+[NSFileWrapper _canSafelyMapFilesAtPath:] recursively processes virtual disks(images) up to a root file system. It accepts an NSString object with a path to any file on a mounted image. Below is a pseudocode produced by Hopper Disassembler.
/* @class NSFileWrapper */
+(char)_canSafelyMapFilesAtPath:(void *)arg2 {
var_30 = **___stack_chk_guard;
r13 = [arg2 fileSystemRepresentation];
rax = statfs$INODE64(r13, &var_8A8);
if (rax == 0x0) goto loc_41cd2;
loc_41ca7:
rax = 0x0;
goto loc_41ca9;
loc_41ca9:
if (**___stack_chk_guard == var_30) {
rax = rax & 0xff;
}
else {
rax = __stack_chk_fail();
}
return rax;
loc_41cd2:
os_unfair_lock_lock(_volumeIsSafeForMapping.lock);
r14 = &var_450;
if ((*0x4c4b60 == 0x0) || (strcmp(*0x4c4b60, r14) != 0x0)) goto loc_41d01;
loc_41eb5:
os_unfair_lock_unlock(_volumeIsSafeForMapping.lock);
r12 = *(int8_t *)0x4c4b68;
goto loc_41f6f;
loc_41f6f:
if (r12 != 0x0) {
if (*0x4c4b80 != 0xffffffffffffffff) {
dispatch_once(0x4c4b80, ^ {/* block implemented at ___fileIsSafeForMapping_block_invoke */ } });
}
if (*0x4c4b78 != 0x0) {
rax = loc_4c4b78(r13, &var_1148);
rax = (var_1148 != 0x5 ? 0x1 : 0x0) & (rax == 0x0 ? 0x1 : 0x0);
}
else {
rax = 0x0;
}
}
else {
rax = 0x0;
}
goto loc_41ca9;
loc_41d01:
os_unfair_lock_unlock(_volumeIsSafeForMapping.lock);
rbx = [NSString stringWithCString:r14 encoding:0x4];
if ([rbx hasPrefix:@"/dev/"] == 0x0) goto loc_41ca7;
loc_41d4c:
rbx = [rbx substringFromIndex:0x5, 0x4];
if ([rbx length] == 0x0) goto loc_41ca7;
loc_41d77:
r14 = *(int32_t *)*_kIOMasterPortDefault;
rax = [rbx fileSystemRepresentation];
r12 = 0x0;
rax = IOBSDNameMatching(r14, 0x0, rax);
if (rax != 0x0) {
r14 = IOServiceGetMatchingService(r14, rax);
if (r14 != 0x0) {
r12 = 0x0;
rax = IORegistryEntrySearchCFProperty(r14, "IOService", @"Protocol Characteristics", 0x0, 0x3);
if (rax != 0x0) {
var_1150 = rax;
rbx = CFDictionaryGetValue(rax, @"Physical Interconnect Location");
if (rbx != 0x0) {
if (CFStringCompare(rbx, @"Internal", 0x0) != 0x0) {
r12 = 0x0;
rax = CFStringCompare(rbx, @"File", 0x0);
rbx = var_1150;
if (rax == 0x0) {
rbx = CFDictionaryGetValue(rbx, @"Virtual Interface Location Path");
if (rbx != 0x0) {
rbx = [[NSString alloc] initWithData:rbx encoding:0x4];
if ([rbx length] != 0x0) {
r12 = [NSFileWrapper _canSafelyMapFilesAtPath:rbx];
}
else {
r12 = 0x0;
}
rdi = rbx;
rbx = var_1150;
[rdi release];
}
else {
r12 = 0x0;
rbx = var_1150;
}
}
}
else {
r12 = 0x1;
rbx = var_1150;
}
}
else {
r12 = 0x0;
rbx = var_1150;
}
CFRelease(rbx);
}
IOObjectRelease(r14);
}
else {
r12 = 0x0;
}
}
*(&var_1128 - 0x20) = *__NSConcreteStackBlock;
*(int32_t *)(&var_1128 - 0x18) = 0xffffffffc0000000;
*(int32_t *)(&var_1128 - 0x14) = 0x0;
*(&var_1128 - 0x10) = ___volumeIsSafeForMapping_block_invoke;
*(&var_1128 - 0x8) = ___block_descriptor_tmp.528;
memcpy(&var_1128, &var_8A8, 0x878);
*(int8_t *)(&var_1128 + 0x878) = r12;
if (*0x4c4b70 != 0xffffffffffffffff) {
rax = dispatch_once(0x4c4b70, &var_1148);
}
goto loc_41f6f;
}
A disassembled function is below
+[NSFileWrapper _canSafelyMapFilesAtPath:]:
0000000000041c5c push rbp ; Objective C Implementation defined at 0x47ef68 (class method), DATA XREF=0x47ef68
0000000000041c5d mov rbp, rsp
0000000000041c60 push r15
0000000000041c62 push r14
0000000000041c64 push r13
0000000000041c66 push r12
0000000000041c68 push rbx
0000000000041c69 sub rsp, 0x1128
0000000000041c70 mov rax, qword [___stack_chk_guard_3c7428] ; ___stack_chk_guard_3c7428
0000000000041c77 mov rax, qword [rax]
0000000000041c7a mov qword [rbp+var_30], rax
0000000000041c7e mov r12, qword [0x4a2648] ; @selector(fileSystemRepresentation)
0000000000041c85 mov rdi, rdx ; argument "instance" for method _objc_msgSend
0000000000041c88 mov rsi, r12 ; argument "selector" for method _objc_msgSend
0000000000041c8b call qword [_objc_msgSend_3c7a08] ; _objc_msgSend, _objc_msgSend_3c7a08,_objc_msgSend
0000000000041c91 mov r13, rax
0000000000041c94 lea rsi, qword [rbp+var_8A8]
0000000000041c9b mov rdi, r13
0000000000041c9e call imp___stubs__statfs$INODE64 ; statfs$INODE64
0000000000041ca3 test eax, eax
0000000000041ca5 je loc_41cd2
loc_41ca7:
0000000000041ca7 xor eax, eax ; CODE XREF=+[NSFileWrapper _canSafelyMapFilesAtPath:]+234, +[NSFileWrapper _canSafelyMapFilesAtPath:]+277, +[NSFileWrapper _canSafelyMapFilesAtPath:]+790, +[NSFileWrapper _canSafelyMapFilesAtPath:]+816
loc_41ca9:
0000000000041ca9 mov rcx, qword [___stack_chk_guard_3c7428] ; ___stack_chk_guard_3c7428, CODE XREF=+[NSFileWrapper _canSafelyMapFilesAtPath:]+850
0000000000041cb0 mov rcx, qword [rcx]
0000000000041cb3 cmp rcx, qword [rbp+var_30]
0000000000041cb7 jne loc_41fdd
0000000000041cbd movzx eax, al
0000000000041cc0 add rsp, 0x1128
0000000000041cc7 pop rbx
0000000000041cc8 pop r12
0000000000041cca pop r13
0000000000041ccc pop r14
0000000000041cce pop r15
0000000000041cd0 pop rbp
0000000000041cd1 ret
; endp
loc_41cd2:
0000000000041cd2 lea rdi, qword [_volumeIsSafeForMapping.lock] ; argument "lock" for method imp___stubs__os_unfair_lock_lock, _volumeIsSafeForMapping.lock, CODE XREF=+[NSFileWrapper _canSafelyMapFilesAtPath:]+73
0000000000041cd9 call imp___stubs__os_unfair_lock_lock ; os_unfair_lock_lock
0000000000041cde mov rdi, qword [__prepareForDispatch.installedPreDispatchHandler+4096] ; 0x4c4b60
0000000000041ce5 test rdi, rdi
0000000000041ce8 lea r14, qword [rbp+var_450]
0000000000041cef je loc_41d01
0000000000041cf1 mov rsi, r14 ; argument "s2" for method imp___stubs__strcmp
0000000000041cf4 call imp___stubs__strcmp ; strcmp
0000000000041cf9 test eax, eax
0000000000041cfb je loc_41eb5
loc_41d01:
0000000000041d01 lea rdi, qword [_volumeIsSafeForMapping.lock] ; argument "lock" for method imp___stubs__os_unfair_lock_unlock, _volumeIsSafeForMapping.lock, CODE XREF=+[NSFileWrapper _canSafelyMapFilesAtPath:]+147
0000000000041d08 call imp___stubs__os_unfair_lock_unlock ; os_unfair_lock_unlock
0000000000041d0d mov rdi, qword [objc_cls_ref_NSString] ; argument "instance" for method _objc_msgSend, objc_cls_ref_NSString
0000000000041d14 mov rsi, qword [0x4a7490] ; argument "selector" for method _objc_msgSend, @selector(stringWithCString:encoding:)
0000000000041d1b mov r15, qword [_objc_msgSend_3c7a08] ; _objc_msgSend_3c7a08
0000000000041d22 mov ecx, 0x4
0000000000041d27 mov rdx, r14
0000000000041d2a call r15 ; Jumps to 0x6d63c0 (_objc_msgSend), _objc_msgSend
0000000000041d2d mov rbx, rax
0000000000041d30 mov rsi, qword [0x4a27a0] ; argument "selector" for method _objc_msgSend, @selector(hasPrefix:)
0000000000041d37 lea rdx, qword [cfstring__dev_] ; @"/dev/"
0000000000041d3e mov rdi, rbx ; argument "instance" for method _objc_msgSend
0000000000041d41 call r15 ; Jumps to 0x6d63c0 (_objc_msgSend), _objc_msgSend
0000000000041d44 test al, al
0000000000041d46 je loc_41ca7
0000000000041d4c mov rsi, qword [0x4a2e18] ; argument "selector" for method _objc_msgSend, @selector(substringFromIndex:)
0000000000041d53 mov edx, 0x5
0000000000041d58 mov rdi, rbx ; argument "instance" for method _objc_msgSend
0000000000041d5b call r15 ; Jumps to 0x6d63c0 (_objc_msgSend), _objc_msgSend
0000000000041d5e mov rbx, rax
0000000000041d61 mov rsi, qword [0x4a2998] ; argument "selector" for method _objc_msgSend, @selector(length)
0000000000041d68 mov rdi, rbx ; argument "instance" for method _objc_msgSend
0000000000041d6b call r15 ; Jumps to 0x6d63c0 (_objc_msgSend), _objc_msgSend
0000000000041d6e test rax, rax
0000000000041d71 je loc_41ca7
0000000000041d77 mov rax, qword [_kIOMasterPortDefault_3c7980] ; _kIOMasterPortDefault_3c7980
0000000000041d7e mov r14d, dword [rax]
0000000000041d81 mov rdi, rbx ; argument "instance" for method _objc_msgSend
0000000000041d84 mov rsi, r12 ; argument "selector" for method _objc_msgSend
0000000000041d87 call qword [_objc_msgSend_3c7a08] ; _objc_msgSend, _objc_msgSend_3c7a08,_objc_msgSend
0000000000041d8d xor r12d, r12d
0000000000041d90 xor esi, esi ; argument "options" for method imp___stubs__IOBSDNameMatching
0000000000041d92 mov edi, r14d ; argument "masterPort" for method imp___stubs__IOBSDNameMatching
0000000000041d95 mov rdx, rax ; argument "bsdName" for method imp___stubs__IOBSDNameMatching
0000000000041d98 call imp___stubs__IOBSDNameMatching ; IOBSDNameMatching
0000000000041d9d test rax, rax
0000000000041da0 je loc_41f14
0000000000041da6 mov edi, r14d ; argument "masterPort" for method imp___stubs__IOServiceGetMatchingService
0000000000041da9 mov rsi, rax ; argument "matching" for method imp___stubs__IOServiceGetMatchingService
0000000000041dac call imp___stubs__IOServiceGetMatchingService ; IOServiceGetMatchingService
0000000000041db1 mov r14d, eax
0000000000041db4 test r14d, r14d
0000000000041db7 je loc_41ecd
0000000000041dbd lea rsi, qword [aIoservice] ; argument "plane" for method imp___stubs__IORegistryEntrySearchCFProperty, "IOService"
0000000000041dc4 lea rdx, qword [cfstring_Protocol_Characteristics] ; argument "key" for method imp___stubs__IORegistryEntrySearchCFProperty, @"Protocol Characteristics"
0000000000041dcb xor r12d, r12d
0000000000041dce xor ecx, ecx ; argument "allocator" for method imp___stubs__IORegistryEntrySearchCFProperty
0000000000041dd0 mov r8d, 0x3 ; argument "options" for method imp___stubs__IORegistryEntrySearchCFProperty
0000000000041dd6 mov edi, r14d ; argument "entry" for method imp___stubs__IORegistryEntrySearchCFProperty
0000000000041dd9 call imp___stubs__IORegistryEntrySearchCFProperty ; IORegistryEntrySearchCFProperty
0000000000041dde test rax, rax
0000000000041de1 je loc_41f0c
0000000000041de7 lea rsi, qword [cfstring_Physical_Interconnect_Location] ; argument "key" for method imp___stubs__CFDictionaryGetValue, @"Physical Interconnect Location"
0000000000041dee mov qword [rbp+var_1150], rax
0000000000041df5 mov rdi, rax ; argument "theDict" for method imp___stubs__CFDictionaryGetValue
0000000000041df8 call imp___stubs__CFDictionaryGetValue ; CFDictionaryGetValue
0000000000041dfd mov rbx, rax
0000000000041e00 test rbx, rbx
0000000000041e03 je loc_41ed2
0000000000041e09 lea rsi, qword [cfstring_Internal] ; argument "theString2" for method imp___stubs__CFStringCompare, @"Internal"
0000000000041e10 xor edx, edx ; argument "compareOptions" for method imp___stubs__CFStringCompare
0000000000041e12 mov rdi, rbx ; argument "theString1" for method imp___stubs__CFStringCompare
0000000000041e15 call imp___stubs__CFStringCompare ; CFStringCompare
0000000000041e1a test rax, rax
0000000000041e1d je loc_41ede
0000000000041e23 lea rsi, qword [cfstring_File] ; argument "theString2" for method imp___stubs__CFStringCompare, @"File"
0000000000041e2a xor r12d, r12d
0000000000041e2d xor edx, edx ; argument "compareOptions" for method imp___stubs__CFStringCompare
0000000000041e2f mov rdi, rbx ; argument "theString1" for method imp___stubs__CFStringCompare
0000000000041e32 call imp___stubs__CFStringCompare ; CFStringCompare
0000000000041e37 test rax, rax
0000000000041e3a mov rbx, qword [rbp+var_1150]
0000000000041e41 jne loc_41f04
0000000000041e47 lea rsi, qword [cfstring_Virtual_Interface_Location_Path] ; argument "key" for method imp___stubs__CFDictionaryGetValue, @"Virtual Interface Location Path"
0000000000041e4e mov rdi, rbx ; argument "theDict" for method imp___stubs__CFDictionaryGetValue
0000000000041e51 call imp___stubs__CFDictionaryGetValue ; CFDictionaryGetValue
0000000000041e56 mov rbx, rax
0000000000041e59 test rbx, rbx
0000000000041e5c je loc_41ed2
0000000000041e5e mov rdi, qword [objc_cls_ref_NSString] ; argument "instance" for method _objc_msgSend, objc_cls_ref_NSString
0000000000041e65 mov rsi, qword [0x4a25a0] ; argument "selector" for method _objc_msgSend, @selector(alloc)
0000000000041e6c call r15 ; Jumps to 0x6d63c0 (_objc_msgSend), _objc_msgSend
0000000000041e6f mov rsi, qword [0x4a2a40] ; argument "selector" for method _objc_msgSend, @selector(initWithData:encoding:)
0000000000041e76 mov ecx, 0x4
0000000000041e7b mov rdi, rax ; argument "instance" for method _objc_msgSend
0000000000041e7e mov rdx, rbx
0000000000041e81 call r15 ; Jumps to 0x6d63c0 (_objc_msgSend), _objc_msgSend
0000000000041e84 mov rbx, rax
0000000000041e87 mov rdi, rbx ; argument "instance" for method _objc_msgSend
0000000000041e8a mov rsi, qword [0x4a2998] ; argument "selector" for method _objc_msgSend, @selector(length)
0000000000041e91 call r15 ; Jumps to 0x6d63c0 (_objc_msgSend), _objc_msgSend
0000000000041e94 test rax, rax
0000000000041e97 je loc_41eea
0000000000041e99 mov rdi, qword [objc_cls_ref_NSFileWrapper] ; argument "instance" for method _objc_msgSend, objc_cls_ref_NSFileWrapper
0000000000041ea0 mov rsi, qword [0x4a4380] ; argument "selector" for method _objc_msgSend, @selector(_canSafelyMapFilesAtPath:)
0000000000041ea7 mov rdx, rbx
0000000000041eaa call qword [_objc_msgSend_3c7a08] ; _objc_msgSend, _objc_msgSend_3c7a08,_objc_msgSend
0000000000041eb0 mov r12b, al
0000000000041eb3 jmp loc_41eed
loc_41eb5:
0000000000041eb5 lea rdi, qword [_volumeIsSafeForMapping.lock] ; argument "lock" for method imp___stubs__os_unfair_lock_unlock, _volumeIsSafeForMapping.lock, CODE XREF=+[NSFileWrapper _canSafelyMapFilesAtPath:]+159
0000000000041ebc call imp___stubs__os_unfair_lock_unlock ; os_unfair_lock_unlock
0000000000041ec1 mov r12b, byte [__prepareForDispatch.installedPreDispatchHandler+4104] ; 0x4c4b68
0000000000041ec8 jmp loc_41f6f
loc_41ecd:
0000000000041ecd xor r12d, r12d ; CODE XREF=+[NSFileWrapper _canSafelyMapFilesAtPath:]+347
0000000000041ed0 jmp loc_41f14
loc_41ed2:
0000000000041ed2 xor r12d, r12d ; CODE XREF=+[NSFileWrapper _canSafelyMapFilesAtPath:]+423, +[NSFileWrapper _canSafelyMapFilesAtPath:]+512
0000000000041ed5 mov rbx, qword [rbp+var_1150]
0000000000041edc jmp loc_41f04
loc_41ede:
0000000000041ede mov r12b, 0x1 ; CODE XREF=+[NSFileWrapper _canSafelyMapFilesAtPath:]+449
0000000000041ee1 mov rbx, qword [rbp+var_1150]
0000000000041ee8 jmp loc_41f04
loc_41eea:
0000000000041eea xor r12d, r12d ; CODE XREF=+[NSFileWrapper _canSafelyMapFilesAtPath:]+571
loc_41eed:
0000000000041eed mov rdi, rbx ; argument "instance" for method _objc_msgSend, CODE XREF=+[NSFileWrapper _canSafelyMapFilesAtPath:]+599
0000000000041ef0 mov rbx, qword [rbp+var_1150]
0000000000041ef7 mov rsi, qword [0x4a2520] ; argument "selector" for method _objc_msgSend, @selector(release)
0000000000041efe call qword [_objc_msgSend_3c7a08] ; _objc_msgSend, _objc_msgSend_3c7a08,_objc_msgSend
loc_41f04:
0000000000041f04 mov rdi, rbx ; argument "cf" for method imp___stubs__CFRelease, CODE XREF=+[NSFileWrapper _canSafelyMapFilesAtPath:]+485, +[NSFileWrapper _canSafelyMapFilesAtPath:]+640, +[NSFileWrapper _canSafelyMapFilesAtPath:]+652
0000000000041f07 call imp___stubs__CFRelease ; CFRelease
loc_41f0c:
0000000000041f0c mov edi, r14d ; argument "object" for method imp___stubs__IOObjectRelease, CODE XREF=+[NSFileWrapper _canSafelyMapFilesAtPath:]+389
0000000000041f0f call imp___stubs__IOObjectRelease ; IOObjectRelease
loc_41f14:
0000000000041f14 mov rax, qword [__NSConcreteStackBlock_3c73a8] ; __NSConcreteStackBlock_3c73a8, CODE XREF=+[NSFileWrapper _canSafelyMapFilesAtPath:]+324, +[NSFileWrapper _canSafelyMapFilesAtPath:]+628
0000000000041f1b lea rbx, qword [rbp+var_1128]
0000000000041f22 mov qword [rbx-0x20], rax
0000000000041f26 mov dword [rbx-0x18], 0xc0000000
0000000000041f2d mov dword [rbx-0x14], _OBJC_METACLASS_$_NSURLSession_0
0000000000041f34 lea rax, qword [___volumeIsSafeForMapping_block_invoke] ; ___volumeIsSafeForMapping_block_invoke
0000000000041f3b mov qword [rbx-0x10], rax
0000000000041f3f lea rax, qword [___block_descriptor_tmp.528_3d6008] ; ___block_descriptor_tmp.528_3d6008
0000000000041f46 mov qword [rbx-8], rax
0000000000041f4a lea rsi, qword [rbp+var_8A8] ; argument "src" for method imp___stubs__memcpy
0000000000041f51 mov edx, 0x878 ; argument "n" for method imp___stubs__memcpy
0000000000041f56 mov rdi, rbx ; argument "dst" for method imp___stubs__memcpy
0000000000041f59 call imp___stubs__memcpy ; memcpy
0000000000041f5e mov byte [rbx+0x878], r12b
0000000000041f65 cmp qword [__prepareForDispatch.installedPreDispatchHandler+4112], 0xffffffffffffffff ; 0x4c4b70
0000000000041f6d jne loc_41fc8
loc_41f6f:
0000000000041f6f test r12b, r12b ; CODE XREF=+[NSFileWrapper _canSafelyMapFilesAtPath:]+620, +[NSFileWrapper _canSafelyMapFilesAtPath:]+895
0000000000041f72 je loc_41ca7
0000000000041f78 cmp qword [__prepareForDispatch.installedPreDispatchHandler+4128], 0xffffffffffffffff ; 0x4c4b80
0000000000041f80 jne loc_41fb3
loc_41f82:
0000000000041f82 mov rcx, qword [__prepareForDispatch.installedPreDispatchHandler+4120] ; 0x4c4b78, CODE XREF=+[NSFileWrapper _canSafelyMapFilesAtPath:]+874
0000000000041f89 test rcx, rcx
0000000000041f8c je loc_41ca7
0000000000041f92 lea rbx, qword [rbp+var_1148]
0000000000041f99 mov rdi, r13
0000000000041f9c mov rsi, rbx
0000000000041f9f call rcx
0000000000041fa1 test eax, eax
0000000000041fa3 sete cl
0000000000041fa6 cmp dword [rbx], 0x5
0000000000041fa9 setne al
0000000000041fac and al, cl
0000000000041fae jmp loc_41ca9
loc_41fb3:
0000000000041fb3 lea rdi, qword [__prepareForDispatch.installedPreDispatchHandler+4128] ; argument "predicate" for method imp___stubs__dispatch_once, 0x4c4b80, CODE XREF=+[NSFileWrapper _canSafelyMapFilesAtPath:]+804
0000000000041fba lea rsi, qword [___block_literal_global_3d6048] ; argument "block" for method imp___stubs__dispatch_once, ___block_literal_global_3d6048
0000000000041fc1 call imp___stubs__dispatch_once ; dispatch_once
0000000000041fc6 jmp loc_41f82
loc_41fc8:
0000000000041fc8 lea rdi, qword [__prepareForDispatch.installedPreDispatchHandler+4112] ; argument "predicate" for method imp___stubs__dispatch_once, 0x4c4b70, CODE XREF=+[NSFileWrapper _canSafelyMapFilesAtPath:]+785
0000000000041fcf lea rsi, qword [rbp+var_1148] ; argument "block" for method imp___stubs__dispatch_once
0000000000041fd6 call imp___stubs__dispatch_once ; dispatch_once
0000000000041fdb jmp loc_41f6f
loc_41fdd:
0000000000041fdd call imp___stubs____stack_chk_fail ; __stack_chk_fail, CODE XREF=+[NSFileWrapper _canSafelyMapFilesAtPath:]+91
; endp