char *mnt = mntbufp[i].f_mntonname;

        if (strncmp(dev, devPrefix, prefixLen) != 0)  /* a virtual device? */

            continue;

        dev += prefixLen;

        if (darwinIsMountedDisc(dev, masterPort))

            cb(data, mnt);

    } /* for */

#endif /* !defined(PHYSFS_NO_CDROM_SUPPORT) */

} /* __PHYSFS_platformDetectAvailableCDs */

static char *convertCFString(CFStringRef cfstr)

{

    CFIndex len = CFStringGetMaximumSizeForEncoding(CFStringGetLength(cfstr),

                                                    kCFStringEncodingUTF8) + 1;

    char *retval = (char *) allocator.Malloc(len);

    BAIL_IF_MACRO(!retval, PHYSFS_ERR_OUT_OF_MEMORY, NULL);

    if (CFStringGetCString(cfstr, retval, len, kCFStringEncodingUTF8))

    {

        /* shrink overallocated buffer if possible... */

        CFIndex newlen = strlen(retval) + 1;

        if (newlen < len)

        {

            void *ptr = allocator.Realloc(retval, newlen);

            if (ptr != NULL)

                retval = (char *) ptr;

        } /* if */

    } /* if */

    else  /* probably shouldn't fail, but just in case... */

    {

        allocator.Free(retval);

        BAIL_MACRO(PHYSFS_ERR_OUT_OF_MEMORY, NULL);

    } /* else */

    return retval;

} /* convertCFString */

char *__PHYSFS_platformCalcBaseDir(const char *argv0)

{

    CFURLRef cfurl = NULL;

    CFStringRef cfstr = NULL;

    CFMutableStringRef cfmutstr = NULL;

    char *retval = NULL;

    cfurl = CFBundleCopyBundleURL(CFBundleGetMainBundle());

    BAIL_IF_MACRO(cfurl == NULL, PHYSFS_ERR_OS_ERROR, NULL);

    cfstr = CFURLCopyFileSystemPath(cfurl, kCFURLPOSIXPathStyle);

    CFRelease(cfurl);

    BAIL_IF_MACRO(!cfstr, PHYSFS_ERR_OUT_OF_MEMORY, NULL);

    cfmutstr = CFStringCreateMutableCopy(cfallocator, 0, cfstr);

    CFRelease(cfstr);

    BAIL_IF_MACRO(!cfmutstr, PHYSFS_ERR_OUT_OF_MEMORY, NULL);

    CFStringAppendCString(cfmutstr, "/", kCFStringEncodingUTF8);

    retval = convertCFString(cfmutstr);

    CFRelease(cfmutstr);

    return retval;  /* whew. */

} /* __PHYSFS_platformCalcBaseDir */

char *__PHYSFS_platformCalcPrefDir(const char *org, const char *app)

{

    /* !!! FIXME: there's a real API to determine this */

    const char *userdir = __PHYSFS_getUserDir();

    const char *append = "Library/Application Support/";

    const size_t len = strlen(userdir) + strlen(append) + strlen(app) + 2;

    char *retval = allocator.Malloc(len);

    BAIL_IF_MACRO(!retval, PHYSFS_ERR_OUT_OF_MEMORY, NULL);

    snprintf(retval, len, "%s%s%s/", userdir, append, app);

    return retval;

} /* __PHYSFS_platformCalcPrefDir */

/* Platform allocator uses default CFAllocator at PHYSFS_init() time. */

static CFAllocatorRef cfallocdef = NULL;

static int macosxAllocatorInit(void)

{

    int retval = 0;

    cfallocdef = CFAllocatorGetDefault();

    retval = (cfallocdef != NULL);

    if (retval)

        CFRetain(cfallocdef);

    return retval;

} /* macosxAllocatorInit */

static void macosxAllocatorDeinit(void)

{

    if (cfallocdef != NULL)

    {

        CFRelease(cfallocdef);

        cfallocdef = NULL;

    } /* if */

} /* macosxAllocatorDeinit */

static void *macosxAllocatorMalloc(PHYSFS_uint64 s)

{

    if (!__PHYSFS_ui64FitsAddressSpace(s))

        BAIL_MACRO(PHYSFS_ERR_OUT_OF_MEMORY, NULL);

    return CFAllocatorAllocate(cfallocdef, (CFIndex) s, 0);

} /* macosxAllocatorMalloc */

static void *macosxAllocatorRealloc(void *ptr, PHYSFS_uint64 s)

{

    if (!__PHYSFS_ui64FitsAddressSpace(s))

        BAIL_MACRO(PHYSFS_ERR_OUT_OF_MEMORY, NULL);

    return CFAllocatorReallocate(cfallocdef, ptr, (CFIndex) s, 0);

} /* macosxAllocatorRealloc */

static void macosxAllocatorFree(void *ptr)

{

    CFAllocatorDeallocate(cfallocdef, ptr);

} /* macosxAllocatorFree */

int __PHYSFS_platformSetDefaultAllocator(PHYSFS_Allocator *a)

{

    allocator.Init = macosxAllocatorInit;

    allocator.Deinit = macosxAllocatorDeinit;

    allocator.Malloc = macosxAllocatorMalloc;

    allocator.Realloc = macosxAllocatorRealloc;

    allocator.Free = macosxAllocatorFree;

    return 1;  /* return non-zero: we're supplying custom allocator. */

} /* __PHYSFS_platformSetDefaultAllocator */

#endif /* PHYSFS_PLATFORM_MACOSX */

/* end of macosx.c ... */